[urq] More Weird UrQ Behavior - fuel starvation

[Cody Forbes]

PS, remember that fuel pressure increases directly proportionally with  
boost. 40psi base pressure at 2bar boost is 68psi of fuel pressure.  
You still need a relatively high pressure pump for some head room.

-Cody (mobile)

On Mar 28, 2010, at 12:32 PM, Ingo Rautenberg  
<ingo.rautenberg at gmail.com> wrote:

> Could the solution be to (gasp) install a lower pressure pump  
> instead, due to the considerably lower EFI fuel pressure  
> requirements, which should lead (theoretically) to less cavitation  
> as well?
>
> Ingo
>
>> On Mar 28, 2010 12:18 PM, "Cody Forbes" <cody at 5000tq.com> wrote:
>>
>> When it comes to fuel pump output flow is inversely proportional to
>> pressure. When you decrease the pressure that the pump has to work
>> againt you increase the volume of fuel that the pump moves. Since the
>> engine is using basically the same amount of fuel you end up with  
>> more
>> volume being returned to the tank.
>>
>> This is why the fuel pump that is stock on a 5000tq, designed to work
>> at almost 100psi, is the fuel pump of choice for racers and high
>> performance street cars everywhere. When used in EFI systems the flow
>> rate of this Bosch 040 (or 044 in out of tank version) pump is one of
>> the highest flow pumps on the market.
>>
>> http://www.boschfuelpumps.com/ for specs.
>>
>> -Cody (mobile)
>>
>> On Mar 28, 2010, at 11:16 AM, Grant Lenahan <glenahan at vfemail.net>
>> wrote:
>>
>> > OPK, so it sounds like ( for mysterious reasons) that the EFI
>> > systems have a higher proportio...
>>
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