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  #1  
Old 05-19-2017, 02:15 AM
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MDS deactivation

This aspect may have been discussed before, but could not find answer to my questions. The MDS on my Jeep works very well, but I have some questions. When I fitted a freeflow exhaust system, I had the cats removed. After 140 000km both cats looked in surprising very good condition. However, the exhaust noise and bad drone when MDS is on, made me put the cats back to kill the MDS drone. Could not find a suitable resonator to fit in place of the cats here in South Africa, or maybe the exhaust shop was not up to scratch.
Using software programs like HP Tuners, the MDS can be deactivated. Then I can remove the cats without having the drone noise. So, following questions:
1. What detrimental effect will result over time by not working the MDS components. Becoming "sticky" due to no movement and not working when switching on again.
2. What fuel saving does the MDS actually give on long distance driving.
3. Does the MDS not cause half the engine to wear much more than the other half, resulting in a "sick" half engine over time and that half becoming more breakdown prone?

Your thoughts please.

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Old 05-20-2017, 02:56 PM
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Re: MDS deactivation

Cant say for question 1

Question 2, mds is what allows the hemi to achieve its 23 mpg highway, with it disabled youll likely see teens

Question 3, it will not cause added wear by shutting down half the motor as these parts still are turning and are acting as an air spring
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Old 05-20-2017, 03:04 PM
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Re: MDS deactivation

Thanks Strongjeff
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