MPG Question (Converted 2.7 to 3.2) - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
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post #1 of 19 (permalink) Old 03-22-2011, 08:26 PM Thread Starter
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Question MPG Question (Converted 2.7 to 3.2)

Hey yall,

I've taken out the 2.7 (paperweight) and thrown a 3.2 under the hood. With the 2.7 I was getting around 28mpg (60mph) and currently getting 21mpg at 70mph (i haven't had a chance to test it at 60mph.

I am still using the 2.7's tranny and I also still have the 2.7's exhaust on the car as well... I'm sure the tranny will have an impact on the mpg but was wondering if anyone knew if the exhaust would...

Thanks...

Matt
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post #2 of 19 (permalink) Old 03-22-2011, 09:01 PM
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I have a 98 ES, 3.2 and 92k miles.
I just changed the coolant, oil and spark plugs.
I was getting about 18 mpg; now I'm getting 31 mpg.
Surprised the heck out of me!

I don't really think the smaller pipes will make any difference but I'm sure the 2.7 gears will.
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post #3 of 19 (permalink) Old 03-22-2011, 09:34 PM Thread Starter
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Ya know.. plugs are a good idea...
just added new coolant at the change and change the oil every 3k
Glad to hear your mpg!! Jelous
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post #4 of 19 (permalink) Old 03-23-2011, 01:09 AM
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I've got 30 MPG(65mph).2.7L.Fuel 93,K&N filter.
I guess 21 MPG -not good.

Last edited by Manlixer; 03-23-2011 at 01:12 AM.
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post #5 of 19 (permalink) Old 03-23-2011, 06:20 AM
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I get about 30mpg out of my 2.7, too. I hear it's not uncommon to get quite a bit less out of the larger engines.
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post #6 of 19 (permalink) Old 03-23-2011, 09:53 AM
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the exhaust will only matter above about 4500rpm. the 2.7 exhaust is 1/4 inch smaller id than the others.
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post #7 of 19 (permalink) Old 03-23-2011, 01:35 PM Thread Starter
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That makes sense about the exhaust.. Does anyone know what mpg I should expect with this 2.7 tranny? I was hoping it'd be more around 25 to 26mpg...

It's funny because while I had the 2.7 I was wishing I had a 3.2 engine or 3.5... lol I'm jelous of the 30's
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post #8 of 19 (permalink) Old 03-23-2011, 01:49 PM
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transmissions are the same (42LE) across all 2nd gen LHs. Only difference is the gear ratios.
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post #9 of 19 (permalink) Old 03-23-2011, 02:14 PM
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Quote:
Originally Posted by 01TrepSE View Post
transmissions are the same (42LE) across all 2nd gen LHs. Only difference is the gear ratios.
From what I've read, all of the 2.7 models came with 3:89 gears.
All of the rest came with 3:66.

That doesn't look like much of a difference but everyone seems to agree
that a 3.2/5 set up with the 3:89 gears has more pep.

Not sure how that extra pep detracts from the gas mileage...
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post #10 of 19 (permalink) Old 03-23-2011, 02:57 PM
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i did the conversion to from a 2.7 to 3.2, never having driven the 2.7, and i get about 20 or so in the winter and 25+ in the summer. i also reused the 2.7 transmission. its been mulled over before, mileage is about the same if not better with the 3.89 gears because the engine doesn't have to work as hard. and only turns slightly faster in OD.

its been recently discovered(by me at least) that with the 3.x engines the throttle body gets pretty dirty over 100k miles and the fuel mileage drops off pretty steeply. removal and cleaning is the best fix.

Last edited by ksa8907; 03-23-2011 at 03:00 PM.
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post #11 of 19 (permalink) Old 03-23-2011, 06:20 PM
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Quote:
Originally Posted by tgs View Post
From what I've read, all of the 2.7 models came with 3:89 gears.
All of the rest came with 3:66.

That doesn't look like much of a difference but everyone seems to agree
that a 3.2/5 set up with the 3:89 gears has more pep.

Not sure how that extra pep detracts from the gas mileage...
you'll lose an mpg or two for sure.
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post #12 of 19 (permalink) Old 03-23-2011, 07:48 PM Thread Starter
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Quote:
Originally Posted by ksa8907 View Post
i did the conversion to from a 2.7 to 3.2, never having driven the 2.7, and i get about 20 or so in the winter and 25+ in the summer. i also reused the 2.7 transmission. its been mulled over before, mileage is about the same if not better with the 3.89 gears because the engine doesn't have to work as hard. and only turns slightly faster in OD.

its been recently discovered(by me at least) that with the 3.x engines the throttle body gets pretty dirty over 100k miles and the fuel mileage drops off pretty steeply. removal and cleaning is the best fix.
How difficult is it to clean the throttle body? I do pretty well at learning as I go (replacing fuel injectors, timing chain, etc)

I'm heading to Colorado this summer and would like to get mid 20's if possible
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post #13 of 19 (permalink) Old 03-23-2011, 07:56 PM
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Quote:
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How difficult is it to clean the throttle body? I do pretty well at learning as I go (replacing fuel injectors, timing chain, etc)

I'm heading to Colorado this summer and would like to get mid 20's if possible
if you can replace timing chains you can clean a throttle body. remove the intake boot, and spray appropriate cleaner on the inside of the throttle body and take a clean rag and clean the throttle plate and walls. repeat a few times. Thats how i do it. ohh and whatever you do, if your using a can of cleaner dont let the straw fly off and go into the intake! it will also be difficult to start until all the cleaner that you sprayed on the throttle body gets out of the fuel system

Last edited by trepnician; 03-23-2011 at 07:58 PM.
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post #14 of 19 (permalink) Old 03-23-2011, 09:42 PM
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sometimes for a really nasty throttle body,, a old tooth brush helps big time,, spray in some carb cleaner,, brush it and spray again,, done
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post #15 of 19 (permalink) Old 03-23-2011, 10:53 PM Thread Starter
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Thanks for the tips. I'll give it a shot
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