LO3 TBI Total timing advance, how much?

[olbap]

Well, I guessed that because Ive got a buddy running a carb setup with
mechanical advance, smaller cam, swirl port heads, weaker exhaust, same type
of car, same displacement etc etc and he tells me his total advance is in
the low-mid 40s. No knock either. He could be confused i suppose, i dunno.

Still, just to satisfy my curiosity, any idea on the amount of total advance
the stock setup gm programs in there calls for?  I know theres alot more to
setting up the correct timing advance curve on a motor and than just total
advance but i doubt anyone is going to mail me advance curve graphs so i
kept the question simple


At 03:13 PM 2/6/00 -0500, you wrote:
>I never, ever, look at timing that way.
>Deep underneath things, you'll now want to try that and might ignore what
>actually works best.  High 40s, I hope you mean maybe at cruise, with EGR.
>   It's all testing, it's what the engine wants/needs, not something that
>you've thought of.  "If" they match pet your ego, and put it away.  More
>tuning F--- --- are caused by someone thinking that it should need
>something, and they ignore what the engine is telling them.
>  The other problem is once you reach the end of tuning to the gas avilable
>is stopping, sometimes there just isn't anything you can do.  In some
>applications, you might try some remounting off the Knock sensor, but you
>can dig a deep hole real fast.  Remember plug cuts.
>Grumpy
>
>> Im thinking my current setup would want total timing in the upper 40s,
>just
>> wondering how off it is right now.
>> thanks,
>> Pablo
>
>
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