Supra diff kit who from and how much
18-08-2017, 07:53 PM
#41
10K+ Poster!!
Another question: my oppliger box has unrated viscous coupling, does this mean more power goes to rear than standard? I am sure Bara quoted x newton metres uprated?
19-08-2017, 05:53 PM
#42
Too many posts.. I need a life!!
Looks good Caddyshack. Thats what Im talking about.
How much are the diff covers then? Are the new kits supplied with the covers, or the old style hanger?
How much are the diff covers then? Are the new kits supplied with the covers, or the old style hanger?
19-08-2017, 06:17 PM
#43
10K+ Poster!!
This has always been the case though. I also think you need a diff hanger.
Don't know prices
Last edited by Caddyshack; 19-08-2017 at 06:18 PM.
20-08-2017, 11:20 AM
#44
My subconscious worked out what I was thinking. It is actually not the same.
In the same scenario the 4wd car at 469 bhp has the other 159 bhp and a chunk of torque still pulling at the front for the same weight, therefore the power to weight and torque to weight of the 310 bhp at the back is significantly different. The 310 rear on the rwd car has more weight to push against (more inertia) so in theory the 310 on the 4wd car has much less work to do to propel the car so with limited grip / excess power the 2wd car is still more likely to spin initially to overcome the inertia of the more work (weight to push).
Playing devils advocate to my argument the 4wd car has less weight in terms of power to weight to push the rear tyres in to the Tarmac so could be more grip limited than the 2wd car.
Also weight transfer on the 2wd would be greater giving more grip. My head hurts now
In the same scenario the 4wd car at 469 bhp has the other 159 bhp and a chunk of torque still pulling at the front for the same weight, therefore the power to weight and torque to weight of the 310 bhp at the back is significantly different. The 310 rear on the rwd car has more weight to push against (more inertia) so in theory the 310 on the 4wd car has much less work to do to propel the car so with limited grip / excess power the 2wd car is still more likely to spin initially to overcome the inertia of the more work (weight to push).
Playing devils advocate to my argument the 4wd car has less weight in terms of power to weight to push the rear tyres in to the Tarmac so could be more grip limited than the 2wd car.
Also weight transfer on the 2wd would be greater giving more grip. My head hurts now
As the 4wd can accelerate faster than the 2wd it will have more weight transfer to the rear so the rear wheels will spin less quickly on the 4wd as on the 2wd. When accelerating there is a lot of weight off the front wheels, so the 4x4 will sooner spin a front wheel.
20-08-2017, 11:27 AM
#45
No it still has the same power ratio between front and rear, 34% to the front and 66% to the rear. This distribution depends on the epicyclic gears in the transfer box.
The uprated viscous coupling is able to send more power (compared to the standard viscous coupling) to the slower rotating propshaft when the other propshaft is turning faster due to a spinning wheel. For instance when a front wheel is spinning the centre viscous in the gearbox will send more power to the rear wheels.
20-08-2017, 11:51 AM
#46
10K+ Poster!!
I have been amazed that with the quaife front lsd and weir kitted supra diff on 6 degree beam I have found wheelspin on damp patches when accelerating hard (not meaning a launch)
20-08-2017, 05:54 PM
#47
PassionFord Post Troll
Probably due to tyre size, what size and brand are they?
21-08-2017, 09:10 AM
#48
PassionFord Post Troll
Only saying as my mate had a version 4 sti type ra and if you where doing 30 and dropped it to 2nd gear it would spin up the tyres and fish tail. That was with 300bhp and cheap tyres.
22-08-2017, 04:21 PM
#49
10K+ Poster!!
I have new Toyota proxes on the car, it doesn't help that the 205 only runs a 16 inch wheel and 195 tyres all round plus my gearbox is close ratio and the lower diff ratio too, the car is around 1000kg so not a lot pushing it in to the ground for 500ftlb of torque.
I will try some r888 type tyres but wanted to see if I could get an 8 inch wide rim to sit well on the car and take a wider tyre, if not I may gat a 205 wide on the 7 inch rims.
It doesn't wheelspin in low boost which is around 410 bhp and less torque.
I will try some r888 type tyres but wanted to see if I could get an 8 inch wide rim to sit well on the car and take a wider tyre, if not I may gat a 205 wide on the 7 inch rims.
