Originally Posted by dingy
Mike you make me piss at times....
You claim the engine dyno is most accurate yet it has so over inflated figures known to man...
You could run at ava - bigger rollers, less loss so more at the wheel figures...
You could run at a DD for a third gear run, so less top speed, less losses so more at the wheel figures.
Meaning the faster you go the more the loss's
Mine @ scs dyno made 405 say, made 320 @ wheels @ ava and 365 @ fly at nobles.....
The cooling at nobles is fine...
Nutters made 4bhp difference at APT to nobles @ flywheel.....so its pretty consistant with both those two rollers.
The algorithm's for working out at the wheels, the gear speeds and the roller size are all different on the 3 rollers mentioned so its impossible to say which is actually correct.
RR are no where near as accurate as it being on the road IMHO, stick your arm out the window @ 150mph and see how fast the air is moving, no fan at any rr feels like that and thats just one factor...
I use nobles cause is a measure on how the car is changin, same rollers.
I am going to use a dyno Dynamics rollers on sat with the same boost so lets see how much the rollers differ.
You complete donkey, so you're telling me YOU believe the 125bhp transmission loss?
If you read the rest of my post, you will see that I agree that the at wheel figures can be pretty much trusted
.
The dyno figure is a GROSS figure without ANY ancilliaries, so it WILL differ dramatically from any in-car figure - ESPECIALLY if you go and strangle the car with a restrictive exhaust
.
This was why I started dynoing my own engines with both the airbox and exhaust on the engine that it would be using in the car - in order to minimise the differences between in-car and out of car
.