Help Please!!
Have my tune hanging in the rpms at WOT. 1 KR during WOT and after throttle cut, advance 39deg. Anyone know what parameter might be causing this? Any info is helpful, cheers!
Help Please!!
Have my tune hanging in the rpms at WOT. 1 KR during WOT and after throttle cut, advance 39deg. Anyone know what parameter might be causing this? Any info is helpful, cheers!
2007 Chevy Avalanche LT 4x4
Rough Country 7.5 Lift
Engine:2 Bar LC9 5.3L Flexfuel DOD delete
Volant Cold Air System, Ported Throttle Body, Jet PowrStat 180
Summit Stage 2(8701) Cam
Stock bottom-end
Longtube headers, Cat-less y-pipe
Trans: Mad Dog L3 4L70E
Post your tune
Ive need to adjust my tune where i turn the key I am not needing to play with the pedal. Idk if i am getting too much air at crank speed or to much spark. I got it to the point where the engine idles with minimal adjustment by ecu. Now I am checking WOT values and It is a bit advance to where the idle hangs in the rpms
Last edited by WickedAvalanche; 04-09-2020 at 10:25 PM.
2007 Chevy Avalanche LT 4x4
Rough Country 7.5 Lift
Engine:2 Bar LC9 5.3L Flexfuel DOD delete
Volant Cold Air System, Ported Throttle Body, Jet PowrStat 180
Summit Stage 2(8701) Cam
Stock bottom-end
Longtube headers, Cat-less y-pipe
Trans: Mad Dog L3 4L70E
It's actually not going to 39 degrees at WOT. Examining the datalog, it does spike up to 39 degrees timing, but that's only at 28% TPS. WOT will be around 84% TPS on your vehicle.
You need to zero out the base correction spark table, so that it doesn't add any timing during WOT.
You will still probably have to pull a couple degrees timing out of the high octane and low octane tables at high rpm. Typically, in heavy vehicles like yours, you'll only get around 24-25 degrees max timing at peak torque and around 26-27 degrees at high rpm, assuming you're running 93 octane.
idle airflow, idle timing, idle spark overspeed. 3 main culprits for idle hang
Michael Bray
Rusty Knuckle Garage
Slidell, Louisiana
20yr Master Tech.
Advanced Level Specialist
Custom Car Fabrication, Customization, High Performance.
GM World Class Technician
Shop Owner
2007 Chevy Avalanche LT 4x4
Rough Country 7.5 Lift
Engine:2 Bar LC9 5.3L Flexfuel DOD delete
Volant Cold Air System, Ported Throttle Body, Jet PowrStat 180
Summit Stage 2(8701) Cam
Stock bottom-end
Longtube headers, Cat-less y-pipe
Trans: Mad Dog L3 4L70E
Here is my correction from the last tune and the log. I trimmed the spark at high rpm in my High octane, adjusted base spark so it wasn't pulling timing at cranking speed. It also doesn't hang in high rpms, sounds nice But idles a little higher than before. Almost starts on its own after about 3 seconds, I might boost up the spark a bit more to get a smoother start. I guess this was in the right direction. Thanks
2007 Chevy Avalanche LT 4x4
Rough Country 7.5 Lift
Engine:2 Bar LC9 5.3L Flexfuel DOD delete
Volant Cold Air System, Ported Throttle Body, Jet PowrStat 180
Summit Stage 2(8701) Cam
Stock bottom-end
Longtube headers, Cat-less y-pipe
Trans: Mad Dog L3 4L70E