Rebody Mittaws 250 SWB Coupe Build

DaveP

Zorg Guru (III)
British Zeds
Joined
Mar 26, 2016
Points
128
Location
Reading
Model of Z
Z3 2.2 Kobra rebody (see pic)
All, if you are interested in BC Racing coilovers for Rebody cars
Try contacting ClassicCoachWorks.org as they are an agent for them and can offer advice. They have fitted them in their builds.
I have them on my Kobra and no where down low on their adjustment. They are not as nice as Bilsteins etc but you do have the flexibility
 

mittaw

Dedicated Member
Joined
Apr 1, 2024
Points
29
Why? Are your new wheels/tyres a larger circumference than the old? If so, how much by?
The wheels are only 15 inch but the wall on tyres are taller so i suspect it will go up a little . Not much but I suspect some.
 

Pond

Zorg Guru (III)
British Zeds
Joined
Dec 26, 2016
Points
144
Location
Spaldingski, Lincs
Model of Z
Z3 project and E89 Z4
The wheels are only 15 inch but the wall on tyres are taller so i suspect it will go up a little . Not much but I suspect some.
What profile tyres? If 65 they should be around the same. My new wires are 15" with 205/65 tyres. The existing are 17" with 225/45 and 245/40. The RR is slightly bigger on the new wheels but the arch gap is only 9mm less.
I need to find a LOT more than 9mm on the rear to get it to sit right TBH......hence the idea of coilovers.
 

mittaw

Dedicated Member
Joined
Apr 1, 2024
Points
29
What profile tyres? If 65 they should be around the same. My new wires are 15" with 205/65 tyres. The existing are 17" with 225/45 and 245/40. The RR is slightly bigger on the new wheels but the arch gap is only 9mm less.
I need to find a LOT more than 9mm on the rear to get it to sit right TBH......hence the idea of coilovers.
My tyres are Blockley 205/70VR15W so the tyre wall is just slight taller. Not much but a little. I should hopefully have them on next week so will post up image and if need adjusting
 

Pond

Zorg Guru (III)
British Zeds
Joined
Dec 26, 2016
Points
144
Location
Spaldingski, Lincs
Model of Z
Z3 project and E89 Z4
My tyres are Blockley 205/70VR15W so the tyre wall is just slight taller. Not much but a little. I should hopefully have them on next week so will post up image and if need adjusting
That's around 6% larger circumference than standard. Just be careful they don't adversely affect your ASC/DSC. There is a theory that anything more than 3-4% different to standard could potentially cause problems. And of course your speedo will read miles out.
 

Duncodin

Zorg Guru (IV)
Supporter
Joined
Sep 8, 2021
Points
159
Location
Pontrhydyrun - in Crow Valley
Model of Z
M44 FrankenZed
That's around 6% larger circumference than standard. Just be careful they don't adversely affect your ASC/DSC. There is a theory that anything more than 3-4% different to standard could potentially cause problems. And of course your speedo will read miles out.
I suppose if rear wheels were humongous and front wheels where tiny then the computer would see the different speeds and be confused and potentially raise an ASC alarm.

But if all 4 wheels are the same then the computer only sees the wheel rotations. The speedo will be wrong but the computer won't know that because the only thing it sees is rotations without knowing how far the car actually travels per rotation.
 

mittaw

Dedicated Member
Joined
Apr 1, 2024
Points
29
I suppose if rear wheels were humongous and front wheels where tiny then the computer would see the different speeds and be confused and potentially raise an ASC alarm.

But if all 4 wheels are the same then the computer only sees the wheel rotations. The speedo will be wrong but the computer won't know that because the only thing it sees is rotations without knowing how far the car actually travels per rotation.
As above, I understand so long as the wheels are the same on all four corners the ratio stays the same and doesnt trip the computer to thinking wheels are turing at different rates.
 
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