Finally dynoed the Bonnie. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-04-2005, 10:03 PM   #1
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Default Finally dynoed the Bonnie.

So, I had the Bonneville dynoed at the car show we hosted at my school today, and did all right. For some reason the engine wouldn't rev higher than ~4700 without hitting some sort of limiter even though I've run it as high as 5700rpm at the track. We also weren't able to get on the gas until the revs were around 3800-4000, past peak torque, without the car downshifting. The runs were done in 2nd gear since 3rd goes past the 129mph speed limiter on the car.

Anyways...
180.4whp @ 4679rpm; the power was still building before it hit the limiter so the dyno guy figures around 195whp if the engine would've kept going.

223.7lb-ft @ 4007rpm; I figure 230-240 back down at the ~3200rpm peak torque.

Not bad for a nine year old car with 105,000miles in need of an oil change.
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Old 12-04-2005, 10:05 PM   #2
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thats not bad wheel HP at all, considering your engine is rated at 240 Crank HP from the factory
It downshifts at WOT to get back into a higher power ban, which, really helps on the highway when u need to make a WOT pass.
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Old 12-04-2005, 10:10 PM   #3
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Downshifting is a no-no on a dyno though. :( This was also the third pull. They were done back to back with no cool down, so everything was a little heatsoaked. What'* great is that the first dyno pull registered 344.3lb-ft.
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Old 12-04-2005, 10:14 PM   #4
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If only that were true eh..hahaha..bye bye front tires
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Old 12-05-2005, 12:46 AM   #5
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you needed to keep the shifter on 2nd....
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Old 12-05-2005, 01:23 AM   #6
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i think i will get to dyno my car for my engine performance class...... once my tranny is rebuilt ,of course
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Old 12-05-2005, 09:59 AM   #7
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Quote:
Originally Posted by 1993 SLE
you needed to keep the shifter on 2nd....
We did. Looking back over the graph, the engine cut out at a similated 129mph once corrections were made for the gear ratio. The runs were done on a dynopack instead of a rolling dyno. Would that make any difference in what the car'* computer is seeing compared to running on the street?
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Old 12-05-2005, 02:13 PM   #8
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Good job. I don't know how accurate dynoes are though. These engines have such HUGE differences in dyno results. Case in point; you're engine is stock as was mine when I did a dyno pull. I dynoed 209 whp, you dynoed 180 whp. However, we both have the same 92mph trap speed in the quarter. One of our dynoes was way off.

BTW- does 60ft have anything to do with trap speed? I know it affects you're ET.
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Old 12-05-2005, 02:53 PM   #9
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My 180hp wasn't at 5200rpm where our peak horsepower occurs. All of the dyno guys agreed that with the way the graph pulled we should have seen ~195whp or around 250 crank horsepower.

I'm wondering about the accuracy of the dynos though. On the time in my sig, my 1/8 mile was at 9.625 @ 73.08mph. What was yours? I'm just wondering how much each car picked up in the back half where horsepower matters most.
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Old 12-05-2005, 08:18 PM   #10
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The differance does not suprise me. Those are very different dyno setups.
It may not seem logical but different setups both calibrated will give very different results.

When comparing numbers the best is numbers from the same dyno, next is numbers from the same make and model dyno and, last from the same make.

If you run the same car on a Dynopak, a Mustang and, a Dynojet back to back you will get three different numbers.
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