Z31 Non Turbo R200 Diff

[260DET]

Which should be a 3.7:1 ratio, 37:10 teeth. Must be in sound condition, minor oil leaks OK, PM best.

[PeterH]

Hi Richard...I have an R200 3.7 but I think it came out of a 260Z 2+2...it came with my car when I bought it....not sure about the Z31 differences.

 

Peter 

[PZG302]

If a S14 diff will suit your needs I have a standard one from one of my old shells that you can take off my hands when I get back from Indo in September.

 

From memory they are around a 3.7:1 

Edited August 21, 2016 by PZG302

[260DET]

It's a long nose type, the two large studs at the back are 85mm apart. Pic below.

 

 

 

[PeterH]

 

and yep...85 mm centres

[PZG302]

Ah, OK S14 will be short nose, but perfect ratio.

 

Offer is still there if you want it. I won't be using it now I have my my 4.3 diff set up in the shell.

[260DET]

4.3 is a bit low for your car isn't it?  The Zed with a 3.9 and VG30DET at Lakeside used to go through the kink in 5th at 200kph+ so I would have thought no lower than 4.1 for yours, it should be faster too.

 

For general information then it looks like the Z31 uses a standard type long nose R200 diff, ratios are 3.545 for the turbo and 3.7 NA.

[PZG302]

Nope, 4.3 is the best ratio for the tracks I will run at. Only track that it may be an issue is Bathurst, and I can't see me running there anytime soon with work.

 

With the rules I run to and limitations on turbos and manifolds I am better off having something that will punch out of the turns and accelerate than something with a long top end. 

 

With the 4.3 diff, top speed by the gear calc program with the tyres I run, 240 or 270, 640 or 650, 18's will see a top speed of around 220km/h in 4th, and an achievable 230 or so in 5th, more than enough for the three Queensland tracks, plus SMP and Wakefield if I race down south.

[dat2kman]

Matty's on the money,,,,,,!

Punch out the corners is vital, and Bathurst, every corner bar the on/off/on/off from Skyline to Forest's, is all uphill.

Bit useless going to all the effort and just only managing to keep momentum only on corner exits.

[260DET]

I've always found that having the right gear available in every situation to be most important, that and not over revving the engine on the fastest part of the circuit. Obviously the diff ratio is relevant for the latter but otherwise, providing the 'right gear' aspect is satisfied, the diff ratio is irrelevant.

[260DET]

Have bought a diff from Peter so presently am all diffed up.