James Posted April 2, 2005 Posted April 2, 2005 Soooooo Ive got this LSD fitted and the car is now driving some sence, ie the back isnt constantly trying to overtake the front!! The MOT is due at the end on April and im sure I heard somewhere that you cant put a car with a lsd on the brake rollers is this true and why? Quote
Darren B Posted April 2, 2005 Posted April 2, 2005 Hi James, I Have an LSD on my V8 and there was no problems with it when they did all the SVA stuff. I'm sure that as long as the brake rollers do both rear wheels then there isn't an issue. If they only do one wheel then I think that you either cook the oil in the diff or it leaps off the rollers when the non-rollered wheel tries to drive the car. Darren Quote
ChrisG Posted April 2, 2005 Posted April 2, 2005 Tell the MOT station you have an LSD and they should then take it out on the road for a brake test on the road using an accelerometer as even if the diff is actually OK on the rollers, the individual wheel readings they get will be all to pot. The road test is probably an easier test to pass than individual wheels and they dont tend to need too much persuading to do it with something like a Westy Quote
James Posted April 2, 2005 Author Posted April 2, 2005 Thanks darren and Chris Ill let them know and hopefully they wont pop it on, after just finishing it I dont want to damage it!! Cheers James Quote
timd Posted April 2, 2005 Posted April 2, 2005 The car will be fine in the rollers. As is every other production road car fitted with an LSD. (you don't see beemers, MX5s, S2000s, TVRs, etc etc piled up outside MOT stations with broken diffs, fr'instance...) The speed differential is less than you'd see in ordinary road driving. HTH. Quote
ChrisG Posted April 2, 2005 Posted April 2, 2005 Just point em towards their MOT manual if they are a bit numptie, it does say here that they shouldnt be tested on the rollers although I agree with Tim, it wouldnt damage anything. Quote
pete g Posted April 2, 2005 Posted April 2, 2005 never had a problem in 8 years with lsd on mot Quote
Thrustyjust Posted April 2, 2005 Posted April 2, 2005 mine done yesterday with rollers,seem to balance the braking effort from one rear wheel to the other. Quote
ChrisG Posted April 2, 2005 Posted April 2, 2005 mine done yesterday with rollers,seem to balance the braking effort from one rear wheel to the other. ...which is why I imagine they arent meant to use the rollers - cos its meant to be tested as an independent reading from each wheel ISTR, nothing to do with knackering the diff. Quote
Thrustyjust Posted April 2, 2005 Posted April 2, 2005 mine done yesterday with rollers,seem to balance the braking effort from one rear wheel to the other. ...which is why I imagine they arent meant to use the rollers - cos its meant to be tested as an independent reading from each wheel ISTR, nothing to do with knacering the diff. Exactly,no brake imbalance there then........ Quote
James Posted April 4, 2005 Author Posted April 4, 2005 Thanks guy's for the info, as I have alway's had a bit of a problem at mot's with the handbrake (Drum brakes! I think I may opt for the "Yes you may take it for a drive route" as im guessing that it would be harder for a person to say how effeicently the handbrake is working, as long as it does reasonably well I would have thought it would be adequate. Best get on and book it!! Cheers James Quote
adhawkins Posted April 4, 2005 Posted April 4, 2005 im guessing that it would be harder for a person to say how effeicently the handbrake is working It's not a question of someone deciding for themselves that it's working properly. They take a little device with them that measures (relatively inaccurately I suspect) just how much retardation the brakes are giving when they're applied. Oh, and on the MOT test that I had done this way, I drove the car for the test. Andy Quote
Blatman Posted April 4, 2005 Posted April 4, 2005 James has an ATB. They behave like an open diff when a wheel is lifted. I suspect the diff will behave like that when one roller is stopped and the other keeps going, IE the wheel that isn't moving has no torque applied to it that needs to be biased, so the diff probably won't lock... Having said that, tell 'em it's got an LSD and take it for the on the road brake test. *Much* better... Quote
James Posted April 4, 2005 Author Posted April 4, 2005 Thanks Andy and Blatters I think I will opt for the road test, By the way Blatters we have now lost all the snap oversteer since fitting new springs and front shocks the car is now very well behaved and predictable, the ATB is im sure providing alot more traction as the car seems more stable out of bends and roundabouts, so thanks for the advise you were right its lovely!! Quote
Blatman Posted April 4, 2005 Posted April 4, 2005 Not just my advice. I think most of us chipped in with something. Glad you got it sorted though. I love it when a plan comes together... Quote
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