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sfdownhill

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Everything posted by sfdownhill

  1. Hey Skids - not to hijack the header thread, but since you’re looking for a 5 gen to put headers on, I can justify proceeding! I have a 2001 with less than 10,000 miles that will be for sale in two months (maybe sooner). It’s all stock except upgraded regulator/rectifier, never crashed or dropped, in pristine condition. PM me if you’d like to continue this conversation.
  2. Thanks for this, Dano, it’s very helpful. We’ve expanded 5 or 6 midpipes now, always done by Wade (the guy who makes our headers) in his shop, and have not had any splits. The commercially manufactured midpipes - Staintune and Yoshimura - had 3 or 4 slots where they fit over the headers. Wade cut slots into the custom midpipes too, and none of them split - not sure if it was the slots, technique, or materials that helped us avoid splits.
  3. Mohawk, that looks like about the lightest sprocket carrier/cush drive I've ever seen. It looks like there's a JT logo on your carrier - is this correct? I'm used to seeing Ducati drive assemblies with an outer flange covering the cush bobbins, with bolts from the bobbins coming through the outer flange and nuts on the bolts holding the outer flange [see vfrcapn's post/photo above yours]. I love your safety wire loop [very tidy] and it appears that the cush bobbins on your assembly have female hex fittings, so I assume they thread into something that transfers drive forces to the carrier, yes? It would be very interesting if you could shed some light. Thanks!
  4. So glad they finally made it Francisco! What an ordeal it was getting USPS and Portuguese customs to coordinate...whew. Keep us apprised of your install and tuning. Cheers! Hi zinsern - there is no telling if it will happen, but will let you know if it does.
  5. Thanks for that info Cogswell. And yikes - my headers don’t have bungs for the OEM O2 sensors. Plus they’re already ceramic coated. Dang. Well, it’s just another of those puzzles we solve when modding our VFRs.
  6. Glad to hear it, ae86andkp61. I’m with you on the RB vs PC - I’m considering going from my current PC3 to RB w MTB when I do velocity stack and airbox mods on my 5 gen. Yaman is the man at RB USA, and there are a number of members here that he’s helped with setting up AFR maps for their RB systems, so that’s a consideration. Cogswell, my understanding is that it’s not so critical to keep the OEM O2 sensors with RB if you’re running MTB. Without MTB, the OEM sensors send O2 sensor readings to RB, which then communicates with the ECU to manage fueling. MTB takes over those duties when installed. What I’m not certain about is whether it’s important to have the RB connected to the OEM O2 sensor connectors going to the wire harness/ECU if you’re running MTB, or if MTB negates the need for OEM O2 sensors altogether. It’s a good question for Yaman at RB USA; as mentioned above, he’s a great resource for assistance when setting up a RB system, with or without MTB.
  7. The only difference between the 5 gen headers and the 6 gen headers is the 6 gens have 5/8” cut off their collector exit pipe to allow the complex 6 gen midpipe/dual muffler assembly to fit. Having just installed a set of 6 gen mufflers on these headers, I’m thinking we should have cut off 3/4”...maybe even 7/8”. Any other 6 gen owners think a little bit shorter collector exit would have been a better fit?
  8. (Laughing) You probably only need to read the first 6 or 8 pages to get the gist.
  9. Thumbs up!! You MUST remove the PAIR system prior to tuning because the PAIR dumps fresh air into the exhaust gases. This causes both onboard O2 sensors and dyno O2 sensors to get an AFR reading that is far leaner than actual. The minimum order is 15. Actually there are a few others interested in the headers, so possibly 6 or 7 including DivisibleRex, but it’s not official that there is a list or another production run happening.
  10. There’s not a waiting list at this time, but we’re keeping track of interested parties and if it the numbers keep increasing, there might be the possibility of another batch.
  11. Nice to see VFR guys helping each other out. vfrcapn, you know this, but for others who may not, it’s the 1998-1999 headers that have larger diameter tubes and no catalytic converter. A fair number of VFR owners have replaced stock skinny-tubed catalytic converter headers on 2000-2009 models with success (they work on 6th gen too). The only downside to the 98-99 headers is that they are mild steel, not stainless.
  12. bit loud just off idle and low RPM, resonating in my helmet a bit but smooths out and much less noticeable after that Less noticeable after that because the decibels just get further and further behind you as you twist your right wrist - ha!
