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924RACR
Joined: 29 Jul 2001
Posts: 8815
Location: Royal Oak, MI, USA
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 Posted: Sat Apr 27, 2024 11:32 pm Post subject: |
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Actually I'd say #3 tends to be hottest, at least on my NA.
...and now you're seeing why we all like modern EFI... 
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Vaughan Scott
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'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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Raize
Joined: 18 Sep 2013
Posts: 186
Location: Scotland
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| Posted: Sun Apr 28, 2024 8:48 pm Post subject: |
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| 924RACR wrote: | Actually I'd say #3 tends to be hottest, at least on my NA.
...and now you're seeing why we all like modern EFI... |
My AFR curve on full (2 PSI at 2000 rising to 4 PSI at 6000) boost is 13.5 at 2000 RPM, 12.5 by 3000 RPM, then 11.8 from 4000 to 6000 RPM now.
It's not perfect but I'd say it's decent. I have added manually adjustable lower chamber pressure to the fuel distributor so I can increase/decrease the proportional fuel flow just by turning a knob.
Now that the fuel is sorted, I can try and add more timing. |
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924RACR
Joined: 29 Jul 2001
Posts: 8815
Location: Royal Oak, MI, USA
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| Posted: Sun Apr 28, 2024 8:57 pm Post subject: |
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Yeah, that's not too bad for CIS... I wouldn't mind a bit richer, to cover the low end of the RPM range, but agreed, should be decent to roll in timing...
Have fun!
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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Cedric
Joined: 27 Aug 2004
Posts: 2614
Location: Sweden
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| Posted: Sun Apr 28, 2024 10:19 pm Post subject: |
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| Raize wrote: | | 924RACR wrote: | Actually I'd say #3 tends to be hottest, at least on my NA.
...and now you're seeing why we all like modern EFI... |
My AFR curve on full (2 PSI at 2000 rising to 4 PSI at 6000) boost is 13.5 at 2000 RPM, 12.5 by 3000 RPM, then 11.8 from 4000 to 6000 RPM now.
It's not perfect but I'd say it's decent. I have added manually adjustable lower chamber pressure to the fuel distributor so I can increase/decrease the proportional fuel flow just by turning a knob.
Now that the fuel is sorted, I can try and add more timing. |
Thats not bad att all, let it be as it is 
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1980 924 Turbo
www.instagram.com/garagecedric/ |
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