Thread: Timing with s4....need HELP!!

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i got the instructions from the thread vadim has in the tech section here. i can't find the original site they are on (although i have stumbled upon it).

http://www.sr20-forum.com/naturally-aspirated-all-motor/2566-how-adjusting-ignition-timing.html

found it....
http://www.geocities.com/MotorCity/Track/9085/

"PS: When I was at the SoCal February 19th meet, Mike Kojima set my timing. The procedure that he followed was a lot simpler than the one listed in the FSM. He warmed up the car to normal operating temperatures, disconnected the TPS while the car was still running, revved the engine three times to about 3,000 rpm to lock in the engine in timing mod, and then adjusted the timing. I like this procedure and I will use it in the future."

If you have a programmable ECU, then you should be setting your timing to 15* and no more. Further advances in timing should be handled by the ECU map, and hence no need to do it by the distributer.
The procedure you listed up in your first post seems to be correct. The important thing with this process is to ensure that at the end of the process your car settles into Base Idle mode, which is where it will settle to an idle and the timing mark should not be moving and should be holding still. If it is still moving, then it has not entered base idle mode.

As you stated earlier, if the engine is not idling well, you can set the idle higher so that you can get your timing correct.

THANKS BRO!!
You save my day!

Ill try this procedure and Hopefully the marks stay Still enough so i can ill set right to 15.

Thanks again

Thank u sir for the Info... I apreciate that.
I Have a CALUM Basic Daughter board with a program that Calum sent me.
Ill try the procedure and see what happens i hope i can put it on 15.

I got one question: If i set the idle higher than FSM suggest(750rpm) to the point where the idling is smooth enough, that doesnt affect the reading of the timing??? i mean doesnt the timing changes when you accelerate??

Timing changes upon load, ie TP afm reading and air temp. So throughout your ecu map different rpm points will have an ideal timing mark -the ecu adjust the base accordingly.


With yoru question about idle, no it wont affect the base timing.

i was going to rasie the idle to set the timing but i read that the engine needs to be at stock idle before you set it, iircc i read that in the fsm

False. Just raise the idle a bit to get rid of the lope, and set your base timing. Easy peasy. Mine felt best with 17* base timing with my S4's on a stock ecu.

^^Same here. I made better power on 17 degree and stock ecu.