Whatever speed you need to be at to hit boost. You'll be able to tell right away if it's slipping or not. It might be hard because you'll probably need to hit your peak torque. I'd say start at like 2600RPM and let the boost build up. Once the turbo spools up, the torque will kick in and if the clutch can't handle it, it will slip.

And that's why I said I won't be held responsible if you get pulled over

 

sometimes its where you shift. Hit the gas easier but shift higher in the band. That way the rpms are high and you end up shifting in the sweet spot instead of lower where it will tend to buck.

 

maybe 55ish

 

i shift at 7200 cuz my redline is at 7300.. i just went and recreated the scenario.. 3rd gear pull, shifted at 7200, hit the clutch shifted into 4th fully let off the clutch and hit the gas.. car doesnt move.. and nor does the rpms, they actually kinda stayed still kinda slowly dropping, could this be a boost cut? tuning issue im assuming?

 

That's not the clutch slippage then.

It sounds like it's disabling your throttle input.

I've got nothing...

 

I'm thinking in this scenario you are hitting fuel cut at the top of third because your clutch is slipping. Then your shifting into fourth quickly and the engine is still cutting fuel.

 

He shouldn't get fuel cut from clutch slippage though.

 

He has a big turbo so it may be slipping at high rpms and slamming the rev limiter. Just a thought. My car feels like it does that at times, my tack only shows 6,000 rpms but I hit fuel cut and the car backfires really bad.

 

Yeah but once he goes into the next gear, his RPM should drop and the ECU bases the fuel cut solely off the RPM and TPS (decel fuel cut).

 

Hmm. Seems like there's a few second cutout when I hit fuel cut.

 

I've bounced off my redline many times (from loss of traction, which in theory is the same thing as clutch slippage in terms of RPM:MPH) and it's nowhere near a few seconds, it's more like .3-.5s.

He also said that he sometimes has to take the car out of gear to get the throttle to respond again.

 

how about if you shift at 6900 hard - what happens? does it just bog ... like grrrrrrr and not go anywhere? Maybe the tune is off? What is your air/fuel at your point of shift?

 

hmmmm chad r u using the auto ecu?

 

 

Wait.....You have the Ultimate like me. And using the rev limit change feature...I hope your Tuner tuned the car "Past" the factory fuel cut (redline). I also hope that he inputted the proper "Wait Time" and "Fuel Cut" values in the Rev Limiter cut map. It sounds like that didn't happen, as you are shifting past the factory rev limit. Try shifting at 6100rpms and see how that works out. If it's all good, then obvious tuning issue on the RPM section past factory fuel cut.

I would consult Toan from PTuning to make sure your parameters are accurate. What is your A/F ratio at 7200rpms anyway?

 

i just did a couple pulls down the road.. first one shifted at 6800.. it happened.. 2nd one shifted at 6900.. i was still goin hard right into 4th gear so it didnt happen that time, shifted at 6100.. it worked fine, like the one above, shifted at 7200 and then 4th gear didnt move.. the rev limiter sits still when im gasing 4th when it doesnt work, this also happens in 4th to 5th to and 2nd to 3rd after im done spinning my head off. ima put a passenger in the car to stare at my A/F's im concentrating on the rpm's, when i go into the gas lightly at first then jam it it seems to work aswell.

what exactly are the wait time and fuel cut values? i think luiggi was talking about that, the wait time one, im running pretty rich at WOT in 3rd i think, like 10.5-10.8, clearly the tune isnt finished.

 

I knew someone would get a kick out of that one

 

I second rhythmnsmoke on all this statement.

Also maybe you are really lean when accelerating once you engage the new gear. You go from almost %0 throttle to almost %90 and if the fueling is not right that will happen!

Pito

 

Any chance you could get a video? If so, try the same stuff you just tried..where it works sometimes and other times it doesn't.

 

You have your Laptop in front of you with the Ultimate software on it? Open the Rev Limiter Cut map. There is a "Wait Time" field, what does that say? The Wait Time is the length the factory fuel cut stays active.

Pito has more experience than me in changing the rev limit, so glad your in here to help out Pito.