What's The Transmission Loss For A Tubby?

[MattMR2Turbo]

Hiya,

I'm taking my tubby on a group rolling road tomorrow. Apparently his system is new, and hasn't got a print out at the moment, and someone also told me that he can only give out an 'at the wheels' figure.

It's a bit crap but I'm going with a load of mates.

So anyway, I think the bloke will be calculating the flywheel figures for everyone on the day, but he's a Cossie tuner (Harvey Gibbs) so might not know the transmission loss for my car.

What has everyone else's turned out to be on the rollers?

Cheers

Matt

[Hedgehog Dodger]

Its anything between 15 - 20 %. Not that much really. Considering the Scoobies have 40% due to 4WD.

A Tubby pushing 250HP at the fly will probably be putting about 200HP at the wheels :-)

Obviously it all depends on how healthy your car is.

:D

[Bibbs]

My car on flat(ish) tyres ran 250 fly, 196 @ wheels ..

It was a cold engine, warm garage and my tyres were flat, wet and cold ..

So that's about 20% loss ..

[System~G]

There are some comparisons from a couple of r/r's done last year.

Links:

IMOC Top Gear Performance Results

IMOC Powerstation Dyno Shootout Results

There should be enough info to give you a rough idea

[pizza boy]

Mine was 18%. I got 255bhp@the wheels and 245lb/ft @wheels. My dyno figures rnt proper as my car got mapped with a cracked de-cat pipe. Due in for remap next fri im expecting better torque output not bothered bout bhp.