Jnimbostratus Street Fighter Project

fj1289 · May 28, 2015, 04:57:12 PM

Maybe the issue is how quickly the boost is building now?

I know just a little about turbos - and no hands on experience, but I do know the challenges that come with working outside the "usual" set of mods and the learning curve and frustration that come with it -- and the dedication to keep pushing past all the "little" issues...

Well done. Keep it up!

jnimbostratus · May 29, 2015, 02:44:39 PM

Thanks for the props fj1289 and everyone else who have given me any between the attention here and on the streetfighter forum it has been easy to stay motivated with all the positive feed back.

Made some progress today, made mounts to "suck" the manifold onto the carbs. Made a world of difference. Not only keeping the manifold mounted but I think the compression may have squeezed out a boost leak somewhere.

One day at a time chipping away at the block

fj1289 · May 30, 2015, 10:23:21 PM

Which street fighter site? CF?

jnimbostratus · May 30, 2015, 11:40:39 PM

That's the one. The only time my posts are different between here and cf are when I'm responding to someone specific. Updates are always verbatim.

jnimbostratus · June 03, 2015, 04:39:15 PM

Finally had nice enough weather to test drive the bike for first time after getting the manifold to stay on with the fuel pressure regulator adjusted with the latest fuel system revision and I am very happy with the results. I keep getting more power out of it but still have hurtin clutch and no second gear.

fj1289 · June 04, 2015, 12:07:11 AM

Yeah - there's no good time to pull the motor and split the cases. Just had to do it on the BattleAxe to replace the starter gear. Made it a quick 2 evening job. Just DO IT!

You ready to go EFI yet?!

jnimbostratus · June 04, 2015, 12:59:15 AM

Ther is no reservations to "Just do it" lol lack of funds for undercutting and parts is what holding me back.

fj1289 · June 04, 2015, 05:51:03 PM

Quote from: jnimbostratus on June 04, 2015, 12:59:15 AM
Ther is no reservations to "Just do it" lol lack of funds for undercutting and parts is what holding me back.

If second is giving you issues now I'd highly encourage you to put the other trans and forks in it now (and baby them a bit until you can get an undercut trans in it). Then get the current setup undercut when funds allow. It is possible to jack up second gear bad enough that undercutting won't clean up the dogs. You may want to get first cut too when you get it done - I've buggered up first on a stock trans I was drag racing on. Don't know if the turbo will stress it enough to cause problems later.

jnimbostratus · June 05, 2015, 10:55:04 AM

The trans that is in it currently I believe to be beyond repair already. That's why I plan to just undercut the spare before it go's in. I just don't touch the throttle till third gear right now.

fj1289 · June 05, 2015, 11:08:33 AM

understand - no worries - I'm just eager to see you be able to really get on it!

When you're ready, I'd talk with Randy. I think he has a deal worked out with Fast by Gast in NY-- they do excellent work - I've had two transmissions done by them.

jnimbostratus · June 09, 2015, 12:18:17 PM

Been tweaking and tuning here is a first gear launch for your enjoyment. I can't get enough of that sound. I don't get to hear that on the bike I just hear exhaust and wind mostly

Fj1100 turbo launch: https://youtu.be/F0BksK_6zcg

jnimbostratus · June 13, 2015, 06:59:51 AM

Internet must be broken, I thought that video would have gotten Some kind of response.

The more I look at this used trans sitting on the bench the more I believe it has been undercut but only one gear. Does anyone have pictures before and after cutting of their tranny.or even just after.

ct7088 · June 13, 2015, 07:20:57 AM

The people most active in responding are recovering from some high mileage touring and trying to catch up on their various chores. The rally's would have been fun. When your project is all complete is your objective top speed, quarter mile times or road racing? I've wondered how stable the FJ is at high speed without the faring. Not being able to finish a project is always a major irritation. Thanks for allowing us to watch your progress.

Chris

jnimbostratus · June 13, 2015, 11:58:40 AM

Do to the way I clocked the turbo housings I was not able to use the turbo mounted waste gate actuator bracket so I made a bracket mounted off the subframe. It turns out that bracket has a little more flex in it then I expected. So I screwed in the actuator rod end until it would only mount the waste gate flapper arm when I pushed the actuator mount to its fully "flexed" point. This made a huge difference. I must have been mildly bleeding exhaust out the waste gate this whole time. The turbo spools much lower in the revs now but the clutch slips much worse now also tho. Now the bike blows off harder on the 2step set at 3000 rpm then it did before set at 6000 rpm. Now I really can't wait to see what this beast will do with a clutch and second gear.

And to answer your question ct7088 I want to do it all. Mostly because I was told I couldn't. But really I just want it to be the hooligan I know it will be. Go drifting down main street in the morning then throw a slick on the rear and run 9s come sundown at the strip. I don't expect it to do to well on a circuit course but I damn sure going to go and find out.

copper · June 13, 2015, 01:38:08 PM

Probably the best person to talk to is Randy, he has transmissions in stock. I think Yamaha undercut some of the gears but not all of them

http://rpmracingca.com/proddetail.asp?prod=UCT

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Jnimbostratus Street Fighter Project