[s-cars] Relayed FP

[Scott Justusson]

 The urq pump is also relayed from the factory, and this is a standard issue mod, not based on theory, it's a known practical application of voltage at the pump vs pump output.  The main reason to do this relay mod is 17 feet of wiring between the factory FPR and the fuel pump can create quite a voltage drop.  Easy to test this improvement, if battery voltage = voltage at the fuel pump = no improvement.  IME with Audis, rarely does the battery voltage = voltage at the fuel pump.  And the difference in fuel pump output is quite significant when voltage drops:
http://performancefuelsystems.com/images/clip_image004_001.jpg

I won't go so far as to say it will *solve* anything, but low voltage at the fuel pump can create running problems under boost.  The good news is with many Audi batteries mounted under the seat, this is a simple and effective mod.

HTH and my .02

Scott J
Relayed fuel pumps aplenty


 

 

-----Original Message-----
From: Cody Forbes <cody at 5000tq.com>
To: Peter Trinidad <pidro13 at yahoo.com>
Cc: s-car-list <s-car-list at audifans.com>
Sent: Mon, Oct 31, 2011 7:35 pm
Subject: Re: [s-cars] Relayed FP


The fuel pump is relayed from the factory. I highly doubt you'll solve pinging 
problems by adding another relay. With a properly running engine in one of these 
pinging means you are burning oil, using bad gasoline, have a bad knock sensor, 
or running too much boost.

-Cody (mobile)

On Oct 31, 2011, at 6:18 PM, Peter Trinidad <pidro13 at yahoo.com> wrote:

> Is this relaying of the FP curing the pinging issue? Especially with an 
aggressive tune/chip?
> 
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