Electronic Overdrive Retrofit for D2?
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Rock Crawling
Joined: Jun 2014
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Electronic Overdrive Retrofit for D2?
Does anyone know whether there is an electronic overdrive kit that will fit the D2?
Last edited by austinlandroverbill; Nov 3, 2018 at 09:17 PM. Reason: mispelling
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Rock Crawling
Joined: Jun 2014
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I've been getting a little educated on retrofit electronic overdrives as I am starting to look at Spitfires, which came with a manual, electronically operated overdrive.
As the D2 pulls along strongly at 2500rpm and 65-70mph, I thought that dropping that to 1750-2000rpm with the same speed ratio could improve fuel economy.
Clearly that's what Triumph did with the Spitfire when the horsepower got up there enough to allow for the fitting of an offboard overdrive, so I thought why not on the D2 as it looks like it's been done on other vehicles, including Land Rovers.
Guessing if there were such a retrofit, it would go between the transmission and transfer case.
As the D2 pulls along strongly at 2500rpm and 65-70mph, I thought that dropping that to 1750-2000rpm with the same speed ratio could improve fuel economy.
Clearly that's what Triumph did with the Spitfire when the horsepower got up there enough to allow for the fitting of an offboard overdrive, so I thought why not on the D2 as it looks like it's been done on other vehicles, including Land Rovers.
Guessing if there were such a retrofit, it would go between the transmission and transfer case.
Rock Crawling
Joined: Mar 2012
Posts: 377
Likes: 94
It could go on the pto output
at lower RPM the torque converter wont be locked. The intake manifold is also tuned for around 2500 rpm so lowering the cruise RPM could be detrimental to economy since the drivetrain is less efficient at that speed.
at lower RPM the torque converter wont be locked. The intake manifold is also tuned for around 2500 rpm so lowering the cruise RPM could be detrimental to economy since the drivetrain is less efficient at that speed.
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Rock Crawling
Joined: Jun 2014
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33s? are these differential gears?
Looks like 2500rpm at 70 mph is as good as it gets.
I guess all us D2 owners just have to live with the reality that we're pushing the equivalent of a brick thru the air at 70mph
Looks like 2500rpm at 70 mph is as good as it gets.
I guess all us D2 owners just have to live with the reality that we're pushing the equivalent of a brick thru the air at 70mph
Our D2’s fly down the road very well vs a 97-10 Jeep Wrangler that is setup for off road... My 05 Rubicon could barely do 65MPH with a tailwind. My D2’s aren’t race cars, but once I’m rolling 75-80MPH isn’t hard at all. Now in the hills it’s more difficult, but still better vs a Jeep.
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