Thread: LPFP Tech info
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      12-25-2012, 09:43 PM   #12

Drives: X1, 335i
Join Date: Sep 2006
Location: SF Bay, CA

iTrader: (0)

Hi guys-- Made a mistake on the first post which has been corrected. Accidentally used the flow numbers from a different Walbro pump. Too much eggnog With the correct flow numbers used, the relative flow differences between the 3 approaches are even greater. The basic gist of things is that keeping the factory pump in there (and not replacing it) and running the Walbro E85 pump in-line means that:

1) You are not sacrificing pump output to feed the venturi jet. Which means more fuel flow to the engine.
2) You are keeping both pumps running at a lower pressure ratio which is especially important for the Walbro pump which is not designed to run a differential pressure of a continuous 72psi. This means longer lasting pumps.


Last edited by OpenFlash; 12-25-2012 at 09:50 PM.