Gearing with a 2.5na - Defender Source
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  #1  
Old May 15th, 2014, 07:25 AM
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Gearing with a 2.5na

Anyone running 1.22 with a stock 2.5na LT77 set up? I'm fairly certain my stock set up is 1.6 so I'm curious.

Clay
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  #2  
Old May 15th, 2014, 07:45 AM
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Never heard of someone trying... But I can't imagine it would be very functional.
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Old May 15th, 2014, 10:18 AM
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ThanksDave. I'm currently topping out at 62-63 mph on the flats with 235's so maybe I should be content. I'm assuming there's just not enough HP in a 2.5 to handle the 1.22 ratio.
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Old May 15th, 2014, 10:29 AM
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Ken Jagolta
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A 1.4 box would be the better choice, inmho.
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Old May 15th, 2014, 01:12 PM
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Don Bunnell
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Clay - I just came across this link while researching 5th gear/70mph RPM's for my OM617 conversion: http://www.grimmjeeper.com/gears.html

It even has LT230 and R380 in the drop down. LT77 info can be found here: http://www.keirhague.com/gearboxes.html

Terri Ann's site has some good info too: http://www.expeditionlandrover.info/gear_ratio.htm
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Old May 15th, 2014, 01:17 PM
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John B.
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Ashcroft has a gear calculator with every possible Rover gear train.

http://www.ashcroft-transmissions.co...atio_calc.html
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Old May 15th, 2014, 02:34 PM
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Robert Davis
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Quote:
Originally Posted by 1of40 View Post
ThanksDave. I'm currently topping out at 62-63 mph on the flats with 235's so maybe I should be content. I'm assuming there's just not enough HP in a 2.5 to handle the 1.22 ratio.
You might find any taller ratio will over gear the limited performance of the 2.5.
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Old May 15th, 2014, 02:40 PM
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Nah. 1.4 works well. The engine pull nearly the same from idle as the TDIs and there is enough power for 5th on the flats. You should be able to hold 70 mph at sea level with a 1.4. The 1.6 runs out of engine speed before then. I live in the land of the ex-BATUS 2.5NA Defender. They are everywhere and have many hours behind the wheel.

1.2 is a bit too high for pulling off in 1st in a 110 (just like a TDI) and 5th ends up being too high for highway speeds with the NA engine.
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Old May 15th, 2014, 04:02 PM
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Thanks Gents! This is going to be helpful.
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Old May 15th, 2014, 04:23 PM
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Ken Jagolta
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I was speaking from experience as I drove an X-MOD 110 that had a 1.4 box installed for a couple of years in the Boston / Cape Area. It was a nice improvement over the 1.6 it originally came with.
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Old May 15th, 2014, 04:58 PM
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Don Bunnell
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Forgot to add - I am running a 2.5NA with 1.6 lt230 but with 33" rubber. I haven't done much highway but around town and up to 50mph it is fine.
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