M7 throttle lag
05-18-2018, 08:22 PM
#1
Pro
Thread Starter
Member Since: Aug 2012
Location: Memphis Tennessee
Posts: 637
Likes: 0
Received 186 Likes
on
116 Posts
M7 throttle lag
Hey everyone. Hoping someone can point me in the right direction. I've got a 2015 Z06, M7 with 2" longtubes, halltech CAI, 2.31 upper pulley and tune.
We all know about the throttle lag problem with this car. I was hoping a tune would take care of some of it, however, it didn't. I finally had enough and purchased a ported throttle body from Tony Mamo. Unfortunately, this did not fix the problem either. I can be in neutral, put my foot to the floor, release and the pedal snap back all the way before the rpms move (while sitting still). I'm moving in say 1st or 2nd gear and hit the pedal quick, say maybe half throttle and let go, there's still about a half a second of lag before the rpms move. Same with WOT.
I've got a call into Tony to see if he knows anything (left a message) and I've also got my tuner looking at the tune again to see if anything was missed. My tuner is a very reputable and very respected LS/Camaro tuner who also does LTx. Not sure how big of a difference in tuning the two are. Does anyone have any idea what it could be assuming the tune is ok and there's nothing wrong with the PTB? I had a full bolt on LS3 Camaro before this car (no tune), and the throttle was instant on it. I mean, if I was in 1st or 2nd and barely press the pedal, you were put back in your seat. On the Z06, it's almost like it barely even moves.
EDIT: I've been reading around and it looks like (at least for the A8 guys) the touring mode is worse than sport or track mode. I drive in touring mode everywhere and didn't think to try sport or track mode to test the lag. Either tonight or tomorrow I'll go for another drive and see how it is in different modes and maybe the answer is to drive in sport from now on, although I prefer the less stiff ride of touring. I've also read about doing some tuning in the driver demand tables A B and C, which after looking over my tune doesn't look like my tuner did much to. Maybe this is my issue? According to this post that table should be edited: https://www.corvetteforum.com/forums...post1595539794
Any help would be greatly appreciated.
Thanks
We all know about the throttle lag problem with this car. I was hoping a tune would take care of some of it, however, it didn't. I finally had enough and purchased a ported throttle body from Tony Mamo. Unfortunately, this did not fix the problem either. I can be in neutral, put my foot to the floor, release and the pedal snap back all the way before the rpms move (while sitting still). I'm moving in say 1st or 2nd gear and hit the pedal quick, say maybe half throttle and let go, there's still about a half a second of lag before the rpms move. Same with WOT.
I've got a call into Tony to see if he knows anything (left a message) and I've also got my tuner looking at the tune again to see if anything was missed. My tuner is a very reputable and very respected LS/Camaro tuner who also does LTx. Not sure how big of a difference in tuning the two are. Does anyone have any idea what it could be assuming the tune is ok and there's nothing wrong with the PTB? I had a full bolt on LS3 Camaro before this car (no tune), and the throttle was instant on it. I mean, if I was in 1st or 2nd and barely press the pedal, you were put back in your seat. On the Z06, it's almost like it barely even moves.
EDIT: I've been reading around and it looks like (at least for the A8 guys) the touring mode is worse than sport or track mode. I drive in touring mode everywhere and didn't think to try sport or track mode to test the lag. Either tonight or tomorrow I'll go for another drive and see how it is in different modes and maybe the answer is to drive in sport from now on, although I prefer the less stiff ride of touring. I've also read about doing some tuning in the driver demand tables A B and C, which after looking over my tune doesn't look like my tuner did much to. Maybe this is my issue? According to this post that table should be edited: https://www.corvetteforum.com/forums...post1595539794
Any help would be greatly appreciated.
Thanks
Last edited by DomLS3; 05-18-2018 at 08:56 PM.
05-19-2018, 01:13 PM
#2
Le Mans Master
Member Since: Aug 2001
Location: Savannah GA
Posts: 6,070
Received 280 Likes
on
213 Posts
Cruise-In IV Veteran
Sounds to me like traction control kicking in. It will do that on the first to second shift easily. Stalls for a half second. Try putting it in sport or been tour but turn traction control off. Leave active handling on. As long as you don’t get too sideways that will get rid of the stall. I am in competition mode ever time I take mine out hold center button down for few seconds until both lights are on in dash. Only do that if you truly understand the dynamics of the car otherwise you will end up in a tree or off the road. I am not recommending taking active handling odd. Just traction control.
05-19-2018, 01:15 PM
#3
Le Mans Master
Member Since: Aug 2001
Location: Savannah GA
Posts: 6,070
Received 280 Likes
on
213 Posts
Cruise-In IV Veteran
GM also puts a little delay in the accelerator off floor look into the vitisse controller. I have heard mixed reviews on it. Personally I don’t experience your issue especially with traction control off. Hard to say.
05-19-2018, 01:31 PM
#4
Tech Contributor
Member Since: Oct 1999
Location: Charlotte, NC (formerly Endicott, NY)
Posts: 40,113
Received 8,950 Likes
on
5,343 Posts
Have been running my 15 Z06 on track and the street for 2.5 years and haven't experienced any throttle lag.
Bill
Bill
05-19-2018, 03:50 PM
#6
Le Mans Master
Member Since: Oct 2005
Location: Metro Detroit Michigan
Posts: 7,078
Received 1,817 Likes
on
1,085 Posts
Thottle-by-wire cars tend to have a little bit of throttle lag, but the ZO6 is the most severe I have experienced, much worse than on my C5. I know exactly what you mean about giving the throttle a quick stab, and being completely back off the throttle before the car lurches forward. Kinda shocked me at first, and seemed a little dangerous, but I guess I'm learning to deal with it.
Last edited by Warp Factor; 05-19-2018 at 03:53 PM.
05-21-2018, 09:54 AM
#7
Pro
Thread Starter
Member Since: Aug 2012
Location: Memphis Tennessee
Posts: 637
Likes: 0
Received 186 Likes
on
116 Posts
Still waiting on my tuner to get back with me but after I've done some more reading, I'm almost 100% certain it's in the torque management options in the tune. I'll let everyone know what happens once I get it figured out. Hopefully some tuners will chime in here and give some insight aswell.
05-21-2018, 03:53 PM
#9
Still waiting on my tuner to get back with me but after I've done some more reading, I'm almost 100% certain it's in the torque management options in the tune. I'll let everyone know what happens once I get it figured out. Hopefully some tuners will chime in here and give some insight aswell.