"mr_gofast" (jake_berenshteyn)
08/25/2014 at 13:03 • Filed to: PSA
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"mr_gofast" (jake_berenshteyn)
08/25/2014 at 13:03 • Filed to: PSA | 3
| 10 |
the Hellcat challenger has been quoted at 707 hp and this makes us fans very happy and tingly inside. However, it has been discovered that there is a critical error in the Hellcat infoverse
it um kinda makes more HP then stated
apparently 635hpat the wheels with a assumed 12% pwer train loss means the Hellcat actually makes about 725HP not 707
damn this sucks whatever shall we do
For Sweden
> mr_gofast
08/25/2014 at 13:05 |
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Maybe power train loss is less than 12%
FrederickLawOlmsteez
> mr_gofast
08/25/2014 at 13:07 |
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Calibration of the dyno could easily explain the difference.
Bullitt417
> For Sweden
08/25/2014 at 13:10 |
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That would be impressive. I usually use 15% drivetrain loss for rear wheel drive and 20% for AWD. Aside from electric cars, I have not really heard of losses below 12%
Sir_Stig: and toxic masculinity ruins the party again.
> mr_gofast
08/25/2014 at 13:11 |
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The dyno process has so many variables anything close to the posted numbers should be assumed as posted numbers +/- test error
jlmounce
> mr_gofast
08/25/2014 at 13:12 |
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We need to actually see the graph and when that 635 is made. They ran the car through all of it's gears, including it's overdrive gears. Based on how dyno's calculate torque, movement away from the 1:1 ratio effects the readout. Below 1:1 the dyno will read less power, above 1:1 the dyno will read more power. If that 635 was achieved in 7th or 8th gear, the numbers are probably inflated a bit.
It should also be noted that the hellcat was SAE certified at 707 hp. Dodge can market within 1% of the actual number. It's possible that 707 figure is on the low-end of whatever number the engine was certified at. It's also possible it's at the top end.
Food for thought.
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Sir_Stig: and toxic masculinity ruins the party again.
> Bullitt417
08/25/2014 at 13:13 |
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But you also have elevation, weather, dyno manufacturer, dyno calibration ect to factor in. 707 hp could be on the top of pikes peak for all we know.
anothermiatafanboy
> For Sweden
08/25/2014 at 13:14 |
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That already seems low.
Saracen
> mr_gofast
08/25/2014 at 13:33 |
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not all dynos are the same....some seem like they are always overly optimistic (like the dyno that Edmunds uses).
Jayhawk Jake
> mr_gofast
08/25/2014 at 13:35 |
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Am I the only one that dislikes seeing crank numbers published instead of wheel?
There's a bit of a gray area on the hellcat, the hellcat is the name of the motor so the hellcat produces power at the crank. But crank horsepower is kind of irrelevant when you're buying a car because you don't actually get that power at the wheels. I'd rather know what the car is putting down.
On a semi-related note a Ford salesperson once tried to convince me that Chevy published wheel horsepower instead of crank horsepower like Ford, so the Camaro actually makes less power than the Mustang because wheel horsepower is always higher. When he didn't believe my correction I just said 'physics doesn't work that way'.
the__man
> mr_gofast
08/25/2014 at 18:59 |
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The way SAE measures horsepower is a little different than strapping it to a dyno and saying thats it. It gets more involved for a SAE power rating