It doesn't wheelspin in low boost which is around 410 bhp and less torque.
07-09-2017, 12:17 PM
#51
10K+ Poster!!
I wouldn't do all that and not have the 6 degree beam or do you have that already?
07-09-2017, 12:27 PM
#52
Too many posts.. I need a life!!
I would never drive around on the streets with a modified rear beam. What happens if one of your joints snap (like the rear covers due to the lack of design analysis performed) and you hit another car head on killing a small family?
I'm not saying they're not good, just not safe for road use.
I'm not saying they're not good, just not safe for road use.
Last edited by nixon_2wd; 07-09-2017 at 12:28 PM.
07-09-2017, 12:50 PM
#53
10K+ Poster!!
I would never drive around on the streets with a modified rear beam. What happens if one of your joints snap (like the rear covers due to the lack of design analysis performed) and you hit another car head on killing a small family?
I'm not saying they're not good, just not safe for road use.
I'm not saying they're not good, just not safe for road use.
Isn't that the same for anything like adjustable track control arms, suspension or any other mod that could potentially fail, or even a non factory mechanic adjusting or replacing a simple bolt? - I know I have not referred to the torque wrench settings for every bolt I have ever touched.
No rear cover has snapped when done with the billet, it is only ever the standard cover and nobody has crashed or reported any issues other than the breakage.
All this being said I doubt whatever I type is not going to change your mind or the motivation for either of our posts.
07-09-2017, 01:27 PM
#54
I'm just about to have my 7.5" beam modified to 6deg so may try a Supra bolt in kit as I'm thinking of resale with these parts now, is there more a market for sierra diff beams rather than Supra? and if that works fine for 450lbft/500BHP max that's great, the step after that will be G.box before more power.
07-09-2017, 01:43 PM
#55
Too many posts.. I need a life!!
Much point in paying mechanics to do a job when they're not torqing the bolts down correctly, huh? And people wonder why old cars sound like ratteling shit.
Most airplane crashes are duo to mechanics doing poor repairs, scrap on runways, foreign objects entering engines etc., not the manufactured components braking because of bad design.
OEM suspension components are redundant in that if a bushing fail, the bolt still captures the control arm / trailing arm.
The rose jointed setups fail completely if the rose joints snap where welded in the trailing arm.
You cannot say they are good until you've done a fatigue analysis on them.
Again, I'm not saying they are not a good mod or anything because the rear Cossie suspension geometry sucks.., im just saying they are not safe.
My car is far from standard.. Just letting people know.
Most airplane crashes are duo to mechanics doing poor repairs, scrap on runways, foreign objects entering engines etc., not the manufactured components braking because of bad design.
OEM suspension components are redundant in that if a bushing fail, the bolt still captures the control arm / trailing arm.
The rose jointed setups fail completely if the rose joints snap where welded in the trailing arm.
You cannot say they are good until you've done a fatigue analysis on them.
Again, I'm not saying they are not a good mod or anything because the rear Cossie suspension geometry sucks.., im just saying they are not safe.
My car is far from standard.. Just letting people know.
Last edited by nixon_2wd; 07-09-2017 at 01:46 PM.
07-09-2017, 04:11 PM
#56
cossie fan (unluckerly)
Too me I'm not fussed how much the supra set up costs lol the diff was cheap the fitting kit 500 odd a full refurbish at Bara with the up rate kit 600 I think?
Mt rear cover 300 I think?. It's peace of mind and it's not going to brake lol the Ford 7.5 inch c.w.p will not take torque I re built mine twice it gets boring fixing the same thing over. Plus for me a Ford 9 inch I can't justify.
As for the mk beam I've one and the quality is spot on I've absolutely zero worries about it failing on the road what a stupid thing to say lol
Mt rear cover 300 I think?. It's peace of mind and it's not going to brake lol the Ford 7.5 inch c.w.p will not take torque I re built mine twice it gets boring fixing the same thing over. Plus for me a Ford 9 inch I can't justify.
As for the mk beam I've one and the quality is spot on I've absolutely zero worries about it failing on the road what a stupid thing to say lol
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Caddyshack (07-09-2017)
