RE: dumb Dyno question

[16V Jason <jason@scirocco.org>]

At 05:55 PM 11/13/2001, Fry, Larry wrote:
>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.

Yeah..... but..... duh!  Of course, you can get a Scirocco to show a spike 
of 200hp by dumping the clutch into 2nd gear at 7200rpm on the dyno. 
:)  But what good does that do?!

I dunno -- I'm in a critical mood today (does that surprise anyone?  Didn't 
think so) but what gets me more than anything is dumbfuck dyno operators 
who wouldn't understand what a torque curve meant if I shoved it up their ass.

I mean really... look at Bill Scarince's run that he posted to the list 
today.  Yeah, in this case we're lucky that we can see peak HP and Torque 
values -- but without sitting there for 4 hours labelling the damn graph 
and re-charting it, it's completely fucking useless!

If the moron running the dyno knew anything about what people were looking 
for, he certainly wouldn't have plotted the X-Axis as time.  What's the 
point of doing that?!?!  And why would he have started the dyno run at 
4,500rpm?

It wasn't just Bill's -- he fucked up everyone's dyno runs!  Thank God 
Bill's torque peak was high enough (i.e. over 4500rpm) that we can even see 
what the peak was!!!  The doofus on the dyno was more concerned with 
running people's cars through the gears like he was a real big boy and got 
to dwive dee big carws like dee big boys do.

Whatever. :)
Jason




>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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