I need some spark timing info

Aug 12, 2010 | 04:29 PM

Robert AMG

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Cls63 & C32

I need some spark timing info

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.

Last edited by Robert AMG; Aug 12, 2010 at 04:31 PM.

Aug 12, 2010 | 04:58 PM

Gramma_Benz

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2002 C32, 2012 S550

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.

Aug 12, 2010 | 05:05 PM

Robert AMG

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Cls63 & C32

Quote:

Originally Posted by 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.

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?

Aug 12, 2010 | 09:15 PM

blackbenzz

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Quote:

Originally Posted by Robert AMG

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?

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

Aug 12, 2010 | 11:47 PM

c32AMG-DTM

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2008 A8L, 2002 996TT X50, 2009 X5

Quote:

Originally Posted by Robert AMG

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?

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?

Quote:

Originally Posted by blackbenzz

"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.

Aug 13, 2010 | 09:06 AM

Robert AMG

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Cls63 & C32

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?

Aug 13, 2010 | 09:14 AM

Lenin

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2002 C32 AMG, 2013 GLK 350/4, 2015 E63S AMG Wagon

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

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Aug 13, 2010 | 10:45 AM

c32AMG-DTM

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2008 A8L, 2002 996TT X50, 2009 X5

Quote:

Originally Posted by Robert AMG

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?

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...

Aug 13, 2010 | 11:31 AM

#10

Lenin

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From: North NJ

2002 C32 AMG, 2013 GLK 350/4, 2015 E63S AMG Wagon

Quote:

Originally Posted by 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...

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?

Aug 15, 2010 | 04:21 AM

#11

ali saklaoui

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From: Beirut Lebanon

C32AMG.335 e92 fbo.protomotive996 gt2

Quote:

Originally Posted by Robert AMG

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?

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.