Had the 3.9 RRC dyno'd today

Not sure if this is a repost or not, but there's some interesting setup photos on this page

http://www.mez.co.uk/ms12.html

Quote:

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Originally Posted by GuyG

Would there be much difference in figures between a rear wheel dyno with centre diff in and a 4wd dyno

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with a Rear Wheel Dyno there is less power sapping thru your Transmission as Power transfers thru your Clutch , Gear Box , Rear Differential then to Rear Wheels

4WD Dyno the same power transfers thru Gear-Box , Transfer Case and both F/R differential ,then to the wheels hence there is more horse-power being sapped thru the transmission line.

so if your engine is 120kw at the Flywheel on a 2wd it might translate to 100kw at the rear wheels when Dynoed , but on a 4wd Dyno same engine power at the Flywheel might translate to 80 kw of power at the wheels.

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Edit : I just re-read your Question and I don't have any real figures
I know mine being 83kw at flywheel was dynoed at 49.8 kw at wheels

and this translated to app 40% power loss thru transmission.

Quote:

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Originally Posted by GuyG

So how do you convert hp to kw, then with the torque from ft/pd to what ever the current measure is?

Cheers

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100hp = 74.6kw.
100ft-lbs = 135.6Nm.

Quote:

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Originally Posted by Disco_owner

Edit : I just re-read your Question and I don't have any real figures
I know mine being 83kw at flywheel was dynoed at 49.8 kw at wheels

and this translated to app 40% power loss thru transmission.

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Must be RPM dependent too.
My turbo Isuzu powered one puts 74kw to the ground at 2000rpm. But if that lost 40% then it'd be producing 123kw.

It'd be great if it was.:cool:

ok so my car was done in third :) Sweet. It is interesting to see the differences in all these motors.

So are you guys getting your cars dyno'd at all 4 wheels, or rears only. Or is it not possible to do RWD. Just asking, because for some reason my car didn't want to be dyno'd on a 2WD dyno.

Mine was done with the rear wheels only, but I have a LT230 fitted, my understanding is that if you have the viscous coupling fitted then it should not be done on a rear wheel only machine.

The mechanic lifts the front diff and puts it on axle stands.

I unfortunatelly don't have a print out atm, will get one next time its tuned and see what he says about a 4 wheel dyno - just out of comparison interest to other here

well like Philips mine was done at greames on a 4 wheel dyno.
I hope to be doing another dyno run up this way (qld) after sorting out the thor injection.

Quote:

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Originally Posted by Boxer

So are you guys getting your cars dyno'd at all 4 wheels, or rears only. Or is it not possible to do RWD. Just asking, because for some reason my car didn't want to be dyno'd on a 2WD dyno.

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Four wheel.