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It Is Now Time For Some Serious Modifications...


toro1

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It's official -- Supercharger Kits are finally here.

See post #113 for details, and be sure to visit www.aaperf.com for pictures, videos, and tons of information, including pricing.

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T H E

B U I L D U P

Background Info

The following is a condensed version of the original 30 page, 889 reply thread of the same name. The amount of feedback and quality of discussion that took place was incredible for all those involved, but, unfortunately, made it very difficult to follow the buildup. Therefore, only the key steps remain - along with pictures and dyno results - with some video highlights linked here:

> First startup video

> Blower video

>

Dyno Results:

> Dyno Pull #1

> Dyno Pull #2 (N/A Bike Comparison)

-- begin thread --

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rotrex.jpg Yes, it's a supercharger. Yes, it's going on my VFR.

And yes, it fits.

This story begins at the end of last year. Heading out for one last good ride of the season, I pull out of my driveway, wave hi to the neighbors, look for oncoming traffic at the stop sign, and look back straight again, only to become blinded by the setting sun. When I finally realize where the road is, I am happily greeted by the curb and end up dumping the bike right there in the street, effectively destroying months of hard work and the right side of the bike. You can see pre-crash pictures here.

Completely disgusted by my utter stupidity, I put the bike out of sight & mind for a week, but my inner hot rodder doesn't stay quiet for long. I realize that because of the crash, I can do some things differently than I did before -- tweak the bodywork a bit more, build a custom exhaust, and most importantly, if I have to take all the body panels off again, why not add one of these:

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it_fits.jpg

Thought I'd add a few new pics. If anyone has ever wondered what's behind your clutch cover, here ya go.

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inside_case.jpg

The connector will bolt right where the "12" bolt rests and proceed out the timing cover (which will be modified to house a sealed bearing).

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no_airbox.jpg

The image above is what everything looks like with the airbox removed. The emission controls and most of the vacuum tubes will be gone before long. Now to get those injectors out...

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basic_initial_mockup.jpg

Finally, here's a shot of a very basic bracket mockup, a pre-beta bracket if you will. I'll refine it with some thicker material (particle board maybe?) before coming up with a CAD drawing of the final aluminum piece.

By the way, if anyone does not yet own an official Honda shop manual, I highly recommend buying one :thumbsup:

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Thanks for the warm welcome guys.

Matt - that is indeed photoshopped. I seriously considered chopping the tail & changing the suspension (and still do), but I'd rather have more go than show, so right now, those mods are on the back burner. I am however making a custom exhaust, but unlike that picture, it will be a muffled reverse cone, so it should be much quieter and fit the lines of the bike (and stock tail section) better than the slash cut. Very scientific testing has taught me that a VFR sounds better muffled than not...

I'm definitely looking forward to the stealth element the Rotrex will provide. Due to the internal design (it uses a planetary roller friction drive, not gears), it will be nearly silent while operating, and is also very efficient. The model I have can spin up to 150,000 RPM! Since it's centrifugal, the power delivery will be very easy on the drivetrain and very controllable with the wrist, and I'm looking to get a realistic 140-150 RWHP out of it when I'm done.

I'll keep you guys posted with my progress. I've learned a tremendous amount of information so far, and can't wait to get this thing back on the road.

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I realized that the next step to getting everything properly lined up, and getting some good brackets designed, was to rigidly align the blower with the crank. I figured out where the rotrex could be nestled, determined the center-to-center distance, drilled a piece of extruded aluminum, and bolted everything together (with the proper spacing, of course). Here's what it looks like:

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mockup2.jpg

The question becomes, is there any way to get the radiator to fit behind the belt?

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Yes, but it's gonna be tricky. The tougher part is going to be getting the radiator to fit around the blower itself, and running the coolant hoses such that they do not interfere with the drive or the supercharger intake & air filter.

Actually, the toughest part of this whole project has been making everything work without modifying (read: hacking off, grinding away, or welding onto) existing parts and/or the frame. I want this kit to be built so that if I ever need to go back to stock, nothing will be stopping me.

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Okay, time for some updates. I've got the crank interconnect and pulleys all designed, and they should be well underway by next week. I'm having my dad's shop cut the teeth and splines, so the price should be right :D

Here are some shots of new items that have arrived. First up is the belt and bearing.

