Question about injectors on EFI'd 10 valve cars quattro digest, Vol 1 #3238 - 15 msgs
mlped at qwest.net
Sun Apr 7 16:58:59 EDT 2002
I don't know about the stock 3B injector specifically, but based on actual
RC Engineering's tests, the UrS4/6 stock injectors have been tested / rated
at flowing 280 cc/min and
the RS2's at 360 cc/min, using, per RC's preferred procedures a "standard
test" pressure of 3 bar (43.5 psi.) I've no idea what or where the 10 valve
engines FI are rated or have tested at.
The fuel delivery rates under stock operating conditions I guess are a
little closer together than the 360cc vs. 280 cc difference suggests, since
I think the UrS4/6 uses a base fuel pressure of @4 bar, while the RS2 I
think is set at @ 3.8 bar?
I think that works out to something around a 25% fuel delivery rate
How does a 25% fuel difference correspond with, or does it to the reported
factory stock 3B/UrS4 vs. RS2 hp and torque differences?
~From: JShadzi at aol.com
~Date: Sun, 7 Apr 2002 13:05:15 EDT
~Subject: Re: Question about injectors on EFI'd 10 valve cars
~To: mswanson at mswanson.com, dandwyer at hotmail.com, gerard at poboxes.com,
~ quattro at audifans.com
~[ Picked text/plain from multipart/alternative ]
~Depends what system you are using, realistically you can have a
~good idle up
~to about 400cc or 38lbs or so, after that idle speed needs to
~raise a little
~to get a good idle. I'm using 50lb injectors, almost 520cc or so, the car
~idles wells at about 1k to 1100 rpm, any lower gets a little
~lumpy. Stock 3B
~injectors are about 300cc, RS2 are about 15% bigger I think.
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