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M

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Discussion Starter #1
I'm wondering how much that procedure will give xtra HP:s.

Happy maydays eve,Mikko
 
W

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Discussion Starter #2
........and where can you get a de-cat pipe for a V6?

wrinx
 

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AO's shop has a de-cat exhaust for the 155.

What is the UK legal situation with a de-catted car at MOT time? :confused:
 
W

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Discussion Starter #4
Simple, it will fail!! Needs to be put back on come the dreaded day. But you get extra horses and no bill for cat replacements! Not sure if they need to be used to be efficient???

wrinx
 
J

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Discussion Starter #5
dont know how i ended up as the newest member..anyway i will check the mot testers guide about cats and let you know.
 
W

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Jimybob

I think some posts must have been lost, sure I'd got at least another 100......could be wrong tho :(
Also just spotted one user Jonny M has zero posts but you can see two under "sparkplug leads".....something wierd goin on!

wrinx

EDIT [ sussed it, Henry has slipped AO a tenner as I was about to overtake him as the highest poster] wink
 
S

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Am i right in thinking there is a cut off date after which all cars had to have CAT's to pass the MOT? however if you have a car registered before this date with a CAT fitted you can remove it and still pass the test? if so what is the date?

Stef.
 
W

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Hi Stef

You are right, any car registered previous to 1992-K (dont know if there is a specific month) can have the cat removed and pass. Cars such as Volvo and the Nissan 200sx I had, had cats fitted earlier than '92.

I presume they still have to pass some sort of emmissions test, perhaps just visual, dunno??

wrinx
 
J

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any car first used on or after 1st august 1992 must have a cat fitted although there is a transition period until 1st aug 1995 for manufactures who couldnt meet the requirement in 1992.however when you go for your mot if the tester cant find an EXACT match for your car in the emmissons catalouge then all it needs is a basic test(3.5%co)i looked today and all 155s are there but not the Q4 so if you have a Q4 you can take off the cat and get away with it(in theory)any car used before 1992 even if it does have a cat only needs to pass the basic test(3.5%co)all the 155s in the book need to be 0.5%coMAX the rules are very long winded if you want know any more let me know(or any MOT subject)
 

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HI JIMYBOB:
I PASSED THE M.O.T. IN MY COUNTRY TWO WEEKS AGO, AND WHAT SURPRISED ME WAS THAT THE CO% EMISSION IS 0,4% AND THE INSPECTOR SAID THAT IT WAS PLUS PERFECT.
ANOTHER VALUE THAT I DON´T UNDERSTAND WHAT MEANS WAS ABOUT LAMBDA AND THE GRAPHIC SAYS 1,37 ?
WHEN I ASKED HIM WHAT IS 1,37 HE ONLY ANSWERED THAT IT IS BETWEEN 1. AND 1,80 SO MY MEASURE WAS O.K.
COULD YOU EXPLAIN ME HOW THEY CAN MEASURE THIS LAMBDA VALUE FITTING A TUBE IN YOUR EXHAUST ?
ARE THESE VALUES CORRECT ? OR IT WAS BECAUSE HE WAS WAITING HIS LAUNCH HOUR ?
REGARDS
JORGE frown
 
J

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Discussion Starter #12
lambda is the air fuel mix perfect mix is 14/1 which is 14 parts air to 1 part fuel or lambda 1 the ideal reading on the machine would therefor be 1.000 lambda.its worked out from the co% and the hc% yours sounds fine if it wasnt it wouldnt have passed.!!
 
P

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Hi all i'm thinking about decatting my 95m 1.8 8v widebody i've seen a pipe on alfaownershop (supersprint) if it does seem easy to remove/refit i think i will give it a go. Could there be any lamba sensor problems attatched with this!!
cheers PHIL :rolleyes:
 
J

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Discussion Starter #14
there should be no problems with the lambda sensor it reads mixture before the cat not after.
 

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Well here is a question for you.
My car has a LPG conversion. Very cheap to run and easy to switch back to Petro, in a split second if you want to have fun and race on the road. I would love to remove my CAT for the free extra power (mmmm! power!) and the LPG has massively low emmisions, very green :)
The question is, can I take my car to the MOT station for testing whilst running on the gas - that way I should not need to put the CAT back on. Whaddayathink? There is achance that the tester wouldn`t even notice it was on gas so the other question is, is there part of the emmissions test that the gas would still fail?
 
J

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Discussion Starter #16
the manual reads as follows..exhaust emmissions testing is applied to all petrol AND gas powered vehicles with four or more wheels..blah blah blah..however if your gas powered car was first used before 1st aug 1994 then a non catalyst test is all that is needed im not yet sure how it works for duel fuel cars i will find out and let you know.
 
W

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Discussion Starter #17
Chris

The MOT inspector would probably notice the very large tank in your boot whilst checking the spare tyre......

At a guess I would say that they would have to test both the petrol and gas for emissions as you run both together. Have you not had it tested since you've had it?

Can you tell us what the difference in consumption/costs are and how does it drive on lpg?

wrinx
 

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Actually the tank in the boot is very discreet and hidden under a false shelf.

I`ve only had the gas for about 6-7 months, 3 months to go before MOT.

Cost of LPG is about half petrol but the mpg is a little lower. I am averaging 8.5p per mile which is about 20mpg. That is for all mileage but the main miles on the motorway usually cost nearer 7.5p per mile. That sounds crap but I drive with a very heavy foot and usually at about 80-90mph for most of the time. If I drive at 50-60 and gently I can get about 28mpg (this is a 2.5 V6). The best petrol consumption I ever had was 12p per mile driving very carefully at 70mph on a long run. If I drove on petrol like I do on gas I would be getting about the same 20mpg.

What I have found is I can drive with absolutely no regard for the cost of fuel and enjoy myself instead of worrying about the pennies all the time. The power is down to about 80% of petrol but it needs a tune at the moment, 90% is nearer the usual, but who cares about full power when all you are doing is cruising the motorway for hours. LPG is also not quite as smooth as gas but that all depends on the LPG brain chip mapping - I`m off to a specialist soon to get mine tuned up a little better - should get better mpg after that too.

Oh yeah, and when the pesky BMW 323s (or even the upstart 318s!!! - in your dreams matey!) want to play with you then you press the little microswitch and the petrol is back in an instant allowing you to smear them into a dot in your rear view mirror :D

OK, so bad points are: the tank, which takes up space; the cost, about £1500 - £1800 depending on how many cylinders you have. The good news is that if you do lots of miles it keeps your engine nice and clean (no carbon in the oil to send it black) and it has a very high octane rating so you have no chance of detonation, and its cheap!
 
J

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Discussion Starter #19
err actualy the mot tester is not allowed to look under the carpet the spare wheel is not part of the test.we can only test what we can see that means no lifting of carpets and no moving the trim to have look underneath.this means that in therory if the whole underside of your car was covered in by a skid tray or something similar the tester cant remove it this also means that the whole car could be rotten under the tray and it would still pass..have you ever taken off a sill trim to find its all rotten underneath?i have but if you cant see it you cant test it..!!
 
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Discussion Starter #20
Jimybob

Interesting! I was told by an MOT tester (who I no longer use) that if he thought brake pipes might be dodgy where he couldnt see then he would fail the car!!!!!!

Always thought the spare tyre was tested if it was there but it was ok to remove it (in case of baldness!)/

wrinx??
 
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