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Re: What kind of MPG increase did you get from adding OD? [Re: feets] #2131936
08/13/16 01:08 PM
08/13/16 01:08 PM
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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. twocents

Re: What kind of MPG increase did you get from adding OD? [Re: feets] #2132123
08/13/16 05:30 PM
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The 3.07 was coupled to a trans with a deeper 1st gear and a much taller OD.
Not a fair comparison.

Re: What kind of MPG increase did you get from adding OD? [Re: feets] #2132296
08/13/16 09:45 PM
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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.

Re: What kind of MPG increase did you get from adding OD? [Re: Grizzly] #2132440
08/14/16 01:24 AM
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Hey, just for fun...CHECK OUT THE TOPIC THAT THIS THREAD IS ABOUT.
It is about mileage, not racing.

Re: What kind of MPG increase did you get from adding OD? [Re: Frankenduster] #2132693
08/14/16 02:14 PM
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"It's about mileage not racing"



Originally Posted By Frankenduster
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, mad I knew I should have used an '85 5.0 Mustang with a 5 speed as an example. rant

Re: What kind of MPG increase did you get from adding OD? [Re: feets] #2132705
08/14/16 02:32 PM
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One of the areas where new cars do well is the gearing. The lower/deeper transmission ratio gets the car moving quicker while the overdrives allow lower rpm cruising at speed. The new cars don't need deep axle gearing to get moving from the line. Our 2015 Challenger R/T had a 3.07 diff. The 8 speed auto has a 1st gear ratio of 4.7 to 1. Final drove through the OD 8th gear is just over 2 to 1. I'm guessing that the Viper has similar gearing.
I would LOVE to use an 8 speed in my car along with a 3.23 gear. I used to run a 3.91 with the Gear Vendors OD. I now run a 3.55 in the car since I sold the GV. The 3.91s and 4.10s gave snappy response though.

Re: What kind of MPG increase did you get from adding OD? [Re: Frankenduster] #2132706
08/14/16 02:33 PM
08/14/16 02:33 PM
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Originally Posted By Frankenduster
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 02:33 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
Re: What kind of MPG increase did you get from adding OD? [Re: feets] #2132791
08/14/16 05:03 PM
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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
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83 W350, Megasquirted with 46RH
Old news: 72 Demon street/race mobile
Latest: 70 Duster backhalf car
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Re: What kind of MPG increase did you get from adding OD? [Re: feets] #2133782
08/15/16 07:02 PM
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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 07:06 PM.
Re: What kind of MPG increase did you get from adding OD? [Re: feets] #2134018
08/15/16 11:43 PM
08/15/16 11:43 PM
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With the 4L60E and my 3:73 rear end gears i got near 20MPG cursing on dead flat roads at 65. Most of the time its' more like 15MPG though.

Re: What kind of MPG increase did you get from adding OD? [Re: MidPenMopar] #2134056
08/16/16 12:30 AM
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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.

Re: What kind of MPG increase did you get from adding OD? [Re: Frankenduster] #2134568
08/16/16 06:31 PM
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Originally Posted By Frankenduster
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.



iagree

Re: What kind of MPG increase did you get from adding OD? [Re: feets] #2134617
08/16/16 07:21 PM
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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.
Re: What kind of MPG increase did you get from adding OD? [Re: Frankenduster] #2134654
08/16/16 07:55 PM
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Originally Posted By Frankenduster
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

Re: What kind of MPG increase did you get from adding OD? [Re: Supercuda] #2134937
08/17/16 04:18 AM
08/17/16 04:18 AM
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Originally Posted By Supercuda
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

Re: What kind of MPG increase did you get from adding OD? [Re: feets] #2134962
08/17/16 06:29 AM
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Those cars had a 2.94 axle. The deep 3.09 1st gear made it easier to get moving with such tall axle gears.
Also, the Duster was a shorter car by 3 inches, saving weight.

Re: What kind of MPG increase did you get from adding OD? [Re: feets] #2135057
08/17/16 11:44 AM
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It is a far different frontal area vehicle,
But on a 5400 lb 1995 Ram two wheel drive Ram Magnum 5.9 V8 46RH 3.21 diff gears
With several aero tweaks
(Tonneau, lower air dam, vortex finders, low Cr tires)
60 mph in 0.69 lockedup tcc overdrive gear gives
22 MPG on level blacktop pavement interstate cruise
And
18 MPG in 1.00 third gear lockedup tcc 60 mph over the same stretch of I40 in NC
( but on different days so temperature and wind varied a little)

Re: What kind of MPG increase did you get from adding OD? [Re: feets] #2135199
08/17/16 03:16 PM
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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!



Re: What kind of MPG increase did you get from adding OD? [Re: feets] #2135585
08/18/16 12:07 AM
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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


Re: What kind of MPG increase did you get from adding OD? [Re: HotRodDave] #2137833
08/21/16 12:01 PM
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Originally Posted By HotRodDave
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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