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Old 06-28-2017, 01:12 PM   #6
LibertyHill

 
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Drives: 16 2SS 6MT NPP MRC / 15 K1300S
Join Date: Mar 2016
Location: NW of Austin
Posts: 1,034
Quote:
Originally Posted by toohighpsi View Post
It's OK if the low side falls off some, it's simply a transfer pump and has no effect on the HP pump unless it gets pretty low. Using the Big Bore HPFP with the stock low pressure side I ran up to 700 RWHP before replacing the low side. I hadn't run out of fuel on the high side, but low pressure was down to about 20 psi and I didn't push it any further. Switching to the ZL1 got me back to about 45 psi at 730 RWHP.
By Big Bore you mean the LT4 HPFP AND injectors right?
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