Tyre pressure!
Tyre pressure!
Author
Discussion

JnP

Original Poster:

340 posts

181 months

Thursday 19th July 2012
quotequote all
I've seen in the handbook that the pressure needs to be 25 and 28 PSI, is it normal that it's so much less then a "normal" car?

I've always seen 35 all round in my regular cars.

NorfolkSteve

100 posts

215 months

Thursday 19th July 2012
quotequote all
TVR's have always had relatively low tyre pressures (my previous '90's S was 22 frt, 24 rr).

This is because they use relatively large tyres compared to their weight. Hence the stiffness of the tyre would be too great with a more typical tyre pressure (as used by a heavier car) and the ride comfort would be rubbish.

Quietlybonkers

22,189 posts

168 months

Thursday 19th July 2012
quotequote all
I suggest trying it on a bumpy road with a deep ditch either side with the rears at 35.......and then if it isn't already in the ditch, try it again with the rears as suggested at about 24/25. Then you will see which is best. I know, it seems wrong if you, like me, also drive a repmobile, but it will handle a hell of a lot better.

If it still feels at all unpredictable, and especially if the suspension joints have been replaced recently, I would suggest a full four wheel alignment might improve things. Worth the 60 quid or so. My Chimaera was a nightmare the day i collected it from the dealer, and was a whole lot better after those two issues were sorted.smile

PascalBuyens

2,868 posts

306 months

Thursday 19th July 2012
quotequote all
JnP said:
I've seen in the handbook that the pressure needs to be 25 and 28 PSI, is it normal that it's so much less then a "normal" car?

I've always seen 35 all round in my regular cars.
Yes, normal, as they're low weight cars. Putting the tyes on 35psi will make you feel a little bouncy biggrin

geoffphead

637 posts

225 months

Thursday 19th July 2012
quotequote all
35 will have you enjoying the scenery up close and personal, 23 and 24 in mine and I also have them filled with nitrogen which doesnt alter hot or cold. My car is much more planted.

Cockey

1,387 posts

252 months

Friday 20th July 2012
quotequote all
Where do you go to get nitrogen for tyres? I've never seen it offered at tyre places before, but then again I've never looked out for it either.

JnP

Original Poster:

340 posts

181 months

Friday 20th July 2012
quotequote all
Thanks for the advice everyone, I checked out the Lotus Elise for its tyre pressure, seems to be the same as the Tiv more or less, I then figured out it had to do with weight smile and you guys confirmed it.


I'll try to get the geometry done tomorrow (car going on a 12k)