MembersPage/MarcellGal/PowerAndTraction/FuelDelivery (2007-04-04 17:28:44)

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Injector

Brave men do like this: in audi 5cyl 20vt thmb rule: cc/per injector = max power in hp. 440cc = 440 HP

I think it's brave. But with tuned boostcontrol it can be tried. If going up slowly, one will know when running out of injectors flowrate.

I think there is an error on http://www.rceng.com/technical.htm they swapped the BSFC for turbo and supercharged. Turbo is better (lower). Below I calculate with BSFC(gasoline)=0.55l / (HP * l), consistent with some other sources.

examples

Jorgen's note: If the stock injectors is 350cc the 415cc injectors in the webshop is almost identical in size. (good point!) 350cc/min@3bar is same as 404cc/min@4bar: 350 * sqrt(4/3) = 404.15 Then we can use the stock injectors instead, at 4bar fuel pressure of course.

Jorgen will check if he finds a 4bar regulator for me (isn't it just a stiffer spring inside the FPR?).

Safe injector sizing

If purchasing new injectors, it is best to have it sized high enough to be enough for sure, for the times to come.

The injector sizing should be rather 420 HP with K26/27 turbo (even if we'll more likely get only 370 HP).

Which is the better choice ?


Fuel Pump

Kalske's hints in this case is to use 044 pump in PnP install inside fuel tank

First two are the most important ones, they are used fitting the pump in place of the original one. Banjo, seals and nut are used for fuel line connection.

It is weird that banjo is used inside the tank, for the fuel pressure line. Doesn't the 90 degree break obstruct the flow ?

http://www.avtoshop.net/audi.php?mdl=141&bildid=2670005F&grp=9&check=16