172 vs 172 Cup

[KieranM]

I'm looking to build a track car to compete in SLS next year and I am not sure if buying a 172 Cup is worth the extra money. The car will be getting all interior and heaters stripped out, poly windows, cage etc. It will also be getting coilovers. Am I right in thinking that the only thing left on the car that is different between a 172 Cup and a normal 172 would be the lack of ABS and TC?

 

[shiftspark]

Yep pretty much, if your stripping it completely then no point in buying a cup.

 

[shiftspark]

Oh and air con

 

[Canary172]

Wider track too (if that's a priority)

 

[KieranM]

Wider track too (if that's a priority)

What's different to achieve the wider track?

 

[STEVE.M]

What's different to achieve the wider track?

The wheels have a different ET.
48.5 for PH2, 38 for Cup.

 

[Mertin]

Driveshafts are different lengths on the cup are they not, so must be a difference elsewhere for the wider track?
They have more castor due to the balljoint position on the front wishbone but these can be fitted to a non cup car anyway.
Rear has -2deg camber, again can be done on any car with camber shims

 

[Canary172]

Driveshafts are different lengths on the cup are they not, so must be a difference elsewhere for the wider track?
They have more castor due to the balljoint position on the front wishbone but these can be fitted to a non cup car anyway.
Rear has -2deg camber, again can be done on any car with camber shims

Apparently the lower suspension arm interface on the Cup's subframe is further outboard in comparison to a standard 172. As a result the distance from hub to gearbox is greater which requires the driveshafts to be longer.

 

[KieranM]

So to get to cup spec I'd need to change the lower arms and driveshafts, or would I need the subframe too?

 

[massiveCoRbyn]

Apparently the lower suspension arm interface on the Cup's subframe is further outboard in comparison to a standard 172. As a result the distance from hub to gearbox is greater which requires the driveshafts to be longer.

@midge has measured subframes and says that there isn't a difference

 

[midge]

I had a pile of 8 subrames here, from various sport models and there is no difference in subframes, the only one that has the holes further in is a ph1 one.

 

[midge]

Oh Steve M was round one day with a tape measure to, so he can also back that up.

 

[KieranM]

So the only chassis differences is the lower arms?

 

[Goodj]

Get on ebay and you'll probably find a 1/2 dozen other ex-CS Clios that have had most this done already, they pass through here on an almost bi-monthly basis.
You might need to pull out some carpet, or remove some "tasteful" mods for someones ex road/track 'weapon', but better that than destroying an un-modified example

 

[STEVE.M]

172 cup had 1 piece rh driveshaft.

 

[JakeyA]

Cup had 5mm thicker rear stub axle bases/mounting flange aswell "apparently"

Is that where it gets the camber from of is that a cup spec rear beam?

 

[midge]

I have noticed differences in stub axles but as far as i know thats just another phase difference not cup difference.

 

[bloke]

fwir 182 has the thicker stub axle?