might need a cat (mot failure)

[Mark C]

Well my rex (fd) failed the mot on emissions today and as it has a decat pipe on it i may be looking at fitting a cat, i decatted as it's a 92 and due to the fact the old cat was fubar. They didn't have time to look into it so i maybe jumping the gun a bit and it might be fixable someother way (removing the pfc putting the old ecu back on temporarily maybe?) or am i looking at getting it set up on a rolling road, again.

Question is if i DO need to get a cat where would be the best place to get one from? preferably 2nd hand and as cheap as possible as long as it works.


TIA

Mark

[adib]

couple of theads down stuff for sale

[Mark C]

Ah cheers mate, i never even thought to look there.:Hammer

[robedwards99]

Well my rex (fd) failed the mot on emissions today and as it has a decat pipe on it i may be looking at fitting a cat, i decatted as it's a 92 and due to the fact the old cat was fubar. They didn't have time to look into it so i maybe jumping the gun a bit and it might be fixable someother way (removing the pfc putting the old ecu back on temporarily maybe?) or am i looking at getting it set up on a rolling road, again.

Question is if i DO need to get a cat where would be the best place to get one from? preferably 2nd hand and as cheap as possible as long as it works.


TIA

Mark

Not positive on this but I don't think a '92 car gets tested for emmisions in the same way... possibly not tested at all due to the age of it.

Someone will be around soon who should be able to give you the facts.

[Jit]

i will have a spare cat very soon....

[Mark C]

Apparently cars registered after August 92 need a cat and sods law mine was registered in December 92 so technically it does, just my luck.

[checkpoint-direct.co.uk]

dont know how it works but my car is a 94 and it sailed through with no cats and a re amemiya ecu! mot guy sais there are different rules for rotary engined cars and they dont have the same restraints on emissions as the piston cars maybe look into garages that are aware of this. Mine passed even with the new computerised mot.

[rx7veilside]

after 92 uk car requires cat and full test
up to 95 import requires basic 3.5% co test and no fast idle test
after 95 all cars imported require cat and full test

[NurburgRob]

Simply a case of going to the wrong place!! :)

Where in the country are you matey?

[Mark C]

Yeah he said if it can be got down to under 3.5% he would pass it, thing is what would cause it to be around 7% which it is now?

It was tested there last year with the same spec as it is now and it passed??

I am seriously considering buying the cat from the guy in the 2nd hand section though i am a little concerned about the "air pipe" none of the decat pipes i have seen on the net appear to have any extra connections on them so where would this connect on my car or is it just venting to atmosphere atm?? Guess i will probably have to get under there tomorrow and have a look.

[Mark C]

Simply a case of going to the wrong place!! :)

Where in the country are you matey?


Northants (as per "location" top right of my posts ;) ) where do yuo take yours?

[Jit]

oh yeah...it is definitely down to where you take it...i got an "advisory" on my integra exhaust which was decatted.....its fair to say, the figures werent exactly a flowers best friend!!

[Merbals]

Hi,

Just to let you know there is a Cat going on FleaBay ;)

[NurburgRob]

Mark C - Can't PM you so email me jones.rob@talk21.com or give us a bell 07866 263949

I'm in Milton Keynes, if I'd looked I'd have seen you were in Northants, doh!

[Mark C]

Update, got a cat fitted and it STILL fails on emmissions, fitted the stock ecu and it STILL fails emmissions so i am basically at a loss.

Any ideas or suggestions, apart from a gallon of optimax and a match??

[Red and Single]

7% ???!!??!

Thats aweful high....very rich !

Are your spark plugs all fresh??

I think you may need to take a trip to see one of the rotary specialists for a diagnosis.

[Mark C]

Plugs were changed approx 4k ago you reckon they are due for a change?

[Red and Single]

Might not hurt, also take her out for a GOOD 5 minute full throttle blast (Ahem, within speed limits obviously ;)) just before the retest and make sure everything is nice and hot....might help.

Cats dont work at low temperatures, give it a good cooking !!

[Jit]

o2 sensor knackered?

[rx7veilside]

with a cat on but no airpump it will still struggle
some of the newer metallic high flow cats are very good with one of these a pfc ecu u could lower the injection duty cycle enought for it to read below 3.5%
mine was running very rich at 7% idle
i think a lot of tuners only tune for power and dont bother with the low down idle portion of the map
u really need to put pfc ecu back on and get infor for lowering the duty cycle which will reset when u turn off and restart the car so no damage will be done

[Mark C]

Its a standard cat that has been put back on so it will have the airpump connected, at least thats how i understand it.

[rx7veilside]

standard cat with airpump and working lamda shd pass unless either lambda is shagged or cat is shagged..mot station shd be able to get lambda reading
is ur car a uk car or import

[Mark C]

Well i have been in touch with the garage and apparently the lambda sensor isn't switching, whatever that means, a new one is on order so fingers crossed that will fix it.

Its an import.

[barmar]

Have you tried cleaning the injectors, mine failed the last 2 years but passed once this is done. Also make sure you have taken the car out for a good blast before taking it for the test as this clears any build up out the system.

Barry

[TRex]

Take your car somewhere else!

