Need a tune up spec for a 4000Q

[Huw Powell]

> In an attempt to get a better timing curve on my turbo motor with 034
> controls I put a 4000Q distributor in.? It has vacuum and centrifugal
> advance.? The 034 I have only does 30 degrees of retard and this is
> not enough.? Anyway with the new distributor in I can get a larger
> range of timing and hopefully tune for all situations.? Problem is I
> don't have a spec for what the initial set up should be with this
> unit on a stock NA engine.? With the vacuum advance unhooked I set it
> up for about 15 degrees advance at 1000 rpm, how close is this to the
> book numbers.

That's pretty close - stock on n/a engine is 6 deg BTDC (at idle, ~7-800 
rpm), people often jack that up to 10 - 15 or so for a tad more power - 
whatever they can get away with with no knocking (and no power drop off).

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/