Car Hesitating under WOT

[Nick71692]

So recently i noticed if im cruising along and put my foot to floor the car hesitates, almost feels like a quick downshift in an auto car (mine is a 6 speed) then power comes on. The hesitation comes right when I floor it and then all is good to redline. Does it in every gear no matter the rpms or speed. If I roll into the throttle no issues. Kinda has me stumped as to why

Car has a 93 oct tune from lund
Stainless works headers
Solo performance exhaust
Drop in k&n air filter, stock box

Any ideas why the hesitation or has anyone experiences this?

Sponsored

 

[5LITERV8]

I had a similar issue with the Bama tune when I first flashed the ECU although mine is manual but it would cut off under WOT. It turned out I had the incorrect tire revs per mile. After I corrected that and reflashed it again it went away. Not sure if the Lund tune has that option but if it does I would check that.

 

[Dominant1]

Its the tune send your logs to lund, they'll fix it!

 

[Nick71692]

Well thats interesting I did just put on new wheels, project 6gr 20x10s and 20x11s. I wonder if thats it?

 

[5LITERV8]

So this just started when you changed the new wheels/tires, correct? It was running normal before? If so then it has to be the same issue I had. I would check with Lund if you can adjust the tires revs per mile yourself or they will have to email you a new tune.

 

[Nick71692]

Well not sure. I got it all done at the same time so the only thing i can compare it to is stock with pp wheels. Long tubes, wheels and tune were all done together

 

[ManBearPig]

Are you sure it didn't do this before? If it's subtle, you think it's possible you may have just not had the car under the right circumstances to notice before? My car has always had a subtle hesitation like you describe under just the right circumstances. Im actually hoping s tune will lessen it but it may not.

 

[Nick71692]

definitely not present before. Had the car on the track (road course) in stock form and had plenty of instances where I would have noticed the hesitation.

 

[jasonstang]

What driving mode are you in?
Normal mode does soften the throttle response a little.

 

[Nick71692]

I used to drive in sport mode but now with the tune its far too sensitive for me on the street so I started driving in normal mode. I did switch modes though to see if it was still present and it was so the modes did not impact it.

 

[ManBearPig]

Have you done any data logging and if so...does anything show up in the logs? Id think it's got to be in the tune. Since your still running the OE intake, could you flash back to stock to see if the issue goes away?

 

[Nick71692]

Good point, could do that. guess that would help narrow in on where the issue lies although I always heard you never want to run these cars on stock tune with headers...not sure if anyone could confirm.

 

[ManBearPig]

If I'm not mistaken, the car should run fine but you will get a CEL because the rear 02's will be reading out of range due to your lack of cat converters. Hopefully someone more knowledgeable will chime in but I can't see how you'd have any real issues on the stock tune just for diagnostic purposes.

 

[Nick71692]

So lund said you cant adjuat the tire rev on a 2015. Loaded the stock tune back to ight and the heaitation seems to be there just not near the same level.

Did a couple other searches and seen older s197s had the problem often and it was everything from dirty MAF sensor to a bu ch of people saying its the traction control system. The traction light doesnt come on when I do it but they said its the computer managing the torque.

Need to try it with traction control off and get logs

 

[ManBearPig]

There's a maxi fuse you can pull to get rid of all the traction control and ABS. May be worth a shot to rule that out.

Sponsored