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100 CELL CAT

S

SECTOR

PCGB Member
Member
I have recently had a Dansk 100 cell exhaust fitted. I was planning on having the car remapped to suit the exhaust by the likes of Chip Wizards / Wayne Schofield, but have not got around to it as yet. I have just had the mot carried out at a Porsche centre and it has failed due to emmision on the 2nd high speed run. Is this due to the fact I have not had the mapping done ? Any thoughts please.
I have noticed that the average fuel consumption has gone from 22mpg to 17mpg during normal driving / knocking about.
Thank all.
 
The 100 cell cats will mean that the emissions are higher as there are effectively less catalyst for the exhaust gases to pass through. Remap won't improve this I'm afraid. How far over was it? If it was marginal then a run to get the car really hot on the way to the mot might just bring it in. Cheers Graeme
 
Had a similar experience moving to 200cel cats. These engines are now getting on a bit it in age and mileage so are going to be producing more emissions anyway, this combined with your new cat being only a quarter of the number of cels compared to standard is going to be problematic. A remap could be used to lean off the emissions at the tested revs but that is not exactly a longterm solution. Something that helped emissions on mine was having a Terraclean, it might just tip the balance if your fail was marginal: http://www.porscheclubgbforum.com/tm.asp?m=797948
 
The results are as follows: Fast idle test CO 0.72 FAIL HC 9 PASS 1.120 FAIL Second idle test CO 0.01 PASS HC 0 PASS 1.10 FAIL Natural idle test CO 0.01 PASS is that bad ? Thanks all
 
So the emissions are okay (looks like it wasn't hot enough first time round) but the lamda is outside the parameters (0.95 to 1.05 I think). I would think a re-map would sort it out but phone Chip wizards and ask them.
 
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