Why do we have, cold start?

Starry

S3 8V saloon... APR Stage 2....(-:
What are the benefits of the cold start? On my Rs4 I had it mapped out. I’m sure there is a reason for it but I wondered what it was and could it be disabled on the S3?
 

Lehn

Registered User
You mean where the idle revs are higher than normal?
 

TYb

Registered User
I don’t know the technicalities but isn’t it something to do with emissions, getting the engine up to temperature as quickly as possible?
 

Ron240

Breaking the stereotype
Gold Supporter
Ive noticed this and wondered why it does it....but my car sounds mean as **** for about a minute or so after starting from cold. :)
 

ZipZap01

Registered User
This is due to emissions.

During a cold start the ECU operates the engine at high throttle, but runs the ignition timing extremely retarded to limit torque to control the engine speed.

This results in combustion being incomplete by the time the exhaust valves open, giving a meaty sound. The idea is to get lots of still burning fuel into the catalytic converter to warm it up quick.
 

Tej13

Registered User
Top