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Dyno day back in March

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lee_iceman
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Dyno day back in March

Postby lee_iceman » Sun Nov 25, 2007 1:24 pm

OK guys, following on from a dyno run at TDi yesterday.
The only thing I have changed on my car is the air filter.

At Westwood Engineering back in March I had a power output of 153.5bhp @ 6470rpm at the wheels and 247.3Nm @ 5365rpm, this was worked out to 213.3 and the fly, which they worked out as a power loss of 39% through the transmission?

After yesterday's dyno run at TDi, the power at the wheels was 188.8bhp @ 6340rpm and 228.7Nm @ 4610.
So going by the 39% transmission loss calculated by Westwood, the engine should be pushing out 262.4bhp?

It is more likely though that the transmission loss is around 21%, which will actaully make the power at the fly 228.4.
So using 21% as a base the calculated power at the fly in March was only 185.7 :(

Just goes to show nobody can actually be sure what power then engine is pushing out at the fly :)

I know a lot of factors affect the outcome which is why I am very happy with the result from TDi, as the room the dyno is done in is a totally controlled environment, which was demonstrated by 3 power runs with the graphs exactly on top of each other :)
The outside temperature was just as cold as it was in March :lol:

Just wondering if anyone else had any different dyno runs after the meet in March.
Image
My Garage, My YouTube
Nurburgring2 2006, lap in 11:48 | Bruntingsthorpe 2006, 1/4 mile in 15.8@88mph
213.3bhp and 247.3Nm of torque

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Mr. Tezza
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Postby Mr. Tezza » Sun Nov 25, 2007 1:55 pm

Aren't you always gonna get differences in results if you dyno your car from 2 different places, theres so many variable involved thats why i wud always go back to Westward but in saying that i know it'd be pretty mad for ya to come over here just to dyno your car every time!
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lee_iceman
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Postby lee_iceman » Sun Nov 25, 2007 1:59 pm

Very true :)

Just wondering how Westwood got the transmission loss to 39% though :?
Image

My Garage, My YouTube

Nurburgring2 2006, lap in 11:48 | Bruntingsthorpe 2006, 1/4 mile in 15.8@88mph

213.3bhp and 247.3Nm of torque

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elexes
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Postby elexes » Sun Nov 25, 2007 2:01 pm

you also had crap petrol
if ive helped you in anyway vote for carlow to be the first tezzaworld drinking session

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feeler
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Postby feeler » Sun Nov 25, 2007 3:20 pm

surely a 39% transmission loss, would be way over the top for a 2 wheel drive car. if i remember right a 4wd car wouldnt even be calculated 39%.

is it not something like 17 to 20% for 2wd and 25 to 30 for 4wd?

at the end of the day rollin roads are only good for power at the wheel.


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