Jump to content
SAU Community

Recommended Posts

As some know i have a r33 gtst series 2 with 209 rwk and the wheelspin really annoys me. i want to change the diff ratio to a lower one. stand me if im correct but i think my one has a 4.36 ratio? and i think the r34gtt has a 4.11? what i want to know is, is the r34 gtt diff centre interchangable with my current one? I want one that fits straight in with no modifications, can anyone sort this out for me, even if they know something else that is interchangable also and that will handle more power if i decide to. I also want it for the better top end and lower rev range whilst on the freeway at 100kph.

many thanks :)

Link to comment
https://www.sau.com.au/forums/topic/175701-minimising-wheelspin/
Share on other sites

I ran a 270rwkw street tune for a while.

225 tyres, hardly an issue with wheelspin.

I'd be looking at the suspension, quality of the tyres, diff condition and driving style :)

im getting a set of coilovers within the next 6 months, for now i just want to change the diff as i drive alot on the freeway and the constant high revving annoys me lol

As some know i have a r33 gtst series 2 with 209 rwk and the wheelspin really annoys me. i want to change the diff ratio to a lower one. stand me if im correct but i think my one has a 4.36 ratio? and i think the r34gtt has a 4.11? what i want to know is, is the r34 gtt diff centre interchangable with my current one? I want one that fits straight in with no modifications, can anyone sort this out for me, even if they know something else that is interchangable also and that will handle more power if i decide to. I also want it for the better top end and lower rev range whilst on the freeway at 100kph.

many thanks :thumbsup:

The R33's run a 4.11:1 diff ratio; the R32's run the 4.363.

Also. A higher diff ratio is numerically lower i.e 3.7:1, a lower diff ratio is numberically higher i.e 4.3:1.

Yes a higher ratio diff will help prevent wheel spin but it does make the car feel like it takes longer to come up on boost when toodling around then mashing the throttle from a low rpm.

First gear was much more enjoyable and usable however the trade off in the snap hard on boost in second and third gear simply was not worth it.

100km/h cruising speed did drop the rev's a little but unless you drop to a 3.7:1 or there abouts its really not that noticable.

3.7:1 will have your 0-100 times increase noticably. So don't do it. I have and went straight back to a 4.3.

If the engine noise gets to you at 100km/h shove in another muffler just after the cat.

Traction, you shouldn't have issues with only 209rwkw; as others have suggested definitely take a good look at your diff, suspension and tyres. Apart from tyres which is obvious the diff's worn VLSD is usually the culprit.

One thing that prevents them being 100% interchangable is the half shafts bolt pattern.

R33 is 5bolt (1x5), R34 is 6 bolt? and S15 I can't remember. :thumbsup:

Unsure on spline; I'm almost certian if the R34 is 6bolt it will also have the larger spline.

Again... If its to reduce wheel spin then your barking up the wrong tree especially with only 209rwkw which is bugger all.

If its 'only' to drop rev's at 100km/h then yes.. BUT acceleration rate will suffer as a result.

The J30 diff isn't a simple drop in. I would expect the pumpkin to be the same as the R33 but the half shafts are different.

You will have to drop your diff center in to the J30 pumpkin and then slide in your half shafts; or grab the crown and pinion from the J30 and have it fitted to your diff housing.

Either way your up for around $300 ish for the J30 diff and another $300ish to get it working. So all up $600 ish + oil.

You really are better off putting that $600 towards a good mechanical. If you want a good 100km/h cruiser buy a family wagon. :thumbsup:

Again... If its to reduce wheel spin then your barking up the wrong tree especially with only 209rwkw which is bugger all.

If its 'only' to drop rev's at 100km/h then yes.. BUT acceleration rate will suffer as a result.

The J30 diff isn't a simple drop in. I would expect the pumpkin to be the same as the R33 but the half shafts are different.

You will have to drop your diff center in to the J30 pumpkin and then slide in your half shafts; or grab the crown and pinion from the J30 and have it fitted to your diff housing.

Either way your up for around $300 ish for the J30 diff and another $300ish to get it working. So all up $600 ish + oil.

You really are better off putting that $600 towards a good mechanical. If you want a good 100km/h cruiser buy a family wagon. :thumbsup:

i already have a family wagon lmao!!! lol. its more for rev drop than wheelspin. what is the j30 diff?

J30 is a type of nissan just like the R32 R33 etc

As I said.. before, a 3.9:1 won't drop 100km/h rpm all that noticably.

