Quote:
Originally Posted by Joshinator99
So JMS at 16.50V did not trip the code while on the dyno, but also lost 20 or so psi low side fuel pressure at 726 WHP. I turned it up to 17.00V and it kept up. Pullied down one size on my Whipple (3.50 to 3.25, still not even close to max blower speed), and I lost 20 psi of fuel pressure at 780 WHP. No code at 17.00V, at least. But I’m done trying to fuel this motor off a single in-tank pump. I need to do something much better (either surge tank setup or triple in-tank like Fore).
All on 93 octane BTW, only 8% ethanol.
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Seems a bit low but your log that you sent me indicated some odd fuel system fluctuations so I wonder if the low side pump you used has issues?
I would expect to see the LT4 in-tank with JMS go that far if not further on 93. My brother's H/C 2300 C7Z is still running the OE in-tank with JMS. It is dropping from 70psi to 55psi on E40 @ 13.5-14psi of boost at the last 2-300rpm of the gear. He is going to try the LT5 ZR1 pump next which is said to flow another 20%.
Anyway at least lowering the voltage fixed the code. Perhaps you can bump it up to 17.2v and still be ok.