To get to the ground HP, use a chassis dyno or a data recorder on a back
road or on the track.
Speed vs time and knowing the mass of the car+driver will allow one to
calculate HP.
Pick a MPH range you are interested in and run it there.
with a CVT, one cannot assume one fixed loss thu the entire MPH range. It
varies.
A gear pass is more predicable, car to car, but they still vary-along with
the final drive efficiency.
Chuck
From: "Andrew M. Brenkus" <[EMAIL PROTECTED]>
Reply-To: [email protected]
To: <[email protected]>
Subject: RE: [F500] MC HP Creep
Date: Sun, 15 Apr 2007 23:16:34 -0400
With my last motor rebuild I had the motor on a dyno and it showed 101HP
@ 8000RPM. This is not the HP at the wheel, I don't have that info on my
car. How would I figure out how much HP I am getting at the wheels?
Andrew
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf
Of Art
Sent: Thursday, April 12, 2007 9:26 PM
To: [email protected]
Subject: RE: [F500] MC HP Creep
Chuck,
I have been told by a good friend who is no longer in this sport that he
dyno'd his 494 Rotax in the 92 to 95 HP range at the rear wheels. Of
course, that may vary somewhat depending on one's tune. I don't think
anyone is at 100 HP, but I could be wrong :-).
Perhaps others might want to share their results with this list :-).
Art
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
Chuck Voboril
Sent: Thursday, April 12, 2007 10:30 AM
To: [email protected]
Subject: RE: [F500] MC HP Creep
I'd agree that 120HP is a good figure for now on a gas rord race GSXR600
motor for comparison since the motors are already very well developed
from the factory.
Does anyone have any argument that 100 HP is a good HP to use for
comparison on the well sorted and piped Rotaxes currently?
These are all crank HP-not HP at the tranny output shaft or at the
ground.
It ought to be interesting to watch the passes on the straights :->
Chuck
>From: "Jay Novak" <[EMAIL PROTECTED]>
>Reply-To: [email protected]
>To: <[email protected]>
>Subject: RE: [F500] MC HP Creep
>Date: Thu, 12 Apr 2007 10:15:54 -0400
>
>I think you are wrong about the possible HP gains Jim. The 600 race
>engine builders of MUCH MODIFIED ALKY engines are getting about 125 hp.
>In any case we are talking stock engines here & they will probably get
>3 to 5 hp from pipes. If they make too much power we will have to
>restrict
them.
>
>I already have 4 or 5 good drivers who want to drive the car this year
>& I hope they will make plenty of public comments about the engine.
>
>Thanks ... Jay Novak
>
>
>-----Original Message-----
>From: [EMAIL PROTECTED]
>[mailto:[EMAIL PROTECTED] Behalf Of
>[EMAIL PROTECTED]
>Sent: Thursday, April 12, 2007 9:23 AM
>To: [email protected]
>Subject: [F500] MC HP Creep
>
>
>Please remember that whatever initial MC HP you use, whether published
>or found on the dyno, will go up about 25 HP after the racers have
>sorted the motor out over a 2 year period. This has been proven over
>and over again since the beginning of car racing. For the sake of
>keeping both the 2 stroke/CVT and MC choices roughly equal, this
>additional HP has to be kept in the calculation.
>
>Jim
>
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