Gaz gold pro and tyre rubbing

[Chimp871]

So changed the brake fluid today which was over 4%!

Noticed that the off side tyre is running against the arch (you can see the shoulder has been scored in pic). I slackened off the adjuster to increase height which only made a small difference and it's still rubbing on some road bumps! The damper setting is -5 off the + max.

The near side is also slightly rubbing but less. The adjuster is the same at -5 of max +. I also slackened off spring retainer to increase height. Marginal change.

The rear tyres are big at 255/35R18.

I don't know spring rate as I've just got it.

What are my options? Do Gaz sell a longer spring?

Edited by Chimp871 on Tuesday 3rd October 19:30

[PhilH42]

Slackened it off to raise the ride height?

[DCerebrate]

I had same size tyres and very soft suspension on rear - bottoming out on some B roads (helped by adjusting gas gold pros). But the tyres didn't rub at any time. You have non-standard wheels - do you have a note of or can you research the wheel width and offset?

[Chimp871]

It's all new so I need to measure the rim width or check for part numbers/markings, if it's non-std/offset then then that's a problem! There doesn't appear to be a spacer on the rear, I'll check though.

first set of adjustables for me so I unscrewed the spring retainer to extend the spring. Makes sense right to me this would increase the ride height.

[PhilH42]

The two rings (under) the spring call them 1 upper and 2 lower.

Ring 2 (Lock ring) clockwise to release ring 1, then ring 1 anti-clockwise to increase ride height or clockwise to lower.



Then ring 2 back to lock ring 1 once set correctly and torque.

Edited by PhilH42 on Tuesday 3rd October 20:57

[Chimp871]

Thanks! Think I'm being a numpty....

So compressing the spring INCREASES the ride height......?

[PhilH42]

Yup thats it.

What's your initial thoughts on the Cerb now you're getting familiar?

[TwinKam]

Chimp871 said:

Thanks! Think I'm being a numpty....

So compressing the spring INCREASES the ride height......?

You're not compressing the springs (the car's weight does that and it remains constant), you're just raising the springs' lower mountings which effectively lifts the body (sprung mass) away from the wheels (unsprung mass).

[fatjon]

Did you check the wheel offsets. I spent ages trying to fix this problem with 255/35s all round before I noticed the fronts and rears have different offsets. Maybe this is only with Spiders though, not sure.

[Jhonno]

You could take a sander to the inner arch to make some clearance if you wanted to keep the wheels..

I suspect the wheels have a lower offset than standard.

Also sometimes different brands of tyres come up at different widths for the same 255 marking.

[FarmyardPants]

A bit more negative camber will move the top edge of the wheel inwards a little which helps if that is an option that appeals. Easy to adjust, just one nut/bolt to loosen.

[Jhonno]

FarmyardPants said:

A bit more negative camber will move the top edge of the wheel inwards a little which helps if that is an option that appeals. Easy to adjust, just one nut/bolt to loosen.

Yep! Another option.. Factory camber is probably a bit conservative..

[mk1fan]

You may already realise this but, as you didn't understand how to adjust the height of a coilover, jack the car up so the wheel is off the ground before adjusting the spring. Takes the load [of the car] off it.

Also match it on the other side. On a production car I'd suggest measuring from centre of wheel to top of wheel arch but TVRs ain't built like that

[TwinKam]

mk1fan said:

You may already realise this but, as you didn't understand how to adjust the height of a coilover, jack the car up so the wheel is off the ground before adjusting the spring. Takes the load [of the car] off it.

Also match it on the other side. On a production car I'd suggest measuring from centre of wheel to top of wheel arch but TVRs ain't built like that

Apologies for being pedantic and stating the bleedin' obvious but... it needs to be jacked under the chassis, not under any part of the suspension, until the wheel is clear of the ground. The suspension will then be 'at full droop' and the load of the car will be off the spring .

[mk1fan]

Very true.

[1485]

has the car been retro fitted with spiders? the cerbera from factory was fitted with FRONT rims all round, not like the tuscan which had front rims and rear rims, this was to stop rubbing on the inner arch, you can tell by the gap between the disc centre and wheel( inbetween the wheel nuts ) you can see the difference from fronts to rears, just a thought??????

[mac315p]

1485 said:

has the car been retro fitted with spiders?

I think the OP has 18" Rota's fitted judging by the picture above (and what was said in another thread!)

1485 said:

the cerbera from factory was fitted with FRONT rims all round

For Spiders that is possibly largely true, not necessarily for RL7's, Saturns etc.

The car does look pretty low - I'll never understand why people lower a Cerbera that is used on 'real' roads. I certainly need my suspension travel and a bit of height on the roads round here (not to mention the drive up to the farm!)

I'd get it back to standard height and put the OEM wheels on that you mention you got with the car, but I'm in the 'keep it as it was built' club!

Edited by mac315p on Thursday 5th October 08:06

[Byker28i]

I have mine set quite high and soft, for comfort driving around our poorly maintained roads.
I measure mine from the outrigger corners to the floor, 120mm front, 130mm rear

[Jhonno]

mac315p said:

For Spiders that is possibly largely true, not necessarily for RL7's, Saturns etc.

The car does look pretty low - I'll never understand why people lower a Cerbera that is used on 'real' roads. I certainly need my suspension travel and a bit of height on the roads round here (not to mention the drive up to the farm!)

I'd get it back to standard height and put the OEM wheels on that you mention you got with the car, but I'm in the 'keep it as it was built' club!

Edited by mac315p on Thursday 5th October 08:06

TBH, I wouldn't class farm roads as real roads.. Mine is lower than standard, but copes fine with all the A and B roads around here.

It also looks great on the Rotas...

Edited by Jhonno on Thursday 5th October 08:34

[ukkid35]

If you want to see what happens when the ride height is too low

https://vimeo.com/185947260

This was due to a failed attempt at corner weighting by a well respected indie