Arran Posted May 23, 2013 Share Posted May 23, 2013 Evening all Basically I'm going to be travelling through various different countries in Europe next month and am thinking of putting my cats back in, incase we get pulled over. Question is mine is mapped for decats so if I was to put them back on without readjusting the map how will the car run, maybe over fuel or run lean? Anybody know Cheers Arran Quote Link to comment Share on other sites More sharing options...
Sam Mcgoo Posted May 23, 2013 Share Posted May 23, 2013 Not a mapper, but I'm pretty sure if anything it'll run a little rich, which is safer than lean. I'm sure someone in the know will come along soon. Quote Link to comment Share on other sites More sharing options...
KyleR Posted May 23, 2013 Share Posted May 23, 2013 It'll be fine, how many thousands of people fit decats without re mapping. No different going the other way, it'll live. Quote Link to comment Share on other sites More sharing options...
Arran Posted May 23, 2013 Author Share Posted May 23, 2013 Thinking I might just run the decats anyway, just wondering what would happen if we get stopped aboard though Quote Link to comment Share on other sites More sharing options...
Vlad Posted May 23, 2013 Share Posted May 23, 2013 Don't think anything will happen as your car registered in UK and its only should meet UK standards(MOT)...if you were going to live abroad then may be yes, but just travelling I don't see any problems! I'm pretty sure, but might be wrong! Quote Link to comment Share on other sites More sharing options...
Vlad Posted May 23, 2013 Share Posted May 23, 2013 (edited) Double post Edited May 23, 2013 by Vlad Quote Link to comment Share on other sites More sharing options...
Vlad Posted May 23, 2013 Share Posted May 23, 2013 And if u drive sensibly you won't get pulled over anyway...few years back we went for a road trip holiday thru Europe for 2 weeks - never got pulled over! Quote Link to comment Share on other sites More sharing options...
Arran Posted May 24, 2013 Author Share Posted May 24, 2013 Still have to meet EU emissions i believe fella, thinking of taking my decats with me, trolley jack and tools and swapping them over when we get to stelvio pass and nurburgring Quote Link to comment Share on other sites More sharing options...
KyleR Posted May 24, 2013 Share Posted May 24, 2013 What's the difference here, still have to have cats fitted in the UK to meet regulations. Quote Link to comment Share on other sites More sharing options...
rtbiscuit Posted May 24, 2013 Share Posted May 24, 2013 Don't think anything will happen as your car registered in UK and its only should meet UK standards(MOT)...if you were going to live abroad then may be yes, but just travelling I don't see any problems! I'm pretty sure, but might be wrong! and UK MOT regs say if the car came fitted with cats from the factory it still needs to have them. fine to swap to race cats etc, but decats are no longer road legal. the old test used to just have to pass on emmissions, so some test centres used to stick the probe in a car sat next to a vehicle with decats. and use that reading. but now its a visual inspection as well as emmissions. not only that if your found to have decats they ask to see your MOT and trace the test centre as well. they are cracking down on it alot more. and if your loud you'll draw attention to it. Quote Link to comment Share on other sites More sharing options...
Vlad Posted May 24, 2013 Share Posted May 24, 2013 Yea, I know that it is requirement in UK to have cats...I meant if he already has MOT certificate he would've been fine, as he can just wave mot paper in front of them lol ...but I did say I might be wrong, as after reading above I now know they can to check it visually! I got pulled over couple of times since I had decats, and police officer always mentioned that car is a bit loud and I always reply "well, it passed MOT so it's fine" and they agree! Quote Link to comment Share on other sites More sharing options...
jjt Posted May 24, 2013 Share Posted May 24, 2013 OP, if it means anything, my car was mapped with silenced decats on; I have now had the OEM cats and the car runs and pulls great Quote Link to comment Share on other sites More sharing options...
