FYI - How much HP the AA3 fuel system can take

[Payne]

From TMI- Fuel pump is TI Automotive – made in France - PN 19780189932
Ariel UK tested this pump at 225L/hr


225L/hr is 367 lbs /hr : http://convert-to.com/conversion/flo...line-flow.html


K-series need .5-.7 lbs / hp: http://www.k20a.org/forum/showthread.php?t=41102


So the OEM fuel pump will *very* conservatively support 500hp in a FI setup with the right injectors (1000CCs).


With e85, I don't know the exact conversion, but 400hp should be fine.





Brake specific fuel consumption (BSFC). BSFC is a measure of an engine's efficiency. It is the rate of fuel consumption divided by the rate of power production. BSFC is specific for the reciprocating engine. It is not weather dependent. The formula for gasoline powered reciprocating naturally aspirated engines is 0.5 lb/(hp·h). Generally, SFC within a particular class of engine will decrease when the compression ratio is increased. That is to say, less energy from fuel will be lost to heat, making the engine more efficient.
A good general rule of thumb for gasoline engines is:
* For naturally aspirated estimate BSFC to be 0.4 to 0.5
* For nitrous estimate BSFC to be 0.5 to 0.6
* For forced induction estimate BSFC to be 0.6 to 0.7

[Gage]

Ah. Thanks for the useful technical information.

[Payne]

Also, I'm told the Fuel Pressure Regulator on the AA3 is set to 55 PSI.

I'll be running Injector Dynamics 725CC injectors. Should see around 60% duty cycle on 91 octane, and 75%ish on e85 if I go that way.

Jason