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Old 02-06-2010, 08:47   #1
xpro
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Dyno Cheating guide

Just found this browsing one of the forums, very intested thread, and it explains simple things how dyno readings can be changed to suit or just by a simple mistake made by an operator.

CLICK HERE
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Old 02-06-2010, 09:05   #2
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I had a guy mention to me the other day that he had recently taken his car to a rolling road and when he mentioned to the operator that the car was for sale he was then asked 'Oh... do you want a graph that will help sell the car then'

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Old 02-06-2010, 09:30   #3
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So do these corrections take place when the dyno guesstimates at-the-wheel HP to at-the-flywheel? What I'm asking is, if everyone quoted flywheel HP rather than wheel, would we get rid of all this. . .
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Old 02-06-2010, 10:22   #4
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Quote:
Originally Posted by seefarr View Post
So do these corrections take place when the dyno guesstimates at-the-wheel HP to at-the-flywheel? What I'm asking is, if everyone quoted flywheel HP rather than wheel, would we get rid of all this. . .
No its the otherway round. Flywheel HP is guestimated, wheel HP is measured.
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Old 02-06-2010, 10:29   #5
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what would 363WHP be in flywheel power?
cheers
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Old 02-06-2010, 10:53   #6
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Using the MLR 24% losses figure, that works out to be 477.63 bhp

Just divide by .76

HTH

Andy
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Old 03-06-2010, 11:32   #7
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No its the otherway round. Flywheel HP is guestimated, wheel HP is measured.
Doh! Got it the wrong way round
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Old 03-06-2010, 11:39   #8
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Quote:
Originally Posted by AndyF_RSX View Post
I had a guy mention to me the other day that he had recently taken his car to a rolling road and when he mentioned to the operator that the car was for sale he was then asked 'Oh... do you want a graph that will help sell the car then'

Andy

Thats just wrong!!
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Old 03-06-2010, 12:04   #9
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Great read, a few things to look out for
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Old 03-06-2010, 12:18   #10
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Quote:
Originally Posted by seefarr View Post
So do these corrections take place when the dyno guesstimates at-the-wheel HP to at-the-flywheel? What I'm asking is, if everyone quoted flywheel HP rather than wheel, would we get rid of all this. . .
Quote:
Originally Posted by Conrad View Post
No its the otherway round. Flywheel HP is guestimated, wheel HP is measured.
Quote:
Originally Posted by xpro View Post
what would 363WHP be in flywheel power?
cheers
Quote:
Originally Posted by craneboy View Post
Using the MLR 24% losses figure, that works out to be 477.63 bhp

Just divide by .76

HTH

Andy
From what I understand it's relatively simple to fudge the wheel power measurement too, independent of the dyno, factors like tyre pressure can alter the figures and that's before you take into account that different types of dynos measure wheel horse power slightly differently, so will give different WHP figures for the same car!

In short, don't rely on dyno figures to compare cars or even adjustments to the same car if done on different days.

Last edited by youngsyr; 03-06-2010 at 12:50..
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Old 03-06-2010, 12:37   #11
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Quote:
Originally Posted by craneboy View Post
Using the MLR 24% losses figure, that works out to be 477.63 bhp

Just divide by .76

HTH

Andy
And the moon is of course also made entirely from Cheese, lol!
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Old 03-06-2010, 12:43   #12
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I suspect that even using the correct data for IT, AT etc in a properly controlled environment that it would be relatively easy to change the ATW figure by 50HP. 4WD cars are the easiest of all to fudge, just get the bed length a fraction out for the cars wheel base and leave the straps a little on the loose side and watch the figures
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Old 03-06-2010, 17:34   #13
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ive been constantly surprised how many figures get bounced around HP wise

its quite easy to FUDGE a power run on any rolling road ,if the operator understands there rollers well ,as most do
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