Adjustable timing on M42 engine?

[16v of E30]

According to this info:
http://http://www.r3vlimited.com/tech/318is/318is.htm

you can adjust the timing of the m42 engine +/- 6 degrees.

anyone know where i can find some info on doing this?

[christophbmw]

if you are talking about the cam timing i have done it (link does not work for me). you cannot go more than +/- 5 degrees otherwise the ecu will see this (via cam, crank sensors) and de-tune the engine, put the redline at 4500rpm. if you go less, say +/- 3 degrees it is pointless. all you are doing is moving the powerband either lower in the revs, or higher. no real gain, the best setting is the factory setting. search it in the forum here, i did a good writeup on the subject a couple of years ago.

[16v of E30]

cool thanks...

[roundel318]

no wonder the factory left it that way:)