5ktq Clutch upgrades? and car update...

[Jim Green]

--- George Selby <gselby4x4 at earthlink.net> wrote:

> At 12:33 AM 8/26/04, you wrote:
> >Thats simmilar to what I said, even started with
> the same letter, but you 
> >have 1 letter too many! The standard for an AWD car
> is 20% drivetrain 
> >loss...thats would put my peak number at roughy
> 475hp at the flywheel, and 
> >the average @ 422hp.
> 
> 
> I think that the drivetrain losses aren't a
> percentage for a given car, 
> it's just specified that way for extremely general
> comparisons between 
> cars.  By this I mean if your drivetrain sucks up 30
> HP to move down the 
> highway at 100 miles per hour (all purely made up
> numbers!) and you 
> increase the available engine power by 100HP, the
> drivetrain doesn't 
> suddenly need an additional 20 HP to go the same 100
> miles per hour (if you 
> change your tires, or change the gearing, on the
> other hand, it may require 
> more or less power to go the same speed.)  So if
> your stock engine produces 
> 200 HP, and you chassis dyno it at 160HP, and then
> you do some mods, and 
> your new chassis dyno power is 350 HP, then your
> engine is only producing 
> 390HP (200HP + the difference between dyno reading 1
> and dyno reading 2) 
> not 437.5 HP (350/0.8=437.5).


Hmm, I don't think that's quite right.  So you're
saying if you put a 40 hp motor in your car that had
the 200 hp motor it wouldn't even move?  Also, as
power increases, so does the heat in the tranny and
diffs which is all lost power.  There's not one
magical drivetrain loss# plus there always seems to be
correction factors involved somewhere on the dyno's. 
This is why I like drag strip #'s, they don't lie.


		
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