1. Should you set the initial set jumper before adjusting timing? FSM says for idle, but it does not mention timing. But it makes sence to me that you don’t want the ECU making any adjustments while timing the car so why would you not set the initial set jumper?

2. The FSM tells you to do the front leading, then adjust the front trailing. If you have the front leading set, then you move the CAS to set it closer on the front trailing, you have now thrown off your front leading, correct? So what is more important to be dead on, if they do not both match up?

3. What direction do you move the CAS to advance timing? Or waht direction will the indicators be moving?

4. Those of you running 10 PSI+ with a street port, how advanced are you safely running your timing?




Thanks All,


Robert

 

The ECU is constantly monitoring idle speed, so if you adjust the idle without jumpering the ISC, the ECU tries to correct it. But the ignition timing is only dependant on load and rpm, so the ECU will not do anything if you alter the timing, because load and rpm won't change as a result.

 

2. If your leading is right, so should your trailing, it almost a mute point to check both. I assuem if they are off somthing is needing replaced.



still open for the other anwsers though.


-Robert

 

Ignore the jumper...

Ignore the FSM - it's most important to set the leadings only. The trailings can be off if the TPS is not working properly or misadjusted.

Set it at stock and keep it there.

Don't adjust stock timing - you're asking for trouble. A CAS adjustment does an advance across the board, and this is a bad way of running more advance under load.


-Ted

 

Don't you want to retard timing under higher boost, not advance it? But like Ted said, leave it at stock if you have a stock ignition and ECU.

 

just get a computer for your car so you don't have to worry about it

 

Yeah, we wouldn't want Zoom Zoom Boom on your nice black AE!!!

 

Just in case you didn't know......the fsm in the section called Control System(1991fsm, F2-75), says the timing is retarded at idle when warming up........so make sure the car is fully warmed up prior to looking at the timing.

Sorry ...never seen the LEAD spot on and the Trail not spot on. Maybe check out the output of the cas per the fsm at the ECU???? Maybe you'll find something. Maybe ohm out the cas at the ECU?

Timing is set with a timing light, not turning the cas ***** nilly (cheap shot).

 

I wasn't going to ***** nilly it I would get a timing light with an advance adjustment dial if i decided to do it. But by the sounds of it I will leave it at stock. My ECU upgrade has a timing curve adjustment in it anyways (suposedly) I have just read a few posts where people are saying they are getting instant power with just a few degrees advance, I kinda wanted to see for myself is all. But It's not as much more power I was looking to get .. I kinda wanted to see if a couple degrees advance would smooth out my idle at all, I assume its the street port, but my idle is pretty bouncy. 750-950 range.

Thanks all.


-Robert

 

Try adjusting the variable resistor a bit richer for a better idle. Might help. Might not.

 

I have a S-AFC, if I adjust that richer & leaner would that have the same effect as the "varible Resistor" ? Cause if so I have tried tweaking the S-AFC (settings under 1k RPM)... if not I will take a look around and figure out what your talking about.

Thanks,

Robert