I got at least 5 RX 7's MOTed in the last 2 yrs and none required an emmisions test... :Thumbs-up

[Mark C]

you must have a very forgiving mot station ;) if the lamda sensor doesn't fix it then i might have to, question is where? i have been given the name and phone number of a rex friendly place but it is in reading which is quite a trip for an mot, if anyone has the name and addy / phone number of somewhere closer to northants please let me know as i might be needing it

[michaelb]

Hi

I have a 96Bathurst imported from Japan, I am just about to decat my mid pipe, am I going to have problems passing MOT ? – you say that post 96 cars require cat ??

Regards,
Michaelb




after 92 uk car requires cat and full test
up to 95 import requires basic 3.5% co test and no fast idle test
after 95 all cars imported require cat and full test

[rx7veilside]

a 96 car will need cat and airpump and lambda unless u have a understanding with the tester
if the rest is all standard get a hi flow cat and fit a pfc ecu this will enable the alteration to fuelling but try to stick to just getting a hi flow cat

[adib]

hi mark did you get car mot im in northants wellingborough i know a fair place i go to

[ScuttleRX]

I managed to pass without a cat on a 96, this was largely due to the fact they didnt have a 96 on records so they ran it with a 95 test :) I reckon computerisation may have scuppered this for me next time, still have my cat though, although ive heard these can go bad is they sit about not being used?

Easily passed the 95, i'll have to dig the emissions slip out, sure the co test was 0.something.

[michaelb]

Hi

My MOT tester is very RX7 friendly….Surely you can “adjust” “something” on the Apexi just to pass the test….

I wonder how expensive it would be to fit the cat back just for the test…

I have heard that people “punch” thru the ct and leave the casing on so it looks like there is a cat present, does that make sense?

Regards,
Michaelb



I managed to pass without a cat on a 96, this was largely due to the fact they didnt have a 96 on records so they ran it with a 95 test :) I reckon computerisation may have scuppered this for me next time, still have my cat though, although ive heard these can go bad is they sit about not being used?

Easily passed the 95, i'll have to dig the emissions slip out, sure the co test was 0.something.

[ScuttleRX]

Shouldnt cost much I dont think, about an hours labour? could do it yourself if you had the time, although be much easier for them up on the ramp :)

Im thinking about going for the high flow cat option, just wish there werent so pricey :( would literally just be buying to pass the test, cant get better than a straight through pipe for performance :)

[michaelb]

...I think that the high flow may rob you of some hp but I could be wrong.

I do want the free flow decat with silence thou, but I also want to pass the MOT. I guess I will have to pay to fit the old cat for the tests - it maybe worth the money for that extra power and noise !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Regards,
Michaelb


Shouldnt cost much I dont think, about an hours labour? could do it yourself if you had the time, although be much easier for them up on the ramp :)

Im thinking about going for the high flow cat option, just wish there werent so pricey :( would literally just be buying to pass the test, cant get better than a straight through pipe for performance :)

[ScuttleRX]

lol, yeah the noise and power increase is worth it I reckon. High flow is bound to rob a bit, depends how much though, think i'll stick with swapping every year and deal with the hassle.

What we need is a down pipe that branches off into 2, one to a cat and one to a mid-pipe, then have them join up again at cat back with a flap or something in the downpipe to switch between the 2! :)

Think you can do a version of this already actually, but a bit more extreme, has a switchover thing in the downpipe so you can either direct it through the exhaust system or have it venting straight out like a screamer pipe (very loud). Very tempting little mod for the drag strip, ive heard they can mess up though due to the high heat.

[michaelb]

you will also have to run 2 maps on your PFC and be able to swich between them at will....VENDORS ?????????????????????????
Regards,
Michaelb


lol, yeah the noise and power increase is worth it I reckon. High flow is bound to rob a bit, depends how much though, think i'll stick with swapping every year and deal with the hassle.

What we need is a down pipe that branches off into 2, one to a cat and one to a mid-pipe, then have them join up again at cat back with a flap or something in the downpipe to switch between the 2! :)

Think you can do a version of this already actually, but a bit more extreme, has a switchover thing in the downpipe so you can either direct it through the exhaust system or have it venting straight out like a screamer pipe (very loud). Very tempting little mod for the drag strip, ive heard they can mess up though due to the high heat.

[ScuttleRX]

When FC Tune comes out, all you'd need is the box plus one of the tablet PCs (think thats what there called, sat nav sized ones, HP make a lot of them), then I think you'd be able to switch between maps, sure they mentioned writing the software for Windows CE

I dont know if Datalogit has a Windows CE version, might be able to do it on that.

[adib]

hi mark did you get car sorted

[ScuttleRX]

http://www.rx7club.com/showthread.php?t=582665

[michaelb]

interesting.....very intersting, it may not last with the heat from the RX7..

it would be nice to get our vendors opinion on the subject at hand..

Regards,
Michaelb

[RobEVo5]

Not sure if you got this sorted, but try leaning it on idle on the hand controller. Go into the map trace and see what cell its idleing in. Then go into the injector map in settings and pull back the value in that cell.

Its probably at a value of about 120 at the moment if stock injectors. If they will let you tweak whilst the probe is up its zorst then, pull this value back until all OK. If you go too far it will start to sound lumpy. Don't ask me why but RX7's do seem to like idleling richer than most cars.

Optimum (stoich) is 14.7afr. Until I plugged a wideband in I was running 11, and now running 13. tried getting 14.7 but the idle just don't like it.

Hope this helps you, if not you anyone else reading this thread at a later date.

Even with an AFR of 13 I will probably still need both cats in place though.