barneybrendan Posted May 18, 2011 Share Posted May 18, 2011 Ive been searching for days now to see if anybody has actually explained in detail why the w58 is so weak.Has anybody come across a right up or could explain why. Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted May 18, 2011 Share Posted May 18, 2011 speak to pedrosixfour Quote Link to comment Share on other sites More sharing options...
Guest West. Posted May 18, 2011 Share Posted May 18, 2011 (edited) W58 gearbox with TT or single Turbo will be weak and can't handle upto 350bhp., I only understand w58 is so weak because of NA. R154 is more stronger than W58. Getrag is the best ever build and automatic is very reliable.. Edited May 18, 2011 by West. (see edit history) Quote Link to comment Share on other sites More sharing options...
Nicolai Posted May 18, 2011 Share Posted May 18, 2011 W58 gearbox with TT or single Turbo will be weak and can't handle upto 350bhp., I only understand w58 is so weak because of NA. Getrag is the best ever build and automatic is very reliable.. But why? Quote Link to comment Share on other sites More sharing options...
The Raven Posted May 18, 2011 Share Posted May 18, 2011 Is it weak? They are known to handle TT power and BPU. Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted May 18, 2011 Author Share Posted May 18, 2011 Ok what actually breaks in them looks like its the splines that wear away around the snap ring . Quote Link to comment Share on other sites More sharing options...
little num Posted May 18, 2011 Share Posted May 18, 2011 I have no idea how people break them, im running close to 400hp with mine and have done so for 12months, ive dont trackdays - driftdays and just messing around doing burnouts and stuff. Ive even welded the clutch plate to the flywheel and still the gearbox is working perfect. I have the car fully stripped out so can hear all unwanted noise's and the gearbox note hasent changed from the day it was bolted to N/A. If i do actually or when i actually break it, i will have it taken apart and rebuilt so might have an answer for you then lol. Quote Link to comment Share on other sites More sharing options...
Guigsy Posted May 18, 2011 Share Posted May 18, 2011 Isn't it usually because they are in na-tt and if you don't change the dif then in 1st it just wheelspin and in 2nd it hooks up and then fails somewhere. They always seem to fail in 2nd. Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted May 18, 2011 Author Share Posted May 18, 2011 thats what i was thinking of getting one and pull it apart.Just read one of pedrosixfour posts seems he might have found a bit of a flaw in the design.Would be nice to be able to make the w58 handle a good amaount of torque as im producing a fair bit in low rpm Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted May 18, 2011 Share Posted May 18, 2011 Isn't it usually because they are in na-tt and if you don't change the dif then in 1st it just wheelspin and in 2nd it hooks up and then fails somewhere. They always seem to fail in 2nd. id go with that , iused to go through 58s on my na-t (400ish) allways the barings in the center plate. but since fitting the tt auto lsd , long gears but the box is still silent a year on Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted May 18, 2011 Author Share Posted May 18, 2011 id go with that , iused to go through 58s on my na-t (400ish) allways the barings in the center plate. but since fitting the tt auto lsd , long gears but the box is still silent a year on are you able to stay in the lower gears for longer with that diff then. Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted May 18, 2011 Share Posted May 18, 2011 yea . its roughly 1st 35-40 2nd 70-75 3rd 115-120 4th 160ish 5th 190-195 i like it with the extra torque it works real well Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted May 18, 2011 Author Share Posted May 18, 2011 yea . its roughly 1st 35-40 2nd 70-75 3rd 115-120 4th 160ish 5th 190-195 i like it with the extra torque it works real well that would be perfect for me then with all my low end grunt.what do tt auto lsd's go for Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted May 18, 2011 Share Posted May 18, 2011 it would, the only down is if you get a launch wrong it bogs down a bit . but i dont suppose that would be as much of an issue for you . Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted May 18, 2011 Author Share Posted May 18, 2011 it would, the only down is if you get a launch wrong it bogs down a bit . but i dont suppose that would be as much of an issue for you . i wouldnt imagine id get any sort of bogging . Quote Link to comment Share on other sites More sharing options...
Homer Posted May 18, 2011 Share Posted May 18, 2011 Brendan, if you need help plotting gear and final drive ratio's let me know. There's an Excel sheet created for this in the tech section. It'll give you exact speeds based on tyre size, gearbox and final diff ratio. Quote Link to comment Share on other sites More sharing options...
Homer Posted May 18, 2011 Share Posted May 18, 2011 Here you go Brendan, actual gear speeds as discussed: Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted May 18, 2011 Author Share Posted May 18, 2011 Sweet cheers for that Daryl. What would the graph look like with the standard na non lsd diff to compare the two Quote Link to comment Share on other sites More sharing options...
Noz Posted May 18, 2011 Share Posted May 18, 2011 so by using an auto lsd u change the point the gearbox is having strain put on it? how easy is it to fit a tt auto lsd, na's dont even have one do they? Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted May 18, 2011 Author Share Posted May 18, 2011 so by using an auto lsd u change the point the gearbox is having strain put on it? how easy is it to fit a tt auto lsd, na's dont even have one do they? No i wouldnt imagine any na's have a tt diff Quote Link to comment Share on other sites More sharing options...
Homer Posted May 18, 2011 Share Posted May 18, 2011 Sweet cheers for that Daryl. What would the graph look like with the standard na non lsd diff to compare the two Here you go, diff selection changed to NA. This is the same as a stock NA, but with larger than stock rear wheel Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted May 18, 2011 Author Share Posted May 18, 2011 Thanks 3rd gear will be a lot better ideal on the hunt for a tt auto lsd diff now then Quote Link to comment Share on other sites More sharing options...
jackso11 Posted May 18, 2011 Share Posted May 18, 2011 So from this are we saying that if you have a TT with lsd and fit a w58 5sp box it will be fine if you keep the original auto TT diff? Quote Link to comment Share on other sites More sharing options...
James Posted May 18, 2011 Share Posted May 18, 2011 Seems like I should be too. I'm NA-TT and all I need for BPU is a first decat. Anything to preserve the W58 is always good! Quote Link to comment Share on other sites More sharing options...
Homer Posted May 18, 2011 Share Posted May 18, 2011 So from this are we saying that if you have a TT with lsd and fit a w58 5sp box it will be fine if you keep the original auto TT diff? Sort of. Using an auto TT diff with a w58 means the in-gear speed is higher, but this is at the cost of acceleration. The rev limits don't change with the diff so it means you will essentially be slower through the gears than using the NA diff. Swings and roundabouts Under no curcumstances should you fit an auto TT diff with an NA engine, it would be unbelievably slow to accelerate! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.