  13. The electrical diagram in the service manual shows that from the harness to the natural color O2 sensor connector is cylinders 1-2 (left rear - left front) From harness to black O2 sensor connector is cylinders 3-4 (right rear - right front)
  14. Are your stock cans hollowed out or ‘gutted’ as some describe it? The tubing inside OEM is crazy constrictive - it consists of multiple very small diameter tubes that reverse the direction of the exhaust gases, passing them back and forth inside the OEM cans. If you haven’t cut out all the plumbing inside the OEM cans and replaced it with straight-through perforated tubes (with packing around the perf tubes), there will be too much back pressure to take advantage of the headers’ performance. Below are some photos of what you see when you cut open OEM 6 gen mufflers. Gases come in through a single inlet pipe and are immediately pushed through a perforated metal plate that is perpendicular to gas travel (A giant flow clogger). Then the gases push through two tubes into the middle chamber, then gases that are too willful to meet Honda engineers’ expectations reverse course through other tubes to circulate at the front of the can, then reverse course again to mix again in the mid chamber with gases that have remained in the middle chamber. Finally it’s all pushed out through the two little exit pipes we are familiar with. Here’s the screen over the inlet pipe way down at the bottom of the can (after all other midsection crap has been removed): Here’s the skinny little inlet pipe after removing the screen: Here are the noodly back and forth tubes in the midsection - now we know why OEM 6 gen mufflers are SO quiet! (Note the perforated sound damping material lining the inner walls of the can): ShipFixer, I’d suggest running the Delk until you find an open flowing slipon assembly with aesthetics that please you. Back pressure is never good with quality headers. Some say back pressure is a necessary component of a tuned exhaust, but the way it was described to me is that the column of gas moving through the exhaust system (Specifically after the final merge/collector) needs to have as little obstruction as possible. In a single muffler system, sometimes a longer canister works better, not because of back pressure, but because the column of moving gas spends a longer time moving through a controlled path, which in some cases allows the timing of exhaust pulses in the merges to be optimized. An example of this is my Aprilia RSV4 - another V4 - on which I had dyno runs done back to back, first with a 300mm long Akrapovic can then with a 420mm long Akrapovic. The cans were identical in all dimensions but length, and the bike put out 1.2 more hp and 2.3ft/lbs more torque with slightly richer fueling on the longer muffler. YMMV.
  15. It’s been a couple years, but on the 8 gen test bike, the O2 sensor in the rear bung didn’t seem as tightly spaced as with your installation Cogswell. I like the 270° turn you put in the cable - that seems to allow a decent routing. Is the bike in the photo your Torocharged 6 gen? That would be a great candidate for the headers.
  16. I use a light application of anti-seize on the studs when installing the headers. ‘Light’ meaning just enough to cover the threads, then wipe off as much of the anti-seize as I can with a gloved finger. With this treatment, no nuts have come loose or frozen in place on our three test bikes in the ~ 2 years since we started this project. Granted, 2 years isn’t much compared to the 16-20 years that some header nuts have been subjected to road spray and contaminants, but I was able to easily remove the headers from my 5 gen recently.
  17. Sounds good Stray - glad it’s working out. You are correct about the front two cylinders’ pipes being a pain in the buttocks to fit. It turns out that the original Two Brothers headers we copied were bent...dang. At the time the fixtures were built for 5/6 gen in 2018, the last thing on our minds was cutting up one of the last known ‘magic TBR headers’ in captivity to correct their alignment.
  18. Hey Stray - glad to see Mr Squiggle might be able to hook you up with a set of headers. You were instrumental early in the process of getting the headers started - I remember you did a lot of work with the importer of Lextek headers, and you and I had a couple good talks during the process. Cheers mate!
  19. Cool pipes - the curly-cues on the rear primaries are indeed interesting. I think our headers merge left-front-to-left-rear and right front-to-right-rear like the ones in the photo. It looks like the headers in the photo might be missing the last curves to get the front pipes to meet the cylinders...not sure. PM received and responded. Your question is a good one. Maybe someone who is going to have their bike dyno tuned [Tirso? Other owner of WiLD headers?] can have a baseline dyno run done with the Attack map before tuning their own custom map? That would be an effective apples-to-apples comparison.
  20. Actually, I left a fair bit of melted heel material from my near-new Dianese Goretex touring boots on the vertical exhaust tube when I took it out for a spin before fitting a heat shield. Right heel started feeling a bit warm in a long sweeping left turn, then got HOT. Cleaning fully baked-on boot heel off the midpipe was no fun.
  21. Just 8 gens need O2 sensor cable extensions as described by Mad Doc in the previous post.
  22. I would send you a link to the exact O2 sensor extension cable I purchased on ebay to extend our 8 gen test bike’s cable, but that seller no longer offers the item. Other sellers do, though, but you’ll have to check the photos carefully and compare connectors with the ebay listing photos. I can tell you that the first cable I purchased was described as for Acura and looked correct at first glance, but had a slightly different connector. The cable that worked was described as being for a Honda Civic, and the photos in the listing showed that the connector was an exact match for the 8 gen harness connector.
  23. That aluminium center stand is an awesome idea! You have mad fabricating skills!
  24. Yes, the collector exit has a larger diameter than OEM. We decided to keep the dimensions of the original Two Brothers headers because they are a proven performance benchmark. It’s cool that you are welding-proficient, as those of us without welding skills have had to take our midpipes to a local exhaust/muffler shop and have them expanded (swedged?) to fit the new headers. If you have your midpipe expanded, make sure the tech doing the expansion does it in 3-4 small increments so it doesn’t split at the slots in the clamping area.
  25. Sounds good. Mohawk is definitely a knowledgeable source - he has been invaluable to us throughout the header project. He’s got a very fast, very light 5 gen too...
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