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      12-12-2012, 05:33 AM   #1
e90m3japan
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Cold start

I searched but could not find definite answer.
So I need your help!!! Please.

I was told by a tuner if I remove cold start it will damage my high flow cats!!?
Is this really true?!

Any help will be greatly appreciated!

Thanks
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      12-12-2012, 07:24 AM   #2
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I would say if BMW made it for the car to help with warm up then why remove it? Just remove the RPM limiter while your at it and hit her hard at a cold start up! Another thing, if you don't want to trust the tuner you might not want to let him touch your engine. Wait for it, waaaaaiit for it.........KNOWLEDGE BOMBED!!

Sorry, I am an *** and I know it.
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      12-12-2012, 07:27 AM   #3
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Reason for cold start is for emission purposes, don't believe removing it is gonna mess up the cats. Maybe the experienced tuners can chime in.
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      12-12-2012, 07:41 AM   #4
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Quote:
Originally Posted by STi_traitor View Post
I would say if BMW made it for the car to help with warm up then why remove it? Just remove the RPM limiter while your at it and hit her hard at a cold start up! Another thing, if you don't want to trust the tuner you might not want to let him touch your engine. Wait for it, waaaaaiit for it.........KNOWLEDGE BOMBED!!

Sorry, I am an *** and I know it.
I'm sorry for askin mr.know it all and I'm not ***!
I'm not here to start this BS. So please be more civilized....

You sound so immature.
Well, then I would like to ask you why do change your rims, tires, suspension, exhaust etc. if bmw made it for the car?!
Lol

Sorry for being defensive but you came so aggrevatingly.
I just wanted an answer since I have seen many people in this forum have done it and tuners here offers it and endorse it. So I thought it wasn't a bad thing, but this tuner say it's really bad like its the end of the world.
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      12-12-2012, 08:10 AM   #5
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Quote:
Originally Posted by e90m3japan
I searched but could not find definite answer.
So I need your help!!! Please.

I was told by a tuner if I remove cold start it will damage my high flow cats!!?
Is this really true?!

Any help will be greatly appreciated!

Thanks
The only purpose I found for cold start was for emissions and heating up the cats faster so they reach operating temps faster. Catless or even HFC doesn't need it.

You should ask the tuner why they think its terrible because I'm wondering too lol.
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      12-12-2012, 08:19 AM   #6
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I must add that some of us get rid of it so its not too loud (when cold) specially with full catless exhaust.
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      12-12-2012, 09:03 AM   #7
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Quote:
Originally Posted by C|3R1C View Post
The only purpose I found for cold start was for emissions and heating up the cats faster so they reach operating temps faster. Catless or even HFC doesn't need it.

You should ask the tuner why they think its terrible because I'm wondering too lol.
He says it damages the cats by not warming it up
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      12-12-2012, 09:04 AM   #8
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Quote:
Originally Posted by edwinm3 View Post
I must add that some of us get rid of it so its not too loud (when cold) specially with full catless exhaust.
That's why I want it get rid of it in the first place.
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      12-12-2012, 10:33 AM   #9
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Cold starts heat up the cats so they can operate normally right away.
Wether they heat up in 2 minutes vs 5 minutes wont damage them, it'll just make your car polute more per say, since the cats aren't operating at their full potential.
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      12-12-2012, 01:29 PM   #10
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Quote:
Originally Posted by e90m3japan View Post
I'm sorry for askin mr.know it all and I'm not ***!
I'm not here to start this BS. So please be more civilized....

You sound so immature.
Well, then I would like to ask you why do change your rims, tires, suspension, exhaust etc. if bmw made it for the car?!
Lol

Sorry for being defensive but you came so aggrevatingly.
I just wanted an answer since I have seen many people in this forum have done it and tuners here offers it and endorse it. So I thought it wasn't a bad thing, but this tuner say it's really bad like its the end of the world.
I'm truly sorry. Some questions just seem pointless to me at times, like this one! I take it back.

Personally I would say keep it, its loud for a minute or two and then gone and it helps warm the cats which wouldn't hurt to have. Maybe there is more to its use than we truly know. I think its nice to have, sounds like you are waking a giant beast! If your tuner recommends keeping it then take his advice, he is the pro and we are the ones paying for his knowledge. I hope this was a better approach.

