2nd Generation Specific 1986-1992 Discussion

11.6psi 107% Duty Cycle!

Old 06-25-2004, 09:52 PM
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Walrbo fuel pump, 4x 550 cc cleaned injectors



@ 11.6 psi in 4th gear @ 5200rpms I hit 107.8 injector duty cycle.



Using a fuel calculator I guess I have 270rwhp



using a .66 bsfc 15% drivetrain loss



afr was 11.0 then just went lean as all hell and I let off.

intake temps were high, 120-130 a WOT.







So whats up with all the haters thinking you can't hit 300rwhp on the stock turbo? I know its not a dyno graph, but soon I will get one.
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Old 06-25-2004, 10:01 PM
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!!!











Dude, I owe you a drink or something LOL
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Old 06-25-2004, 10:03 PM
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And I know its fast because I just did this:

https://www.nopistons.com/forums/ind...howtopic=43437
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Old 06-25-2004, 11:36 PM
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107% duty cycle? How do you get over 100% duty cycle?

and at WOT your a/f was 11.0? You need to get that on a dyno and check get some graphs up
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Old 06-26-2004, 12:33 AM
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what's wrong with 11:1 ?



Looks like your getting the car sorted out.
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Old 06-26-2004, 01:02 AM
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nothings wrong with it, i just want to see some dyno graphs of it
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Old 06-26-2004, 01:43 AM
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I got the 107 from the e6k......
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Old 06-26-2004, 01:47 AM
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The injector is static at ~90%. Anything over that, and it just fails to close. 107% is possible because the engine needs the injector to be open that long to give the required fuel, but its physically impossible at the injector.



Ive seen 120%.....oops.
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Old 06-26-2004, 07:45 AM
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Haltech E6K extrapolates duty cycle by comparing fuel injector ms versus RPM.

If you have glitches in the RPM, it's possible to have inaccurate duty cycle readings, like those over 100% like that.



Recheck the datalogs, but check the injector MS instead of DC.

Also, check the RPM's, as I bet you had a spike in there.





-Ted
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Old 06-26-2004, 09:57 AM
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you can set the haltech bars a lot higher in ms than is actually available at that rpm.



ive seen 130% before, oops
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