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Discussion Starter #1
Here are the pictures of my dyno run, 1996 900 SE. Drive train losses are about 13%.

Horsepower + Air/Fuel ratio


Torque


 

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Good stuff Eric!

Nice torque curve- or should I say ruler above 3k!


Really useful too to see the A/F ratio, and the correlation between it starting to lean out and the drop off in power rise.
 

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Discussion Starter #3
The Air/Fuel ratio is actually getting richer as the rpms increase. It starts off at 15:1 air/fuel and fuel increases so that the mixture is 11:1 by redline. The power drop off is due to the small T25 being unable to supple the same amount of boost as rpms increase. The torque peak coincides with max boost which is 22 psi. After that boost decreases down to about 15 psi by redline.
 

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Discussion Starter #5
It cost me a little extra but they had a wide band O2 sensor that they stuck into the exhaust pipe that measured the air/fuel ratio. The stock O2 sensor is not accurate over a wide range.
 

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Doh! Was I a nonce or what!!! Don't know where I had my brain there, or what planet I was on.

Back to observation school for me...
 

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Originally posted by Bubbles (fka Mark E):
[qb]Doh!        Was I a nonce or what!!! ( [/qb][/b]
Just for clarification, this is the "Idiot, numbskull, halfwit" definition of nonce, not the other one!!
 
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