Rolling Road Results - Need advice! :-(

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08-11-14, 10:51 PM

#31

Stuno1

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Agree with all the above. This tuner gets a lot of stick for their rollers. I just wanted them to clarify what power they were providing, they now have. Also, they couldn't get to grips with the f either. Not expecting a spot on reading but 4 of us will be going to the next place which is a lot better and the. We can get a good idea.

Stu

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08-12-14, 06:07 AM

#32

lobuxracer

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Quote:

Originally Posted by lowrideraz

It most certainly is!!! The clue here is WHP (Wheel Horsepower). The amount of power being put down on the pavement. With lighter rotational mass (wheels, tires, brakes and etc) you will be putting more of the engines power to the pavement because it's not being absorbed by the heavier wheels. Though the actual power of the engine is the same, more of that power is getting to the pavement, or the pavement HP measuring device, the Dynamometer. That would also be the case if we, say, lightened the driveshaft, less power train loss, again means more power to the wheels.

Lou

The engine's horsepower is unchanged. Dynos are supposed to measure power. I can do the same thing with just air pressure. Do you really think the tire pressure stays the same during multiple dyno runs? I know for a fact it does not. I've seen run to run variances of 5% just because something changed beyond the operator's control. If it is an accurate tool (not precise, but accurate) the results would be repeatable. I haven't seen that from any shop chassis dyno.