Tune LS3 416

[Jhayes]

Does anyone have a tune for this engine or close? I'm an engine builder not a tuner. Need help, getting backfire through exhaust at idle. Enriched idle setting, still doing it. Bought new injectors, thought one was going out. I'll see if that works, meanwhile if anyone has a good tune, I'd like to see it.

[81 TransAm]

I have a LS 6.0L with LS3 aftermarket heads & intake. My cam is 218° @ .050" on the intake side. I have a 4L60E transmission. This is my latest tune.

[Jhayes]

Thanks, I'll give it a try.

[Jhayes]

I can't download it. What am I doing wrong?

[81 TransAm]

Not sure why. Mine is also a 24x reluctor and 1x cam sensor. Yours will be a 58x reluctor. This would need to be changed.

[andrewb70]

If you're getting backfires through the exhaust, you have a wiring problem, not a tuning issue. I would be happy to work with you to resolve this problem and also help with tuning. Andrew

[Jhayes]

Andrew, that would be very helpful. I figured my camshaft might be too large for the base tables.

[Jhayes]

Engine: 416 LS3, N/A
Camshaft: Comp Cams 281-XR13
Duration @ .050": 228°, 240°
Lift: .571", .590"
CNC ported LS3 heads,
Fast LSR intake, 102mm throttle body.

I have it on my test stand, running basically straight headers, some 3" Cherry Bomb mufflers I grabbed locally. Not sure if this is causing it. I'll probably need a special tune.

[andrewb70]

@Jhayes: I'm sending you a PM.