MOT and full time 4wd
20 September 2007, 09:04 PM
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MOT and full time 4wd
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?
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?
20 September 2007, 09:32 PM
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I think they have a set up for 4wd too guess they would have to
21 September 2007, 12:01 AM
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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
Do they check emmissions here ?? - I've got no CAT's
21 September 2007, 12:11 AM
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21 September 2007, 01:06 AM
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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 !!!
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 !!!
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21 September 2007, 01:14 AM
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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 !!!
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 !!!
21 September 2007, 10:45 PM
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nope... not aware of any probs with the car it runs sweet
I was told that it would not pass due to the missing cats. They are what bring the emmisons down. Hopefully you're right.
I was told that it would not pass due to the missing cats. They are what bring the emmisons down. Hopefully you're right.
22 September 2007, 10:58 AM
#14
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
Not sure how this protects the transmission, but thats what he told me....
TT
22 September 2007, 03:39 PM
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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.
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.
16 October 2007, 08:13 PM
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