scudderfish
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| posted on 23/9/10 at 06:13 AM |
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MOT emissions test
What RPM(s) are they done at? First MOT since doing the MS conversion tomorrow, and my car is running rich. Can't go for a blast to map it
better so I thought I could at least do the bits where I'll get tested and then sort the rest once I can legally drive it.
Regards,
Dave
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speedyxjs
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| posted on 23/9/10 at 06:15 AM |
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I think its one at idle and one at fast idle but could be wrong.
How long can i resist the temptation to drop a V8 in?
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bigrich
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| posted on 23/9/10 at 07:10 AM |
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CAT test is a check at 3000rpm and at idle
NON CAT is a check just at idle
Pre august 75 (IIRC) or Q plate is just a visual check for excess smoke at idle
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A pint for the gent and a white wine/fruit based drink for the lady. Those are the rules
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adithorp
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| posted on 23/9/10 at 07:34 AM |
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Cat... idle and fast idle (2500-3000prm).
Non-Cat... idle only.
adrian
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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RazMan
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| posted on 23/9/10 at 07:58 AM |
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If you can tweak the map to burn well at 2500-3000 (not too lean or it will still let unburned fuel through) and at idle you should scrape through the
test [crosses fingers] Have you still got an AFR gauge?
[Edited on 23-9-10 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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britishtrident
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| posted on 23/9/10 at 08:12 AM |
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The fast idle test can cause problem a lot of garages do it at too high an RPM --- it should always be a bit below the max rpm the engine will run
closed loop.
A few years back a well known automotive data publisher published charts with the fast idle test RPM for the older Rover 214s given as 2,850 rpm ---
they go open loop above 2750 rpm as a result a lot of cars failled the fast idle test.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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scudderfish
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| posted on 23/9/10 at 08:17 AM |
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My engine is 1984 so it looks like just the idle test for me then 
Thanks,
Dave
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Richard Quinn
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| posted on 23/9/10 at 11:31 AM |
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quote:
Originally posted by bigrichQ plate is just a visual check for excess smoke at idle
Noooo, not always the case. Mine's on a Q but has emissions limits on the V5.
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davrus
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| posted on 23/9/10 at 12:23 PM |
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It may have limits on the v5 but mot will only be visual test as it is on a Q + you dont need your v5 for mot so tester will not know.
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Feel free to sign my guest book in the links page.
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DRC INDY 7
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| posted on 23/9/10 at 12:31 PM |
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Smoke test only on a Q
https://www.facebook.com/groups/462610273778799/
Puddle Dodgers Club
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Richard Quinn
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| posted on 23/9/10 at 02:23 PM |
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quote:
Originally posted by davrus
It may have limits on the v5 but mot will only be visual test as it is on a Q + you dont need your v5 for mot so tester will not know.
Thought that this was one of the "benefits" of the fandangled computerised MOT system. I thought it showed them all the relevant info
without the need to see a V5 etc. If it's not then I'll be made up.
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matt_gsxr
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| posted on 23/9/10 at 04:17 PM |
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I understand that you can't go for a drive to map your car, but all the emissions stuff is done with the car static.
Why not lower the values in the VE table until it is running stoic. from idle through to 2000rpm? Or don't you have an AFR.
Good luck with the test. It shouldn't be too tough on a 84 engine.
Matt
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