Which Exhaust System is the Best?

[SachinBharat]

Hi Guys,
Currently have a 120i, sent it in for de-cat and the guys messed it up, now it has a empty hollow sound, any ideas to rectiy? they cleaned out the catz and put it back on.

 

[akash]

As far as i know they were supposed to remove the cats completely and put in a straight pipes, not put the cats back. Then put in cat foolers for the exhaust sensors so as to not pick up any errors. The next step would be to remap your ECU to optimize the new change to the exhaust.

 

[SachinBharat]

As far as i know they were supposed to remove the cats completely and put in a straight pipes, not put the cats back. Then put in cat foolers for the exhaust sensors so as to not pick up any errors. The next step would be to remap your ECU to optimize the new change to the exhaust.

have you seen where the catz reside on the 1 series? its on the downpipe, i think guys are scared to put a pipe there. do you know anyone in Durban who can assist?

 

[moranor@axis]

it sounds hollow and empty because it is

call abel at Viper he will sort you out my guess is you will have to get branches made

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wont this void you motor plan thou?

 

[SachinBharat]

OK thanks for the heads up, but guess what i went and seen him Last week, its going to cost R7000 to rectify with the branch. everyone giving me different advise, my cuzzie said it wont make any difference with performance should just put a silencer cost R900 bucks and the noise will disappear, but what about the performance? i was reading up on BMW the factory fitted system is designed for the engine to give you that BMW performance and tone, now i lost both of them. Looks like i will just have to save up and go with Viper.

 

[akash]

Sorry i've got an E90. Google is your friend, as far as i know on turbo setup from the down pipe you can run a straight pipe with the required silencers. I'm sure you will find a quite a few exhaust setups for the one series on the web.

 

[moranor@axis]

R7000 that must be for a full exhaust he quoted me R3500 for a custom branch on my car... i know a guy in pmb that can make you a branch the only problem is it will take up to two weeks but he wont charge more than R2500 to do the job do you have any pics of it maybe there is an easy solution?

---

does it look like this?

 

[PRAVEEN M]

As far as i know they were supposed to remove the cats completely and put in a straight pipes, not put the cats back. Then put in cat foolers for the exhaust sensors so as to not pick up any errors. The next step would be to remap your ECU to optimize the new change to the exhaust.

have you seen where the catz reside on the 1 series? its on the downpipe, i think guys are scared to put a pipe there. do you know anyone in Durban who can assist?

Take the car to Kumaran at Piper racing he has done decat on these cars

 

[frikkieh]

As far as i know they were supposed to remove the cats completely and put in a straight pipes, not put the cats back. Then put in cat foolers for the exhaust sensors so as to not pick up any errors. The next step would be to remap your ECU to optimize the new change to the exhaust.

So, what is cat fooler? I understand why, but how does it work?

 

[moranor@axis]

they take a small piece of cat put it in a tube that is welded to the exhaust the after cat sensor screws into the other end of the tube...
basicly it lowers the temperature of the sensor so the ecu thinks the cats are still in place

 

[frikkieh]

they take a small piece of cat put it in a tube that is welded to the exhaust the after cat sensor screws into the other end of the tube...
basicly it lowers the temperature of the sensor so the ecu thinks the cats are still in place

Clever trick.

 

[moranor@axis]

yip i thought it was quite ingenious when i found out how it was done

 

[Sankekur]

On some cars is also works to fit the post cat sensor lifted out of the pipe a bit, but this doesn't work on BMW's.

I wonder if it would be possible to cancel out the error caused by the post cat sensor in software.

 

[moranor@axis]

i know you can do it with a uni Q so guess it could also be done with software :dunno:

 

[Sankekur]

Personally that is the way I would rather go.

 

[moranor@axis]

i did not have this problem but if i did i would have had the error cleared when i did my chip...
but if you only doing a decat i dont think its a necessity to get a chip so then cat foolers make sense

 

[Sankekur]

But for me it might be better idea as my plan is to do the whole shebang, full exhaust and header plus chip, one day