[s-cars] RS2-related fuel pump questions
mlped at qwest.net
Tue Jul 6 10:51:14 EDT 2004
I know this is a late reply, but I notice the Bently/Dymant have a fairly
comprehensive fuel injection test & checking protocol (Dyamant Sections
@24-11 ?? Bentley volume #1, Section J) which includes a set of tests and
expected values for pressure (J 24-13 etc.) to be checked both with pump
running (should be between 4.0 & 4.2 bar (58-61psi) and immediately after
pump is switched off, 3.4 to 3.7 bar (49-54 psi); expected fuel pressure
drop with engine running; expected residual pressure values after 10 minute
shut down for cold vs. hot motor, followed by a section of fuel injector
quantity and leakage tests (Bentley Sections J 24-31 & on, involving glass
Have you gotten to the point where all of these have been done, and still
think you have a fuel delivery problem?
>From: s-car-list-bounces at audifans.com
>[mailto:s-car-list-bounces at audifans.com] On Behalf Of Dave Forgie
>Sent: Monday, July 05, 2004 10:23 PM
>To: s-car-list at audifans.com
>Subject: [s-cars] RS2-related fuel pump questions
>Joey: Thanks for the hint re: FUEL PRESSURE REGULATOR.
>Unfortunately, I just replaced it (and the fuel filter) with
>no real improvements. The FPR is a new OEM 4.0 bar, i.e. I
>should get 4 bar over manifold pressure at all times, i.e. the
>injectors always see a delta of 4 bar so the only variable is
>duty cycle. (And the injectors are the green Bosch "RS2"
>injectors, RS2 MAF, etc.). Since nobody would confirm the
>recent GP newly manufactured RS2 turbos aren't flowing more
>air than the NOS RS2 turbos, then I have to suspect the 091 G
>OEM fuel pump isn't up to it. Hence looking at the 044 Motorsport pump.
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