Rev Match and High HP
Thread Starter
Drifting
Joined: Sep 2013
Posts: 1,906
Likes: 51
From: Tampa Florida
Rev Match and High HP
Do any of you guys who have higher HP cars have an issue when accelerating with RevMatch enabled? I've noticed if I've had it on and went to accelerate hard the car will sometimes buck hard, like whiplash hard... Like I floored the gas, hit the brake floored the gas hit the brake.
I can't remember if it did it when I was around 650hp, but definately did it when I was at the 800 mark and now at the 1000+ hp.
This happens when taking off hard from a stop, not sure if wheel spin is contributing, part of the tune parameters, etc. I can't say if it does it every time as I don't use rev match a lot, but if I use it now I have to turn it on and off when I'm accelerating or downshifting.
I know how rev match works when downshifting, but how does the system work when accelerating hard?
Thanks
I can't remember if it did it when I was around 650hp, but definately did it when I was at the 800 mark and now at the 1000+ hp.
This happens when taking off hard from a stop, not sure if wheel spin is contributing, part of the tune parameters, etc. I can't say if it does it every time as I don't use rev match a lot, but if I use it now I have to turn it on and off when I'm accelerating or downshifting.
I know how rev match works when downshifting, but how does the system work when accelerating hard?
Thanks
Safety Car
Joined: Sep 2006
Posts: 4,364
Likes: 408
From: Greer, SC
No problem at all here when accelerating with Rev Match on. I have 700 RWHP so I'd call that high hp 
I have a minor issue with Rev Match but it happened after I put my MGW shifter in. When I go into neutral it will sometines Rev Match. It will also do it with the clutch out when slowing down. A minor annoyance but I don't use Rev Match often anyway.
I agree with Higgs, probably an issue with the tune.
I have a minor issue with Rev Match but it happened after I put my MGW shifter in. When I go into neutral it will sometines Rev Match. It will also do it with the clutch out when slowing down. A minor annoyance but I don't use Rev Match often anyway.
I agree with Higgs, probably an issue with the tune.
Thread Starter
Drifting
Joined: Sep 2013
Posts: 1,906
Likes: 51
From: Tampa Florida
Is rev match supposed to interact with acceleration? Or just downshifts?
Race Director
Joined: Jul 2007
Posts: 10,961
Likes: 2,643
From: Texas Hill Country
if it does it at other times, which it sounds like it does during normal acceleration, you are supercharged in my best estimation based on your power level, there are a few things that could be causing your issue....
mechanical issue like a boost leak, problem with your blow off valve, vacuum leak, etc or a tune issue where the throttle body is fluttering trying to modulate a torque level.
worse, you may be experiencing a classic "lean buck." not enough fuel and needs to be addressed asap.
is it happening at part throttle, full throttle, or both no matter what at 4K RPMs? any other specifics you can give?
Instructor
Joined: Sep 2007
Posts: 239
Likes: 22
From: Stockbridge GA
Rev match should not do anything on normal up shifts.
Thread Starter
Drifting
Joined: Sep 2013
Posts: 1,906
Likes: 51
From: Tampa Florida
rev match should not affect anything except when you are moving the shifter with the clutch in.
if it does it at other times, which it sounds like it does during normal acceleration, you are supercharged in my best estimation based on your power level, there are a few things that could be causing your issue....
mechanical issue like a boost leak, problem with your blow off valve, vacuum leak, etc or a tune issue where the throttle body is fluttering trying to modulate a torque level.
worse, you may be experiencing a classic "lean buck." not enough fuel and needs to be addressed asap.
is it happening at part throttle, full throttle, or both no matter what at 4K RPMs? any other specifics you can give?
if it does it at other times, which it sounds like it does during normal acceleration, you are supercharged in my best estimation based on your power level, there are a few things that could be causing your issue....
mechanical issue like a boost leak, problem with your blow off valve, vacuum leak, etc or a tune issue where the throttle body is fluttering trying to modulate a torque level.
worse, you may be experiencing a classic "lean buck." not enough fuel and needs to be addressed asap.
is it happening at part throttle, full throttle, or both no matter what at 4K RPMs? any other specifics you can give?
Only during hard acceleration, 2 gear, 3 rd gear. It's hard to say exactly what RPM range, not really looking at the tach but definately into boost.its only done it a handful of times and I'm almost positive it only been with rev match engaged.
The tuner has the car now and one thing that they were addressing is that it was actually running a little rich Down low. I can't remember exactly what they said but he told me something to the affect that it was hitting 4 psi so quickly that the car was thinking that I was full throttle and making the car run rich. I'll get more info what he said.
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Racer
Joined: Jul 2007
Posts: 441
Likes: 156
From: Jax FL
I have an auto and I've had the rev match in Sport and Track. depending how aggressively you floor it the car it throws it into performance shift and when you slow down dramatically you feel it kick in. It is initiated a lot faster in Track Mode vs Sport though. Also it happened when I was stock too so I cant say it has to do with more HP causing it.
Drifting
Joined: Nov 2012
Posts: 1,665
Likes: 17
From: Bradenton Florida
St. Jude Donor '13
The tuner has the car now and one thing that they were addressing is that it was actually running a little rich Down low. I can't remember exactly what they said but he told me something to the affect that it was hitting 4 psi so quickly that the car was thinking that I was full throttle and making the car run rich. I'll get more info what he said.
I'd blame the ... Oh wait the tuner just did blame the tuner LOL.
Thread Starter
Drifting
Joined: Sep 2013
Posts: 1,906
Likes: 51
From: Tampa Florida
The problem that has happened, again only a few times, has had nothing to do with the actual shifting, just accelerating hard in gear.
I'm not even sure if it could even be related to traction control. I usually just keep it on, but that may also be trying to interfere, even though it's a very intermittent problem.
I'm not even sure if it could even be related to traction control. I usually just keep it on, but that may also be trying to interfere, even though it's a very intermittent problem.
Last edited by Motohead279; Sep 7, 2015 at 01:30 PM.
Pro
Joined: Feb 2023
Posts: 579
Likes: 165
I know this is an old thread but wanted to revive it because I am having this issue. With rev match on and I hit a power cut when going WOT. With rev match off I have no issues. Only under heavy acceleration in boost. Feels like an ignition cut.
2015 Z51 M7 with A&A V3-SI and TSP long tubes making 550whp
2015 Z51 M7 with A&A V3-SI and TSP long tubes making 550whp
Pro
Joined: Feb 2023
Posts: 579
Likes: 165
Going back in for retune after I install my alky control meth kit and will bring it up to them. Was hoping it would be a simple table to modify but I'll leave the torque model stuff up to them lol