Paul57

I am curious where you guys have your idle timing at...from 0 to 1000 rpm?? I have a good starting point for the rest but some guys are saying they have 20+ degrees of initial. I have a hard time believing the motor turns over very well when you get that much timing (or more) when cranking 0 to ??? rpms. On the traditional SBC I use to only run about 12 degrees max (cranking/initial).

Paul57

Someone must be willing to share their results/experience???

topbrent

iTrader: (1)

I searched "timing curve".

This thread has some pertinent info on idle timing.
https://ls1tech.com/forums/conversio...l?ref=esp-link

Paul57

Thanks. I have done searches before and don't remember that thread. There was some good info in there. I have seen posts before where guys say they are running 20+ degrees initial and I guess I did not understand if that was from 0 to 1000 (approx) or if they have to start out lower at 0 and ramp up to 20 at 1000 (approx)?? I was just looking for some clarification.

Z28/2002

iTrader: (27)

Mine is 15* at 0 rpm, ramps to 28* at 500 rpm then it's at 32* from 800 rpm up

Paul57

Thanks for the info. That seems very aggresive?? I would never have guessed that those degrees were tolerable at them RPM levels.

xpndbl3

iTrader: (23)

12 degrees from 0-500rpm

600-1000rpm is 24 degrees

1100-2900 is 38 degrees for better a/f ratio under cruise conditions, it really helped

3000-7400 is 34 degrees


converter is 3700 so it will flash past the lower rpm range so the higher timing is under a low load condition

3pedals

iTrader: (3)

that is VERY close to how mine is setup. my engine seems to really like alot of timing at lower rpms, below where the cam comes on hard. I never load the engine at those low rpms, so I have not had any trouble with pinging, or deto.

Paul57

That was another thing I was curious about...how many degrees you can change per 100 rpms. I would never have guessed you could go 14 degrees in 100 rpms.

xpndbl3

iTrader: (23)

you can go 50 degrees in the software if you want

Paul57

I knew you could do a lot in the software but I just wasn't sure if the motor could take such a dramatic change that quick.

Rhino83

iTrader: (5)

xpndbl3 are u using a map sensor with that timing curve??? if so how much map advance???

xpndbl3

iTrader: (23)

no map presently, but I will be adding a few degrees here or there in the 35-55mph range on the map sensor under light throttle to clean it up and get a little better mileage as well. How much I won't know until next spring, car is getting a lot done to it this winter

Gray86hatch

iTrader: (83)

I run all my stuff at 40 at idle. Just keep advancing it till the idel is the best.

Then I pull a little out above idle for cruse but leave most in it. The map pulls it out once it sees load.

Tim