Intelligent Deceleration Fuel Shut-Off (iDFSO) - Dodge Challenger Forum: Challenger & SRT8 Forums

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post #1 of 2 (permalink) Old 08-24-2011, 04:23 PM Thread Starter
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Intelligent Deceleration Fuel Shut-Off (iDFSO)

I was searching around today trying to find more information on the fuel shutoff feature. It is included in both the auto and the manual transmission and that when you take your foot off the gas it shuts off fuel and uses momentum to keep everything moving. For the automatic this is a pretty obvious time, however with the manual I was assuming it doesn't work if you neutral your car down a hill. If it did this while neutral there would be no momentum since it isnt being transfed from wheels to engine and the car would stall out.

What this leads me to wonder is which would be more economical in a manual, coasting in gear which is going slow you down faster due to engine breaking but which will cut fuel and use momentum to keep the engine running or neutral the car and coast for longer without having to give the car gas, but never getting the fuel cut off because in idle it needs to keep the engine running. Or am I missing something that does allow the car coasting in neutral to cut fuel.

And to clarify, this system exists seperate from MDS and is in both manual and automatic cars.

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post #2 of 2 (permalink) Old 08-24-2011, 06:01 PM
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Personally I cannot stand this feature and wonder if it can be tuned out. I live in the "mountains" of Western NC, and I have a nice aftermarket exhaust that burbles sweetly on decelleration or descending. After 2-3 seconds of sweet sounding burble, it suddenly cuts out and then... nothing. I want my burble, I like my burble, I need my burble.


2010 PCP Challenger SRT8 6-speed
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2005 Dodge Ram SRT10 "Yellow Fever #285"
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