Contour Enthusiasts Group Archives Forums Modifications Forced Induction Rev. Po'Jay dyno

Jason,

Without seeing the A/F curve we have no way of knowing if the injectors went to 100%. If they did they would go static open and the A/F curve would actually go rich and then lean out rather fast...I have a good example somewhere.

Seawulf:
Sorry man but the BSFC of our engines does not follow those old estimates. Our engines for whatever reason are way more efficient than that. 19# injectors are dyno proven to provide 240 wHP on our engines without being maxed out.
I had a duty cycle of 69% at 7000 rpm with over 210 wheel HP on 24# injectors.
By the way, the SVT contours with return style fuel system run 45psi idle and 55 psi wide open throttle. The ford injectors are rated at 39 psi and a certain duty cycle that I forget. Doing the conversions means that 19# injectors act just like 21# injectors at 39 psi.

You can quote the "Rules of thumb" all you want and so did we last year until dyno after dyno proved it wrong, along with all the driveability issues people were having.

Just remember that I am running rich right now, pushing 350 wheel horsepower on 8.5#'s of boost (Yes I know whats in my sig is OLD) with 36# injectors and a Walbro 255LPH fuel pump. IT is too rich since I tuned the car with the stock pump and it was running out of steam above 6K rpm. With the new pump A/F was much richer and steady all the way to 7K.
Say what you will but proof is proof.