Confirm:S2 needs cat if first registered post 31/7/95

[Breed]

You must have that pre cat though its one or the other. A&M

From a legal or emmision point of view? My emmision figures are low and I cannot believe the pre cat is that efficient. Its only there to keep emmisions low on cold starts, before the main cat is warm enough to work. Before the next MOT the pre cat will be off and emmisions tested and I think it will pass the basic emmisions test which is how it has been tested by 3 different garages in 4 years. No different to SE's or earlier S2's who have removed both. Legaly not sure.

Bill

[max and andy]

I'm not sure about the pre cat all i know is ours was doing a fine job of restricting. It was clogged up and cobwebby using the Garages terms. But i still think if your tested as a post 7/95 S2, with no cats you will fail. A&M

[ektrolleyboy]

My car failed it MOT yesterday... Hmmm... Paul Matty are currently fitting the original ECM back in the car as I've been running an S.E unit with an Everest Mountain chip. Since fitting this chip/ECM I've had many pops and bangs as the fuel is clearly being sent through a bit rich. Not a problem ordinarily, but clearly a problem for MOT emissions.
Let's see what happens today, but I'm a bit scared to say the least.
I'm running a sports cat' already in my PIPER 2.25" system. And now a boggo S2 ECM. Awaiting a Paul Matty phone call with the results.

Roy did warn of a lack of a Lamda sensor on the S.E units. But ESM said the Everst Chip would bypass this problem. Perhaps this has a detrimental affect on emissions?

[max and andy]

How far over where you? Andy

[ektrolleyboy]

I did ask, but was just told "Excessive".
Paul Matty are dealing with it, so I'm somewhat devoid of knowledge.

[rip]

My car failed it MOT yesterday... Hmmm... Paul Matty are currently fitting the original ECM back in the car as I've been running an S.E unit with an Everest Mountain chip. Since fitting this chip/ECM I've had many pops and bangs as the fuel is clearly being sent through a bit rich. Not a problem ordinarily, but clearly a problem for MOT emissions.
Let's see what happens today, but I'm a bit scared to say the least.
I'm running a sports cat' already in my PIPER 2.25" system. And now a boggo S2 ECM. Awaiting a Paul Matty phone call with the results.

Roy did warn of a lack of a Lamda sensor on the S.E units. But ESM said the Everst Chip would bypass this problem. Perhaps this has a detrimental affect on emissions?

Have I read this right, you have an SE (open-loop) Everest in an S2? If so, then this will be your problem.

The S2 is closed-loop (O2/Lambda sensor next to the turbo). You can get a 1499 (S2) Everest which would use this & would not effect emissions at idle/fast idle since it only affects boost targets.
The SE works to a pre-set air-fuel ratio which is not as accurate as a reactive (closed-loop/S2) one. I believe the CO pot is missing from S2s too so there's no manual adjustment.
O2 sensors don't like sitting there idle. Once installed, they must be used or they'll go wrong.
If you do have an SE Everest, then sell it (not a problem) & buy an S2 (1499) one instead.

[ektrolleyboy]

Just to clarify.
I have a 1994 S2.
I'm running an S.E ECM with a 1499 S2 Everst chip...

Also. The pops and bangs were not present before fitting the new S.E ECM. And as soon as the original ECM was put back the car passed it emissions straight away.
The car runs fine and the S.E ECM even appears to have cured the over-boost. Don't ask me why and do say it shouldn't, because it does!

[rip]

Don't ask me why and do say it shouldn't, because it does!

[Breed]

Hi

Do all S2's have a label on the panel between the headlights under the bonnet that says the engine meets 1992 emmisions? If so does any one have any idea what it means? I do know what it says but I was thinking how it relates to date of engine manufacture and are you allowed to build a car and have it tested to emmisions standards for when the engine is built not when the car is made.


Thanks
Bill

[Marcus_uk]

Just to add to even more evidence to this thread, my 1994 S2 went through its MOT fine last week and today I've found out that the cat box is empty! (But I still have a pre-cat).

[Aoki Magic Pants]

Brilliant! I’ve just found out that my recently acquired S2 was registered on the 16/09/1994. Piper RS 2.25” & Mountain chip for me then

[rip]

Brilliant! I’ve just found out that my recently acquired S2 was registered on the 16/09/1994. Piper RS 2.25” & Mountain chip for me then

Prepare to port your wastegate too.

