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gegge · Joined: 27 Jul 2007 Posts: 1124 Location: Sweden

Does anyone have a AFR graph going from 3000 to 6000 rpm?

Measured wideband or other accurate method please.

If I assume 14,7 at steady state after warm up, guessing not completly wrong.
_________________
Carl Fredrik Torkildsen

924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs

Min · Posted: Sat Dec 13, 2014 11:50 am Post subject:

My 924 NA responded the best when i set it to approximately 13:1 afr at WOT

Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.

gegge · Joined: 27 Jul 2007 Posts: 1124 Location: Sweden

Yes, the response improved when I dropped the pressure from the WUR. Could be like carb acc. pump effect wetting the inside of the inlet, but not improving power.

But I think that I am missing the stock numbers. Is the AFR constant over the revrange? By how much is it dropping when flooring the pedal?
_________________
Carl Fredrik Torkildsen

924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs

Fifty50Plus · Posted: Sun Dec 14, 2014 2:11 am Post subject:

I'm running my NA race car at 12.8. It's slightly better than it used to be at 13.1 based on my configuration (stock cam, 9.5:1 compression and header).
YMMV.
_________________
1979 924 NA race car H-Prod SCCA
1982 924 NA race car - Sold
1981 924 Turbo sold
1982 924 Turbo sold
1972 911 E race car - traded for Cayenne Diesel
1975 914 1.8 Building for H-Prod SCCA

gegge · Joined: 27 Jul 2007 Posts: 1124 Location: Sweden

I have this dyno graph, but can´t remember where I got it. Guessing someone here at 924board provided it:

AFR at 12.0 is not bad at all, but dropping down to tenish @ 7000 rpm needs to be rectified.
_________________
Carl Fredrik Torkildsen

924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs

gegge · Joined: 27 Jul 2007 Posts: 1124 Location: Sweden

found another one:

_________________
Carl Fredrik Torkildsen

924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs