Re: What kind of MPG increase did you get from adding OD?
[Re: feets]
#2131936
08/13/16 02:08 PM
08/13/16 02:08 PM
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Joined: Aug 2005
Posts: 6,018 Salem
Grizzly
Moparts Proctologist
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Moparts Proctologist
Joined: Aug 2005
Posts: 6,018
Salem
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+ 5.5 mpg going from regular 833 to an 833od on a small block. There's no sense grumbling about putting overdrive in and not getting any fuel mileage returns because you're doing 75, 80mph. You want fuel mileage? Try 55 to 60mph, it works and that's all there is to it. Who's ridculous idea it was to put 3.91's and 4.10's in these cars should be slapped upside the head. 400hp First-Gen Vipers with 3.07's beat the pants off a stock muscle car with 4.10's.
Mo' Farts
Moderated by "tbagger".
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Re: What kind of MPG increase did you get from adding OD?
[Re: feets]
#2132296
08/13/16 10:45 PM
08/13/16 10:45 PM
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Joined: Aug 2005
Posts: 6,018 Salem
Grizzly
Moparts Proctologist
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Moparts Proctologist
Joined: Aug 2005
Posts: 6,018
Salem
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At 400-ish HP, first gear doesn't win a race: Second, third and fourth does.
Is a fair comparison with competent Drivers.
Mo' Farts
Moderated by "tbagger".
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Re: What kind of MPG increase did you get from adding OD?
[Re: Kern Dog]
#2132693
08/14/16 03:14 PM
08/14/16 03:14 PM
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Joined: Aug 2005
Posts: 6,018 Salem
Grizzly
Moparts Proctologist
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Moparts Proctologist
Joined: Aug 2005
Posts: 6,018
Salem
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"It's about mileage not racing" The 3.07 was coupled to a trans with a deeper 1st gear and a much taller OD. Not a fair comparison. Then, what did you post this for? I took this comment as some sort of excuse why a Viper is faster. I merely made an example of performance and mileage of a newer car that can be equaled in an old car by throwing a 727 and 3.91's in the dumpster is all I was saying. Called a win/win is it not? You've done it, right? Must you argue? Nevermind. Another misunderstanding. Dammit, I knew I should have used an '85 5.0 Mustang with a 5 speed as an example.
Mo' Farts
Moderated by "tbagger".
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Re: What kind of MPG increase did you get from adding OD?
[Re: Kern Dog]
#2132706
08/14/16 03:33 PM
08/14/16 03:33 PM
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Joined: Jul 2011
Posts: 817 Eugene, Oregon
Secret Chimp
super stock
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super stock
Joined: Jul 2011
Posts: 817
Eugene, Oregon
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Hey, just for fun...CHECK OUT THE TOPIC THAT THIS THREAD IS ABOUT. It is about mileage, not racing. I've stopped asking questions here as much because 75% of respondents don't read the whole original post and give irrelevant or already-done advice, or ask other questions... I spend more time re-explaining than I do learning anything.
Last edited by Secret Chimp; 08/14/16 03:33 PM.
1967 Dodge Coronet Deluxe station wagon
1.03" T-bars, QA1 arms/rods, Cordoba/GM Metric/Volare brake & knuckle, XHDs, Hellwig rear sway, 318 Magnum w/ air gap, 727, 3.23s
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Re: What kind of MPG increase did you get from adding OD?
[Re: feets]
#2132791
08/14/16 06:03 PM
08/14/16 06:03 PM
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Joined: Oct 2005
Posts: 1,305 Lakewood, Colorado
herkamer
pro stock
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pro stock
Joined: Oct 2005
Posts: 1,305
Lakewood, Colorado
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In the W350 with the 727, it would never get better than about 12-13 no matter how or where you drove it. When I added the 518 with lock up and going to TBI, it has got 18 going up the 2 big mountain passes here. I'd suspect flat land at 65 could get it up to 20. That's with 4.10 in the front/rear also.
Matt 69 Dart Swinger 340 83 W350, Megasquirted with 46RH Old news: 72 Demon street/race mobile Latest: 70 Duster backhalf car and even more
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Re: What kind of MPG increase did you get from adding OD?
