Horsepower Stampede ... (where do they Go ?)

Dweezle · Postby **Dweezle** » Sun Jan 19, 2014 4:00 pm

My old Clio 172 has a factory claimed 125kw.
Ran 100.6fwkw which by my shabby calculations is 20%?

Does FWD have a much lower drivetrain loss than RWD?

MattR · Postby **MattR** » Sun Jan 19, 2014 6:21 pm

A couple of dyno operators I have used to tune the race engine in the Zed basically asked me "what horsepower would you like today?" so they should only be used as a tuning tool as others have said, and then basically for back to back testing in the same conditions and the same dyno and operator to get meaningful results.

Magpie · Postby **Magpie** » Sun Jan 19, 2014 7:14 pm

Or you just organise a dyno shootout day.

sailaholic · Postby **sailaholic** » Sun Jan 19, 2014 8:01 pm

Dweezle, yes fwd has fewer losses, one of the reasons most cars are arranged that way. Having said that, it's still down to dyno corrections.

As matt said, tuning tool and back to back comparison only really

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zossy1 · Postby **zossy1** » Sun Jan 19, 2014 8:53 pm

Yesterday was hot as hell... That certainly would have impacted the number.

oztrackdays wrote:Watched a 2002 NB8B on the Dyno today stock as a rock it was.

sounded good and revved cleanly made 67 rwkw

If we take RedBook as gospel.

Power 107kW @ 7000rpm
Torque 168Nm @ 5000rpm
Acceleration 0-100Km/h (secs) 8.4
Cam DOHC with VVT

So If my maths is correct this car is making < 63% of the claimed power, so a 37% drive-train loss ...

Is it more likely to be a softer engine, Mazda using creative accounting in the brochure from day one or a little of each ?

From this Thread another car has 75 rwkw with some basic mods so it seems believable.
http://mx5cartalk.com/forum/viewtopic.php?f=29&t=60983

Can anyone else provide stock as a rock dyno charts for MX5's