The complete automotive resource for buyers, sellers, and owners like you.
Car, Truck and SUV Forums at Roadfly
+ Bentley Forums
+ BMW Forums
+ Cadillac Forums
+ Chevrolet Forums
+ Ferrari Forums
+ Jaguar Forums
+ Lamborghini Forums
+ Lotus Forums
+ Mercedes-Benz Forums
+ Maserati Forums
+ MINI Forums
+ Porsche Forums
+ General Discussion
+ Marketplace Forums
Re: Dyno Results from AMS (archive)
[ Follow Ups ] [ Z3 Coupe Message Board ] [ Msg. Board FAQ ]
Posted by Karl Asseily on July 23, 2000 at 02:28:27:

In Reply to: Re: Dyno Results from AMS posted by Shawn Fogg on July 22, 2000 at 21:55:26:

Interesting..... I completely see your point.
So what this means is that the chip does indeed do what it is supposed to do.
If you take my best HP figure (213.4), you then get 258.2 HP at the flywheel at 6000 RPM.
Which is about what a chip, combined with air intake and exhaust, would provide.

Pretty damn cool. I am happy.
thanks Shawn for the insight.


Karl,

"18% of 206.5 is:
(206.5 * 18) / 100 = 37.17"

You are figuring an 18% GAIN on your rear wheel HP to try to calculate your flywheel HP. This isn't correct... the 18% is a LOSS from the flywheel numbers. 18% loss of flywheel HP is a larger number then 18% of rear wheel HP. As such to convert rear wheel to flywheel you multiply by 1.21 which corrects for a 18% (actually 17.6ish%) flywheel loss.

For example your engine is 240hp flywheel. A 17.6% loss (rear wheel) is 42.240 hp. So your rear wheel HP would be 240-42.240= 197.760 hp.

Now if you try to recalculate the flywheel HP by multiplying by 1.176 197.760 * 1.176= 232.565 hp. You just lost about 8hp.

But if you use 1.21 you don't. 197.760 * 1.21 = 239.28.

Got it?

Shawn




Follow Ups:


[ Follow Ups ] [ Z3 Coupe Message Board ] [ Msg. Board FAQ ]
Questions, comments, or problems, please visit the Roadfly help desk.
Roadfly.com Logo © 1997 - 2008 Jump Internet Inc. All rights reserved.