We did increase the back springs for speedweek to 800's from 400's..... the
nose seemed to be okay at Maxton... but with the next 50mph we had evidence
of compression on the nose that was uncomfortable...
So its the fronts that we are changing to 600's... Raising the nose further
does increase the airflow under the car and I suspect that a diffuser under
the car would be interesting...along with side skirts... not a lot of time
to study what that will do for the WOS, we are going with the same drive
train and just raising the nose 1" and leaving the back where it was....
I tried to evaluate some pictures from last year and this year and it does
seem that the nose was substantially lower this year over last.... So I'm
very comfortable with what we are doing...
Keith
----- Original Message -----
From: "John Goodman" <ggl205@yahoo.com>
To: <land-speed@autox.team.net>
Sent: Tuesday, September 07, 2004 2:27 PM
Subject: Re: Bumps, Suspension, Etc.
> Keith:
>
> I thought you went to 800lbs springs (up from 400lbs)
> for SpeedWeek? Regardless, if after a spring rate
> increase your vertical chassis travel remained the
> same (before spring change) that may indicate you have
> not increased spring rate enough. Changing spring rate
> may or may not require shock vale changes. Stiffer
> springs should oscillate at different Hz but may not
> be so great a difference as to warrant changing shock
> valves. Data from your potentiometers could give you a
> clue.
>
> Are you raising the nose or lowering the rear? If you
> are raising the nose, will you not also increase the
> flow of air under the car? Do you want to do this?
> Even with some sort of diffuser/splitter at the front,
> I should think creating a high-pressure area under the
> front axle would cause lift in that region. If you are
> lowering the rear and keep the nose at roughly, the
> same ride height (lowering angle of attack) that would
> be a more comfortable situation.
>
> John
|