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Alan L Alan L is offline
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Join Date: Apr 2006
Location: New Zealand
Posts: 3,261
Thanks guys. We may be getting close to the answer I am looking for. I am seriously beginning to question my fuel pumps as the limiting factor. I think at 1400cc/30 sec (over 6 injectors) this is very close to the 227/30 sec calculation(above) (1360). So it looks like I need to be measuring 1400/30 sec minimum at the injectors. I will check this and the CP at boost. If I am getting 1400 at the FD without 7 bar pressure I seriously doubt I can get near 1400 at the injectors.
Now that I have access to my manual, I see as T77911s notes, there are two fuel pump delivery rates quoted. The 1150/30 sec and for type 68 engine 1500cc.
My engine is actually a type 68 (in an 82 chassis). I am not sure how they arrive at two fuel rates for say a type 60 vs 68 engine. Did they have different pumps?
So at 1400cc FD as I have measured, I may be down on flow. This fits the scenario better than any other explanation. Anyone know why a 68 engine needs more fuel flow? Same displacement and HP as a type 60.
I have a spare (new ) rear pump. Would fitting an 044 pump up front work with the new rear pump fitted?
I am about to try and source some fittings to check the pump differential pressures.
Thanks for the help guys.
Will post some results - hopefully in next few days.
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 10-30-2017, 04:58 PM
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