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Frank J. Bauer
dassault systemes of America email:firstname.lastname@example.org
Subject: one-cam-sprocket-tooth-advance technique
there should be little debate on the amount of cam advance provided by
this technique. if the cam sprocket has 45 teeth it's 8 degrees, 60
teeth it's 6 degrees, etc. (360 divided by number of teeth)
(of course 45 tooth cam sprockets don't exist - gotta be an even number)
i know the 8V VW has a 44 tooth sprocket which means about 8.18 degrees.
if the audi has the same sprocket as vw (number of teeth, shaft diameter,
key size and placement, etc) there is an excellent adjustable sprocket
available from autotech sport tuning. it can be adjusted +/- 4 degrees
in one degree increments and has an indexing screw to prevent slippage.
this may be more useful for those who will hit the knock sensor with
the 8+ degree advance. theoretically, advance should improve low end and
retard should help top end. interesting possibilities include adjusting
one tooth AND the sprocket for +/- 4 to 12 degrees, but at some point there
may be piston/valve clearance problems and diminishing performance returns.
the piece is about $80 and AST's phone is 714-240-4000 (just south of LA).
disclaimers: got one in my GLI and it helped bottom end noticeably;
no financial interest; YMMV - atmo vs turbo, etc.