[Aoki Magic Pants]

Brilliant! I’ve just found out that my recently acquired S2 was registered on the 16/09/1994. Piper RS 2.25” & Mountain chip for me then

Prepare to port your wastegate too.

Will do thanks

[ratman]

Brilliant! I’ve just found out that my recently acquired S2 was registered on the 16/09/1994. Piper RS 2.25” & Mountain chip for me then

Prepare to port your wastegate too.

Will do thanks

I have an S2 with everest chip (the one for s2), pre-cat cleared out, main cat ok, stock pipes and SJ ssteel rear box.
the car is really powerful but when you are flat down the acceleration is not completely linear. It seems that the car has few "waves" (not holes, but the power is increasing with the revs but with more and less acceleration during the same stint).
could be the wastegate that is opening and closing? could be only the beginning boost creep?
thanks for your reply!

[Marcus_uk]

I have an S2 with everest chip (the one for s2), pre-cat cleared out, main cat ok, stock pipes and SJ ssteel rear box.
the car is really powerful but when you are flat down the acceleration is not completely linear. It seems that the car has few "waves" (not holes, but the power is increasing with the revs but with more and less acceleration during the same stint).
could be the wastegate that is opening and closing? could be only the beginning boost creep?
thanks for your reply!

I had the same sensation... my wastegate was slighty sticky, do the wiggle... only takes 15 mins and you get smooth (and slighlty more boring) power delivery

[JimF]

Geoff,

Old post but relevant. I had already fitted a Peco and it passed the MOT with just the precat fitted (condition unknown - didn't look). No boost creep and a small performance increase but it's too loud for DW.
I want to reduce the exhaust note so am going back to standard cat and silencer spec with some stainless bits, all from SJ. I am commited to the standard route and have the bits to fit.
One query isthat the Lotus parts manual (diagram - Elan closed Loop 4501) shows a Gas Temp sensor fitting into a pocket on the cat. The cat doesn't have such a pocket and I can't find a sensor in that area anyway. Part number quoted for the sensor is A100E6276H. I am puzzled. Can anybody steer me in the right direction?

A quick check of the database and names I know suggests that the following members should keep their cats:

ab2cv
ailwyn
Brian-Cate
CJ101KT
Farran
Gazza
JimF
junks
M100_DMM
m400kay
marcdando
Martin R
max and andy
nchase
Nige
ShaunM

[CJ101KT]

I have the 2.25" PiperRS system with the sports cat and their PCE. The car is registered as a 1995 M plate so prior to the change but I am going to get it tested before the MOT is due in the winter in case I need to make plans to visit another tester incase the local one sees the rules differently.

[GeoffSmith]

Geoff,

Old post but relevant. I had already fitted a Peco and it passed the MOT with just the precat fitted (condition unknown - didn't look). No boost creep and a small performance increase but it's too loud for DW.
I want to reduce the exhaust note so am going back to standard cat and silencer spec with some stainless bits, all from SJ. I am commited to the standard route and have the bits to fit.
One query isthat the Lotus parts manual (diagram - Elan closed Loop 4501) shows a Gas Temp sensor fitting into a pocket on the cat. The cat doesn't have such a pocket and I can't find a sensor in that area anyway. Part number quoted for the sensor is A100E6276H. I am puzzled. Can anybody steer me in the right direction?

Jim,

The exhaust gas temperature sensor is only for Japanese cars so no need for you to have one. There were a couple of dozen on the Aftersales list a few years ago for about £45 - wonder if South West Lotus have twigged yet!

Geoff

[JimF]

Geoff,

Thank you. Spannering on the exhaust can now start after I have fixed the leaks through the door mirror. I want to keep the car but DW's handbag is getting wet on thefloor and I have to deal with fallout from WMD. (Wild marital discord).

Jim


Jim,

The exhaust gas temperature sensor is only for Japanese cars so no need for you to have one. There were a couple of dozen on the Aftersales list a few years ago for about £45 - wonder if South West Lotus have twigged yet!

Geoff[/quote]

[RayD]

Passed MOT today ... CO was 0.13 ... see above.

Ray