[DMCForum] Re: Andrei's GTW/GVW Limit
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[DMCForum] Re: Andrei's GTW/GVW Limit



Part of your towing limit is going to be the frame itself.

But the crux of your problem is that initial 2,500 RPM (which still
yields only 130 ft lbs of torque). Too much weight on the rear and
you'll only reach it with great difficulty, if at all. In the adjacent
lane my truck with the same load will be steadily accelerating at half
the RPMs.

High rev'ing high horsepower engines DO have their place. My truck's
engine is very large and very heavy (but I hasten to point out: as an
inline it IS more efficient than a V shaped engine). It consumes more
fuel than a smaller engine. It must stay in a narrow low RPM range.

Bill Robertson
#5939

>--- In DMCForum@xxxxxxxxxxxxxxx, "Andrei Cular" <andreic@xxxx> wrote:
>
> > Andrei's Porsche, bless it's little German heart, has very little
> > power in the RPM range where loads are hauled. With 5,000 lbs coupled
> > to it, I don't know if he could even let the clutch out without
> > stalling. I absolutely guarantee he couldn't reach his power band
> > pulling such a load over a mountain.
> >
> > Andrei's Porsche has power, don't get me wrong, but only after he's
> > rev'ed it very high. Until then, he has very little power.
> >
>
> Bill you are probably right 5,000lb would probably be a bit much for
my car,
> the factory has it rated to tow only 3,500lb.  Except in Italy with
would
> only approve it for 2800lb
>
> As far as powerband you really need to see the charts out of the owners
> manual, but I don't have them in the car.  So take a look at
> http://www.speedforceracing.com/dyno/24.jpg  which is a supercharged
'86 944
> and you will notice that the torque jumps to about 130lb at only
2500rpm and
> reaches a max of about 170lb 2000rpm later at about 4500.  The curve
is a
> little different for my car but it still jumps very close to max
torque very
> quickly.
>
> Then you can take a look at what happens when they bolt on a turbo
and a few
> other external mods.  http://www.speedforceracing.com/dyno/timdyno.jpg
>
>
> Andrei



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