Diff ratio for R200

[Wyn]

On the subject of diffs

Can someone verify what these numbers indicate?

The crown wheel is marked 39.11C - D52.11. I take it that is a 3.9.1 ratio?

It also has painted 10L 77.2 dunno what that is for tho

 

[Mr.G]

That info tells us that the ring gear has 39 teeth and the pinion gear has 11 teeth, count them to be sure.. If you divide the ring gear teeth by the pinion gear teeth you get the final drive ratio, which should be a 3.54!

 

[Wyn]

should be a 3.54!

Cool just what I wanted

 

[Wyn]

Do 260-280 manual shafts inter change diff end wise?

Be it bolt on or pop out CV type?

I.e. will later 280 CV shafts fit an early 260 diff?


btw, Anyone got a lsd unit they want to part with for an R200

 

[zedhead260]

Do 260-280 manual shafts inter change diff end wise?

Be it bolt on or pop out CV type?

I.e. will later 280 CV shafts fit an early 260 diff?

The output flanges for shafts are different to the output flanges for CV joints. It's only the later 280ZX's that had CV joints.

Why do people want CV joints ?

btw, Anyone got a lsd unit they want to part with for an R200

LOL

 

[grolls]

http://cgi.ebay.com/ebaymotors/Datsun-240Z-280ZX-300ZX-R200-LSD-Limited-Slip-NR_W0QQitemZ8020722902QQcategoryZ33731QQrdZ1QQcmdZViewItem


flogging the shafts too, oooohhhhh how much posted? ouch i think

 

[Albrecht]

I have some LSD-equipped R200 diff units for sale at the moment.

All are complete with output shafts and the correct 'flat' rear covers that allow a bolt-in fit to the S30-series Z ( not the finned cover type ).

Selected from a trusted source in Japan and imported personally. They are in excellent condition.

I have THREE units:

4.375:1 ratio x 1pc.
4.625:1 ratio x 2pcs.

Might put these in the site's 'Classified' section soon after I take some photos........

Not cheap though I'm afraid.

 

[Wyn]

The output flanges for shafts are different to the output flanges for CV joints.
Why do people want CV joints ?

Do you mean the outer joint or inner
I meant will the 280 shaft engage into a 260 diff?

 

[Wyn]

I have THREE units:

4.375:1 ratio x 1pc.
4.625:1 ratio x 2pcs.

Might put these in the site's 'Classified' section soon after I take some photos........

Not cheap though I'm afraid.

What are those from to have those ratios? Also any chance you could put a guide line price up what those might make.

 

[Albrecht]

What are those from to have those ratios? Also any chance you could put a guide line price up what those might make.

They are proper 'Sports Option' ratios for motorsport, and the LSD units are NISMO clutch type.

Guide line prices? I've sold this type of unit many times before here in the UK, and they usually fetch between £850 and £1,000 or so ( depending on ratio and who is buying....... ). Free personal delivery within a reasonable radius of London.

You have to bear in mind that these units come all the way from Japan by Air freight, are not cheap in the first place, and are in premium condition.

 

[Mr.G]

Albrecht - what exactly would be the driving characteristics of a 4.625 as opposed to a 3.9?

Good to have you back BTW - where you been?

 

[Albrecht]

Albrecht - what exactly would be the driving characteristics of a 4.625 as opposed to a 3.9?

Hi George,
Er, one word - BUSY

You will tend to find that these higher ( numerical ) diff ratios have the effect of closing up the gear ratios in the gearbox, so when driving fast you can tend to feel like you are 'rowing' the car along on the stick........

I had a 4.875 ratio LSD in my old red car for a few months of commuting, and it was a total gas. Hard to live with long-term but a complete giggle for a while. I then switched to 4.375 ratio which was still amazing fun but was also bearable on long journeys. Kept the 4.375 in until I sold the car, and took it out just before selling. Put a 3.7 open diff in the car and it felt like a lifeless slug in comparison. You'd be amazed at the way these cars can change character completely with a diff ratio change and a nice LSD.

Good to have you back BTW - where you been?

Have been in Japan on business. Still suffering from jet lag . Will be back there again at the end of this month.

 

[Ian Patmore]

Good to have you back Albrecht, though it was not all business and no play??!! A good time had I presume?

Cheers
Ian

 

[Albrecht]

Hello Ian,

Well, it was ostensibly a business trip - but I did manage to sneak off on Saturday and Sunday to join the NP35 pit crew for the NISMO Festival at the revamped Fuji Speedway.......

Saturday ( set-up and practice day ) was crisp and sunny, and Sunday ( the main event day ) was lovely in the morning until it started snowing around noon. We had to stay until the very end to take part in the finale, pack the cars away in the transporters and get all our pit gear back into the truck. Had an interesting drive back through the mountains in the fresh snow.

Here are a couple of pics of the cars that we were running out of the two NP35 pit garages:
( sorry George, this thread has been well and truly hijacked now........ )

 

[SeanDezart]

What a blessed person you are !

Best diff for a performance road car - 3.7 or 3.9 ?

 

[Albrecht]

Best diff for a performance road car - 3.7 or 3.9 ?

Sean,
Neither of those in my opinion......

If you are using an Overdrive transmission ( most are ) then I reckon a 4.375 R200 with LSD is the best all-rounder.

But most early Z owners seem to be scared to use their revs, and appear to want to sit on the motorway droning along at 2500 rpm in fifth.

And you mentioned the 'P' word.........

 

[SeanDezart]

I've got one of 'your' R200 LSDs in mine but with a 3.9 ! Figured it was the best compromise between ....droning along and screaming the balls of - there are a lot of m-ways here and if I want to meet up with almost anybody, I gotta drive some klicks man !

Last news from the latest DJR stroker is 238 bhp at the wheels ! That damned P word !!! He just talked me into one of his bolt on rear disc set-ups too !

 

[Albrecht]

I've got one of 'your' R200 LSDs in mine but with a 3.9 ! Figured it was the best compromise between ....droning along and screaming the balls of - there are a lot of m-ways here and if I want to meet up with almost anybody, I gotta drive some klicks man !

Well, the motorway mileage thing will always be a factor - but you said the 'P' word! In the end, all 'P'erformance road cars have to be a compromise in certain areas I suppose.

For sure a 3.9 will feel MILES better than a 3.7 or 3.54 as an all-rounder. You are using 15-inch wheels I seem to remember?

I can get hold of 3.154:1 and 5.143:1 crownwheel and Pinion gear sets for the long-case R200 if anybody wants to go to either extreme........

 

[SeanDezart]

I can get hold of 3.154:1 and 5.143:1 crownwheel and Pinion gear sets for the long-case R200 if anybody wants to go to either extreme........

Keep talking, what are the likely revs at 80 mph using each of all of the crownwheel and Pinion gear sets, ie 3.54, 3.7, 3.9, 4.1 etc ?

15x8 wheels with 225/60 tyres - yes !

 

[Albrecht]

Keep talking, what are the likely revs at 80 mph using each of all of the crownwheel and Pinion gear sets, ie 3.54, 3.7, 3.9, 4.1 etc ?

15x8 wheels with 225/60 tyres - yes !

There are lots of calculating programs on the net for you to use Sean.