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Not too exciting, but another step closer nonetheless. Also, I mentioned earlier that I was having a custom exhaust made, and guess what arrived yesterday...

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The reverse cone muffler is the end piece of the exhaust. The first part consists of a stock VFR exhaust pipe cut at the muffler section and stuffed with a Car Chemistry 3-disk insert. To say the sound is awesome is a huge understatement, and it's completely unlike any VFR I've ever heard. I had Doug up at ARC Fabrication make it custom for me from a drawing I gave him. His work is awesome and his prices are great. Really nice guy, too. The pictures don't do it justice, it really looks like a factory race part when you see it in person.

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When I found out the injectors I bought weren't exactly drop-in replacements for the VFR units, I was faced with 2 choices: 1) modify the throttle body to accept the RCs, or 2) modify the RCs to accept the throttle body.

Here's what I chose to do:

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To make these injectors fit the throttle body required taking some material off the body and snout of each injector. So, I made a split collar that fit the injectors perfectly, then chucked them up in the lathe and took the ODs down to the right size.

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You can see in the above shot a before & after. Don't worry, there's still plenty of material left on there for the injectors to function normally.

I wasn't done yet. The RC injectors are actually longer than the stockers too, so spacers needed to be made for both the injectors and the fuel rail.

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modded_injectors.jpg

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In case you are wondering, raising the fuel rails altered the center distance of the stock connector between the two rails, so to fix that, I found a round piece of steel with the proper radius, placed the connector on top of that, and inserted both items into the press. Very carefully, the connector was worked to fit the new center distance.

Hopefully the pigtail adapters will be here shortly so I can button up the throttle body once and for all. And of course, more updates to come...

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I got the pigtails, and of course, they aren't exactly plug and play. The female end fits the RCs perfectly, but the male end is slightly different than the stock Honda injector plug. After some research, I've only managed to find one place that sells the exact pigtails that I need, but they cost 4x the amount I paid!

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So, I found that by trimming some of the plastic off the plug end, they can be directly connected to the original wiring harness. I did that on all 4 pigtails, plugged them in, ziptied them up, and now the throttle body is complete.

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complete_throttle_body.jpg

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I've been quite busy this past week making drawings of all the different parts I need to get machined. So far, I've designed & drawn up 6 separate components (with the help of good 'ole AutoCAD) and still need to design & draw up at least that many more, and let me tell you, with no easy access to a CMM machine, some of these parts are -t e d i o u s- to figure out. My goal of not chopping/modifying the existing hardware/frame/components has made this project tricky indeed, and my self-imposed deadline of June 1st is fast approaching. But hey, I wanted a challenge :D

I can give you guys some more pictures of freshly arrived items. First up is my non-bling, super low cost blow-off valve. It's a Bosch unit I picked up on ebay for a princely sum of $25. Originally off a Porsche Turbo, it should be more than up to the task of venting excess pressure on my low-boost VFR. I could have gone with a billet adjustable unit, but from what I've read, this valve has lightning fast response, and since I don't care about being able to hold 25+psi, I might as well save $150. I've also got an old K&N breather filter that fits perfectly on the outlet, and should quiet down the 'pssssht' slightly.

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BOV.jpg

Also, I can give you a sneak peak at the intake I'll be making.

I bought some mandrel bent aluminum tubes which will form the the runner legs and directly connect the throttle body with the plenum.

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mock_intake.jpg

No, I'm not building a tunnel ram, I just have the tubes sitting in the throttle body for some pre-visualization. Try to imagine the legs much shorter coming out of the throttle body, making a 90, then entering into a central plenum which is fed directly by the supercharger. Wait till you see how I mount the intake to the throttle body -- it's gonna be pretty slick. I'll get cracking on this once I get the brackets machined and I can mount the blower.

Alright, now I literally have to go back to the drawing board...

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While I'm waiting for some parts to be completed, I thought I'd share a little bit of progress. Since I have the clutch cover pulled off, I decided to upgrade the stock springs to Barnett units. The plates are in excellent condition, and from what I've read, the hot ticket clutch setup is the factory plates with these springs, so hopefully it'll stand up to the extra power. The Barnetts are longer and a little stiffer than the stockers, and once installed, the clutch lever has a nice firm feel to it (not far from stock, actually).

