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View Full Version : MOT and full time 4wd OLLIeRB5 20 September 2007, 21:04 whilst taking my mates starlet sr thru mot for him tonihgt it dawned on me... how do the mot testers test the brake balance etc on cars with full time 4WD? Surely their 2wd system would damage the 4wd as all 4 wheels arent being turned at the same time? ulsterscooby 20 September 2007, 21:32 I think they have a set up for 4wd too guess they would have to OLLIeRB5 20 September 2007, 22:12 i thought that myself, just wondered if they definately did before some muppet goes and puts it on a 2wd one daddyscoob 21 September 2007, 00:01 I've wondered about this cos when I mot'd in England they didn't put AWD's on the brake tester. They drove them on the road with some sort of gizzmo on the floor of the passenger side that read brake efficincy. Do they check emmissions here ?? - I've got no CAT's :wonder: brocks 21 September 2007, 00:02 Thye have four wheel drive roller, and they DO check emissions....bit of Redex and a spirited drive to the test centre always passed no probs.... daddyscoob 21 September 2007, 00:11 Thye have four wheel drive roller, and they DO check emissions....bit of Redex and a spirited drive to the test centre always passed no probs.... cheers:thumb: ustolemyname??stevieturbo 21 September 2007, 01:06 Rollers at local MOT centres are quite safe. And if your car is older than 2001, I wouldnt worry too much about emissions as long as the car is running properly. They dont do the full emissions/CAT test on these cars. Its just the basic CO below 3.5%, and HCC below 1200ppm....and if you cant pass that, there is something seriously wrong with the car !!! daddyscoob 21 September 2007, 01:14 Rollers at local MOT centres are quite safe. And if your car is older than 2001, I wouldnt worry too much about emissions as long as the car is running properly. They dont do the full emissions/CAT test on these cars. Its just the basic CO below 3.5%, and HCC below 1200ppm....and if you cant pass that, there is something seriously wrong with the car !!! mine's an 02 wrx........... wouldn't pass back in England but I had a friendly garage ustolemyname??stevieturbo 21 September 2007, 01:27 You will have the full emissions test then. Although no real reason why it should fail ? Is something wrong with the car ? gojonnyjo 21 September 2007, 07:33 You will have the full emissions test then. Although no real reason why it should fail ? Is something wrong with the car ? have to agree here with stevie, must be summit wrong if ya cant pass the emissions test :wonder: daddyscoob 21 September 2007, 22:45 nope... not aware of any probs with the car it runs sweet:thumb: I was told that it would not pass due to the missing cats. They are what bring the emmisons down. Hopefully you're right. ustolemyname??stevieturbo 22 September 2007, 00:03 Ahhh missed you saying you had no cats... Most likely it will fail here too then. scoobynewbie72 22 September 2007, 07:42 I thought the Cat test was only a visual check that you actually had one? tarmac terror 22 September 2007, 10:58 I have always been directed into lane 4 to have the impreza tested, the tester told me the rollers in lane 4 can be set to rotate in opposite directions to test 4WD cars. Not sure how this protects the transmission, but thats what he told me.... TT ustolemyname??stevieturbo 22 September 2007, 15:39 With no cat in place, certain emissions will simply be higher than they should be...namely CO, HCC, and Nox....its the CAT's job to turn these supposedly harmful gases into carbon dioxide.....and they claim carbon dioxide causes global warming... Go figure. All the lanes are suitable for 4wd. pretty sure at no point, do any 2 wheels rotate in the same direction..so no drive will actually be applied via the 3wd system to another axle. All diffs work quite normally. Although its highly unlikely given a Subaru has viscous coupling diffs, that even if they did rotate the axle pairs at different speeds during a stationary brake test, any damage could be caused. Driving about with 2 new tyres on one axle, and 2 old tyres on the other would probably cause more strain on the centre diff, due to differing axle speeds as one set of tyres will have a larger diam than the other. big-kev 16 October 2007, 20:13 whilst taking my mates starlet sr thru mot for him tonihgt it dawned on me... how do the mot testers test the brake balance etc on cars with full time 4WD? Surely their 2wd system would damage the 4wd as all 4 wheels arent being turned at the same time? JUST HAD THE STI THRU M.O.T TONIGHT AND ASKED THE INSPECTOR ABOUT THE FOUR WHEEL DRIVE SYSTEM , HE TOLD ME WHEN THEY CHECK THE BRAKES (FRONT AND REAR ) THE CAR IS IN NEUTRAL SO THE FWD SYSTEM IS NOT ENGAGED :wonder: ustolemyname??stevieturbo 16 October 2007, 21:53 tester is obviously an idiot then. big-kev 16 October 2007, 22:35 tester is obviously an idiot then. MATE THEY ARE ALL IDIOTS :lol1: |