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Chrysler/Plymouth Voyager-Dodge Caravan Real World MPG

40 messages,  Last post on Oct 29, 2008 at 1:13 PM

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What is this discussion about? Dodge Caravan, Chrysler Voyager, Plymouth Voyager, Fuel Efficiency (MPG), Van

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#36 of 40 Re: MPG improvements? [xpatch] by shipo Apr 30, 2008 (8:25 pm)
Replying to: xpatch (Apr 30, 2008 11:12 am) For mileage and performance mods, you'll find none, zip, zero, zilch, nada when it comes to mods that will net you any benefits at all.   Best Regards, Shipo
#37 of 40 Re: MPG improvements? [xpatch] by mcondon Oct 27, 2008 (5:47 am)
Replying to: xpatch (Apr 30, 2008 11:12 am) I am new to this forum and just read your post on MPG improvements My previous van was a 93 with a 3.3 and the mileage computer When my muffler went I replaced it with a Dynomax super turbo and my mileage at a steady highway speed increased in the range of about .5 mpg. I know that this is very un-scientific but I am planning to do the same to the 03 that I currently have which now gets just under 24mpg highway. mcondon Replies to this message: shipo (Oct 27, 2008 7:30 am) mcondon (Oct 27, 2008 11:29 am) shipo (Oct 29, 2008 1:13 pm)
#38 of 40 Re: MPG improvements? [mcondon] by shipo Oct 27, 2008 (7:30 am)
Replying to: mcondon (Oct 27, 2008 5:47 am) What you're suggesting is that your old muffler had a rather significant blockage; there simply is no other way for a new muffler (Dynomax or otherwise) to have much of a measurable impact on highway mileage.   Think about it, when you're tooling town the highway your engine is operating at something like fifteen to twenty percent of its rated output, and that means that the demands on the induction and exhaust systems of your vehicle is extremely low. Personally I'll bet that the pressure difference inside a good condition OEM muffler and that of the Dynomax when at highway cruising speeds is virtually non-existent, and that means that the difference In fuel economy will be virtually zero as well.   Best regards, Shipo Replies to this message: mcondon (Oct 27, 2008 11:29 am) shipo (Oct 29, 2008 1:13 pm)
#39 of 40 Re: MPG improvements? [shipo] by mcondon Oct 27, 2008 (11:29 am)
Replying to: shipo (Oct 27, 2008 7:30 am) You have a good point there but the muffler I replaced was the OEM stainless muffler at 150,000 miles and the only problem was a small hole in the end cap. I also tried to use a complete 2 1/2" tailpipe without the resonator which seemed to get even better mileage but the noise echoed so badly inside the van that I quickly put the resonator back on and never tried to get an acurate mpg reading. Also, although the motor is only putting out fifteen to twenty percent of it's rated output it was still turning 2000 to 2500 rpm at highway speeds which seems to me to be putting out a significant volume of exhaust.   Am enjoying the conversation   mcondon Replies to this message: shipo (Oct 29, 2008 1:13 pm)
#40 of 40 Re: MPG improvements? [mcondon] by shipo Oct 29, 2008 (1:13 pm)
Replying to: mcondon (Oct 27, 2008 11:29 am) Also, although the motor is only putting out fifteen to twenty percent of it's rated output it was still turning 2000 to 2500 rpm at highway speeds which seems to me to be putting out a significant volume of exhaust.   Actually, the RPMs of the engine have very little to do with the amount of exhaust. In fact, if you're descending a hill and have the throttle closed, the engine will shut off the fuel injectors and there will be virtually zero exhaust coming through the exhaust pipe, regardless of the engine RPMs.   What does determine the amount of exhaust is the throttle setting, and that's a pretty linear equation. If you're running at about 20% throttle, then your engine will be producing about 20% of its max rated amount or exhaust regardless of engine RPM.   Best regards, Shipo

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