Z3 Prop / Differential Question

[Asad.C]

Hi guys, I have a Z3 2.0.

I may be getting a good deal on a S50B32 complete with gearbox, prop, loom, ECU etc out of a Z3M for a swap into mine.

Question I have is, is the prop flange on a standard Z3 and Z3m the same, alternatively is the input flange size the same on a Z3M LSD compared to a standard Diff.

Basically the guy wants bonkers money for the diff and shafts, he wants almost as much for the front and rear axle as he does for selling me the engine and stuff. So I want to know if I can bolt the Z3m prop up to my standard 2.0 diff.

Thanks in advance.

 

[Pingu]

Propshaft lengths

2.0 std diff = 1274mm
2.0 lsd diff = 1264mm

M = 1240mm

 

[Asad.C]

Propshaft lengths

2.0 std diff = 1274mm
2.0 lsd diff = 1264mm

M = 1240mm

Thanks for the info, what I'm actually after is. If a different props will bolt up to different diffs. Or is there a difference in bolt pattern or diameter.

I know there is a difference in the drive shaft ends but wondered if the end where the prop connects to is also different.

 

[Pingu]

I think the prop flange will fit.

Check using www.realoem.com

Open two tabs on your PC and have an M roadster in one tab and your car in the other, and just compare the parts.

 

[Asad.C]

I think the prop flange will fit.

Check using www.realoem.com

Open two tabs on your PC and have an M roadster in one tab and your car in the other, and just compare the parts.

Thanks, that's exactly what I did this morning lol. Looks like it will fit.

 

[t-tony]

But will the back end on a 2.0 Z3 cope with a fair amount of extra ///M power?

Tony.

 

[Pingu]

But will the back end on a 2.0 Z3 cope with a fair amount of extra ///M power?

Tony.

What could be a factor is that the diffs have different ratios. The 2.0 diff is shorter, so the acceleration will be faster, and the forces will be larger.

Both cars have the same rear end monocoque. The M has shorter driveshafts which can take a higher torque. The M has strengthened suspension arms.

 

[Asad.C]

But will the back end on a 2.0 Z3 cope with a fair amount of extra ///M power?

Tony.

Only one way to find out lol. I'm not paying the guy 4.5k for the front and rear subframe complete with diff, arms and brakes.

Almost as much as he wants for S50B32, prop, Speedo, loom, gearbox all out of a Z3M.

 

[Asad.C]

What could be a factor is that the diffs have different ratios. The 2.0 diff is shorter, so the acceleration will be faster, and the forces will be larger.

Both cars have the same rear end monocoque. The M has shorter driveshafts which can take a higher torque. The M has strengthened suspension arms.

Thanks for the info, I'm thinking to get my own diff rebuilt with LSD rather than paying dumb prices for an OEM one.

 

[Pingu]

To be fair, the whole lot for £9k isn't that bad.

You have definitely got a bargain so far. The other lot is a fair price.

What is the donor car like? It must be in fairly good condition to have all those parts available.

 

[Asad.C]

To be fair, the whole lot for £9k isn't that bad.

You have definitely got a bargain so far. The other lot is a fair price.

What is the donor car like? It must be in fairly good condition to have all those parts available.

It's a full car. He bought it from someone that took a couple of bits off of it. I looked it up. Sorn since 2014 n last MOT was 2014 at 64k miles so it seems like a very good deal, always wanted to get more power but I didn't want to do a random engine swap, wanted the M or nothing lol. The car currently has every suspension mod possible so it handles like it's on rails on the track, people can't catch me in the corners but I can't pass a single thing on the straights.

 

[Andyboy]

The 2.0 has a small case Type 168 diff and an M3 engine will destroy that in short order. Or it will snap a driveshaft like a carrot.

The least you need is a complete 3.0 rear suspension and Type 188 Torsen diff. You can fit the input flange to that - it's the same as an E34 525i.

 

[Asad.C]

The 2.0 has a small case Type 168 diff and an M3 engine will destroy that in short order. Or it will snap a driveshaft like a carrot.

The least you need is a complete 3.0 rear suspension and Type 188 Torsen diff. You can fit the input flange to that - it's the same as an E34 525i.

Thanks for the info

 

[the Nefyn cat]

Boot floors are vastly over-rated anyway.