Discussion
www.pumaracing.co.uk/power3.htm
www.sdsefi.com/techdyno.htm
www.sportcompactcarweb.com/editors/technobabble/9907scc_technobabble/
http://yarchive.net/car/dyno_accuracy
"........RWD cars - add 10 bhp to the wheel figure and divide the result by 0.88...."
www.sdsefi.com/techdyno.htm
www.sportcompactcarweb.com/editors/technobabble/9907scc_technobabble/
http://yarchive.net/car/dyno_accuracy
"........RWD cars - add 10 bhp to the wheel figure and divide the result by 0.88...."
There is no definative answer
Different tyres, differing tyre pressures, weight of vehicle on rollers, temperatures, types of actual rollers themselves, gear used, diff ratio, gear oil etc can all effect drivetrain losses..
Why bother guesstimating when the figure you are measuring is wheel hp/torque in the first place ?
Just use it. It removes the guessing element.
Different tyres, differing tyre pressures, weight of vehicle on rollers, temperatures, types of actual rollers themselves, gear used, diff ratio, gear oil etc can all effect drivetrain losses..
Why bother guesstimating when the figure you are measuring is wheel hp/torque in the first place ?
Just use it. It removes the guessing element.
Yes and No.......
The figure you get from the dyno will be acurate (give or take a bit) but will it be a correct guage of your cars power, most probably not..........
The VERY big problem with dyno's and Monaro's is Air intake temp (as recorded by the cars PCM not some probe)
The dyno needs to maintain a constant Intake temp or the car will remove timing and on the Monaro this is very agresive.
If you are 1deg over the cars programed settings it removes 3deg of timing which is about 12hp and this just gets worse as the temps go up
The figure you get from the dyno will be acurate (give or take a bit) but will it be a correct guage of your cars power, most probably not..........
The VERY big problem with dyno's and Monaro's is Air intake temp (as recorded by the cars PCM not some probe)
The dyno needs to maintain a constant Intake temp or the car will remove timing and on the Monaro this is very agresive.
If you are 1deg over the cars programed settings it removes 3deg of timing which is about 12hp and this just gets worse as the temps go up
That's very interesting Paul, our car was very hot when it dynoed 420, do you think it could have made more if it was done without them running it up and down and then doing an aborted run where the rollers exceeded the max speed? The bonnet was also down which would have probably exacerbated the problem...
I agree with stevie turbo, rear wheel or hub figures are the only way to go for comparisons with other cars on different days, different weather etc.
Link below might be of interest
www.dynamometer.fsnet.co.uk/power-losses-flywheel-BHP.htm
Link below might be of interest
www.dynamometer.fsnet.co.uk/power-losses-flywheel-BHP.htm
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