'85 GSL-SE 13b RE-EGI

Hrm. So, There are two markings for timing, one for leading and one for trailing, now if I were to advance, how do I know how far I'm going? .... ? with only 2 markings it's a little iffy

And, advancing timing leads to gains where, low-end, mid-range, or top-end?

 

advance gains low and mid but mainly mid. you also have to watch advancing too much since your vacuum will advance it as you hit the throttle. that is of course unless you killed the vacuum advance. as for marking the pulley, there is a website on that. can't remember were though.

 

pft, I'll just reset it to stock

 

Stock timing is for pussies.

The pulley is really easy to mark as the circumference is 360mm... so 1mm = 1* obviously. On mine I have it marked in 5* increments from 10* BTDC to 30* BTDC.

When setting the timing for total advance you have to disconnect the vacuum advance and rev the engine up to 4000rpm. It's actually better to leave the vacuum advance disconnected for good as it allows you to run high total advance without the possibility of going too high while under both vacuum and mechanical advance. Most stock to street-ported engines like about 25* leading and 15* trailing give or take a bit.

 

uh, isn't vacuum advance a good thing?

 

The vacuum advance is there mainly for emissions reasons and has no effect on performance as there's no manifold vacuum at WOT... so most people get rid of it.

 

I agree, that's what I did, no vac advanced.

 

so did you just plug the hoses and go from there?

 

plug the connections at the carb base or where ever and leave the modules on the carb uncapped.

 

carb? RE-EGI man

 

should be a carb, lol. damn, asking me to reread the whole thread. ok, where ever covers the re-egi part.

 

Pall Yaw recomends
24 leading
16 trailing advance at 4000 rpm

 

I know this is a late addition to the thread but Racingbeat recommends the following for stock GSL-SE 13b EFI

Leading : 2.5 BTC
Trailing: 12.5 BTC

Adjust in 2 degree increments, leading first, then trailing.

You won't get much power gains from adjusting the trailing.

F.

 

Sorry that was

L: 2.5 BTC
T: 12.5 ATC

F-

 

Ok yeah, I'm a newbie here but for some reason when I try to set the timing at 4k rpm, The trailing seems to be ahead of the leading, regardless of where I move the vac advance. I made a mark 24 deg after (clockwise) the leading (yellow mark) which I think is correct, set the leading to that mark with the vac advance unhooked and carb plugged, then tightened the dist and hooked vac adv back up, switched timing light to trailing side and i'll be damned if I can't get it behind the 24 deg mark, even with the vac advance pushed all the way in. Any help or comments would be much appreciated, thanks.

 

Oh yeah I've got a stock port 12a, rats nest and air pump removed, full RB street port exhaust, if that helps. Thanks