OK. I just got home and on my way raced an 86ish supra turbo. I am stock 12a with lsd, emmisions out, A/C is gone, and straight thru exhaust... I lost, didn't really expect to win. 1st gear I was beside him until around 5500 rpm, then he was up half a car, by the time I'm done 2nd, hes about 1.5 cars up. I imagine the reason he pulled harder during higher rpms is the turbo. All and all, a learing experience...but I have questions now.

Like....

After removing the rats nest, I've read on this site that some people beleive that the vacume advance doesn't work right at higher rpms, or doesn't work at all.... Is this true that it does not work?

If that is true, then should I be running the timing advanced at all? Right now I have it set right on the line, so I guess thats 0 degrees, right? When I think about it, when accelerating, at around 5500 - 6000 rpm, it seems the rpms stop climbing as hard, is that normal?

 

Vacuum advance has no effect under hard acceleration as there is no vacuum at wide open throttle. Timing should be set with the vacuum advance disconnected.

 

Is there any point in running advanced timing?

 

you need more to stay up with that

 

More what? To stay up with what?

 

you can advance the timing a little if you want... it might give you a little help. i run my bridgey with about 10' advance on the leading and about 5-7' on the trailing. but when i set it i dont use a timing light, i just listen to the engine. when it sounds good i check with a light to make sure its not way too advanced or anything.

the setup i have atm gives a nice steady brapping idle at 2000rpm anything under that and it doesnt sounds right


so back to the moral of the story. if its stock, keep all the vacuum advance hooked up, and maybe just advance the dizzy by a few degrees and listen to what sounds good.

-James

 

What is it that you listen for when you are setting your timing? I believe my car runs smoothest, at idle, when the timing is set on the marks. I'll mess with it later on today.