Wez Posted August 27, 2008 Share Posted August 27, 2008 Hey All, Does anyone know what ring and pinion gear ratios are available for the larger style 6 speed diff casing. PHR offer a 4.27:1 set which would knock approx 40mph off the top speed but I think this is for the smaller auto casing only. Quote Link to comment Share on other sites More sharing options...
Wez Posted August 27, 2008 Author Share Posted August 27, 2008 I think the stock JDM is 41201-80055 3.27 Gear Set 6 Speed Quote Link to comment Share on other sites More sharing options...
bolarbag Posted August 27, 2008 Share Posted August 27, 2008 Am sure this was discussed over on SF, I dont really recall an outcome - so probably not:( Quote Link to comment Share on other sites More sharing options...
Wez Posted August 27, 2008 Author Share Posted August 27, 2008 Infos on the mk4 trans and diff: ===================================================== 6 Speed Manual Transmission Specifications (JZA80) Gearbox Model V160 (5/93-8/97) / Gearbox Model V161 (9/97-7/02) First 3.827 / 3.724 Second 2.360 / 2.246 Third 1.685 / 1.541 Fourth 1.312 / 1.205 Fifth 1.000 / 1.000 Sixth 0.793 / 0.818 Reverse 3.280 / 3.192 Lubricant Capacity - Gearbox 1.8 Litres - Oil specifications Toyota V160 Gear oil or Castrol Transmax Z Final Drive Ratio 3.266* - - Differential Code B03B (5/93 - 5/96) A03B (5/96 - 7/02) A03B (5/96 - 7/02) Drive Pinion - Number of teeth 15 - 15 Ring Gear - Number of teeth 47 - 47 Ring Gear size 220mm 200mm 200mm Driveshaft Diameter 29.15mm - - Lubricant Capacity - Differential 1.35 Litres - - Oil specifications Standard Non-LSD API GL5 Gear Lube *3.133 Ratio on Export 6 Speed Supra. Now...about mk4's differentials There are 2 differential sizes in the JZA80, the most common is the A series which runs a 200mm crown wheel which was found in the 2JZ-GE manual and automatic as well as the 2JZ-GTE automatic and in the manual 2JZ-GTE from 5/96 up until 7/02 when the JZA80 was no longer produced. The following ratios are available for the A series diff - 3.266, 3.769 & 4.083. Then there is the B series which runs a 220mm crown wheel. It was found in the 6speed 2JZ-GTE from 5/93 up until the 5/96 where it was discontinued and replaced with the smaller A series. There was only ever 2 ratios offered on the B series diff - Export JZA80's received the 3.133 whilst the JDM ran a slightly shorter 3.266 ratio. Both of the A & B series run a Type 1 Torsen differential up until the 5/96 when the Type 2 Torsen was introduced. B Series dimensions ------------------------------ Differential Case OD 133mm Element Gear Length 61.90mm Spur Gear OD 36mm Worm wheel OD 33mm Side Shaft OD 37.80mm Side Shaft spline count 35 A Series dimensions ------------------------------- Differential Case OD 123mm Element Gear Length 57.1mm Spur Gear OD 33.3 Worm wheel OD 30.5mm Side Shaft OD 33.70mm Side Shaft spline count 30 Quote Link to comment Share on other sites More sharing options...
Wez Posted August 27, 2008 Author Share Posted August 27, 2008 On automatic cars the diff can be upgraded to a 4.27:1 ring and pinion, the factory automatic ratio is 3.77:1 Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 27, 2008 Share Posted August 27, 2008 http://www.mkivsupra.net/vbb/showthread.php?t=143043&highlight=diff+ratio The diff I had is sold (to Paul Whiffin, not sure if he used it or not). Quote Link to comment Share on other sites More sharing options...
Wez Posted August 27, 2008 Author Share Posted August 27, 2008 Nic posted this nice table Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 27, 2008 Share Posted August 27, 2008 Ideally you probably want something that gives about 145 / 150 MPH at 6500 in 6th. You won't go that fast anywhere other then Thruxton anyway. Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted August 27, 2008 Share Posted August 27, 2008 I may be being a bit silly here, but do you really want to put a higher ratio diff on a 500+bhp Supra? I've bought a UK diff to get the lowest ratio I could find in an effort to use second and third gear more effectively. My personal feeling is that the car is now undergeared. It reminds me of having a mk2 Escort with a 2.0 engine on 1.3 running gear.. Quote Link to comment Share on other sites More sharing options...
Wez Posted August 27, 2008 Author Share Posted August 27, 2008 I am trying to get 4th and 5th down a bit, the other option is a complete new gearbox or custom ratios either of which are fapping pricey Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted August 27, 2008 Share Posted August 27, 2008 I am trying to get 4th and 5th down a bit, the other option is a complete new gearbox or custom ratios either of which are fapping pricey Yeah, I've looked that that too. IMHO the gearing on the V160 is pretty crap really. I'd rather have the NA 5sp ratios. I've often wondered if Toyota used the 6sp box as a bit of a sales gimmick. Quote Link to comment Share on other sites More sharing options...
Wez Posted August 27, 2008 Author Share Posted August 27, 2008 On most circuits you really only need 3rd to 5th with the stock setup, on some very tight corners you may drop to 2nd but once rolling 1st and 2nd are pretty redundant IMO. Quote Link to comment Share on other sites More sharing options...
Paul Whiffin Posted August 27, 2008 Share Posted August 27, 2008 http://www.mkivsupra.net/vbb/showthread.php?t=143043&highlight=diff+ratio The diff I had is sold (to Paul Whiffin, not sure if he used it or not). Yep, we used it on Ben Weeks Time Attack Supra, according to Ben its much much urgent now and makes better use of the gears. For instance at Time Attack at Brands Hatch a few weeks ago I didn't get into 5th at all when Ben was well into 5th. Not sure of the benefits on a road only car though. Ta Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 27, 2008 Share Posted August 27, 2008 O/D is a fuel saving ratio, a direct 1:00 to 1:00 top is more appropriate ratio for a track car, with a low final drive gearing. Quote Link to comment Share on other sites More sharing options...
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