1.2 vs 1.4 in a 110 Double cab - Defender Source
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  #1  
Old October 13th, 2015, 09:14 AM
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1.2 vs 1.4 in a 110 Double cab

I was thinking about getting a rebuilt tranny and T/C for my 110 and was thinking about switching to a 1.2 ratio.
I live on flat land, take the truck on the beach once in a while, other than that I'm pretty much a poser. 285 75 16s, 200tdi, lt77, really looking for more on the upper end on the highway, thoughts?

was going to do the frame swap first, but its near impossible to get Richards to return my emails.
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  #2  
Old October 13th, 2015, 09:40 AM
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The taller tires are already helping. What is the engine revving at on the highway right now? You need to keep it in the sweet spot otherwise you'll be changing down all the time.
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I don't know about the brakes, only their unreliability.
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Old October 13th, 2015, 09:48 AM
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Jonesy, went from 1.4 to 1.2 with the same exact set up this past weekend. He seemed thrilled with the results on the upper end.

There's a long thread that started Sat at about 8am and sign off at about 3am Sunday.
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Old October 13th, 2015, 09:58 AM
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Which exact LT77 do you have as that makes an impact? There are different gear ratios. Do you have the fueling turned up?
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  #5  
Old October 13th, 2015, 10:46 AM
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Quote:
Originally Posted by 1of40 View Post
Jonesy, went from 1.4 to 1.2 with the same exact set up this past weekend. He seemed thrilled with the results on the upper end.

There's a long thread that started Sat at about 8am and sign off at about 3am Sunday.
thanks
ill look for it
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Old October 13th, 2015, 10:49 AM
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Quote:
Originally Posted by tomaco1 View Post
thanks
ill look for it
BTW, as Red90 said, the version of LT77 can be important. I believe if you have a G or H suffix LT77 you should be better off than earlier suffixes.
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Old October 13th, 2015, 10:50 AM
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Quote:
Originally Posted by Red90 View Post
Which exact LT77 do you have as that makes an impact? There are different gear ratios. Do you have the fueling turned up?
late lt77 and the fueling is only up a bit, conservative due the fact i haven't installed the egt on it yet
it does have the upgraded intercooler, stock location, fatter allisport
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  #8  
Old October 13th, 2015, 10:54 AM
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Quote:
Originally Posted by tomaco1 View Post
late lt77
Need to know the prefix to determine gear ratio (the first two numbers in the serial number). The suffix is more to do with the strength of the internals.
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  #9  
Old October 13th, 2015, 01:41 PM
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My r380 experience might not be relevant, but I have 1.2 behind a 300tdi in the 90 and 1.4 behind the 300tdi in the 130. The 130 outperforms the 90 in every respect. The 1.4 is the right ratio when you compare the two side by side.
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  #10  
Old October 13th, 2015, 01:51 PM
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My r380 experience might not be relevant....
At this point, I "assume" that he does not have an LT77S (that came with the 200TDI) and thus has the 0.83:1 5th gear instead of the 0.77:1 that you have. This makes a huge difference in highway driving. Switching to 1.22 helps a lot. The downside is 1st becomes a bit high for a 110 unless you have the military ratios. This is why my suggestion is always to use the boxes that came with the engine.

Land Rover Gear FAQ

Final Drive ratios in 5th gear:
Pre-200TDI LT77 and 1.22 LT230 = 3.59
300TDI R380 and 1.41 LT230 = 3.84
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Old October 13th, 2015, 02:50 PM
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I'm gonna take a look at the serial number tomorrow
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Old October 13th, 2015, 04:40 PM
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I never liked the 1.2. Starting off on a hill is really noticeable.
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Old October 13th, 2015, 05:47 PM
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Quote:
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I never liked the 1.2. Starting off on a hill is really noticeable.
Low range?
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A friend of mine runs a land rover / range rover specialty repair shop. Based on his experience, they are capable of stopping anywhere, anytime, at any cost.

I don't know about the brakes, only their unreliability.
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  #14  
Old October 19th, 2015, 03:04 PM
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Quote:
Originally Posted by tomaco1 View Post
I'm gonna take a look at the serial number tomorrow
????
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  #15  
Old October 19th, 2015, 03:43 PM
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Quote:
Originally Posted by Rocky View Post
Low range?
Chris:
Low range doesn't change when you swap a T-case.
We're only talking high range here.
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Old October 19th, 2015, 04:19 PM
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Quote:
Originally Posted by rdavisinva View Post
Chris:
Low range doesn't change when you swap a T-case.
We're only talking high range here.
Chris was meaning to start off in low range on a steep hill.
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Old October 19th, 2015, 04:28 PM
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Originally Posted by Red90 View Post
Chris was meaning to start off in low range on a steep hill.
Oh sorry Chris, I sometimes forget myself and then remember.
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Old October 19th, 2015, 04:39 PM
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Quote:
Originally Posted by tomaco1 View Post
I was thinking about getting a rebuilt tranny and T/C for my 110 and was thinking about switching to a 1.2 ratio.
I live on flat land, take the truck on the beach once in a while, other than that I'm pretty much a poser. 285 75 16s, 200tdi, lt77, really looking for more on the upper end on the highway, thoughts?

was going to do the frame swap first, but its near impossible to get Richards to return my emails.
Talk to Jonesy, pretty much the exact same setup as you describe above but with 235 tires. He just switched from the 1.4 to the 1.2 tcase a week or so ago, and we drove down to URE & back.
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  #19  
Old October 19th, 2015, 04:41 PM
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Quote:
Originally Posted by nathanwind View Post
Talk to Jonesy, pretty much the exact same setup as you describe above but with 235 tires. He just switched from the 1.4 to the 1.2 tcase a week or so ago, and we drove down to URE & back.
you drove to URE, never made it back!!! Motha Licka...
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  #20  
Old October 20th, 2015, 08:51 AM
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for some reason the trans serial number is very hard to read, it may of come this way, or my kids may have done it while cleaning it up prior to install.
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