Miata Mailing List: February 1996, Message #169
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   From: Frank 
Subject: Re: Dyno HP conversions
   Date: Sat, 3 Feb 1996 16:28:33 -0500

At 13:38 02/02/96 -0500, Paul Turin wrote:

>		DIN (brake) HP = 1.28 x HP at wheels 
>
>	Thus, Brian Goodwin's Autorotor conversion, which measured 150 HP on the 
>dyno, is putting out 192 HP at the crankshaft. I'm jealous!
>
>	Now, you might think that this factor would vary a lot depending on make,
construction of the tranny & diff,  tire pressure & size, etc., but
>supposedly its very consistent between cars, regardless of these things.
>
>	OK, I got this from an engineering book and from a dyno guy I know, and 
>I'm interested in hearing opinions to the contrary.

Ok, Paul, you asked for it.

I have an Aerodyne stage 2 on a (otherwise stock <-- enginewise that is ;)
1.6 and I've also put it on the dyno (bench type). It has 150 hp at the rear
wheels.
I had an 18 hp loss in the transmission, resulting in 168 hp at the
crankshaft. These were the results at that particular time of testing, with
all the atmospherical particularities taken into account - DIN hp for my car
is 175. I have wider tires - 215's. 
I also have several other test results (performed on the same dyno) from
other miatae, all 1.6's. One of them was on 195's and had a 32 hp
transmission loss. Another one (with a Sebring and on the stock 185's) had a
loss of 25 hp in the transmission. The DIN hp for that car was 156 at the
crankshaft. Maximum torque was 129 ft/lb. Just for reference, mine has 168
ft/lb of torque. The curve for the Sebring is a lot flatter and closer to
stock than with the Aerodyne though.
FWIW.

 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Frank and Bibi 
Antwerp, Belgium

page de la maison : http://www.club.innet.be/~fbro/home

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