110 200 tdi cruising speed - Defender Source
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  #1  
Old February 9th, 2010, 10:59 AM
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Jeff Labbé
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110 200 tdi cruising speed

Hi, I,m trying to figure out the average highway cruising speed of my 110. I fitted a 1 to 1.2 disco transfercase but the gearing felt to high. It wasn't great accelerating but it was cheap on fuel. (8 litres / 100 km) At around 100-105 km/h is a wind barrier so strong that the engine wasn't powerfull enough to pick up speed. After this a fitted a transfercase from a military 110. A 1 to 1.6 wich is ideal for hauling heavy stuff. The 110 feels like a train. The problem now is the top speed and fuel consumption at highway speed. With a top speed of 95-100 km/h at 15 litres / 100 km. It seems like the 1 to 1.4 (original unit) might be the answer. Can anyone tell me what are the real figures for cruising speed and consumption?
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  #2  
Old February 9th, 2010, 11:33 AM
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Andrew J. Hutton
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Or you could fit an overdrive or look at R&P ratios or tire sizes, they'll all have some effect.
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  #3  
Old February 9th, 2010, 11:59 AM
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1.2:1 and turn up the fuel a bit (after adding a pyrometer).
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  #4  
Old February 9th, 2010, 12:34 PM
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Yes, turn up the fueling... I run a 1.2 with an earlier box (0.83:1 5th). I can do 140 km/h before the power hits the wall. All I have is a little extra fueling and boost set to 15 psi.

I could also do 140 km/h when I had the 1.4, but it was revving the crap out of the engine. With the 1.2, sitting at 120 km/h all day is fine and comfortable on either the 32s or the 34s. This is real speed on a calbrated speedometer. I found no real difference in highway power when I changed transfer cases.
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  #5  
Old February 9th, 2010, 01:27 PM
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As I told you before it felt too tall as gearing (1.2) and as the vehicle is a 110 and I usualy bring all my tools in it + my dog, it felt like the first gear wasn't able to pull with the power output of a 200 tdi. When you say more fuel, what's inply exactly? I tought about having a bigger intercooler and have the turbo boost pressure higher as the fuel pressure. But unsure of what I have to do and I don't want to reduce the lifespan of my engine. 120km/h is a proper speed for me but I have to remain some acceleration. I live in Tewkesbury and it's in the mountain with hills and twisted road.. Need to be able to start fully loaded in that kinda uphill road.
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Old February 9th, 2010, 01:47 PM
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What gearbox do you have? This is important. I need the prefix. 1.4 will probably suit your needs best.

What exhaust do you have?

Any other mods we need to know about? Tires, axle gearing??

Turning up the fueling is pretty easy. You should fit an EGT gauge first. Auberins sells great units on eBay that are low cost. A boost gauge is handy as well. Then read this http://www.landroveraddict.com/smf/i...?topic=91564.0

You will never accelerate fast above 110.... It is just the laws of physics. You are driving a brick with a little engine.
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  #7  
Old February 9th, 2010, 06:10 PM
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Jeff Labbé
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Oh right, Tranny LT77 suffix, I dunno.. How do I find out? Exhaust is pretty straight. Front pipe is a regular one from Rover. I have an aftermarket silencer (like a cherry bomb; pretty straight without back pressure) and the rest is Rover type with the resonator at the rear wheel. The tires are the equivalent of 7.50X16 in BFGoodridge Mud type.The engine never been tuned up and there's a Kenlowe fan (heavy duty) up front. Normal Diff set up and the speed reading 'been done with a GPS. The truck is pretty straight. A 110 3 doors Ex-Mod.
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  #8  
Old February 9th, 2010, 08:20 PM
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On the LT77 reverse is up and to the left
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  #9  
Old February 9th, 2010, 10:24 PM
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Jeff Labbé
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Quote:
Originally Posted by Jpayne View Post
On the LT77 reverse is up and to the left
Weren't we talking about suffix?
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Old February 9th, 2010, 10:30 PM
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Yes, gearbox suffix.

After turning up the fuel a bit as described by Red, you should be able to comfortably cruise at highway speeds, even with a 1.2:1
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Old February 9th, 2010, 10:36 PM
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I think I don't know what I'm talking about, but yes you were talking about suffix.
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  #12  
Old February 9th, 2010, 11:00 PM
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I assume then you have the "old" gearbox and not the one that was with the engine. This gives you a lower 5th gear (0.83:1 versus 0.77:1).... Anyway, If you can get under and get the serial number it helps. There are different 1st and 2nd as well depending on what you have. The prefix is what I asked for as that will tell the gearing. The suffix will tell us how weak or strong the box will be.....

