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RED850

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Sydney Australia

5th Sep, 2006 at 03:06:27am

Ok Guys and Gals,

Over here in Australia we talk Horse Power figures at the wheels, 99% of the time, this is due to the most part that we have vehicle chassis dyno's more available to the general public than engine dyno's.

but what seems to be a funny thing is that most of Europe especially UK talk flywheel HP even though Chassis Dyno's are far more availabel than engine dyno's too.

So my two questions are:

why is this ??

second can some people please tell me there HP figures at the wheels ad how you calculate thi into HP at the flywheel?

look forward to your comments

Grant

179hp on 12psi 1293cc of pure A series
14.0et @101 mph


Dangerous

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Swindon

5th Sep, 2006 at 05:10:31am

On 05/09/2006 03:06:27 RED850 said:
second can some people please tell me there HP figures at the wheels ad how you calculate thi into HP at the flywheel?
Grant

The car is power tested on it's wheels,then run back down on the dyno in neutral-this works out the transmission losses


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Ben H

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Melton Mowbray, Pie Country

5th Sep, 2006 at 07:57:26am

We only really talk bananas on here because we all know that RR figures need to be taken with a pinch of salt.

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andeh

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Near Daventry, midlands

5th Sep, 2006 at 08:22:01am

some with more salt that others it has to be said

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Bat

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Bermingum

6th Sep, 2006 at 01:02:42pm

Hi,
I think it's because the flywheel HP is a bigger number and so sounds better. It is what you've got at the wheels that counts!
Has for how to work it out I think there may be a formula or figure in the Vizard bible as a sort of rough guide. It is worked out on the rollers by the method mentioned above.
Cheers,
Gavin :)

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andeh

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Near Daventry, midlands

6th Sep, 2006 at 05:46:23pm

On 06/09/2006 13:30:44 mini1071s said:

We all know a certain person who claimed his 998 made 90 hp with a stock 940 head then you looked and he claimed 60+ hp at the fly for the stock 998 engine. Made me laugh anyway.



Made me laugh too *laughing*

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Miniwilliams

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9th Sep, 2006 at 07:00:06pm

Your better talking wheel hp as that's what gets you along as you know.

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