jeremy77

Did we lose our guinea pig? After a job change and life craziness I think I'm back on the path to get working on the vfr again.

Those computer fans are not going to be waterproof. That's a problem.

Just put them in zip loc bags... that should work!

On my 4th gen, the bolts that hold the subframe to the frame have unusually long hex heads on them. I just put one of them in my 13mm combination wrench and used it like a 13mm allen key.

Is that 68 bucks for one or for both?

Regardless, a motorcycle wheel may or may not spin at 2200 RPM at the furthest point in its diameter. I don't want to do the math or eat pie this early in the morning, but I bet that at the race, it spins MUCH slower. Even if it did spin at 2200 rpm, I'd still say that it's one of those mods you would do for your own pleasure, knowing full well that there is not going to be any practical gain.

Not to be too picky... but RPMs do not take diameter into account. it's Revolutions Per Minute, which is how many times the same point on the wheel passes a fixed point. From the inside of the wheel bearings to the outside of the tire, the RPMs are the same.

That being said, While ceramic sounds cool those are like 5x the price of regular bearings. Can't imagine you get 5x the performance.

good tip... thanks!

So Seb... When are we gonna see a build thread for that highly modified 4th gen?

Any thoughts on how removing the fan will affect the vfr under normal conditions?

Every Denso 2 pin COP uses the same connector as far as I know.

Looks like this eBay item confirms this statement:

http://www.ebay.com/itm/Denso-Pencil-Coil-Connector-Set-CBR-GSXR-Hayabusa-/280641084845

It'll be a month or so before my girl is even back in one piece... So not me.

I just ordered these off of eBay for $24... Off an 03 GSXR with 12,000 miles. I guess I need to get some connectors next.

Thanks, Canuck!!!

As far as i can tell, between ALL the coils there are long ones (f4i) and short ones (suzuki, cbr600rr). 3rd/4th gen need short ones.

So do we have a consensus on what we think will work best for the 4th Gen VFR?

Hello, I am interested in upgrading my bike's ignition system. I have previously installed your products on another of my Honda bikes.

I am unsure if any of your products fit my 1996 VFR750F application. This bike has a 4 cylinder engine, and it uses 4 ignition coils which have a primary resistance of 3.2 ohms.

Please tell me which of your coil products would fit my needs.

Thank you,

You asked someone who might know the answer?!?! What are we gonna speculate about if we get a definitive answer??

I kid, I kid... Good work.

Heathens?

As a church minister, I approve of this sarcastic question!!!

So we'd need two converter boxes to run four COPs. Not sure that's going to save any space.

You gotta do what works for you... They look like they came that way.

First of all, no fair consulting someone who actually know what they're talking about!

The one thing that truly determines if there is any benefit or risk to this mod, is the IMPEDANCE VALUE of the coil.

so it seems, according to this, the we are in need of a 3.2 ohm COP if this is gonna work... Back to the googlery

Or are we now talking about something in the range of 10,000-20,000 ohms? I've seen coils listed as either 3 ohms or 15,000 ohms

Sorry... I was picturing the tiny little resistors you get at Radio Shack.

So a resistor such as, wired between the + side of each coil and the ECM... Probably mounted to the frame to serve as a heat sink?

Another piece to consider is that a used ECM is available on eBay for $40-60. So add to that a set of CBR coil on plugs and you're looking at about $100 to try this plus time. So its not tons of money but a hundred bucks is a hundred bucks.

So I'm not sure about just adding a resistor to the chain to increase the coil resistance. It seems to me that the coil itself needs to provide the resistance. But I'm no electrical wiz...

That being said I have spent the last half hour trying to hunt down a COP with 3+ ohms on the interwebs and have come up dry all the way around. Has anyone else found any COPs with more than 1.6 ohms?

I didn't see anything written about resistance of the stock RC51 coils in that thread(kinda skimmed throught it), but Thorsten Durbahn mentioned on one page that the RC51 and RC30 use a CDI box instead of a TCI like our VFR's do.

In the meantime, if you look at a 4th gen ignition wiring diagram, you'll see two wires going to each coil. One wire is switched ignition, the other is the "ground" circuit which is controlled by the ignition driver in the TCI.

So our VFRs have a CDI or TCI ignition system? Or does it vary by generation?

So the problem with the COP on a CDI system is that the COP does not have the required capacitor to hold the charge that fires the spark? I'm assuming this because of the size difference between the stock ignition coils for the VFR and the COP.

I just did a quick read of what a CDI system is here: http://en.wikipedia.org/wiki/Capacitor_discharge_ignition

I'm still trying to learn what all of this means... forgive the basic questions.

Yeah, but I think Jeremy was asking if it were possible to use a two coil waste spark setup like the one you posted a picture of to eliminate two of the factory coils.

That's correct. The idea of either eliminating half the coils or moving the coils to the plug should appeal to the Streetfighter guys as we try to eliminate clutter that is normally hidden under fairings... b/c we don't have fairings.

I think I would prefer to do a nice COP mod, if that's an option, because it should keep the factory timing and power consumption... I think.

I'm still learning about all this stuff... I love VFRD because there is so much knowledge being shared and lots of collaboration between members.

Some other notes for everyone's benefit...

The blue wire fires the coil going to 1/4. The yellow wire fires the coil going to 2/3. The black/white wire provides the switched 12volts +.

There is no real polarity on the coils. Just a black/white and a color to each.

The one plug fires positive the other negative. So interchanging the location on the coil just interchanges which plug is firing positive.

You can wire it whatever makes the wires "reach" best. Coil location on the bike whatever is unimportant. Blue is 1/4,yellow is 2/3,is the only important info.

so implementing this setup (which I think is a late 90's CBR600 setup would convert the 4 coil system on a 4th gen to a 2 coil, wasted spark system, essentially doubling the number of sparks in each cylinder per revolution?

This could be really useful for those of us fightering our VFRs to reduce the number of coils to relocate. Of course figuring out the COP option would be even better.

Great stuff!!!

+1