Regardless if you felt 1st was too high with the 1.2 then I would go with the 1.4, which is the stock correct transfer case for the engine. The fueling increase will help with pull away in first, but only a little.
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  #13  
Old February 10th, 2010, 08:29 AM
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Serial number on it's way. I'll get back to you lads in a couple of hours. I never thought that the same gearbox (LT77) could have different gearing.. When you're talking about fueling, How do I make this? Is there a tread or a webpage to step by step tweak the fuel pump?

------ Follow up post added February 10th, 2010 09:30 AM ------

Also, The gearbox - T-case - engine - EVERYTHING is a melting pot of different vehicle..
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Old February 10th, 2010, 10:53 AM
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Quote:
Originally Posted by CDNRover View Post
When you're talking about fueling, How do I make this? Is there a tread or a webpage to step by step tweak the fuel pump?
Post #6 above has a link.

------ Follow up post added February 10th, 2010 08:56 AM ------

Quote:
Originally Posted by CDNRover View Post
Also, The gearbox - T-case - engine - EVERYTHING is a melting pot of different vehicle..
For other people considering a 200TDI conversion.... Please buy the gearbox and transfer case that came with the engine. The gearing is designed to work with the engine and they are strong enough to deal with the torque. Other gearboxes may not do these things.
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Old February 10th, 2010, 04:36 PM
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Darn it.. There's a sh*$ load of numbers on the tranny... Should it start with NRC... ? how many digit usualy?

------ Follow up post added February 10th, 2010 05:37 PM ------

Is it located on the LH or RH?
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Old February 10th, 2010, 04:45 PM
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It should be like: 51A12345678E Lower right side of main gearbox case, below the filler plug in front of the side drain plug.

See this picture. http://217.34.53.228:9876/uploads/LT77.jpg The unpainted flat area below the fill plug.
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  #17  
Old February 10th, 2010, 05:03 PM
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Can you tell me what Rover intended to do with different gearing in the LT77? I guess it could be for Defender or Disco is it?
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  #18  
Old February 10th, 2010, 07:18 PM
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There are four different gear sets.

1) The early boxes (50A). These were used in the 4 cylinder pre-TDI engines.

2) The "military" boxes (51A). These had a lower 1st and 2nd than the 50A boxes for better off road use.

3) The LT77S boxes for the 200TDIs. These have a slightly lower first and high 2nd, 3rd and 5th than the 50A all designed to better match the new found power...

4) The LT77S boxes for the V8s. 1st is higher than the TDI boxes.

Also V8 and diesel boxes have different length input shafts and different bellhousings. Discoveries and Defenders also have different length input shafts and a different shift arrangement.

http://members.shaw.ca/red90/gears.html

There are also strength differences based on the suffix, http://www.ashcroft-transmissions.co.uk/part_1.html#pa1 which makes a big difference on whether your box will die a horrible death of not.
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  #19  
Old February 11th, 2010, 01:53 PM
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the # 50A0212671B I'll check with the informations you forward me... Thanks a lot for everything so far! If anyone as any ideal about what I should do.. Go ahead!

------ Follow up post added February 11th, 2010 02:59 PM ------

I'm a bit confused about the gearing. Can someone take some time to explain me what's all those number? I've check on http://members.shaw.ca/red90/gears.html But I dunno if the gearing is taller then what I'm supposed to have with the 200tdi. If it's smaller it should be perfect for a 1.2 transfer-case .. I'm losing it!

------ Follow up post added February 11th, 2010 03:06 PM ------

Maybe I should look for another tranny? Is it possible to fit a R380 on a 200tdi? What would be involved? With a R380 I could fit my 1.2 t-case? Sh%@t me mate! I'll be rebuilding that rig again and again!
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  #20  
Old February 11th, 2010, 03:18 PM
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2nd, 3rd and 5th are lower gears than the correct box. 1st is a little higher. Unfortunately 1st is what is controlling your decision.

I would suggest a 1.4 with that gearbox. Be aware that the "B" suffix box that you have has very small layshaft bearings and it will fail eventually. If you hear the box becoming noisy, then is the time to plan for a new box as the bearings are on the way out.

You can do an R380, but I would still stick with the 1.4 regardless if you were unhappy with 1st. You need the short shaft version. They are $1700 new in the UK. There are ones coming out of BATUS regularly these days, but it is always fun figuring out if it is in good shape or not. The BATUS R380 all seem to be the 51A style. These have lower 1st and second compared to your current box.

------ Follow up post added February 11th, 2010 01:20 PM ------

Quote:
Originally Posted by CDNRover View Post
tI'm a bit confused about the gearing. Can someone take some time to explain me what's all those number? I've check on http://members.shaw.ca/red90/gears.html
The numbers are the gear ratios. The number of times the engine turns for every revolution of the gearbox output shaft. Higher number is lower gearing.
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