Robert AMG

iTrader: (1)

I got a datalogger so i am reading timing boost AIT rpm , if someone has knowledge about timing advance-retard where i must see the timing? at which gear?rpm? where the safety range must be, how can i know if it is retarding? thanks.

Gramma_Benz

I just datalog and use the info as a reference along with Air Intake Temperatures. This way, you can get an idea of how much timing is being pulled when intake temps/engine temps rise.

Robert AMG

iTrader: (1)

ok i need to know in which range the timing is pulled, i see timing from -36 to 0, ex: if at 6000rpm the timing is -16 at 158F is it retarding or no?

blackbenzz

You cant determine if timing is being retarded based on the info you gave. It just says you are running 16 degrees of timing WOT at 6000rpm. I'm not sure at what IAT the C32 ECU retards timing. Your ECU will also retard timing if it sees knock

c32AMG-DTM

You're running between 0 degrees and 36 degrees of timing. And, as BB mentions, you're running 16 degrees of timing at WOT and 6k rpm. What is your boost pressure and AFR at that point?


"ECU will also retard timing if it sees knock" - only if the tune allows it to though, right? I've read some alleged reports in the last couple years that some tunes remove/limit some of the ECU's ability to successfully retard enough timing if it senses knock/detonation.

Robert AMG

iTrader: (1)

3rd gear from 5000 rpm to 6000 at 30-33 psi(4600ft altitude) AFR between 12 to 13, timing between -20 and -16 : those timing nb are normal or not?

Lenin

30-33 psi? That doesn't sound right. Is that before subtracting absolute pressure?

Robert AMG

iTrader: (1)

yes, need to substract 12.5 psi at 1400m (4600ft).

c32AMG-DTM

Don't want to lead you astray; this really is a question you should discuss with your tuner - especially if you are sharing your datalogs with them.

Altitude helps in this case...

Lenin

I agree. You should contact Jerry. The AFRs look a bit high to me. But I'm not sure how your altitude and the hot Lebanese summer temperatures can effect the C32. Have you looked into something like the KS-3 from Phormula for knock detection?

ali saklaoui

Robert, when you say -16,the negative value means advanced timing not retard.it means that is igniting 16 degrees before the TDC.your values are great.