Atomic

iTrader: (42)

Sounds like faulty knock sensors then. I would definately replace them and have them turned back on. You dont want to not have them there, just in case. I didnt try any timing less than 17 so I cant comment on that.

dewmanshu

iTrader: (4)

I've tuned a handful of LQ9's and all of them were knock happy for sure. 17* on 93 octane seems to be the best I could get without constant kr. Still get a blip here and there. Don't turn off those sensors without figuring out if the knock was real or not. once you figure out it wasn't real, desensitize them but don't turn them off.

foose04

iTrader: (3)

I agree with this style of tuning on unleaded fuels. However, e85 is a little different. E85 won't knock till you really push it and at the point it does knock, it's usually to late. For the most part, i've found I can tune E85 timing and boost as aggressive as a c16 tune. In my talon, i've ran mid-high 13's a/f's at over 35psi on a 67mm, and didn't knock. Power was dropping, but was not knocking. The car made the best power with a/f's in the 12.0-13.0. I'd also rather make power on boost then timing. Timing really ramps up cylinder pressure.

Atomic

iTrader: (42)

Cylinder pressure is what makes torque, what do you think stuffing in more air does to cylinder pressure? Not trying to be a smartass, just saying.

foose04

iTrader: (3)

Timing just allows you to make the power you should relative to the amount of fuel/air you're burning. Increasing beyond that point will cost you power, and eventually parts. To increase power potential, you need to increase air/fuel flow. In this case, we're using boost. The tricky part comes in when adding boost requires dropping timing as a bandaid (in other words, more than you would have to drop it due to charge density increase, which doesn't cost you any power). This is where you need to be on the lookout for diminishing return.

Add the boost/airflow and required fuel, then the timing.

Spoolin

iTrader: (8)

I think he's saying something else concerning the burn rate on increased timing as opposed to when your boosting it to kingdom come with safe timing.

TURBHOE

iTrader: (4)

i'm right about 9:1 compression. running 93 with water/meth i run about 21 degree's thats when its cool as iat's rise the timming drops. but i could feel a big diff everytime i added timming. i just stop adding cause i didn't wanna push it too far.

with my silverado N/A i lost 20hp with 1 too many degrees of timing. i took the 1 degree back out and got 20hp back. it was crazy.

sureshot

iTrader: (5)

How high do your iat's climb on an extended wot run?

TURBHOE

iTrader: (4)

they useally drop right after i go wot by 20*or so then they slowly rise maybe 5-10* through out the run. i'll look at some logs tonight for some better numbers. cruising around it runs ambiet temps but at the track sitting still in the lanes it will get around 100* on a 70* day.

GMCtrk

iTrader: (27)

Here's the thing....even with IATs at 100*, the PCM with the stock IAT vs. timing table is already pulling 1-3+ degrees of timing.