MOT'd my car last year with the Center CAT only refitted.

It went through but only just with 0.3% CO (Limit =<0.3%) for natural idle.

looking at the previous year when I had the Center & DP fitted for some reason the limit was =<0.5% and it measured 0.49%. So again, only just through with both cats.........

It's now that time of year and I need to decide whether to fit the Center CAT of both CATS.

If the opinion is that just the Center will be fine, I may aswell risk just fitting that. Rather then spend another hour or so under the car fitting the DP.

 

mine passed just a short time ago with the center cat it needs to be very hot for it to work if you know the tester well they will keep going untill the car passies the test took bout 10 mins to get mine up to temp @4000 rpm just got through then droped off like a stone carnt rember the co count

chris

 

just centre should just pass..

the limits were lowered last year hence the different limits.

Simon

 

i passed the emissions with no cats

 

Which model are you guys running - classic turbo? I think they have 2 Cats. The reason I ask is that I run a STi 5 and thinking of fitting a centre Cat and droping the DP Cat (some here have said that this will increase the gas flow/improve response etc) - incase this was experience?

Cheers

 

Snap,

change the downpipe and then get a uk centre with cat for mot only

Simon

 

I passed my MOT this year with only a center cat (in the boot )

Andrew...

 

my99 ppp

nearly passed with no cats

dead easy with centry cat put on.

 

Ok, i'm running a new-age WRX so i have three cats, if i remove the up-pipe and down-pipe, leaving the centre will i pass an MOT??

 

Thanks Simon - but that would need remap/Ecuteking? Have been considering that though - bit more Fun!

Cheers

Parvis

 

run with octane booster and fit a knocklink and it should be fine!

You'll get more out of it with a remap but should be safe without if you can put up with pouring octane booster in.

Simon

 

Thanks Simon - will take this on board for shopping list!

Cheers

 

no problem.

 

Both my Imprezas have passed MOTs this year with just the centre cat:
MY96 UK turbo with dnb custom mapped ScoobyECU
MY99 STi RA Limited with Bob Rawle ECUTek map

 

Re the STi - did you fit a centre Cat after the DP De-cat? I am particularly interested to find out if fitting a Centre Cat to a Classic STi (from say a classic UK Turbo type) if any significant increase in response is gained.

Thanks

 

Have tried to get my car through mot with the Cat in the Boot, but they would not pass it?!!
Last 2 years passed on just centre cat section which I leave on now, I do not really notice the loss of any power,a bit quieter on Motorways as well.
Aggs

 

Aggs,

In the Boot?!! Now, what innovative method is that?! Presume your's is a classic turbo?

 

No problem for me. MY00 and a TEK 2.5

 

Yes I told them that they could put the Cat on,so I could pass the test,which would cost me x£ for the labour,and then take it off again and put it in the boot again.
I Suggested
That if I gave them x£ in advance they could leave the cat in the boot,they could pretend they put it on and let me pass the test and we will all be happy!
They did not comply sadly.
Car is MY2000.

 

Mine passed a few weeks back without any cats

Probably down to it being warm...oh yeah & Simons mapping Cheers JGM

MAFFA

 

My MY94 recently passed it's test with no cats in place. Think it might have something to do with the fact that my nieghbour works at a test center and he took it in for it's test. Slightly off topic, but was well chuffed as it's the first car I've owned that hasn't needed a thing done to pass it's test at the same test center.

 

mine passed with center only.

emmisions were stupidly low

something like (although cant find the paperwork)

CO = 0.11%
HC = 15PPM

natural idle CO = 0.13%

that on my own mapped PFC, but running closed loop (lambda = 1.00 on test)

you're more than welcome to borrow the centre section if you dont think yours is upto it ?

cheers
Steve

 

Ended up putting both cats back on as the dwnpipe bolts cracked loose easy enough.
Got MOT today, fast Idle 0.00%, natural idle 0.24%

 

cool bit of hassle, but it passed

bit less hassle than mine today, which wouldn't have passed the emmisions test becasue the engine didnt work !

1 new fuel pump please

its good to have friends who are willing to get you out of a fix

thanks go out to NathanL & Buzz for sorting me a pump to get me home and a new one (in that order) & Mike of Rivvett autos for the 'yeah, it'll be the pump' comments

Steve

 

Steve,

Yeah sorry I happened to travel by motorcycle today so my spare pump was in the car sat at home..

Glad you got it sorted though

Simon

 

just gota take it all apart now and solder /heatshrink the new connector on now, and i'll be in with the new pump

 

excellent..