LS7 stalling issue

[GPGTP]

LS7 with a mild cam, headers, stock heads, intake and throttle body. It's installed in a 2006 GTM with manual trans.

The engine runs great at idle, cruise and wot. The problem lies when your moving. If your cruising and push the clutch in, rpms come down to idle nice and smooth but then it just dies. This happens also with the clutch out and out of gear

I bumped up the idle speed min vs vss but that didn't seem to help.

The attached scan shows the stalling at about 15 seconds.

BTW, it doesn't always stall.

[edcmat-l1]

Set it up so it's still in closed loop at idle and see if that fixes it. Also looks like the idle adaptive spark control is over aggressive.

[GPGTP]

Could you elaborate a little please?

Does the computer use coast down air and spark corrections whenever the vehicle is moving and the base idle spark correction only when mph is 0, kinda like the idle spark table? I'm assuming so since the adaptive spark locks in as soon as rpms hit the idle speed limit.

After comparing a stock file to mine, I notice i never adjusted the "idle adaptive spark control overspeed coast down" table. That sounds like my issue

I'm wondering if my minimum airflow tables could use some increasing too. Not sure exactly how the computer knows what gear I'm in.

[GPGTP]

Haven't looked at the tune or logs, but knowing what I know about those systems, you need to lighten up on the overspeed park tables, above like 128 RPM. What happens on decel, is the overspeed spark table pulls a whole bunch of timing out to get the engine to decelerate rapidly, and it can cause a stall (coastdown table mainly)

Using the overspeed spark table, you can control the deceleration of the engine.

Also, for idle control, it's better to have the over and under speed spark tables more agressive in the lower RPMs, and lessen the RPM adaptive idle controls, which slows down the throttle blade correction, which is more responsible for idle problems than the spark tables.

is this what you are refering to?

[IDRIVEAG8GT]

Ok, after lots of reading I made additional adjustments here, I'm gonna try this tune tomorrow. I lowered the proportional and integral enable rpm error to help underspeed corrections but made the overspeed corrections way less aggressive. I also, adjusted the spark overspeed tables, to make them less aggressive.

I thinking about matching the idle, high octane and coast down tables but I'm not sure which one to go with. I'm assuming the high octane.

Some input would be greatly appreciated guys

Dont match the idle to the high octane. That's a big no no, unless you want it to have a ridiculously amount of timing issues at idle.

You're on the right track with everything else you've done

[GPGTP]

thanks for the feedback, I'm gonna try it today. After comparing it to the 3rd gen with LS swap I did, it seems I went in the same direction.

BTW, this car is retardedly fast.

[GPGTP]

Figured It Out, Thanks

[DrLoch]

What was it?

[GPGTP]

either a vacuum leak, air flow integral tables or clutch fuel cutoff. Not sure which one. I was noticing the maf dropping to like .5 lbs at 1000rpm, when it's normally like 1.8ish. Something was making the maf read funky (like a vacuum leak) or the clutch was cutting fuel. not sure.