Just passed MOT - emissions question
Discussion
After a month off the road waiting for a windscreen It's just passed it's MOT with no problems reported. I'm looking at the CO readings which at fast idle (2450 - 3050) have a maximum limit 0.30% vol, it tested at 0.10%, obviously I'm pleased it's under but hearing the usual horror stories I wasn't expecting it to be that far under.
So in lay man's terms what does that actually indicate, would you expect a 4.5 making good power to give these sorts of readings or would you expect it to be close to the limit or even above?
Confused but happy.
David
So in lay man's terms what does that actually indicate, would you expect a 4.5 making good power to give these sorts of readings or would you expect it to be close to the limit or even above?
Confused but happy.
David
Julian64 said:
Now, I would really like to know about the MOT friendly map in the emerald. Don't want to hyjack a thread but knowing what the difference Jools managed in your emissions between peak performance and mot friendly at the 2000 rpm hold test would really interest me.
Blimey a modern version of turning the mix screw.
How very 21st Century...
Julian64 said:
Now, I would really like to know about the MOT friendly map in the emerald. Don't want to hyjack a thread but knowing what the difference Jools managed in your emissions between peak performance and mot friendly at the 2000 rpm hold test would really interest me.
Just buy an emerald then? It'll also help you scare those pesky M5's you keep worrying about.
MOT friendly map, that's a cunning bit o' kit. So what effect does this have on the performance?
Injectors are fine BTW, checked 'em when fitting the starter motor - nice and squirty but I think you might have just have been kidding
Skunkwerks - snap.
David
>> Edited by davidn on Tuesday 2nd May 17:16
Injectors are fine BTW, checked 'em when fitting the starter motor - nice and squirty but I think you might have just have been kidding
Skunkwerks - snap.
David
>> Edited by davidn on Tuesday 2nd May 17:16
When she was on the rolls I was only intested in getting a map which would help me get through the MOT. We didn't do a power run but it feels a little bit down on the 407bhp I had previously, most of that is maybe down to the CATs. The biggest difference is the part throttle which is a like a normal Cerb i.e. stuttery, the smooth response vanishes with this map but the car has a pukka MOT. I thinks it's another big plus for the Emerald, now I can get an MOT without worrying and easily return the car to it's true potential.
Ceejay
Ceejay
BCA said:
Now, I would really like to know about the MOT friendly map in the emerald. Don't want to hyjack a thread but knowing what the difference Jools managed in your emissions between peak performance and mot friendly at the 2000 rpm hold test would really interest me.
Just buy an emerald then? It'll also help you scare those pesky M5's you keep worrying about.
Good answer or if you really want to thrash an M5 then go for this - http://trackcarsolutions.net/shop/indgazzab said:
what is a under chassis closing plate?
It replaces the original chassis closing plate that fits onto the chassis and covers the centre pipes of the exhaust system, it reduces flexing, the old ones start to rust and look the worst for wear, the new one is less than half the weight and stronger whilst being just as thick, all of which make it a benefit to the car and driving.
Jules.
>> Edited by Cyclone1 on Tuesday 2nd May 17:48
Cyclone1 said:
Now, I would really like to know about the MOT friendly map in the emerald. Don't want to hyjack a thread but knowing what the difference Jools managed in your emissions between peak performance and mot friendly at the 2000 rpm hold test would really interest me.
Just buy an emerald then? It'll also help you scare those pesky M5's you keep worrying about.
I'm goona sound a bit old here, but here goes. I don't do dragstrips, and I doubt an extra 20bhp is gonna beat me round a track. If you did beat me I would be adjusting my nitrons not improving my engine first.
The Cerb I currently have is (obviously strangely) silky smooth at lower rev range, and I doubt the emerald would improve on this. I worry that just the opposite (WITH MY CAR) that an emerald would make it less driveable for 99% of the driving I do. My car NEVER stutters or has uneven power for most of its rev range, and for that even if it is down on power I like it round a track and even better for road driving. I hate a peaky car.
It would be nice to have the top end bragging figures, but I don't flatter myself that it'd make nearly as much difference round a track as me tweaking my nitrons, or learning the track a bit better by spending a bit more on track days.
Coupled with the obvious slight doubts about stressing the AJP8 more than it is already.
The only upgrades I have paid for so far is a set of linked decats to preserve my normal cats for MOT's and of course a slightly better four pot sound. 18" spiders to improve the look of the car, and nitrons because the car was bloody dangerous even with its normal power with the standard setup.
So you can see a pattern emerging here. The car/me isn't much interested in the peak BHP figure. Its interested in improving the whole package.
However I hate being at the mercy of the MOT guy each year and if the emerald allowed me to walk into an MOT with some confidence sporting a five year old CAT then change the map easily once the MOT had finished I would BUY one.
I reiterate that on testing the number of Cerbs that come to my house to use my ramp, I have NEVER had one pass my gunson emissions tester which seems to be quite accurate when callibrated to recent MOT emissions.
After all this time on the forum I trust trackcar to give me the plain truth regarding the emerald even if he is selling them, and therefore I asked
Hi Julian,
Like you I changed the suspension to Nitron first, that was nearly 3 years ago and they have been improved in spec a couple of times since then to improve the handling of the car and suit my driving style better. Next up was an AP grooved brake upgrade on the front, I still run standard rear pads cos I can't stand the screeching of the track day pads. Then onto the engine upgrades to improve smoothness, power delivery and of course bhp / torque. Every step has given a good improvement in performance on and off track. In it's current form I'm happy but I have always been a little worried about emissions at MOT time. I asked Joo to see what he could do with the car while we were fixing an alternator problem as the MOT was looming. About an hour of RR time and Joo had a map which was as friendly as he could get it, no guarantee of a pass though.
