found this internet site interesting.  http://www.rri.se/index.php?DN=29

656 different vehicles, 1 dyno (hub dyno so accurate),

and comparison graphs of manufacturer stated output Vs actual output.  Quite alot of surprising on the outputs and confirming what people thought about the likes of the focus RS etc

all the below are with reference to the manufacturer claims

Golf edition 30 8 Hp under

Golf GTI 5Hp under

mk6 golf GTI TSI 5hp up

Golf R32 23Hp under

Leon cupra 11hp under

Octavia vRS 2Hp under

Scirroco R  2Hp up

scirroco TSI 8Hp under

Audi S3 2Hp under

Audi TT 3.2 S tronic 30Hp under

so the TFSi engines seem to be pretty much on the money.  the V6 not so much.

the diesels

Golf 2.0TDI CR170 6Hp down

golf 2.0TDI PD170 3Hp up

fabia vRS, 1Hp up

now for the other hot hatches

Focus RS is 20hp under

Civic type R is 16hp

Meganne RS250 18hp

Focus ST is 9hp under

08 impreza STI 30Hp under

Astra VXR  11Hp under

Vectra VXR 38Hp under

Mazda 3 MPS is bang on the money,

Mazda 6 MPS is 7Hp above

Nissan 350Z is 34Hp under

always amuses me when people think their cars are running at alot more than the manufacturer claims. evidently it seems much more likely to be running less

can you tell im bored :grin:

found this as well-

Top gear test track times

http://www.bbc.co.uk/topgear/show/powerlaps.shtml

Edited 16 August, 201015 yr by vRSy

A hub dyno will be more consistant than a tyre one sure, but it still won't be entirely consistant unless all tested cars have the same overall gear ratio from crank down to driveshafts.

Also, with that number of tests, the atmosphere in the dyno cell (temp, pressure and relative humidity) will have had an effect, and differences in the installation (such as SMIC vs FMIC vs top-mounted inter-heater on a turbo engine) will have effects.

not much of a shock, they could do with doing a test for MPG as well

FWIW if they are doing the tests back to back, then at some point the amount of oxygen available to the car will be lower.

There are a lot of factors, so I'm sure none of the RR's are actually that accurate.

FWIW if they are doing the tests back to back, then at some point the amount of oxygen available to the car will be lower.

There are a lot of factors, so I'm sure none of the RR's are actually that accurate.

dont forget the dynos measure the ambient pressure, temperature, air content etc and these are taken into consideration in the calculations.

A hub dyno will be more consistant than a tyre one sure, but it still won't be entirely consistant unless all tested cars have the same overall gear ratio from crank down to driveshafts.

Absolutely - there's still the fiddle factor to get back to the fly-wheel figure. Interestingly, in the list, it's mostly the 4wd cars which are significantly down on quoted figures!

Chris