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I also got the pump in. It's a Walbro unit with the same connector style and inlet & outlet location as the Denso unit. Hard to tell from the picture below, but the body diameter is ever-so-slightly larger than stock.

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This was the easiest mod so far -- truly a plug and play deal. The only finagling required was due to the aforementioned pump body being larger than stock. I simply took a set of needlenose pliers, squeezed the clamp together (which contoured the metal band around the pump) and put the screw in. Done. I already powered it up and it sounds great -- I can't wait 'till it's pumping massive amounts of fuel to those hungry cylinders :thumbsup:

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completed_pump.jpg

Can't even tell it's not stock!

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I thought I'd start mocking up the intake today, and the quickest way to do that is with a nice piece of cardboard:

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dual_view_o_intake.jpg

I cut the pipes down the shop and made sure that the ends sticking in the throttle body are all square & of equal length (I left the other end longer for the time being). I know what size plenum I want to run and have actually made a detailed drawing, but detailed drawings don't mean squat without seeing the part in real life. So, I cut a piece of cardboard into close-enough dimensions for mockup, and I'm proud to report that clearance wise, it's all good.

What I'm pondering now is whether to have a top entrance to the plenum or a side feed entrance. There is actually more room on the side with the blower (due to the engine being offset with the cam drive), about 3 inches worth from the end of the plenum to the inside of the frame. You can see what I mean below:

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intake_overhead.jpg

What's bugging me now is the best way to go about plumbing the rotrex to the intake, and where to put the BOV. It's gonna be a tight turn into the intake from the top or the side, and will require a few 45º angles to make it work. I had planned on using a nice silicone T hose to mount the BOV, but I don't think there's room for that anymore. I'll figure it out later...

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Hot off the CNC -- parts baby!

I said earlier that I had a slick way to mount the new intake to the throttle body, and here it is:

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throttle_body_plates.jpg

The intake runner tubes will be a tight slip fit through the holes of the throttle body mounting plates & will bottom against a small lip in the throttle body. These plates are held down the same way the stock airbox is, with (2) M5 bolts around each runner. How does it seal, you ask?

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Machined into the base are grooves for properly sized Viton o-rings, so no rubber/silicone connectors & hose clamps are needed to hold the plenum to the throttle body, just the 8 socket head cap screws.

I'm still undecided whether I should weld the tubes in or use special aluminum epoxy. I'm afraid that if I weld it, the base will distort slightly and compromise the seal, so I'm really investigating the epoxy. After all, Lotus epoxies their entire cars together (welding aluminum can reduce strength around the weld by up to 50%), and with thin wall tubing, it might just be the ticket.

I also got the PAIR blockoff plates. I designed them to accept flathead cap screws since I need every thousandth near the intake of the blower. Nothing fancy, but they'll get the job done.

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PAIR_cover.jpg

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Believe it or not, this used to be the timing cover:

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timing_cover_front.jpg

This mod required some thought to accomplish, but it turned out great. The bearing needed to be prefectly centered in the cover in order to avoid improper loading of the crankshaft, and believe me, it's perfectly centered.

The two small holes are for a spanner wrench that will tighten the cover back down (since the original hex is now long gone).

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timing_cover_back.jpg

It's a slight press fit into the cover, and the double seal assures that no oil can escape from the crankcase.

Edited by toro1
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After all this talk of epoxy and welding, I have made a decision that if I ever have to make another manifold, it definitely will have silicone bends with separate adapters. I already know exactly how I want to do it; more expensive - yes, more parts - yes, not as nice looking - yes, much much easier to build - YES. It took me hours to hand work those bends back into round & to cut them the exact length and perfectly square.

I also am pretty certain that I will weld the whole assembly together. There's one more place I want to call about the epoxy, but I have found a very capable welder that can do the job for me. Either way, this is the last all aluminum intake manifold I'll make.

Having said all this, here's what I got accomplished this weekend. First, I needed to cut the plenum material and mill holes where the runners will attach.

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I then used a flycutter to finish bore the holes and counterbore them 0.050" to allow the tubes to locate in the plenum.

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The reason I went with 1/4" wall square tube is so that I could add a full size radius on the inside of the plenum without having to make a separate component. To add the radiused entry, I ground a radius into a piece of tool steel, mounted it into the flycutter, and then cut from the underside until the radius was generated:

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It worked out great -- here are some pics of the semi-completed intake.