I took the Cerb to a local large chain service / MOT station with all of the latest computerised gear, explained how you got in, start the car and switchgear etc (they hadn't seen a Cerb before)and left them to it. An hour later and one MOT certificate. I think the key thing is that the tester gets the cats nice and hot before doing the emissions test, but having said that it passed with flying colours. So with two emerald maps and a good pair of cats I can enjoy the car as it should be and no longer worry about the government trying to force me into a water vapour depositing or electrical whirring eurobox.
Ceejay
Like you I changed the suspension to Nitron first, that was nearly 3 years ago and they have been improved in spec a couple of times since then to improve the handling of the car and suit my driving style better. Next up was an AP grooved brake upgrade on the front, I still run standard rear pads cos I can't stand the screeching of the track day pads. Then onto the engine upgrades to improve smoothness, power delivery and of course bhp / torque. Every step has given a good improvement in performance on and off track. In it's current form I'm happy but I have always been a little worried about emissions at MOT time. I asked Joo to see what he could do with the car while we were fixing an alternator problem as the MOT was looming. About an hour of RR time and Joo had a map which was as friendly as he could get it, no guarantee of a pass though.
I took the Cerb to a local large chain service / MOT station with all of the latest computerised gear, explained how you got in, start the car and switchgear etc (they hadn't seen a Cerb before)and left them to it. An hour later and one MOT certificate. I think the key thing is that the tester gets the cats nice and hot before doing the emissions test, but having said that it passed with flying colours. So with two emerald maps and a good pair of cats I can enjoy the car as it should be and no longer worry about the government trying to force me into a water vapour depositing or electrical whirring eurobox.
Ceejay
I understand your reasoning with regards to your Cerb, it must be pretty special if it is as smooth as you say it is and that it maintains that smoothness without too much adjustment.
The Emerald or any remap isn't all about "peak" power, it is about improving power and torque throughout the whole range and ensuring that fueling and driveability are spot on, this would surely help improve your times around the track.
The other bonus with the Emerald is that you can have various maps available, which can be a bonus especially when it comes to MOT time
The package I highlighted may not be what you are looking for, but it simply shows by adding improvements to the Cerb you can release the performance levels that the Cerb should always have had, I am sure that quite a few people will be interested in the options that are available on Track Car Solutions Website.
Jules.
The Emerald or any remap isn't all about "peak" power, it is about improving power and torque throughout the whole range and ensuring that fueling and driveability are spot on, this would surely help improve your times around the track.
The other bonus with the Emerald is that you can have various maps available, which can be a bonus especially when it comes to MOT time
The package I highlighted may not be what you are looking for, but it simply shows by adding improvements to the Cerb you can release the performance levels that the Cerb should always have had, I am sure that quite a few people will be interested in the options that are available on Track Car Solutions Website.
Jules.
Yep, I am interested in the trackcar website solutions, just not quite for the same reasons. Will only slightly be buying it for the power upgrade , as my smoothness and driveability has always been pretty good.
I see being MOT independant as a big plus.
But this conversation isn't new. When the emeralds first came out I posed this question then but the answer was a bit luke warm. I assumed this was jules intimating that the MOT couldn't really be fooled by mixture adjustment and that the frequent purchase of cats was just par for the course with Cerbs.
As I already has a smooth car there wasn't really much point to me getting an emerald in that case.
Maybe the inlet pipes have changed that nowadays, but really not sure about jumping forward into the unknown when the car I have is really pretty damn good. Maybe I should drive one of your cars at some point and realise what I'm missing
, as my smoothness and driveability has always been pretty good. I see being MOT independant as a big plus.
But this conversation isn't new. When the emeralds first came out I posed this question then but the answer was a bit luke warm. I assumed this was jules intimating that the MOT couldn't really be fooled by mixture adjustment and that the frequent purchase of cats was just par for the course with Cerbs.
As I already has a smooth car there wasn't really much point to me getting an emerald in that case.
Maybe the inlet pipes have changed that nowadays, but really not sure about jumping forward into the unknown when the car I have is really pretty damn good. Maybe I should drive one of your cars at some point and realise what I'm missing
I took my Cerb to a dealer for an MOT which was actually carried out by a third party as the dealer isn't an MOT testing station.
The car initially failed on emissions but they tweaked the map to get it through - the first Emerald they had done. The changes they made didn't make very much difference to the driving feel, though starting was a little worse. Obviously they had also replaced (and not removed) the cats so things were altered somewhat anyway.
I took the car to Jools and had the cats removed and the map readjusted shortly afterwards. If an Emerald virgin can tweak the map without too much trouble to pass the MOT then I guess the two map solution should be attainable.
The car initially failed on emissions but they tweaked the map to get it through - the first Emerald they had done. The changes they made didn't make very much difference to the driving feel, though starting was a little worse. Obviously they had also replaced (and not removed) the cats so things were altered somewhat anyway.
I took the car to Jools and had the cats removed and the map readjusted shortly afterwards. If an Emerald virgin can tweak the map without too much trouble to pass the MOT then I guess the two map solution should be attainable.
Mine had its first mot yesterday, totaly convinced it was going to fail. Got a call from the garage to say it flew through, no problems and the emissions were no different to what they would expect for any three year old car. Mind you, the cats have only done 2.5k wich may have somthing to do with it.
Julian64 said:
What would be really nice is to have someone say that who lives a little nearer than west wales
Have gunson tester, will travel to see a car with good emissions to be proved wrong, but not quite that far
Well actually, the car will be in Woking with me for a few weeks from saturday, so knock youself out. I will be itching to get the cats back off though!
>> Edited by nsparey on Thursday 4th May 11:10
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