11.6psi 107% Duty Cycle! - Page 2 - NoPistons -Mazda Rx7 & Rx8 Rotary Forum
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Old 06-26-2004, 01:13 PM   #11  
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Quote:
Originally Posted by RETed' date='Jun 26 2004, 07:45 AM
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
injector m/s was 10.7. No rpm or inj m/s spikes.

I did see like an inj m/s of 12 when I hit 12psi.
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Old 06-26-2004, 01:28 PM   #12  
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Originally Posted by 1Revvin7' date='Jun 25 2004, 06:52 PM
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.
Don't trust those calculators to give you HP. I once hit 75% duty cycle with

4 1600 cc injectors. I just plugged that into the calculator and it said 691.6 flywheel HP. That's not even close.
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Old 06-26-2004, 03:55 PM   #13  
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Originally Posted by 13BAce' date='Jun 26 2004, 12:28 PM
Don't trust those calculators to give you HP. I once hit 75% duty cycle with

4 1600 cc injectors. I just plugged that into the calculator and it said 691.6 flywheel HP. That's not even close.
This is true, there are a lot of variables that I don't know for sure, ie: bsfc...
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Old 06-26-2004, 07:58 PM   #14  
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Originally Posted by 13BAce' date='Jun 26 2004, 10:28 AM
Don't trust those calculators to give you HP. I once hit 75% duty cycle with

4 1600 cc injectors. I just plugged that into the calculator and it said 691.6 flywheel HP. That's not even close.
they use a bsfc that made sense when people thought the stock ecu only did about 63% injector duty, turns out the stock ecu runs over 90, so the bsfc in the calculators is off. instead of .65 its more like [email protected] 10's afr
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Old 06-26-2004, 08:46 PM   #15  
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Originally Posted by j9fd3s' date='Jun 26 2004, 06:57 AM
you can set the haltech bars a lot higher in ms than is actually available at that rpm.



ive seen 130% before, oops
Ah, I assumed you knew the limits of fuel injector pulsewidth versus RPM's.



Remember 8.5ms @ 7kRPM!!!





-Ted
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Old 06-26-2004, 10:10 PM   #16  
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Originally Posted by RETed' date='Jun 26 2004, 05:46 PM
Ah, I assumed you knew the limits of fuel injector pulsewidth versus RPM's.



Remember 8.5ms @ 7kRPM!!!





-Ted
yeah seths car was 130% before we fingered that out, now why its 130% @6000rpm and 8psi is the real boggle, could it be making [email protected] 8psi and 6000
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Old 06-26-2004, 10:53 PM   #17  
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So whats the max hp anyone has seen on the stock fuel on the dyno?



My calcutions were off, @ 12psi I see 107% duty cycle....
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Old 06-26-2004, 11:20 PM   #18  
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dunno we'rd dynoing the cosmo t2 soon, 100% stock s5 t2 fuel
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