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intake_view2.jpg

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intake_view3.jpg

I still have to make the endcaps, drill it for the temp sensor, and radius the edges, but it's getting close.

Edited by toro1
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This is starting to get fun. After all the measurements and mockup brackets, I finally have a real supercharger bracket, and get this -- it puts the blower right where I wanted it! It's almost like I engineered it that way!

Joking aside, here's a pic:

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rotrex_bracket.jpg

I had it made out of 3/8" thick 7075, so it's plenty strong & still lightweight. I just need to make standoffs, the upper bracket, and the left connector bracket and the whole assembly can be mounted up for good.

Edited by toro1
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  • 2 weeks later...
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Well, the next step in this project is to get the brackets finalized, but I can't do that until I know the final position of the supercharger, which I won't know until I get the pulleys mounted, and since I don't have the pulleys, I'm at a standstill. I've also found out that the silicone pieces I need for the intake won't be in for 2 weeks, so there goes any shot at my June 1st deadline.

Anyhoo, I've started to wire in the Wideband Commander, I'm finishing the exhaust, and today, I got the crank connector all finished up:

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crank_connector.jpg

It mounts right into the end of the crank and right on top of the pulse generator disc.

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Here you can see it sticking out of the clutch cover & modified timing cover. It fits perfectly.

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connector&case.jpg

The driver pulley will be splined to fit onto the connector & will be held on by a bolt in the end.

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Yes folks, the pulleys are done! Things should start moving faster now...

Here they are as blanks:

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pulley_blanks.jpg

They then were popped into the shaper and both the internal & external splines were cut:

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The completed parts.

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I should be able to finalize the bracketry now and get the radiator fitted. Plus, I'll be able to figure out exactly where the bodywork needs to be trimmed/clearanced/heated & bent into shape to fit the drive assembly behind the plastic. As for the pulleys themselves, once I'm done with the test-fitting, they will be sent down to get hard anodized and the flanges will be installed.

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So how do you extend a VFR swingarm?? :goofy:

You could throw a Honda Civic wheel on there with a slick tire though, and see what it'll do at the strip... :rolleyes:

Hey Seb, you mean like this?

:salesman:

gallery_11118_2864_87531.jpg

Drag_vfr.jpg

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Those pulleys look great. Next big thing I'm waiting for is to see the drive belt running from the crankcase cover to the blower... and how you're going to work the plastics around it.

Your wish is my command...

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pulleys_mocked_up.jpg

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Now for the fairing pics:

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inside_bodywork.jpg

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peeking_through_side2.jpg

As you can see, there's not a whole lot of room for the belt or pulleys, but most of it can be fixed by spacing out the fairing & massaging certain parts. It's hard to tell from the pictures, but the belt and pulleys are right up against the plastic. Some sections will have to go under the knife (aka dremel).

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I just wanted to figure out where I want the gauges. I'm liking this position from both an aesthetic & turning clearance point of view.

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The view from up front. Plenty of cold air coming through there, plus the radiator hoses clear both the filter and the blower. I'll mount the oil cooler just below the blower, though I'm still not sure whether to reuse the old one or get a new one.

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Just to clarify an earlier statement I made, check out this picture:

gallery_11118_2864_41135.jpg

belt_rad_clearance.jpg

Pay no attention to that bolt sticking out the end -- it's only temporary. Anyway, you can clearly see there's a good 3/4" of space between the radiator and the belt, and the radiator is even spaced out from the engine a bit, so there should be no clearance issues.

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  • 2 weeks later...
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Fuel economy will suffer...But who cares! :thumbsup:

Thank you Rob!

Here's the upper bracket, just off the machine. This part bolts where the oil cooler bracket used to reside & will very rigidly tie-in and locate the top of the supercharger bracket.

gallery_11118_2864_55618.jpg

upper_bracket.jpg

It's actually two parts - I need to get the lower section welded to the top section, but otherwise, it's ready to go.

