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morghen
Joined: 21 Jan 2005 Posts: 8884 Location: Romania
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Posted: Sat May 06, 2017 6:05 am Post subject: |
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I can confirm that the AF allen screw does change the overall mixture, not just the idle mixture.
The plugs on my 931 were grey/white...that's lean and the idle was lumpy.
I adjusted for more fuel and the plugs are brown + black...idle is steady and pedal response is improved.
I have to get a wideband kit for this car as well soon. _________________ https://www.the924.com |
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Carrera RSR
Joined: 08 Jan 2010 Posts: 2309 Location: Somerset, UK
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Posted: Sat May 06, 2017 5:27 pm Post subject: |
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But it will be linear through the whole range. Rich idle means super rich at WOT. The WUR is the place to change idle mixture from top end. Boost enrichment device is where you can manage mid range when coming on boost.
Or go EFi _________________ 1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252 |
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morghen
Joined: 21 Jan 2005 Posts: 8884 Location: Romania
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Posted: Sat May 06, 2017 10:13 pm Post subject: |
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Yeap, that's right.
I'm going to install EFI on my red 924...not sure weather this year or the next...but I do plan to in the near future. _________________ https://www.the924.com |
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Dutch924-racer
Joined: 23 Jul 2007 Posts: 1077 Location: The Netherlands
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Posted: Sun May 07, 2017 5:07 am Post subject: |
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Idle is now about 14, on boost also arounnd 14.
Cruise stays about 17. Is that a problem ? _________________ 937 trackday car
Series 2 engine
951S turbo and intercooler
Fast road camshaft
Forge recirculation valve + boost controller |
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Carrera RSR
Joined: 08 Jan 2010 Posts: 2309 Location: Somerset, UK
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Posted: Sun May 07, 2017 5:57 am Post subject: |
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Idle and cruise should be 14.7 or slightly richer. Wot on full boost should be 12 or richer. Most stock 931s will be circa 10 to avoid det _________________ 1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252
Last edited by Carrera RSR on Mon May 08, 2017 7:35 pm; edited 2 times in total |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Mon May 08, 2017 8:57 am Post subject: |
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Dutch924-racer wrote: | Idle is now about 14, on boost also arounnd 14.
Cruise stays about 17. Is that a problem ? |
Something is definitely amiss. I would start by looking for air/boost/vac leaks in the intake tract. You should be getting a steady 17Hg of vacuum on fully-warmed-up idle. If it's less, you have a leak somewhere and need to find it. _________________ erstwhile owner of just about every 924 variant ever made |
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