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Alan L Alan L is offline
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Join Date: Apr 2006
Location: New Zealand
Posts: 3,247
fuel mixture/exhaust colour

Wondering if anyone has any suggestions. Just removed the headers and you can see 1-3 are quite sooty while 4-6 much cleaner burn with #4 slightly darker.
Thought my fuel mix may be off so checked injector calibrations;
#1 = 54ml
#2 = 55
#3 = 54
#4 = 56
#5 = 56
#6 = 56
These were taken at near WOT - which is where the engine is doing most of its work and burning most fuel.
I then wondered if these clours were due to the idle up time - eg unloading from trailer etc on cold start. So did another run at near idle opening;
#1 = 31
#2 = 29
#3 = 25
#4 = 28
#5 = 26
#6 = 30
So there seems to be no fuel pattern that would explain this (dont compare volumes between run 1 &2 - just ran enough fuel on 2nd run to be able to accurately measure.)
Since I use this machine on track only, any lack of efficiency is of interest. Wonder about an air leak on one side (1-3) on boost - would that explain it?
Thanks
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
Old 11-15-2011, 12:38 PM
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