Suits Posted May 24, 2013 Share Posted May 24, 2013 Having the car mapped to run with out CATS will make use of the extra flow you get from the free flowing exhaust. Thus, getting the exhuast gases out quicker. If you can get the gases out quicker, you can more fule/air in quicker and make more power. Very basic way of describing it. So, your map currently allows for a more freer flowing system, so it add's more fuel to the mix, increases the fueling. Putting the CATS back in will reduce the flow, not by a great deal mind you and will reduce the power made at the higher end by a touch. As someone else said, you will just run a little rich, which is much better than lean, so you have nothing to worry about really it just wont be making ideal power for teh mods you have mapped your engine too. Quote Link to comment Share on other sites More sharing options...
Arran Posted May 24, 2013 Author Share Posted May 24, 2013 Thats cool then, as long as its not detrimental to the cars health then for a week it will be fine. Contemplating just taking the cats with me and if i need to swap them over when im out there then i will Quote Link to comment Share on other sites More sharing options...
The Chubby Ninja Posted May 24, 2013 Share Posted May 24, 2013 whatever you do to the car after an MOT is your call. the garage will just say the cats were on when it was tested. The only way they could do the garage would be to catch them in the act 1 Quote Link to comment Share on other sites More sharing options...
The Chubby Ninja Posted May 24, 2013 Share Posted May 24, 2013 Also Arran my evo was mapped with a decat and I fitted a cat on it for its MOT and it ran like it was being strangled and had a good bit less power or at least it felt that way. Im not sure if turbo cars are different though Quote Link to comment Share on other sites More sharing options...
Suits Posted May 24, 2013 Share Posted May 24, 2013 Im not sure if turbo cars are different though Hell yeah, turbo cars will feel it a lot more. The turbo will be set up to run on a less restrictive exhaust system without CATs, so the turbo will spool a different way, normally quicker, putting CATs back in will change the way the gases exit and therefor the way the turbo spools. The fueling will still be set to max but it won't be building up the PSI it's expecting so it will run worse. Again that's a very general way of describing it and there are different turbo systems but that is the basic idea. NA won't feel the drop in power as much . Quote Link to comment Share on other sites More sharing options...
The Chubby Ninja Posted May 24, 2013 Share Posted May 24, 2013 that's a fair point suits, like you said the ecu is expecting lots of air forced in by the turbo so gives loads of fuel so would run really rich until the turbo hits full boost Quote Link to comment Share on other sites More sharing options...
Suits Posted May 24, 2013 Share Posted May 24, 2013 that's a fair point suits, like you said the ecu is expecting lots of air forced in by the turbo so gives loads of fuel so would run really rich until the turbo hits full boost Yeah, I'm pretty sure that's the basic idea of Turbo's Chubb, I've got more first hand experience with NA engines though . Quote Link to comment Share on other sites More sharing options...
Vlad Posted May 24, 2013 Share Posted May 24, 2013 "Chubb" :lol: Quote Link to comment Share on other sites More sharing options...
The Chubby Ninja Posted May 24, 2013 Share Posted May 24, 2013 I prefer plump 1 Quote Link to comment Share on other sites More sharing options...
Vlad Posted May 24, 2013 Share Posted May 24, 2013 I just love word "Chubb" or "chubbz" ...don't know why...always make me giggle lol Quote Link to comment Share on other sites More sharing options...
Mark@Abbey m/s Posted May 24, 2013 Share Posted May 24, 2013 (edited) A car with the cats removed will have more ignition added if the car has been mapped, refitting the cats will cause a restriction so it is possible young start to see detonation as the restriction will cause back pressure so slowing the flame path. Going the other way is never an issue with ignition timing will normally cause a motor to run leaner but as these cars are NA they are normally pushed towards the leaner area without being dangerous. Edited May 24, 2013 by Mark@Abbey m/s 1 Quote Link to comment Share on other sites More sharing options...
Arran Posted May 24, 2013 Author Share Posted May 24, 2013 You reckon il be alright for a week mark? If I choose to switch them over beforehand Quote Link to comment Share on other sites More sharing options...
Mark@Abbey m/s Posted May 25, 2013 Share Posted May 25, 2013 we added timing to your map when you went De-catted. Balls in your court I am afraid . If you drop down I will flash a map across with the added timing removed P.S magazine article wont be happening it seems ;-( Quote Link to comment Share on other sites More sharing options...
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