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      11-29-2012, 11:55 PM   #13
Second Lieutenant

Drives: 335i e92
Join Date: Nov 2012
Location: CA

iTrader: (3)

Originally Posted by Wedge1967 View Post
I think the Walbro was a good aftermarket solution if your LPFP was actually failing, but I think they found that pump alone was still dropping pressure because it couldn't maintain the surge volume required at peak torque.
Was a good aftermarket solution? Its an OE solution that can outflow the HPFP. It is not dropping pressure anywhere. Terry's RB car on 100% E98 (requires more fueling than 100% E85) is not losing low pressure anywhere in the rev range. That includes peak torque, which btw is not where you would max a low pressure pump at (this happens at peak power). He is making well over 500whp with no meth and the bad bsfc that comes along with stock housings. It seems you have evidence this is not the case though. I'd love to see it and get down to the bottom of this since I am considering upgrading the low pressure system and have been waiting to see the results of both solutions.

That being said, I was hoping for something a little more professional than a booster pump slapped on to compensate for the stock pump. I will wait to pass judgment on this inline booster pump, but to me the concept sounds more like an "aftermarket solution" that doesn't integrate properly with the OE fuel system. If the stock pump doesn't flow enough it should be replaced with one that does. Maybe I am missing something, guess we will see.