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  • 2 weeks later...
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The past week has been frustrating. Parts I need still haven't come in, and everything I do seems to take longer than expected. Oh well, I've just got to keep plugging along. Here's what's new:

I figured out where the gauges needed to go, grabbed some sheet aluminum, layed out a design, and cut away:

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gauge_brackets_just_cut.jpg

Brought them back to the house, drilled the top tree, painted everything, and bolted them up:

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gauge_brackets_mounted.jpg

I so badly wanted to have a shot with everything in place, all lit up, but the wiring is insane and I couldn't get it done tonight. I have so many wires going to so many places, it's really hard to keep track of everything -- it's like a jigsaw puzzle figuring out what has to go where and how it all fits together cleanly & properly. A few more hours tomorrow and I should have it done. Wondering what those little holes in the left bracket are for yet?

Now for everybody that was wondering how it was going to be done...

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finished_pulley.jpg

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flanges_inside_view.jpg

I had to get the pulleys hard anodized first. Machining the stainless flanges came next, and they were then heated significantly & dropped on the pulleys. I allowed them to slowly cool back to room temp and shrink onto the pulley, into the machined groove -- they are going nowhere fast. The 20º inside angle is per Gates and should allow smooth tracking even if the pulleys are out of alignment slightly.

Finally, I'll post up some pics of the completed exhaust and O2 sensor.

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O2_hidden_wires.jpg

Hey, where are the wires? There's actually a huge connector hidden behind the foot guard and I was able to thread the rest of the wire through an existing hole in the engine block.

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exhaust_shot.jpg

You have no idea how badly I want to hear this thing roar. It's so close, yet so far away. I still need the radiator bracket machined, I need to make the idler, the intake and upper bracket need to be welded, the intake connector tubing needs to be completed, I've got to remount the coils, yadda yadda yadda, hopefully it won't be too much longer... :blink:

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First off, thank you so much for your kind words Dan -- I take your compliments to heart. To think that I just thought I was a kid souping up his bike...wow. I hope I don't let you down. :blink:

Finally, finally, finally, I got the gauges done. I thought I was going to go crazy on more than one occasion trying to keep everything straight...

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lots_o_wires.jpg

...but I got it figured out.

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gauges_done.jpg

To record data with the Wideband Commander, you simply flip the toggle switch down; the LED I wired in comes on to let you know when you're recording and when you're not. The housing taped to the top is the knock light/shift light -- it will be permanent once I get the bodywork back from paint.

It was too dark to get any good pictures of this setup, but I have to admit, it looks trick in person. What you can't see are the gauge cups that match & blend in with the rest of the bike -- I wanted just the faces to draw attention, and that's what I ended up with.

Here's a final shot in the dark with the gauges lit and the knock light showing red:

gallery_11118_2864_44329.jpg

gauges_all_lit_up.jpg

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And..... we've reached a new low :blink:

:lol:

Hey, people are just excited, right?

Anyway, I figured out the intake (yes Dan, I think your technique worked :thumbsup: ). First, let me show you the original plan:

gallery_11118_2864_54535.jpg

intake_design_1.jpg

As nice as it would be to run the intake along the side, it just isn't happening. You can see here that while it looks like there's room, remember that the silicone 90 is sticking inside the plenum about an inch, so when you put it in its required location, the bend becomes less than ideal. Also, the T-piece, which I thought would simplify things, only made the setup more complicated and crowded. Thus, we look at design #2:

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intake_design_2.jpg

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intake_design_2-2.jpg

It's oh-so-simple -- a silicone 45 will come off the blower (aluminum in picture) and attach to an aluminum 90 (silicone in picture), which then will meet up with a close-radius cast aluminum 90-degree elbow (not pictured) and go straight into the top of the plenum box. Equal air distribution and fewer parts are the results of this revised intake, as well as smooth bends & easy assembly.

The only downside is now I have to weld a nipple onto the aluminum section for the bov, but that's no biggie. Pictured below is where the oil canister and bov will go:

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oil_canister&bov_location.jpg

Hey, it's ready to run! -- okay, maybe only in my mind, but it's starting to resemble a completed bike once again.

gallery_11118_2864_84039.jpg

ready2run...not.jpg

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gallery_11118_2864_81239.jpg

oil_cooler_comparo.jpg

Old cooler on top, new cooler on bottom. Pretty self explanatory, no?

BTW, the new cooler is about half the thickness of the old one.

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  • 2 weeks later...
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The last of the major fabrication is done. All that's left to do is make a few brackets here and there, and put her back together. Take a look see:

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idler_assembly.jpg

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welded_intake.jpg

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intake_tube.jpg

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