[SDemetris]

Going to get my catless tune from Active tomorrow. Any thoughts on asking them to disable cold start? No real need for it now that I have no cats right? It'll save me a few drops of gas and a few stares this winter when I start up and people are walking past my house on their way to class are my thoughts.

[JDane07]

I didn't even realize this was a thing lol

[SDemetris]

Originally Posted by JDane07

I didn't even realize this was a thing lol

yupp. no more 1300 idle for 90 seconds when I start up. Pretty sure the only reason for it is to warm up the cats, but I could be wrong

[dailowill]

Let me know if you get the cold start disabled. I've been asking since March and they keep saying they busy on other projects...

[Three_thirty_I]

I would have thought that an engine needs a brief rich (warm up) regardless of having cats or not. If the engine is able to start and idle cleanly from cold without this, then sure, makes sense to disable. For what it's worth, from cold my 330i starts and only briefly goes up to no higher than 1500 rpm and then drops and settles at 1000 rpm - at this point I start driving off, so I would think that it would slowly make its way down to normal idle as it warms up. But it doesn't at all stay at this 1300 rpm for 90 seconds...

[mojobmw_e90]

My tuner disabled my cold start and it sound means now at start up. Starts aggressive kinda like a lambo does and sits at idle rpm..was hard to get used to, but i Love it

[Three_thirty_I]

May as well post, this is my 330i from cold start on a cool to moderate Spring day, and this is pretty much how it is always from a cold start:

How does this then compare to what you have?

[hassmaschine]

You guys are talking about cat heating delete, not cold start. High idle and a richer mixture are not things you want to turn off. Retarded timing, vanos adjustments and further cat enrichment can be turned off of course.

[Soul_Glo]

Originally Posted by SDemetris

yupp. no more 1300 idle for 90 seconds when I start up. Pretty sure the only reason for it is to warm up the cats, but I could be wrong

I asked two dealerships why my car has always done this and they said they had no idea. Bastards! I always felt that the car was adjusting in some way or preparing but now I know for sure it is a cold start!

[SDemetris]

Well i asked AA to do a cold start delete when I sent them my old map Friday. I'm guessing they just didnt have time to change it and get it back to me before the end of the day, so I'm still waiting for it. I'll let you guys know what comes of this.

[Three_thirty_I]

So how does it compare with the start up of mine? Could it be a 330i/328i difference, ecu and software? And I gather this is with stock and tuned software.

It makes sense that the cat warm up and normal engine warm up are then two different things - as far as I know, the exhaust flap (when driving off slowly) and the partial closed of the throttle body is part of this warm up. The exhaust flap when closed helps keep more of the warm exhaust gasses around the cats, but could be wrong saying that.

[MacE90]

Don't you have to code out cold start? I don't think it is tune related.

[Three_thirty_I]

Originally Posted by MacE90

Don't you have to code out cold start? I don't think it is tune related.

I was referring to the cold start idle that these guys are talking about which seems very different to what I am seeing with my 330i.

[hassmaschine]

you can't "code" out anything on the DME. it requires hex editing & binary flashing, not something you can do with NCSexpert.

again, there are two things we are talking about here - "cold start" which you need because the engine requires more air and fuel when it's cold, and "cat heating" which you don't need and just makes for a rough idle/wasted fuel.

[SDemetris]

Hmm. Not entirely sure theyre on two different processes. Like it might be one feedback loop map for cold start and cat heating. Like they might have one piece of code that does bith things.. It makes sense that theyre two different processes though.. i guess well see what they say.. what would be the negatives of no cold start tho? I think it would just be a lower idle and maybe a little longer time to reach operating temp.

[hassmaschine]

They are seperate, i know it for a fact.

Without cold start your engine would stall unless you kept your foot on the throttle, and it would effectively run lean. At 32f a port injection engine can require 50% more fuel just to keep running.

[SDemetris]

Originally Posted by hassmaschine

They are seperate, i know it for a fact.

Without cold start your engine would stall unless you kept your foot on the throttle, and it would effectively run lean. At 32f a port injection engine can require 50% more fuel just to keep running.

Ok. Hopefully Active knew what i meant then

[hassmaschine]

Yeah im sure they do

[dailowill]

Originally Posted by SDemetris

Ok. Hopefully Active knew what i meant then

They should. Andrew called it "Cold Start" here http://www.e90post.com/forums/showpo...&postcount=663

[Daily911]

nice

[chris82]

e90post is the only place this kind of question would be asked...

Embrace that cold start, it's the best part of the day

[mmmnot]

Originally Posted by SDemetris

yupp. no more 1300 idle for 90 seconds when I start up. Pretty sure the only reason for it is to warm up the cats, but I could be wrong

I actually adore this. I hate my neighbors. Early morning Winter warm ups is my revenge to their crotch rocket summer noise.

Originally Posted by chris82

e90post is the only place this kind of question would be asked...

Embrace that cold start, it's the best part of the day