RE: dumb Dyno question

["Fry, Larry" <LEF@chem-tronics.com>]

Two responses to Jason:
One, a dyno operator can manipulate the balance between load and engine rpm
in a way that will produce "spikes" in the torque readings.  These are
momentary and not true indicators of engine output.

Two, I agree with Jason's statement on torque vs. hp.  Torque is what our
motors produce and what accelerates a Scirocco.  Hp is just a calculated
number derived from an engine's torque/rpm output.
Enjoy the ride.

Larry sandiego16V
old crock and his old 'Roc

-----Original Message-----
From: 16V Jason [mailto:jason@scirocco.org]
Sent: Tuesday, November 13, 2001 1:31 PM
To: Randy B; scirocco-l@scirocco.org
Subject: Re: dumb Dyno question


At 04:10 PM 11/13/2001, Randy B wrote:
>Ok so this is probably a real dumb question but.......
>
>When HP figures are thrown around in magazines for new cars and for
modified
>cars which figure are they using.
>Wheel HP, Crank HP, other?

New Car manufacturers and thus the new car magazines (C/D, R&T, Automobile, 
MT, etc) use crank horsepower.

A good rule of thumb is that if you don't see "...at the wheels" listed 
right next to it, it's motor horsepower.



>Got my TT 1847cc 8V dyno'd this weekend and according to the guys running
>the dyno it max'd around 105hp (a few people said they saw a spike of 110hp
>:^D ) at the wheels.

A spike of 110hp?  That doesn't really make any sense.  If you had a 
"spike" of 5hp, something's wrong with your engine.

Why do you say "according ot the guys running the dyno, it max'd around 
105hp".  First of all, where is your graph.  You should be able to see for 
yourself exactly what the max horsepower was... not "around" what 
horsepower it put down.  And perhaps more importantly, I wouldn't pay 
anyone to dyno my car and then walk away with nothing else but having been 
told an approximate HP peak.  The peak value is essentially meaningless -- 
it's the rest of the (torque) curve that's telling you what's going on.


>I am kind of curious how this compares to the 123hp (crank,wheels,other?)
>that the stock 1.8L 16V has.

Stock 1.8 16V = SAE 123hp.  That's 123hp peak at the engine.
Low-mileage, perfectly tuned 1.8 16Vs with no modifications will put 105hp 
peak to the ground.

Jason





>Thanks,
>Randy
>
>
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