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Jim2 Jim2 is offline
7.0:1 > 11.3:1
 
Join Date: Oct 2003
Location: Calgary
Posts: 1,879
Garage
I can't speak accurately about the 3.2 because it's over 9:1 but on my 930 SDS installation I ran total timing of 29 and started boost retard 2.76psi (-1 degree) and ramped up to -7 degrees at 14.1 psi. I'd think you are going to need more retard (starting sooner) because of your compression versus my 930 which was 7.0:1 but you need to be a little cautious because increased retard also increases exhaust gas temperature rapidly. This is more of an issue with extended open throttle periods like track use. I was able to run 1 bar on 91 octane but again this was with 7.0 cr.

Do you have a wideband o2 meter to tune AFR's?

If you would like my complete sds value table shoot me your email address in a pm.

The project I'm working on right now is an SDS turbo 993 which is 11.3:1. This is going to be a challenge, to say the least.
Old 05-30-2010, 07:48 AM
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