[urq] More Weird UrQ Behavior

[afinn1]

It's a 044 Bosch motorsport pump. Should handle the capacity. If it  
couldn't then i'd slowly run out of guts and this is a total loss of  
all throttle response. Thanks.

Andrew Finney


On Mar 26, 2010, at 2:46 PM, dgraber460 at aol.com wrote:

>  My first instinct is fuel delivery. Are you using the URQ OE fuel  
> pump? Does it have the _capacity_ to feed a larger displacement  
> motor at sustained high RPM? If the tach stays operational etc then  
> it is likely fuel related. If the tach drops to 0 then it could be  
> an electrical/spark problem.
> Years ago I had an old V12 Ferrari that had 2 fuel pumps. A  
> mechanical on the block, and an electric at the tank. The electric  
> was dash switched for full throttle runs as the other would volume  
> starve.
>
> Dennis
> Denver
>
>
> -----Original Message-----
> From: AF <afinn1 at gmail.com>
> To: urq <urq at audifans.com>
> Sent: Fri, Mar 26, 2010 1:21 pm
> Subject: [urq] More Weird UrQ Behavior
>
> So, at the past 2 track events I've attended with my V8 UrQ I have  
> had a
> weird issue with engine cutout at high rpms, usually in 3rd gear,  
> but on the
> straightaways in 4th gear. They seem to occur during any throttle  
> position,
> like cresting a hill, or accelerating out of a corner, which is  
> somewhat
> unnerving. There are no fault codes thrown at all, which makes me  
> think it's
> a fuel supply issue. Here's the weird thing, I would say it a fuel  
> pump
> relay issue, but wouldn't the engine stall (that's what my old UrQ  
> and Coupe
> GT would do on the highway), but in this case there's no power until I
> depress the clutch after slowing a little and downshifting, then the  
> power
> is all back. The engine never stalls and shuts off! I confirmed it's  
> not a
> rev limiter issue by redlining with moderate throttle input and no  
> issues
> occured. It's definitely at higher RPM though. Does anyone have a  
> thought? I
> thought about relaying the fuel pump, but wouldn't the engine simply  
> stall
> with no fuel supply, or will it simply keep running with the car in  
> motion
> and clutch out without shutting down or turning on all the warning  
> lights on
> the dash?
>
> Any help is appreciated. Thanks.
>
> Andrew Finney
> 1985 UrQ 4.2L ABZ
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