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I'll scan and post a copy of my dyno sometime this weekend hopefully. Overall, the dyno session went very well, but it was not without its problems.
The belt started slipping above ~6000 rpms. The plot shows almost linear acceleration, and then a sudden dip in the hp and torque graphs. Standing in front of the car and observing the B&M fuel pressure gauge confirmed this. When the belt started slipping, the fuel pressure also bounced around.
Even with the slipping belt, max hp was around 215 with 162 ft-lbs torque. A/F ratio was measured using an HKS wideband unit, and unfortunately, the results could not be graphed. We saw roughly 12.5:1 over the entire rpm when plugging the sensor in AFTER the catalytic converter (which should show a little leaner than before the cat).
I made a decision to end the tuning session early, as I figured I'd have to tighten the belt to see my max hp numbers. I'll be going back in a week or so to "finish" the tuning session.
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215/162 with a slipping belt isn't too shabby... [img]smile.gif[/img]
Post the final chart when you have a chance, and what are you using to tune fuel?
Chuck
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i just tightened my alternator to supercharger belt. . .I didn't realize there'd be that much slack in it! So now I'm hopeful for higher dyno numbers.
I use a VAFC to tune fuel.
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Do you know what your boost was reading from the belt slip? Assuming your belt was slipping, I bet you'll end up in the 230 +/- a few range given your initial results.
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Yeah. I watched the boost gauge on one of the runs. . . it peaked around 11 psi, but then dropped to about 6 and then wavered between 6 and 7 psi.
After tightening the belt, it peaked at about 11 psi and then settled between 9 and 10 psi. Problem was, when I was sitting on the dyno, I couldn't access the lock nut for the alternator to supercharger tensioner.
I'll be going back in on Monday for 2 or 3 power runs. I doubt I'll be able to use the wideband again, since they'll probably want to charge me another $50 to use it.
<font color="#a62a2a" size="1">[ June 13, 2003 01:13 PM: Message edited by: 217gsr ]</font>
<font color="#a62a2a" size="1">[ June 13, 2003 01:28 PM: Message edited by: 217gsr ]</font>
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do you know what the intake temps were @ on your highest boost levels??
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217gsr
Do you think you had the slipping belt when you ran thar Neon SRT-4? This could have made the difference.....
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Actually, yeah. . .that's pretty likely too. I went back into my maintenance records. The last time I adjusted my alternator belt was when I replaced my alternator, in mid February. [img]eek.gif[/img]
