6.2 LS3 timing

[JnJSpdShop]

a friend of mine was on the dyno the other day, and we coudl've easily pulled of 29* of timing, but it was only a gain of 2-3hp, not worth it to be honest.. would rather keep the engine out of any possible knock later down the road...

richen ur mixture to a 12.5 and see how much you'd be able to pull off

Maybe on a dynojet or dyno wtih no load

Hmmm, that's pretty funny. I have the L92 heads/L76 intake on my 6.0 iron block engine and I can run over 30* with no knock. You probably have other tables pulling the timing.

Lots of variables come into play with vehicle weight, gear ratio, transmission and camshaft

Nope Wont Work, The Factory Tables In That Area Of The Map Are 19° And Right Now With 22° In My Tables I Still See Up To 2° Or Kr At Times.

The Lsx Engines Dont Need Alot Nor Do They Tolerate Alot Of Timing, 24° Is Usually The Absolute Max For A Stock Engine.

By The Way I Have A 2009 G8 Gxp As Well....

That is what happens when you have an efficient cylinder head along with a cars that are heavy like tanks. Almost every factory cam'ed Camaro, G8 with have KR on the factory tables. If you lower the timing around peak torque you can put a few degrees of timing in on the top end. If you don't it will rattle from peak torque all the way to redline

[CactusG8]

23-23.5 for pump gas bolt on ls3/l92 engines maintaining the factory curve. 24-25 for mild cam setups to slightly make up for compression loss. More efficient heads require less ignition timing to make power.

It made more power with 25. But still a little disappointing. 451 rwhp 439 torque. I was looking at the graph. All across it read 12.85. Super steady. I run E10 so maybe some more fuel would of helped with the hp??? The dyno was done at 3500 DA. But it was corrected. Also maybe the motor will loosen up a bit with a few thousand miles on her.

[Area47]

richen it up a tad to around 12.5 and see what it does.

[MikeOD]

Set your PE to 1.176...which is Lambda 0.85...which on pump gas equates to about 12.5:1. On E10 it'll be more like 12.0..either way, that seems to be where LS3's make the best power/torque numbers. The more power you make, the more cylinder pressure you make, which means more heat...which generally needs more fuel to stay out of problems and make clean healthy power.

[MikeOD]

...and why is this thread in the transmission section?

[johnh]

Not sure why its in the Trans section, but its a great post.

I did some testing at the track on Sunday, using this post as a guideline. Got decent times with higher timing 25-27, but got a slightly better time with lower timing 21-23 range. Also played with AFR and 12.5 as advertised seemed like the sweet spot. Plus on the higher timing saw a couple of blips of KR...on the lower 0. Convinced me that you can make power at the higher timing, but you'll do just as well or better in the 21-24 range...at least for a mostly stock G8 GT.

[CactusG8]

On a stock or mostly stock G8 that sounds about right. For cammed guys that have overlap that bleed off compression at all rpms 24 to 25 seems to generate the most power. Mine was done on a dyno. It had it's most horsepower and torque at 25. But that was mine. Each car is different.

[04blackgmc]

Cammed LS3 cars i always run 23-25*

[johnh]

And I was running 93 octane...but now with the lower timing, I could probably go back to 87. Might have to remove some timing from the AFM areas though.

[SultanHassanMasTuning]

overlap create in a sense less compression (so you can get away with more timing)