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HybridZ

Z31 fuel pump flow...engine dets under boost


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So my Z detonates under boost. Checking fuel pressure, it can do 30psi idle, 37psi 0"Hg/psi, and at 3psi of boost it was pulling 42psi but detonating!

 

I checked fuel volume, and it does 67LPH at 30psi and 87LPH at 40psi...has anyone done a volume test on the stock pump before? These numbers seem a little low to me :-\

 

I have a Walbro 255 to go in regardless, but I'm curious what others think about those volume numbers.

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