How do kw and rwkw and fwkw work on a dyno

[ILLUMINOUS]

OK well i recently had my car dyno's and it pulled 112.9kw, stock i think it came out with something like 124kw...is my reading from the dyno in rwkw or fwkw. and is there a way to check engine kw

[old mate]

the only proper way to test power at the crank is on an engine dyno, not a chassis dyno.

your car was on a chassis dyno, so the power was recorded 'at the wheels'

ps. is it manual?

[calais24/7]

Think he was asking if the figures relesed by GMH (or whoever) mean 124kw at the wheels or fly wheel

[ILLUMINOUS]

ok then cheers

ps. is it manual?

yer it is manual
U should get a bit more from urs because i only got the old buick and urs would be an ecotech

[ILLUMINOUS]

[QUOTE]Think he was asking if the figures relesed by GMH (or whoever) mean 124kw at the wheels or fly wheel [QUOTE]
yee that to

[Darren_L]

manufacturers always quote engine power/torque, dynos will only give you power at the wheels
it's virtually impossible to calculate engine hp from a chassis dyno, but a rough method is rear wheel hp is equivalent to engine kw
ie 180rwhp = 180kw at the engine. It's only a very rough estimate though

[TMM]

The 124KW reading is recorded by having the engine attached directly to an engine dyno (no trans/diff/anything) to get the 'at the flywheel' reading.

I've only ever seen 'fwkw' to refer to 'front wheel kilowatt' for a front wheel drive car...

Some power is lost through the drivetrains and wheels. The power is lost by friction in the transmission, differential and tyres, and given off as heat. Generally automatics lose more power then manuals due to the torque converter being inefficient, and having big heavy wheels loses power because the trans/diff have to work harder to turn them.

Assuming your engine makes a healthy 124kw at the flywheel, 112.9rwkw would mean you have 9% of power lost between your engine and the wheels. This is a pretty good result, even for a manual. I'd say your dyno reading is a bit happy/optimistic or your engine is making more then 124kw.

[ILLUMINOUS]

I'd say your dyno reading is a bit happy/optimistic or your engine is making more then 124kw.

The dyno should be pretty accurate because i got i done at one of the best places in adelaide from what ive heard....wasnt there a thing with the buick engines that some made quite an amount more power then alot of the rest and had better fuel economy and lasted longer or is that just rumors

[Not_An_Abba_Fan]

Aliens are real too.

[Darren_L]

also keep in mind manufacturers don't engine dyno test each individual engine. They get the figures from the original test engine and that's the figure they quote for any car fitted with that engine.

But in reality, individual engine output from factory can vary significantly between one car and another of the very same model, due to the innacuracies of mass manufacture.

[Clutchy]

Were did you get it done at ? unless you have had the car since new it will be hard to say it is dead stock how many kays it got on the clock ??

[ILLUMINOUS]

Were did you get it done at ? unless you have had the car since new it will be hard to say it is dead stock how many kays it got on the clock ??

I got it done at hi-tech dyno performance and the guy i bought it off owned it his hole life and he said hes never had anything done to it perfomance wise and the only mod ive done is 2 and 1/4 inch extractors and its done 300,456kms...it actually broke 300,000 on the dyno

[VS 666]

I got it done at hi-tech dyno performance and the guy i bought it off owned it his hole life and he said hes never had anything done to it perfomance wise and the only mod ive done is 2 and 1/4 inch extractors and its done 300,456kms...it actually broke 300,000 on the dyno

*remembers his vs on the dyno... 240,000... water pump locked up mid flight, sprayed boiling fluid everywhere, extractors were glowing a deep purple... a fun time had by all* how on earth did ur car stand up to it at 300 thou

[Troy711]

also keep in mind manufacturers don't engine dyno test each individual engine. They get the figures from the original test engine and that's the figure they quote for any car fitted with that engine.

But in reality, individual engine output from factory can vary significantly between one car and another of the very same model, due to the innacuracies of mass manufacture.

True that. I know a dude who had an EF or EL XR6 ute which was a freak. It pulled harder than almost every other Ford 6 on the road at time even though it was stock.

[ILLUMINOUS]

remembers his vs on the dyno... 240,000... water pump locked up mid flight, sprayed boiling fluid everywhere, extractors were glowing a deep purple... a fun time had by all* how on earth did ur car stand up to it at 300 thou

ahaha maybz because god loves my car or something gay like that....who knows how my engine handles what i give, ive had it valve bouncing that many times i kno exactly how many revs it takes before the valved start dancing...its 5,600 rpm by the way

[soop]

Probably doesnt valve bounce.
Likely the limiter.

[ILLUMINOUS]

ahh well its somethin tht means th revs wont go any higher hahaha thats all i kno and it sounds siik as