L8brker

Is there any way to make the car start every time like it does on full cold start ,
I love how it crackles and pops , has anybody looked into this or know what sensor makes it do this eg: intake air sensor ,or external temp sensor , coolant sensor ect .
I know it would dump a lot of fuel but those ten seconds are pure awesome.

m a x i m u s

+1. First time my kid heard the cold start and idle, he said it sounded like we were boiling water. Lol.

JCH

Delete the resonator and you'll get a little more bang on every start.

Need4Speed

Now imagine a cold start with an Eisenmann exhaust! Now that is music to our ears

johnnyblaze

Or long tube headers...

masonsoiza

Is it similar to the Aston Martin in which if you remove a fuse (the fuse for the exhaust flaps) from the fusebox it starts up like that everytime ?.

Dogtag114

My wife thought that the engine was "broken".

dc5itr888

I dont drive my car daily and theres times I wont drive it for 2-3 days and I especially anticipate the day I finally turn it on

khmergod

lol me too!

zcct04

has anyone installed a remote start so that you can enjoy the sound from outside the car?

CarHopper

^ You can just start it and walk behind. If it is a cold start it'll last long enough for you to get out and enjoy. Or just film it.

Yamdan

But what makes it sound like this during the cold start? And not after... :-(
I have deleted the secondary cats and center silencer but would still want a better sound during idle..

cyberorth

When I was looking at one before it became mine, the dealer casually gave me the key and had me start it inside the showroom. I found it awkward until...

DRBC43AMG

My old C43 is not too bad either on a cold start, after secondary cat and resonator delete. It doesn't have the fancy exhaust valves like you all have on the 63 though....

farhadahmad

WOW! what brand in how much did u pay?

johnnyblaze

Benzworks Long Tubes, Full catless, price will surprise you but you have to contact Serge @ Benzworks for the complete cost. I did mine in steps, when I should have just went full catless to begin with lol.

Overspooled

Same lol!

khmergod

Had to post my old vid. It was early 2012 and was pretty cold. I drove it around for a few minutes to warm it up before the vid. No way I would rev to 6k without warming it up lol.

cyberorth

Wow, you should really clean the underside of your tailpipes!

CarHopper

On a technical note, I'm not certain nor am I some guru, but I believe that this is being caused by the secondary air injection system.

My Sti would do the same thing where it idles a smidge higher when you start it and just has that popping at what not that we speak of here. However, once I deleted that system there was none of that.

Basically the secondary air injection (SAI) helps the car on cold starts get going, especially on days that are particularly cold. Up in NY sometimes it would take a couple extra cranks to get the Sti going because it didn't have the SAI.

Now, for C63's, many of you are in warmer environments so it will always be brief. Basically, you start the car, SAI automatically is going once you fire it up but then the system knows the car is already relatively warm or warm enough for the SAI to be shut down.

Now, if this is the case then there is no real solution. Deleting the system means no rumbling on cold starts because the is no SAI. Unless............ One of you gazillionaires makes some type of climate controlled garage and cool that baby down to 40 degrees and see how long the popping lasts, then crank it up to 75-80 for normal summer temps and see how long the popping lasts.

http://en.wikipedia.org/wiki/Secondary_air_injection

zcct04

Secondary air isn't associated with how well the engine starts, but does have impact on the sounds. During a cold start-up, the exhaust gas is pretty rich. The secondary air system is provides a method of reducing emissions after a cold start - it injects air into the exhaust manifold in order to help burn any remaining fuel. That causes detonation in the exhaust system which can really crackle and pop. Once the engine warms up, the exhaust becomes less rich AND the air injection point is moved down to the cats to help improve their efficiency, so the noise disappears.

L8brker

Exactly what Zcct04 said but I wonder what temp sensor triggers the secondary air pumps , if we could trick this sensor in to thinking its cold when we want ,we would get this explosive start every time

CarHopper

thanks, as I mentioned I am no expert on the system etc. but I feel like that is what causes the pulses in the exhaust.

cloverfield

Silly question, but how do I embed YouTube videos into a post?

CarHopper

Pretty sure a copy paste of the link will do the trick