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

Originally posted by warmonger:

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1.) What boost do you see at 3000 rpm on your engine? Specifically, I would like to know what the boost pressure is in 1K rpm increments from 3000-7000 so I can use that in the comparison.

I will have to do some data logging for you, which is no big deal as I would like to know this myself... I am only seeing 6PSI @ 7K RPM's.

2.) Did you do any head work to the 3L oval port heads?

Not a single bit

3.) What did you do with the secondaries from the stock computer? Did you turn them off or what? In your graph you have a very small customary spike at 3650 rpm where the secondaries are supposed to be. Is that residual from the stock timing curve?

The IMRC is still plugged in and in place... We have "ghetto-rigged" the actuator to a spring to fool the computer into thinking there is real resistance. I am using the E0 EEC so I think there is a residual effect on the timing curve.

4.) What boost pressure do you have at 36-3700 rpm?

I seem to build about 3PSI at 3K and it starts climbing at about 4200RPM's, IIRC.

5.) What exhaust manifolds, type of exhaust and diameter of piping?

Stock exhaust manifolds with a little mild porting. I, of course am fully gutted of cats.

6.) Where is the intake air filter located, engine bay or fender?

I have the fancy fandangled Keith Custom Fender Mount Air Intake. It sits just above the left Foggie.

Sorry for the barage of questions, I'm finally on leave and can afford to sit down and do some data correlation between your engine and mine.

I'm comparing torque, boost and power at various rpm. Its a good comparison because we both had 91 octane fuel from the same area and used the same dyno.
Our engines have different head designs but essentially the same chamber size and valve size. i.e. similar chamber and ~equal compression of 10:1.
Same type of fuel system and same type of cams along with the same size throttlebody at that time too.

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I am interested to see what you come up with. No apology needed for the questions, as I am happy to supply the answers. I know that my setup is not ideal, yet, but it will be soon!