*aggravatingly
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      12-12-2012, 03:26 PM   #11
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Quote:
Originally Posted by Beemw335
Cold starts heat up the cats so they can operate normally right away.
Wether they heat up in 2 minutes vs 5 minutes wont damage them, it'll just make your car polute more per say, since the cats aren't operating at their full potential.
Exactly this. There is no other "benefit" that we are aware off.
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      12-12-2012, 06:26 PM   #12
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So far no tuner has chimed in.
In theory, cold start does not reduce the amount of fuel being dumped into and out of the engine during engine warm up. Cold start decreases the time it takes to warm up the cats.

However, If the cats do not catalyze 100% for a long period of time, can they be clogged, or plugged? No one really researched this - at least I haven't seen any factual data. Its only a theory at this point.
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      12-12-2012, 07:10 PM   #13
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There could be some validity to the claim of it damaging the cats, when the car is open loop the car runs more rich. Therefore coating the cats with unburned fuel, to the extend and does it really hurt the cats since when they come to temp it probably burns off....who knows.

I for one kept the cold start... so when I take it to the dealer and they start the car when its cold it sounds OEM, other than the exhaust. In other words they hear it go through the cold start procedure. Having the cold start feature removed is a tell tale sign that software has been installed on the car.

Just my .02..

PS..love the way the car sounds with cold start...especially with no primaries and a good cat back.

Dave
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      12-12-2012, 07:14 PM   #14
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E90M3Japan, where in Yokohama do you live? My wife is from Fujisawa near Shonandai station, well actually Kao university. Love to hook up next time in Japan, we normally go in the summers.

Dave
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      01-13-2013, 03:06 PM   #15
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Sorry to resurrect this topic - but in my wife's 335i a rich condition led to the cat exploding. Basically over time unburnt exhaust chunkies went downpipe and settled in the honeycomb. It ignited at some point and sent cat material down system.

Is it possible - open mind everyone - that the cold start warmup is warming up the cats to also prevent rich exhaust from going into the cat and reducing cat life?
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      01-13-2013, 03:24 PM   #16
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Quote:
Originally Posted by peeti View Post
Sorry to resurrect this topic - but in my wife's 335i a rich condition led to the cat exploding. Basically over time unburnt exhaust chunkies went downpipe and settled in the honeycomb. It ignited at some point and sent cat material down system.

Is it possible - open mind everyone - that the cold start warmup is warming up the cats to also prevent rich exhaust from going into the cat and reducing cat life?
Food for thought, thanks for sharing. Also to note, BMW has had problems with the HPFP on the n54s Perhaps pump failure was to blame for the overly rich mixture - altough there should have been signs of the car misfiring. Anyways 335s don't have cold start.

I once had my cat puggled by a rich mixture and my car stalled (this is not a BMW).

In any case, has anyone stood behind the exhaust on the dyno? Close to redline, it feels like the exhaust is venting 30mph winds. So in theory, a trip to redline once in a while is good for the car
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      01-13-2013, 04:26 PM   #17
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Might be a little harsher on the cats, but I don't think it damages it by any stretch of the imagination.

That whole routine is in there for emissions purposes only.
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      01-13-2013, 07:59 PM   #18
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Well, I just had my ESS 600 upgraded to the 650. ACM called ESS and they said no to removal of the cold start. Cause it to stall. I'm also running full Akros but if it's emmisions only....?
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      01-13-2013, 08:40 PM   #19
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Quote:
Originally Posted by SVH View Post
Well, I just had my ESS 600 upgraded to the 650. ACM called ESS and they said no to removal of the cold start. Cause it to stall. I'm also running full Akros but if it's emmisions only....?
Shouldn't cause it to stall... That makes no sense.
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      01-13-2013, 10:59 PM   #20
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I think there are a couple of member running 625/650 kits with HFCs and I don't think they have any stall issues. If someone can confirm ...
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      01-14-2013, 07:20 AM   #21
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Yeah, well I just had my upgrade done last week. ACM called ESS as I specifically asked for cold start deleate. Sal at ACM said ESS said no....maybe Roman can clairify?
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      01-14-2013, 11:59 AM   #22
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Quote:
Originally Posted by SVH View Post
Yeah, well I just had my upgrade done last week. ACM called ESS as I specifically asked for cold start deleate. Sal at ACM said ESS said no....maybe Roman can clairify?
When the motor is cold and the blower is cold there is additional drag on the motor during a cold start. To help keep a proper idle during cold starts in cold weather regions where it takes vehicles longer to warm up we suggest to keep the cold start feature active on our SC vehicles. Our cold start on our SC file is not the same as stock, it is a modified version designed to help keep a slightly higher idle. In moderate weather regions it is not as much of an issue. You can get cold start removed on our SC software if you really want it.

Last edited by Roman@ESS; 01-14-2013 at 12:15 PM.
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