MDS Baffles [Archive] - Dodge Challenger Forum: Challenger & SRT8 Forums

: MDS Baffles


gkviper192
09-08-2012, 01:51 PM
Hey guys, has anyone run with the MDS baffles held open or gotten rid of them all together? Does having them open all the time increase sound in any way? I know i will get the weird motorboat noise in eco mode but im just curious as to whether or not anyone has any experience with keeping them open?

thanks

gkviper192
09-09-2012, 05:50 PM
anyone ???

KJ392
09-10-2012, 07:45 AM
Where are they located? I looked and didn't see any on my '12 A5.

charginscott
09-10-2012, 08:04 AM
If you want them on all the time just buy a 4 cylinder car.

MDS is the lifters bled down so the valves wont open and is done by an electric solenoid.
At least that is how it is on my 06 Charger

occar
09-10-2012, 03:38 PM
I assume he's talking about the flaps in the exhaust that started in 2012. I would imagine that without them, it would sound nearly exactly like a 2011.

charginscott
09-10-2012, 07:32 PM
Hmmm did not know anything about the flats in the exhaust?

Learn something new everyday !!

occar
09-10-2012, 08:27 PM
Dodge 2012 exhaust mds valve challenger 392 image by Bullish-8 on Photobucket (http://media.photobucket.com/image/dodge%202012%20exhaust%20mds%20valve%20challenger%20392/Bullish-8/IMAG0891.jpg)

rander
09-10-2012, 09:58 PM
I removed mine since MDS is now disabled. It does sound a little better and there is absolutely no drone. I actually like it.

KJ392
09-11-2012, 08:23 AM
I removed mine since MDS is now disabled. It does sound a little better and there is absolutely no drone. I actually like it.

So I am assuming that these flaps are controlled by the spring pressure (keeping them closed)? I couldn't see any wiring for solendoinds.
Did you do a cat back or are you still running the stock mufflers and resonators?

Thanks.

gkviper192
09-11-2012, 11:49 AM
I may try to get under there and see if there is a way I can rig the springs into keeping the flaps totally open all the time or maybe even remove the spring that close them somehow.

rander
09-11-2012, 05:57 PM
I cut out the spring valves and still using stock mufflers and resos

KJ392
09-12-2012, 07:34 AM
That's what I'll do too. No need for the valves with the B&G ECU.
How do you like your converter? I'm considering one too. Is it still street friendly?

Thanks

rayzazoo
10-13-2012, 03:29 PM
I was researching a bit more in to the MDS baffles and found this:

"For the ’12 model year, SRT8 versions of the Chrysler 300, Dodge Challenger and Charger and Jeep Grand Cherokee come fitted with a version of the fuel-saver technology that shuts down half the cylinders in their 470-hp 6.4L V-8 Hemi engine more often than earlier renditions of the deactivation system."

“On the freeway, if you set cruise control at 70 mph (113 km/h), you’ll be in 4-cyl. mode indefinitely, even up hills. It’s that good now,” he [Gilles] says.

I can say for my 2012 with the 2011 exhaust, my MDS no longer operates after 60-65mph on the freeway.

Here are the fuel economy numbers from the spec sheets:

2013 SRT8 Auto Challenger - 14 / 23
2012 SRT8 Auto Challenger (with MDS exhaust) - 14 / 23
2012 SRT8 Auto Challenger (with 2011 exhaust) - 14 / 22
2011 SRT8 Auto Challenger - 14 / 22

For reference, the 2013 SRT8 Manual Challenger is 14 / 23.

So, the baffles essentially might give you a 1 mpg increase on the highway and a more restrictive exhaust.

KJ392
10-13-2012, 06:07 PM
I was researching a bit more in to the MDS baffles and found this:

"For the ’12 model year, SRT8 versions of the Chrysler 300, Dodge Challenger and Charger and Jeep Grand Cherokee come fitted with a version of the fuel-saver technology that shuts down half the cylinders in their 470-hp 6.4L V-8 Hemi engine more often than earlier renditions of the deactivation system."

“On the freeway, if you set cruise control at 70 mph (113 km/h), you’ll be in 4-cyl. mode indefinitely, even up hills. It’s that good now,” he [Gilles] says.

I can say for my 2012 with the 2011 exhaust, my MDS no longer operates after 60-65mph on the freeway.

Here are the fuel economy numbers from the spec sheets:

2013 SRT8 Auto Challenger - 14 / 23
2012 SRT8 Auto Challenger (with MDS exhaust) - 14 / 23
2012 SRT8 Auto Challenger (with 2011 exhaust) - 14 / 22
2011 SRT8 Auto Challenger - 14 / 22

For reference, the 2013 SRT8 Manual Challenger is 14 / 23.

So, the baffles essentially might give you a 1 mpg increase on the highway and a more restrictive exhaust.


Mine is a '12 but was built in Nov.'11 and it doesn't have the baffles.
So Ray, next time your near Austin, PM me. I would like to have you drive my '12 A5 with the B&G 93 Tune. Bet once you drive one without Tq mgmnt, Cora will have a new brain.
Take care,
Kirby