Don/Skip
Vixen S2s all had six shocks and 4 springs and S3s had 4 shocks and 4
springs. I don't know about 2500s.
I read in "Success against the odds" that the extra damper was first
added to the Grantura to prevent acceleration wind up.
It is not uncommon for the pivot bar at the bottom of the rear casting
to fail and I think therefore that there is a big advantage to using
four springs at half the rate on the back. This is what I intend to do
with my S3 - but first I have to remove the pivot bars and fit longer
ones.
Russell
---------Included Message----------
>Date: Sun, 11 Mar 2001 17:39:34 -0800
>From: Skip Gurnee <skip47@home.com>
>Reply-To: Skip Gurnee <skip47@home.com>
>To: DonDavis@aol.com, tvr@autox.team.net
>Subject: Re: source for vixen shocks
>
>Don-
>I shoulda mentioned that I bought my Vixen new. I'm assuming they all
>came with six shocks, but the dealer may have added two at the rear.
>I'm currently running a couple of street Konis without springs at the
>rear, ahead of the axle, with the racing shocks and springs behind the
>axle, just to keep the same configuration. It would work without the
>extra shocks, but there MAY be some issues with suspension twist, and
>because the thing handles well I'm leaving it be.
>-S.
>
>Skip Gurnee wrote:
>>
>> Don-
>> Couldn't get to look at Nitron; the ronchampion website refused
>> connection and a search on "nitron" came up with a fertilizer
company...
>>
>> I just dug down in the far depths of my storage shed, and came up
with
>> my OEM springs, the dimensions of which are as follows:
>> Front - free length 14", coil dia. 3", wire dia. .405, 15 1/2 free
>> coils.
>> Rear - free length 13 1/2, coil dia. 3 1/2", wire dia. .440, 10 1/2
free
>> coils.
>> Both front and rear are flattened and ground on the ends.
>> The Konis I was using are P/N 80R1786.
>>
>> Without getting into the formulas, if you have FEWER free coils, the
>> spring is stiffer. The heavier the wire, the stiffer the spring.
The
>> larger the coil diameter, the softer the spring. You can see that
there
>> are several ways to create just the spring rate you're looking for
by
>> varying any of the parameters. If you're interested in the
calculations,
>> you can go to Fred Puhn's book "How to make your car handle", or
>> similar.
>>
>> My Vixen came through with four springs and six shocks; two on each
rear
>> wheel, only one with a spring around it. I'm not sure that's
optimum,
>> but you can run two springs on each rear corner, just make them half
as
>> stiff as one would be. If you ran 6 identical springs, the car would
be
>> too stiff at the rear, which would cause fairly severe oversteer.
>>
>> I gotta clean that storage shed out....
>> Best,
>> Skip
>
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