S4 / RS4 (B5 Platform) Discussion Discussion forum for the B5 Audi S4 & RS4 produced from 1998-2002

PSA: Bosh Motorsport 5 BAR Fuel Pressure Regulator (WTB and $$$)...

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Old Mar 8, 2005 | 01:39 PM
  #11  
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i don't think i'm going to run one, but I thought I'd share where to get if people want...
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Old Mar 8, 2005 | 01:56 PM
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So are you going to spend a couple extra hundred for a "real" one?
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Old Mar 8, 2005 | 02:00 PM
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i don't think i'm going to use any of the options, just letting people know WTB and $$$
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Old Mar 8, 2005 | 02:08 PM
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Default FPR does what?

How is the FPR related to the fuel pump and sending unit? I think my sending unit is acting up, as the DIS never computes less than 35 MTE and the fuel guage, while seemingly fine at all other levels, never goes into the read on the 'E' side even when the tank is dry (it stops just before the first red hash mark). I think it's mad at me for putting it on the market. :-)
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Old Mar 8, 2005 | 02:14 PM
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Default It regulates pressure for the injectors...

Your issues sounds like the fuel sending unit.

Happened at about 50k in my S4. Replaced it, all better.
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Old Mar 8, 2005 | 02:30 PM
  #16  
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Default Thanks. So the benefit if different FPRs is?

Is it efficiency? Power? Smoother power delivery?
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Old Mar 8, 2005 | 02:33 PM
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Ah, sorry. For more fuel...
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Old Mar 8, 2005 | 02:48 PM
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Default Is there benefit to more fuel across the board, from stock to stage III+?

Or do you really only benefit at a certain level of modification (i.e., stage II and beyond)? I understand cold(er) air is good regardless, but is pumping more fuel into through the injectors good for everyone?
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Old Mar 8, 2005 | 02:48 PM
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Stage 3- and full stage 3 homebrew cars can benefit from it.
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Old Mar 8, 2005 | 02:56 PM
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agree with DocSlow, stock and chip only will likely run worse with more fuel...
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