Spring rate for Vixen S2

[becbunsen]

Hello,

I'm restoring a Vixen TVR S2. I bought 6 AVO shock absorbers (ref 418) to replace the genuine but coil springs on these shock absorber must be shorter than the genuine. (14' free lenght for the genuine, i think 12' must be good for the AVO)
ID is 2,25' on the front, 2,75' on the rear with a cup but i can replace by 2,25.

12' free lenght and 2,25 ID is a standart size and i can find it easily (AVO, Burton, demon tweeks,...) but i don't know which rate i can take for fast road use.

On the john upman site, there is genuine rate but i don't know if these are the good rate and i probably want something a little harder
http://www.zen11896.zen.co.uk/vixen/par ... nsion.html

You can see difference beetween genuine and AVO with photos on my post on french TVR forum
http://www.tvrcarclub-france.net/forum/viewtopic.p...

Thank you for your answers and sorry for my poor english
Julien

[becbunsen]

Thank you for yours answers

Heightswitch, i'm agree with you for a 180Lbs/inch rate for the front but i'm asking if the rear shoud be less hard.

In fact, i was ready to buy 200 at front and 140 at rear but i made my choice only with web search...
Most of setting i saw have the front stiffer than the rear but i don't know if difference between front and rear (200,140) is not too much.

For 2 or 4 rear springs, it's real question: it's more difficult to find a good rate with 4 springs (it's also more difficult to find little rate springs) but i think the upright suffer less.
(On my car, i have 4 rear schock absorber but only 2 springs at the forward point. The 2 rear upright was broken near the pivot bar (pivot bar was twisted))

I will contact steve reid but i'm taking always your opinion.

Regards

Julien

[becbunsen]

Thank you Neil,

Edited by becbunsen on Monday 15th December 09:03

[becbunsen]

Thank You TVRbuell.

It will help me to make my opinion.

[becbunsen]

Another question about spring for AVO shock absorbers:
Which lenght to use?

Max lenght on the Avo is 11'
If i take 12'free lenght spring. spring will be 1' precharged to fit. I wonder if the car will down enough only with his weight. (depending of spring rate: with high rate spring, car will probably stay too high)

I think it's better to fit 10' free lenght and adjust the lenght on the shock absorber. In this case, the rate can(must?) be a little more stiffer.

It's only my imagination and i'm looking for spécialist opinion

Thank's

Julien