Thinking of putting a skyline box in ?
30-09-2014, 11:33 AM
#46
10K+ Poster!!
The Bara Kit linked by Jay is the std ratio kit at around Ł1500 GBP, even with 500 bhp and Torque plus the Borg twin spool there is still a gap betweed gears as the boxes are geared for over 170 mph which is not ideal for a road car to get the best out of the engine. The close ratio ones are tqice the price.....then if you are going to drop even Ł1500 you need to rebuild the box with bearings and seals etc....there is almost another Ł1500 if you use everything recommended by bara including testing on the dyno etc..
As I am putting in the 3.9 Supra diff you also need drop gears to suit but that has been allowed for in the Ł1500 extra.
The Oppliger close ratio box takes the total to Ł4300 euros including the cradle for the gear change and fully built up.
We also need to consider that you would be daft to spend over Ł3000 and not do a hydraulic clutch conversion, fit a new clutch suitable for the power and if you have done that much the flywheel probably needs replacing...another Ł1000 to Ł1500.
As Sonic Boom says, people spend Ł10k on an engine but need to consider Ł5ish for the running gear.
My Supra diff kit, second hand diff, Bara complete rebuild and setup of ramp angles etc stands me in at Ł2000 and it isnt even on the car yet!
The 3.9 ratio diff and drop gears drops the top speed by around 15% so I am just working out if I will really need the close ratio or not...I have referred this to Mark Shead as he knows my engine characteristics and the road use planned for the car...although when I have 530 bhp on the long studded block with cams and pistons plus a sorted transmission it would be a shame not to see how it performs up the strip based on sticky tyres and the lightweight Pug 205 shell.
30-09-2014, 03:03 PM
#47
PassionFord Post Troll
I have been doing a lot of research with Oppliger and Bara on this.
The Bara Kit linked by Jay is the std ratio kit at around Ł1500 GBP, even with 500 bhp and Torque plus the Borg twin spool there is still a gap betweed gears as the boxes are geared for over 170 mph which is not ideal for a road car to get the best out of the engine. The close ratio ones are tqice the price.....then if you are going to drop even Ł1500 you need to rebuild the box with bearings and seals etc....there is almost another Ł1500 if you use everything recommended by bara including testing on the dyno etc..
As I am putting in the 3.9 Supra diff you also need drop gears to suit but that has been allowed for in the Ł1500 extra.
The Oppliger close ratio box takes the total to Ł4300 euros including the cradle for the gear change and fully built up.
We also need to consider that you would be daft to spend over Ł3000 and not do a hydraulic clutch conversion, fit a new clutch suitable for the power and if you have done that much the flywheel probably needs replacing...another Ł1000 to Ł1500.
As Sonic Boom says, people spend Ł10k on an engine but need to consider Ł5ish for the running gear.
My Supra diff kit, second hand diff, Bara complete rebuild and setup of ramp angles etc stands me in at Ł2000 and it isnt even on the car yet!
The 3.9 ratio diff and drop gears drops the top speed by around 15% so I am just working out if I will really need the close ratio or not...I have referred this to Mark Shead as he knows my engine characteristics and the road use planned for the car...although when I have 530 bhp on the long studded block with cams and pistons plus a sorted transmission it would be a shame not to see how it performs up the strip based on sticky tyres and the lightweight Pug 205 shell.
The Bara Kit linked by Jay is the std ratio kit at around Ł1500 GBP, even with 500 bhp and Torque plus the Borg twin spool there is still a gap betweed gears as the boxes are geared for over 170 mph which is not ideal for a road car to get the best out of the engine. The close ratio ones are tqice the price.....then if you are going to drop even Ł1500 you need to rebuild the box with bearings and seals etc....there is almost another Ł1500 if you use everything recommended by bara including testing on the dyno etc..
As I am putting in the 3.9 Supra diff you also need drop gears to suit but that has been allowed for in the Ł1500 extra.
The Oppliger close ratio box takes the total to Ł4300 euros including the cradle for the gear change and fully built up.
