Hondata

Lots, provided you keep the fuel pressure low and the injectors large.



This graph is the crankshaft power potential at each of the specified fuel pressures with the fuel pump running at 100%. As the pump wears it cannot supply as much fuel. Typically you should allow a 20 % saftey margin. It you reduce the HP figures by another 15 % you will get approximately wheel horsepower figures.

Lets consider this question. You have a Prelude you want to turbo or supercharge. You will be running 10 lb boost with the stock fuel pressure regulator. What horsepower can the stock pump support?

Stock fuel pressure is about 40 psi. The stock regulator rises about 1:1 under boost, so 10 lb boost will give 50 psi fuel pressure. Look at the 50 psi line on the graph. Peak crank HP is 400. Reduce by 15% gives you 340 possible wheel HP. Allow a 20 % safety margin and this makes 272 hp a reliable wheel HP target. This can easily be achieved with 550 injectors a resistor box and an engine management system.

Note also that if you increase the fuel pressure by means of a rising rate regulator that the pump flows a lot less fuel (and heats up the fuel and heats up the injectors).

Happy boosting

Doug




[Modified by Hondata, 8:45 AM 5/21/2002]

ludelvr

so does this mean that because I'm running an 8:1 fum, an inline fuel pump and my stock injectors and a stock fpr, that I'll have low hp figures? If not, what can I expect with this setup? I'll be running 6 psi, turboed. Thanks man.

Hondata

No, this means that if you did not run an inline pump, you would probably lean out and damage your engine. It means also that if you ran engine managment and larger injectors you would not need the FMU and inline pump, and you would run much safer fuel pressures.

Read http://www.hondata.com/techfuelpump.html

Doug


[Modified by Hondata, 10:27 AM 5/21/2002]