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Re: 635 ignition upgrade (archive)
[ Follow Ups ] [ 6-series (E24) Message Board ] [ Msg. Board FAQ ]
Posted by dd on March 26, 2001 at 09:51:40:

In Reply to: 635 ignition upgrade posted by Hamish on March 24, 2001 at 20:44:57:


I have a turbo on a 635 and have detonation problems. I need to retard the ignition timing. Anyone know about any kits to install new timing system.

There is supposed to be a "fuel quality" switch on the motronic that will retard timing a few degrees. It is mentioned on this site:(http://www.unofficialbmw.com/all/motronic/all_fqs.html)
I'm running an MSD ignition (6AL) on my turbo and it seems ok as long as I run it kind of rich.
I think it will detonate more when the head gets really hot so a richer mixture might help. Also, a big intercooler or lower boost could help the situation. A wider plug gap will retard timing slightly, but may also give a shorter hotter spark. Maybe Bob or someone with more technical knowledge can help more.




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