We also need to consider that you would be daft to spend over Ł3000 and not do a hydraulic clutch conversion, fit a new clutch suitable for the power and if you have done that much the flywheel probably needs replacing...another Ł1000 to Ł1500.
As Sonic Boom says, people spend Ł10k on an engine but need to consider Ł5ish for the running gear.
My Supra diff kit, second hand diff, Bara complete rebuild and setup of ramp angles etc stands me in at Ł2000 and it isnt even on the car yet!
The 3.9 ratio diff and drop gears drops the top speed by around 15% so I am just working out if I will really need the close ratio or not...I have referred this to Mark Shead as he knows my engine characteristics and the road use planned for the car...although when I have 530 bhp on the long studded block with cams and pistons plus a sorted transmission it would be a shame not to see how it performs up the strip based on sticky tyres and the lightweight Pug 205 shell.
30-09-2014, 04:44 PM
#48
10K+ Poster!!
The front diff can run with the 3.9 rear supra diff when using the correct drop gears.
According to MAD and Bara the front diff is up to the job but the strengthening plate and a simple bara rebuild should do the job....I think there is a Quaife option
The 3.9 diffs can be hard to find, mark at MK did my kit and found the diff but it took a long while to find and it went straight to bara to be rebuilt.
According to MAD and Bara the front diff is up to the job but the strengthening plate and a simple bara rebuild should do the job....I think there is a Quaife option
The 3.9 diffs can be hard to find, mark at MK did my kit and found the diff but it took a long while to find and it went straight to bara to be rebuilt.
30-09-2014, 05:43 PM
#49
PassionFord Post Troll
The front diff can run with the 3.9 rear supra diff when using the correct drop gears.
According to MAD and Bara the front diff is up to the job but the strengthening plate and a simple bara rebuild should do the job....I think there is a Quaife option
The 3.9 diffs can be hard to find, mark at MK did my kit and found the diff but it took a long while to find and it went straight to bara to be rebuilt.
According to MAD and Bara the front diff is up to the job but the strengthening plate and a simple bara rebuild should do the job....I think there is a Quaife option
The 3.9 diffs can be hard to find, mark at MK did my kit and found the diff but it took a long while to find and it went straight to bara to be rebuilt.
04-10-2014, 04:15 PM
#50
We I'v made my mind up for the time being as I'v got a track day coming up on the 26th I'v put one of my spare mt75 boxes in the the car but I have started on the jig to start the skyline gear box conversion I'm going to do it 100% I'v made my mind up on this matter . I will try and get some photos up ASAP thanks very much for your inputs lads
04-10-2014, 04:29 PM
#51
We I'v made my mind up for the time being as I'v got a track day coming up on the 26th I'v put one of my spare mt75 boxes in the the car but I have started on the jig to start the skyline gear box conversion I'm going to do it 100% I'v made my mind up on this matter . I will try and get some photos up ASAP thanks very much for your inputs lads
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05-10-2014, 06:23 PM
#59
When I was in Malta 8 years ago, a guy there had done a R33 conversion on a 3 door the same way you're starting.
Not a perfect solution, but it worked at the time for him.
Not a perfect solution, but it worked at the time for him.
16-10-2014, 11:10 PM
#61
Hi lads just to let you no the Cosworth and skyline bell housings are now taked togever and are going back to the welders tomorrow to be welded up 100% if you won't to read more about how I'm doing this mod please got the rebuilds page and look for ( coleyst200 focus to focos / skyline gear box lots of photos so you can see for your self and make up your own mind . Thanks again for your inputs but I fort this post was about a skyline gear box Not a Toyota diff ???????
17-10-2014, 07:59 AM
#63
It's not the strongest, but certainly the easiest and cheapest as far as DIY goes.
As with lots of patience, it can be done DIY with no real specialist tools for the most part
As with lots of patience, it can be done DIY with no real specialist tools for the most part
17-10-2014, 08:32 AM
#64
17-10-2014, 09:34 AM
#66
10K+ Poster!!
nice write up, thanks for posting.
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