instg8er

Just able to get the car out some with this good weather we have been having in NC and have notice that if I shift from 2-3 or 3-4 at or near 7000 the car feels like it hit a timing retard or it stalls the motor. some times it will clear up and drive thro it. today i poped back and made a hell of a noise, i let out of it and hit it again and all is good??? Im not sure what he has the rev lim. at but the dyno is pulled to 7400 and i am not going that high.

Any help or any one had this problem?

Thanks for any help. I know i cant have this happen when i spray it in a few weeks is all....

jayyyw

In for info. I may be having the same issue.

Patriot Six

It sounds like you hit the fuel shutoff. I would check to see where it is set at in your tune. The tachometer reading may lag behind actual rpms. It has caused me to hit the rev limiter numerous times.

LMB-Z

Sounds to me like you hit the rev limiter. Should be set at 7000, unless its been changed.

Michael_D

You'll have to look at the calibration. Both spark and fuel can be used for rev limit.

EnginerdVT

If it's fuel cut rev limiter, I wouldn't practice that too many times. Even my full bolt-on car outruns the RPM gauge here and there. Don't know your mods, but MANY cars stop making power north of 6500, some less. Is your setup optimized to run that high and make power? Not trying to deny that it sounds like something might be inconsistent.

Michael_D

No idea what you just asked me.....

Turbo2L

Are you still on the stock clutch?

instg8er

Rps BC3

EnginerdVT

I'll try again without the other comments with my original quote below...

Does your car have parts installed that continue to make more power above 6500 RPM?

"Don't know your mods, but MANY cars stop making power north of 6500, some less. Is your setup optimized to run that high and make power?"

instg8er

Yes sir it is.

lamboworld

Hope you get if figured it out. I am just curious though, do most of you turn off the clutch fuel cut off. My tuner has turned this off, so my fuel does not cutoff when the clutch is depressed.

Michael_D

Not that it matters what my car will do, but yes it will carry power over 6500 rpm. My comments were directed towards the OP's issue and had nothing to do with my car's capabilities.

There are numerous tables in the calibration that control over rev. Depending on where the tuner set them, they may not play nice together. That's why I said what I did. Need to know the current calibration settings before jumping to a conclusion of what could be causing the symptoms the OP described.

If they are set correctly, then bumping the rev limiter is not a problem. If racing a clock, I'd try not to do that, as it'll slow you down, but there is no issue with bumping the limiters - assuming they are set correctly.

EnginerdVT

Oh I confused you and OP as I'm viewing from my phone. I was quoting your mention of the two kinds but was directing my question on the cars capabilities toward the OP. Sorry for the confusion.

dmuellenberg

News to me - I didn't know the Z06 had a clutch fuel cut off. I have power shifted many times (keeping the gas pedal to the floor when shifting) and I've never experienced the fuel being cut off. Also you wouldn't hit the rev limiter when missing a shift but that happens. Maybe it is turned off by defualt?

instg8er

I hope to be home and able to check and see tomorrow night with HPT. But it's going back in the rollers Friday for the 200 shot. And will be address then for sure.

Michael_D

No worries.

Clutch fuel cut off can be tweaked for no-lift shifts. Cool if you like that.

Pinski 1

Sure you aren't spinning? Do you have traction control on? My car was doing the same thing after heads and cam so I thought I was having issues...come to find out, the tires were breaking loose and traction control was kicking in. Hit the T/C button once and no more issues....

instg8er

I always turn off and hold down do turn off handling also. It's not spinning for sure. It's a fuel cut or timing cut. Feels like the power is stopped and starts stuttering and popping back. I lift and get back in it and all is good.. I have seen a engine drag one time also in the message center.

Patriot Six

Engine drag active means the ECU is giving more throttle upon decel due to larger than stock rear tire sizes in comparison to the front tires. It's hardly noticeable and not the cause for the issues you're having.