The ls1 in the camaros have more aggressive timing due to the trucks having to deal with additional load sometimes (towing). My timing is only 18 degrees at WOT and I have zero knock retard. This was based on the old 4.8, but I now have a 5.7 ls1 with ls2 heads. The AFR correction adds 2 degrees, but then the IAT correction pulls 2 degrees out since its 95 degrees under my hood. So its only 18 degrees total at WOT. Shouldn't it be more like 24-28?

I want to add some timing and make some passes to watch for knock.

What is a good starting point? Just add 2 degrees at a time until it stops making power, but before I see knock retard?

 

All setups are diffrent and there is many factors. I may get a little grief for this but 24* to 26 * is what I would start with and see what you get if there is any knock retard. You will need to play with it and see what works best. I assume you have the tuning software

 

I'd only add 1-2 degrees at a time to be safe. I don't like just jumping to a random number.

 

Yea, I have HP Tuners pro. I was just trying to get an idea of how much timing other NA trucks run on average. I realize there will always be different factors involved and that it will vary a few degrees on each setup.

I also know the best way to do this would be on the dyno. The truck has already been tuned on the dyno, but with stock exhaust. Now that I've installed a better flowing exhaust i think it would benefit from a retune. Dont really feel like paying someone to tune it on their dyno, especially since I've spent money on HPT. So my plan is to log the cyl airmass, total timing, and KR. Then add a couple degrees of timing to the necessary cells, smooth, and repeat. I will have to drive the truck after each adjustment and see what the butt dyno says. Of course if I see any knock retard I will dial it back. Not ideal, but this is all i have to work with.


So, how much total timing does your truck run?

 

When I was NA, I was at 29 with no knock.

 

Cam specs, compression and exhaust all play a role.

 

Stock cam may only take 23-24* larger cam will likely take more

 

Yes, i realize all the different factors that will play a role. I was just trying to find a ball park range.

Thanks to the one guy who actually posted his timing. I think its safe to say that we (trucks) can run similar timing as the more aggressive ls cars do. Id also be careful towing with higher timing knowing that GM dialed it back for that reason.

But i doubt many of the guys who crank their tune up use their trucks to hual anything but ***.

 

The last LS1 car I messed with was a near stock 2000 WS6 with a 6spd and 4.10s. From 2,400-5,200 rpm it responded well with the timing at 24* BTDC, from 5,200-redline it liked 26*. ZERO knock retard on 93 octane with AFR in the mid 12s.

 

I just cranked it up 3 degrees under 3000 and 5 degrees up to redline. It seems to love that extra timing. Zero knock. Unfortunately my stock truck injectors are at 102% duty cycle over 5500. Guess its time to upgrade. Might as well do a fast lsxrt and tb while im at it.