Milltek Exhaust Questions - AudiWorld Forums


S6 (C7 Platform) Discussion Discussion forum for the C7 Audi S6 produced from 2012 - Present
Sponsored by:
Sponsored by:

Milltek Exhaust Questions

Reply
 
 
 
Thread Tools Search this Thread
Old 04-28-2014, 01:51 PM   #1
Audiworld Junior Member
Thread Starter
 
SierraBravo's Avatar
 
Join Date: Mar 2012
Location: Greenville, SC
Posts: 71
Default Milltek Exhaust Questions

On an S6, do you lose the 4 cyl mode with this system?

Also, for the high-flow cats it says it requires a stage 2 ECU remap. Does this stage 2 remap even exist for our cars?
SierraBravo is offline   Reply With Quote
Old 04-28-2014, 01:53 PM   #2
AudiWorld Senior Member
 
DeerHunter's Avatar
 
Join Date: Nov 2012
Location: Edmonton, AB
Posts: 1,045
Default

Quote:
Originally Posted by SierraBravo View Post
On an S6, do you lose the 4 cyl mode with this system?

Also, for the high-flow cats it says it requires a stage 2 ECU remap. Does this stage 2 remap even exist for our cars?
Can't answer the second part, but 4-cylinder mode is not at all dependent upon your exhaust set-up. Nothing will change in that respect.
DeerHunter is offline   Reply With Quote
Old 04-28-2014, 02:29 PM   #3
AudiWorld Super User
 
Join Date: Mar 2000
Posts: 5,759
Default

Quote:
Originally Posted by SierraBravo View Post
On an S6, do you lose the 4 cyl mode with this system?

Also, for the high-flow cats it says it requires a stage 2 ECU remap. Does this stage 2 remap even exist for our cars?
So far as I know there is no stage 2 remap at present. It basically disables the input from the post-cat O2 sensors so you don't throw a CEL due to the high flow cats. This can mess with emission testing protocols in some states causing you to fail if cat "readiness" is part of your OBD based emissions check. Best check before you do this.
Vijay is offline   Reply With Quote
Old 04-29-2014, 07:10 AM   #4
Audiworld Junior Member
Thread Starter
 
SierraBravo's Avatar
 
Join Date: Mar 2012
Location: Greenville, SC
Posts: 71
Default

So the 4 cyl mode is not dependent on the valve actuation. Got it, thanks.

It looks like the high-flow cats are for some time in the future. Now just to get some ceramic brake pads.
SierraBravo is offline   Reply With Quote
Old 04-29-2014, 02:17 PM   #5
AudiWorld Member
 
Join Date: Apr 2013
Posts: 134
Default

for 99% of my driving, it never even goes into 4 cylinder mode. you literally have be feathering the gas and coasting on a flat road under 70mph for it to even work. any slight throttle input and it goes back to 8 cyl. kind of pointless feature if you ask me.
mikec7s6 is offline   Reply With Quote
Old 04-29-2014, 02:30 PM   #6
Audiworld Junior Member
Thread Starter
 
SierraBravo's Avatar
 
Join Date: Mar 2012
Location: Greenville, SC
Posts: 71
Default

Maybe because the car is suppose to be left in cruise control for it to work. Just know that I have been able to get some impressive mileage on the highway and would like to keep it that way.
SierraBravo is offline   Reply With Quote
Old 04-29-2014, 03:52 PM   #7
AudiWorld Member
 
Join Date: Apr 2013
Posts: 134
Default

Quote:
Originally Posted by SierraBravo View Post
Maybe because the car is suppose to be left in cruise control for it to work. Just know that I have been able to get some impressive mileage on the highway and would like to keep it that way.
it works even without cruise control, you can switch to the efficiency meter and see the gauge turn green every time it switches back and forth. I don't really monitor my mpg but if I wanted an a6 that gets good gas mileage I would have got a diesel or 2.0t. ive had both of those as loaners and the mpg those cars return is quite impressive.
mikec7s6 is offline   Reply With Quote
Old 04-29-2014, 04:37 PM   #8
AudiWorld Member
 
Dr Chill's Avatar
 
Join Date: Nov 2006
Posts: 389
Default

Quote:
Originally Posted by mikec7s6 View Post
for 99% of my driving, it never even goes into 4 cylinder mode. you literally have be feathering the gas and coasting on a flat road under 70mph for it to even work. any slight throttle input and it goes back to 8 cyl. kind of pointless feature if you ask me.
My car is not nearly that sensitive. It switches to 4 cylinder mode even at 50 mph when I keep the throttle pretty steady. It's seemless.
Dr Chill is offline   Reply With Quote
Old 04-29-2014, 05:29 PM   #9
AudiWorld Super User
 
tenspeed's Avatar
 
Join Date: Dec 2011
Location: Honeoye New York USA
Posts: 3,667
Default

Quote:
Originally Posted by SierraBravo View Post
Maybe because the car is suppose to be left in cruise control for it to work. Just know that I have been able to get some impressive mileage on the highway and would like to keep it that way.
From the A6/S6 Product info book (page 6)

" V4 mode uses cylinders 1, 4, 6 & 7 & is accomplished by an electromagnetically controlled camshaft which rotates into a zero lift camshaft profile; the other cylinders are shut down & fuel injection/ignition halted after first taking in air to act as an air spring for reduced power loss.

V4 transition will occur in a fraction of a second under these conditions (coolant temperature of 86 degrees, 3rd gear or higher & between 960 & 3,500 rpm). V4 mode can last for up to seven minutes at which point all cylinders are engaged to prevent excessive heat loss & efficiency."

http://www.datarunners.net/AUDI/docs...20a6%20PIB.pdf
tenspeed is offline   Reply With Quote
Old 04-29-2014, 05:56 PM   #10
Audiworld Junior Member
Thread Starter
 
SierraBravo's Avatar
 
Join Date: Mar 2012
Location: Greenville, SC
Posts: 71
Default

Hmm, didn't know it would only last up to 7 minutes. When I think about for just a bit it does stand to reason. The heat loss could cause problems.

I just like the good mileage during road trips. Keeps the wife happy.
SierraBravo is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Audi A4 2002 S4 6spd 98k rsixxer23 Vehicles For Sale 4 01-06-2016 03:25 AM
S3 engine in other Audis? myroad Audi A3 / S3 /RS 3 MKII 10 09-17-2015 06:41 PM
:: ECS Tuning :: B8 A4 2.0T CORSA Performance RSC® Exhausts ECS Tuning-Audi A4 (B8 Platform) Discussion 0 09-03-2015 11:45 AM
Exhaust and Engine Breakdown leds giuseppepat Audi A5 / S5 / RS5 Coupe & Cabrio (B8) 0 09-02-2015 02:47 AM
:: ECS Tuning :: B8 S4 CORSA Performance RSC® Exhausts ECS Tuning-Audi S4 (B8 Platform) Discussion 0 09-01-2015 11:57 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -8. The time now is 11:21 PM.


 
  • Ask a Question
    Get answers from community experts
What's your question?
Send