[s-cars] Fuel Delivery Questions

[Sean Douglas]

Brian:

The fuel pressure changes depending on the pressure (boost) being
applied to the FPR. I did some testing of this in the summer by applying
a known pressure to the FPR and measuring the pressure in the fuel rail
while running the fuel pump. I was trying to decide if the fuel pump
created enough pressure to run the injectors at the desired flow rate.
>From what I recall, the measured fuel pressure was between 96-98% of the
target and there was a noticeable improvement after I relayed the fuel
pump.

>From what I've read, the flow rate of the RS2 injector is 360 cc/min at
3.0 bar and 415 cc/min at 4.0 bar.

This thread from Scott Justusson may help shed some light on the
calculations;

http://forums.audiworld.com/s4s6/msgs/39294.phtml

Sean

Sean Douglas
1997 Audi S6//RS2-spec
1990 Audi 90 quattro 20v


> -----Original Message-----
> From: s-car-list-bounces at audifans.com 
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Brian Powell
> Sent: Monday, December 20, 2004 12:23 PM
> To: s-car-list at audifans.com
> Subject: [s-cars] Fuel Delivery Questions
> 
> 
> Just trying to do some calculations so that I understand what 
> is happening in our cars. The stock FPR is 4bar, correct? 
> What is the normal pressure that it should keep it at during 
> wide open throttle at 1k rpm increments? Does it try to keep 
> it at a constant 4bar?
> 
> Also, what is the flow rate of the stock injectors at 3bar and 4bar?
> 
> Thanks.
> 
> -- 
> Cheers,
> Brian
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