[Re: feets]
#2133782
08/15/16 08:02 PM
08/15/16 08:02 PM
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Joined: Jul 2006
Posts: 619 nj
JAMESDART
mopar
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mopar
Joined: Jul 2006
Posts: 619
nj
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It wasn't just an od swap, but my trail jeep, 78 wagoneer I was getting 16mpg highway after put a 700r4 in With 4.10s on 33s. I thought that was pretty good. Same deal with my 74 duster, it wasnt just an od swap. I put in a Re ringed mild smogger 400 and a viper t56, ford 8.8 with 3.73s and 25.5" tires I was getting 20 mpg highway. Mpg has dwindled away though after 10,000 miles.the re ring was just to get the car all setup. Part of me thinks 4.10s would make 6th gear a little more useable. In the end, they both cost me about the same to do. I can't say it was worth it just for mpg but I drove them both farther and more often after the over drive. If you can afford to waste the cash to do it properly, then yeah you should do it.
Last edited by JAMESDART; 08/15/16 08:06 PM.
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Re: What kind of MPG increase did you get from adding OD?
[Re: feets]
#2134617
08/16/16 08:21 PM
08/16/16 08:21 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Weren't teh late Feather Dusters and Dart Lites rated at 36mpg highway with the /6 and A833OD?
That would be a considerable jump above what my 72 Swinger with a /6 and A904 got, about double. I know there was a bit more than just the trans swap invovled, but even half that improvement would put me int eh mid-upper 20's.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: What kind of MPG increase did you get from adding OD?
[Re: Kern Dog]
#2134654
08/16/16 08:55 PM
08/16/16 08:55 PM
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Joined: Dec 2003
Posts: 36,840 South San Francisco, Californi...
MidPenMopar
Looking for fun? Keep looking
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Looking for fun? Keep looking
Joined: Dec 2003
Posts: 36,840
South San Francisco, Californi...
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Hey Stu, did you get your trans through Kiesler or the guys that took over that company? I'd like to hear from you about the swap. I got the trans conversion via Kiesler many moons ago. The whole install was not too bad BUT the controller box for the trans was no good from the start which took forever to get them to send a replacement box as they would not believe it. Also the trans leaked from the get go so i had to have it fixed by a transmission shop. Which i had to pay to have removed after the install and fixed and re-installed. In the end i got it all squared away but i sure hope the new owners of the company do a better job. Stu
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Re: What kind of MPG increase did you get from adding OD?
[Re: Supercuda]
#2134937
08/17/16 05:18 AM
08/17/16 05:18 AM
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Joined: Nov 2008
Posts: 1,491 Lethbridge, AB, Canada
dangina
pro stock
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pro stock
Joined: Nov 2008
Posts: 1,491
Lethbridge, AB, Canada
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Weren't teh late Feather Dusters and Dart Lites rated at 36mpg highway with the /6 and A833OD?
That would be a considerable jump above what my 72 Swinger with a /6 and A904 got, about double. I know there was a bit more than just the trans swap invovled, but even half that improvement would put me int eh mid-upper 20's. hmmm I'd be cuious to know this as well
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Re: What kind of MPG increase did you get from adding OD?
[Re: feets]
#2135199
08/17/16 04:16 PM
08/17/16 04:16 PM
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Joined: Jan 2005
Posts: 12,424 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,424
Kalispell Mt.
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The feather also had a very lean carb and only got driven 55 mph in the test. Modern cars would probably get 5 more mpg if they only had to do 55 mph.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: What kind of MPG increase did you get from adding OD?
[Re: feets]
#2135585
08/18/16 01:07 AM
08/18/16 01:07 AM
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Joined: Aug 2005
Posts: 6,018 Salem
Grizzly
Moparts Proctologist
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Moparts Proctologist
Joined: Aug 2005
Posts: 6,018
Salem
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I'd believe the Feather Duster EPA numbers, if the drive train was in an Omni. I am so glad this thread still exists, but "dmerc" has proven what can be done with overdrive in an old car: 25 mpg 408 small block If I remember right, a follow up post he hit 27mpg
Mo' Farts
Moderated by "tbagger".
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Re: What kind of MPG increase did you get from adding OD?
[Re: HotRodDave]
#2137833
08/21/16 01:01 PM
08/21/16 01:01 PM
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Joined: Jan 2004
Posts: 9,066 Eugene, Oregon
minivan
master
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master
Joined: Jan 2004
Posts: 9,066
Eugene, Oregon
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The feather also had a very lean carb and only got driven 55 mph in the test. Modern cars would probably get 5 more mpg if they only had to do 55 mph. Whoa, now you sound like Jimmy Carter... It was proven the national 55MPH speed limit did NOT use less fuel, that was why the Government changed the sheeples "mindset" to "saves lives".... Lets not ever bring this HORRIBLE ( 55 mph ) thing back.. I had to live ALL of the years it was in existence while I was in outside sales driving....
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