Questions about Dyno Result
06-29-2012, 03:50 PM
#1
Rennlist Member
Thread Starter
Questions about Dyno Result
Took my car in for a dyno run, have a few questions about the result.
Anyone know what the jog at around 5800 rpm could be caused by, maybe wheels slipping on the rollers ???
Also the power curve seems to go flat at the same rpm range, I would think it should have kept rising, maybe resonance flap not opening.
It did pull 232.8 HP and 215 ft/lbs at the rear wheels, but still, it looks to me like there is room for improvement.
Any help would be greatly appreciated.
Anyone know what the jog at around 5800 rpm could be caused by, maybe wheels slipping on the rollers ???
Also the power curve seems to go flat at the same rpm range, I would think it should have kept rising, maybe resonance flap not opening.
It did pull 232.8 HP and 215 ft/lbs at the rear wheels, but still, it looks to me like there is room for improvement.
Any help would be greatly appreciated.
06-29-2012, 10:52 PM
#3
Rennlist Member
Looks virtually identical to the results I had for a couple of pulls on a dyno at Rocket Rally Racing in Squamish (shop of Canadian rally champ Patrick Richard). My car is very similar to yours and his is also a Dyno Dynamics unit.
The main thing that affects dyno numbers is the "correction factor" used in the software. This is a multiplier, usually used to estimate crank horsepower from power measured at the wheels. In the runs shown here the correction factor was 1.0 (no correction) so assuming a 15% loss thru the transmission the engine output would be in the neighbourhood of 267.
As suggested I think the graph bump is just an RPM glitch.
Cheers!
Jim
The main thing that affects dyno numbers is the "correction factor" used in the software. This is a multiplier, usually used to estimate crank horsepower from power measured at the wheels. In the runs shown here the correction factor was 1.0 (no correction) so assuming a 15% loss thru the transmission the engine output would be in the neighbourhood of 267.
As suggested I think the graph bump is just an RPM glitch.
Cheers!
Jim
06-30-2012, 01:52 PM
#6
Rennlist Member
Thread Starter
Thanks for the input.
Jim you are right, those 2 dyno sheets are just about identical.
When I asked the operator about the jog in the curve, he said he didn't know what it was, but thought it was an electrical glitch, said he had it hooked up to a fuel injector.
Jim you are right, those 2 dyno sheets are just about identical.
When I asked the operator about the jog in the curve, he said he didn't know what it was, but thought it was an electrical glitch, said he had it hooked up to a fuel injector.