Speed density tune
04-09-2024, 12:09 PM
#1
Intermediate
Thread Starter
Speed density tune
morning folks.. 02 Z06, purchased this in 2019 runs great, last dyno was 492 to the ground, has speed density tune. my question is, do i really need the speed density tune,
I find in the cooler weather, like now, highs of around 5-8 deg C. Sometimes I come to a stop and it will stall or try, I have to keep tap the go pedal to
keep it alive, is a pita to be honest, but the next day it won t happen.. am thinking of returning it to MAF. i don t track the car, just a little aggressive back road stuff.
Am thinking with the maf ecm will adjust to the current weather and temps and not have these issues.. Have had many Vettes over the years and done the cams and
mods myself and found it was always a bad investment when selling LOL this one i let someone else bite the bullet, so it was all set up. Originally it was a Cali car, so maybe the SDT was fine for weather conditions there.
Any thoughts and opinions would be appreciated..
Thanks Al
have been a long time lurker on this great forum
I find in the cooler weather, like now, highs of around 5-8 deg C. Sometimes I come to a stop and it will stall or try, I have to keep tap the go pedal to
keep it alive, is a pita to be honest, but the next day it won t happen.. am thinking of returning it to MAF. i don t track the car, just a little aggressive back road stuff.
Am thinking with the maf ecm will adjust to the current weather and temps and not have these issues.. Have had many Vettes over the years and done the cams and
mods myself and found it was always a bad investment when selling LOL this one i let someone else bite the bullet, so it was all set up. Originally it was a Cali car, so maybe the SDT was fine for weather conditions there.
Any thoughts and opinions would be appreciated..
Thanks Al
have been a long time lurker on this great forum
04-09-2024, 02:55 PM
#2
Racer
Are you using boost?
04-10-2024, 11:59 PM
#4
Racer
No reason you can't go back to a blended MAF/VE tune. SD only tunes have the advantage of having better throttle response at part throttle.
04-11-2024, 08:42 AM
#5
Intermediate
Thread Starter
04-16-2024, 02:29 PM
#6
Safety Car
MAF is so much more consistent as it actually measures airflow instead of calculating it. GM did something weird with IAT that makes these swing wildly with temp changes. Try an open loop speed density tune, that'll really open your eyes as to how screwy the logic was that they used in these things. Both my trucks are MAF only and throttle response is no different than when it was SD/MAF like stock.
04-20-2024, 05:54 PM
#7
Intermediate
Thread Starter
MAF is so much more consistent as it actually measures airflow instead of calculating it. GM did something weird with IAT that makes these swing wildly with temp changes. Try an open loop speed density tune, that'll really open your eyes as to how screwy the logic was that they used in these things. Both my trucks are MAF only and throttle response is no different than when it was SD/MAF like stock.
will probably not mess with it now.. or until the fall when I get annoyed again,,
thanks to everyone for thoughts and feed back