need help with my tune
Thread Starter
Teching In
Joined: Jun 2014
Posts: 5
Likes: 0
From: canada
need help with my tune hi all,
so this is all new to me i have never posted on any site looking for help so i apologize in advance.
anyways i just finished my build which is
1984 firebird swapped lq4 with t56 trans and 4.10 gears
the motor is a stock bore 6.0l lq4 with
ls3 heads and intake with 92mm throttle body
scat rods with arp bolts
dss racing flat top pistons with valve reliefs
BTR, LS3, Stage 3 Naturally Aspirated, Hydraulic Roller, 229 int./244 exh. Duration, 0.615 in./0.595 in. Lift, 113+4 LSA.
so i currently have the car running starts up and idles ok, i have already adjusted the base idle and airflow for the cam, so my issue atm is when the car switches to closed loop it starts misfiring and bucking in gear under load as soon as you start giving any throttle. so i commanded open loop in hp tuners and it runs pretty good to where i can actually drive the car but once i switch it back to closed loop in starts running really rough.
i attached my current tune and a data log file but i can get a better data log if needed.
so im looking for any help possible, i really appreciate any response. thank you
so this is all new to me i have never posted on any site looking for help so i apologize in advance.
anyways i just finished my build which is
1984 firebird swapped lq4 with t56 trans and 4.10 gears
the motor is a stock bore 6.0l lq4 with
ls3 heads and intake with 92mm throttle body
scat rods with arp bolts
dss racing flat top pistons with valve reliefs
BTR, LS3, Stage 3 Naturally Aspirated, Hydraulic Roller, 229 int./244 exh. Duration, 0.615 in./0.595 in. Lift, 113+4 LSA.
so i currently have the car running starts up and idles ok, i have already adjusted the base idle and airflow for the cam, so my issue atm is when the car switches to closed loop it starts misfiring and bucking in gear under load as soon as you start giving any throttle. so i commanded open loop in hp tuners and it runs pretty good to where i can actually drive the car but once i switch it back to closed loop in starts running really rough.
i attached my current tune and a data log file but i can get a better data log if needed.
so im looking for any help possible, i really appreciate any response. thank you
TECH Apprentice
Joined: Sep 2016
Posts: 347
Likes: 10
I haven't looked at your tune (dont have my tuning laptop with me) - but, have you adjusted your VE table?
Even in closed loop, any throttle transitions are going to refer to your VE table even if for a split second. If your VE table is far off from what it should be, you're going to get a situation where you're running very rough.
Surges/bucks are caused by lean spikes. I'd disable it all, go open loop, tune your VE.Smooth it all out. It really helps even in closed loop where you rely on O2's to keep you stoich.
Even in closed loop, any throttle transitions are going to refer to your VE table even if for a split second. If your VE table is far off from what it should be, you're going to get a situation where you're running very rough.
Surges/bucks are caused by lean spikes. I'd disable it all, go open loop, tune your VE.Smooth it all out. It really helps even in closed loop where you rely on O2's to keep you stoich.