The rolling dia of your 265/35 18's is slightly larger than stock so at 100km/h you will already be reving slightly lower AND your speedo will be slightly out.

At 100km/h with your 4.11:1 diff ratio, 5th gear ratio and 265/35/18's the engine will be ticking over at :

4.1 ratio - 2551rpm

3.9:1 ratio - 2421rpm

3.7:1 ratio - 2297rpm

4.3:1 ratio that is shorter you'll be at 2708rpm

If you ran factory spec rolling dia (631.90) tyres (205/55/16) at 100km/h with stock ratio's etc you'd be ticking over at 2591rpm. So with your larger tyres you've dropped 40rpm off your 100km/h cruising speed.

Also the stock tacho reads slightly higher than it really is. :thumbsup:

So you have to ask yourself... Is 100rpmish really worth the slower/duller acceleration? I've done it and I definitely do not think so; enough so that I had the diff out a couple of weeks later and the std diff ratio shoved back in it.

thanks mate. i heard the s13 turbo auto model has a 3.9 ratio and fits straight in? correct me if im wrong

I added to my previous post with some figures. :thumbsup:

The S13 diff isn't a drop in due to its different housing. So again you will be forced to swap the ratio from that diff in to your housing. Of which will blow out ot $600 odd by the time you buy the diff and have it fitted.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Latest Posts

    • Seat of the pants assessment of the new intake: The car is way less "doughy" when hitting the loud pedal, especially off idle when stopped or in traffic, I did use a cheapo lazer thermal thingo to measure the temp around where the pod filter got its air, it was between 55 - 60°C, in saying this the car was shut off and not moving, so the OEM intake pipe was not supplying any fresh air to where the pod was when the car was at least moving A weird bonus was induction noise on the throttle in the cabin increased a bit,  I was worried that I was actually going to lose some of that induction noise I love so much, outside though, when I got the daughter to do a WOT drive by pass for me, the induction noise has increased alot when on the throttle, not quite ITB doort, but well up there I'm extremely happy with the results and have been exploring the country roads in the region  As for house mods: 1.New front fence is up and is awesome, it really upgraded how the joint looks from the street, and the added security is nice 2. Electricians have replace some interior lights, and with more lighting in the garage, a few new motion detecting lights out the front above the garage, front room, and at the front door, which I have already found heaps helpful coming and going, also now has fancy pants CCTV all round the house The only hold point for power though is the solar and batteries due to supply issues, although this will happen over the next few weeks 3. I have done a heap of landscaping out the front and I'm almost ready to do a new small retaining wall with some nice blocks to replace the brick and cemented in rocks around the raised garden beds cemented in river stone "was the fashion at the time" the house was built. I currently have a pallet of retaining wall blocks and 2 bulka bags of 20mm blue metal to replace the wood chip that is in the raised garden beds around the house 4. I now have 3 big raised garden beds for out the back to grow some vegetables, about 70cm high, 200cm long and 100cm wide 5. My 2 compost bins are already pretty full with brown, green and kitchen waste from the landscaping I'vedone so far, but they will probably take a few months to break down, so anything else that gets chopped, trimmed, and kitchen waste will just start filling the base of the raised garden beds to about 30cm before I start throwing 40cm of good compost, and stuff, for the vegetables to grow in, I'll need a few ton of compost and soil, but the local supplier can sent me bulka bags of the stuff Basically the logs, wood chips and a few strategically placed rocks for drainage, will give the beds some good organic materials down low to break down over time, and they will hold moisture during the warmer months to save the water in my big arse water tank if we don't get alot of rain So, all in all, the car and house mods are going well, and I'm really enjoying being retired, I sleep in too 0700 and slowly plod around inside until I feel like actually doing anything, and only work in the yard for as long as want, which has actually been alot over the last few weeks,  although when you look at it, it seems that not a huge amount of work has been done,  until I look at the before I started the work pics Happy days and good times indeed 
    • hahaha yeah. Plan is to get side skirts and probably just rear pods. But going to do them one-by-one. I've got a set that I really like from RHDJapen, but that one isn't shipped to AU. So need to find someone who can get it for me
    • Here's an idea, answer the questions I asked you as they are trying to work out WHY the LSD will be binding up in a straight line.
    • You haven't driven many modern cars then have you? Most of them have sfa steering feel with their stupid electric bullshit steering systems.
×
×
  • Create New...