200tdi, 230/lt77 cruising - Defender Source
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  #1  
Old November 12th, 2011, 04:48 PM
84ninety
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200tdi, 230/lt77 cruising

What have others achieved as far as highway cruising speed with this set up?
Anything more than 55mph seems to get REALLY noisy...
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  #2  
Old November 12th, 2011, 05:15 PM
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What ratio transfer box are you running?
Mine originally had a 1.66:1 which was swapped out when the 200tdi went in. That broke and all that was available at short notice in good condition used was a 1.222: ratio, so that went in. Cruising at the legal max in GB (70 mph) is a little noisy but there's no sound insulation to speak of.
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Old November 12th, 2011, 05:16 PM
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What's the LT230 ratio? Might be a 1.6 : 1? I had one of those on my 110 and it was cruising a 55-60 mph top.
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  #4  
Old November 12th, 2011, 05:36 PM
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Would the ratio be stamped of the case anywhere? No idea what the ratio is
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Old November 12th, 2011, 05:41 PM
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Quote:
Originally Posted by 84ninety View Post
Would the ratio be stamped of the case anywhere? No idea what the ratio is
There should be a sticker on the back face near the filler plug.
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Old November 12th, 2011, 06:31 PM
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The tag is broken off. I can go 65-70 just doesnt feel too comfortable..
Are the ratios changable without buying an entirely new transfer case?
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  #7  
Old November 12th, 2011, 08:37 PM
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You could have a 1.2 like in all US spec models, a 1.4 typical in ROW diesels, and 1.6 in some MOD applications. I found this the other day while thinking about re-gearing, (I think it is right) in high a 1.4 with 3.56 gears is like a 1.2 with 4.11 gears. All of the low range are the same. So I would figure that if you have a 1.4 box then you could go down to a 1.2 box and get some more top end. I live in the mountains and have the 300 Tdi with a 1.4 box. I easily can go over 70 MPH running 265/75-16 All terrain tires. But not up the hills.
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Old November 12th, 2011, 08:42 PM
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I have the same setup in a 110 and 70 on the Merritt is a life affirming experience and sounds like the engine is maxed out.
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Old November 12th, 2011, 09:20 PM
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I have a 200tdi, LT77, LT230 with 1.4 gears, and 4.10 axle gears. I top out at 70mph at 3k RPM. Can't carry on a conversation inside the truck though!
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Old November 12th, 2011, 10:19 PM
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My 1993 RRC is a factory 200tdi with LT77 (H suffix), 1.2 LT230 (replaced failed Borg), and 3.54 diffs. Will cruse at 75mph (on GPS) with 2600rpm and it is not very load, easy to talk or listen to stereo. Gets between 26 and 30 mpg on the hwy. It does have smaller tires than a defender, 225/75/16 I think but I plan to switch to 235/85/16.
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Old November 13th, 2011, 12:34 AM
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I could cruise 75 with a 1.4 tcase and 285/75's and a full width intercooler. Most all early defender diesels had 1.66 boxes. Most 110's with 2.25 or 2.5 petrols also had 1.66's. What engine was originally in your truck ?
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Old November 13th, 2011, 08:31 AM
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Interesting. It came as a NA diesel. Are the gear changable or will it need to have a new transfer case if i cant get used to it?
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Old November 13th, 2011, 11:21 AM
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Quote:
Originally Posted by Wolf Fabrication View Post
I have a 200tdi, LT77, LT230 with 1.4 gears, and 4.10 axle gears. I top out at 70mph at 3k RPM. Can't carry on a conversation inside the truck though!
Same setup in my old 110, although I don't know what my axle ratios are. Seems like there's more left in her at 70mph, but definately can't hear very well and the steering wheel has your undivided attention! I'll add that the 235/85/16 mud-terrains certainly don't help with the noise and handling. No sway bars on this UK truck. Very comfortable at 60mph though.

New (to me) '86 110 (which I have yet drive BTW) is fitted with 300TDI, R380 and 1.22 t-case from a RRC (not sure what the difference if any between RRC and Defender t-case). Again, I'm not sure what final gears it has, but maybe somebody knows how to tell? PO tells me that it will do 90, which I find to be an aggressive claim (if not an outright embellishment). In fact, I'll probably never put that claim to the test given the handling characteristics. No sway bars, but double HD shocks on rear to keep the ass stable. The IP has been tuned/optimized as well and there is no center muffler, which I don't know what the benefit of that is, but we'll see. I'd be happy if it cruised at 70-75 @ 2,800RPM and you could carry on a conversation.
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  #14  
Old November 13th, 2011, 12:44 PM
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Aynsley your first truck had 3.54 to 1 axle gearing. Jonathan has 35 inch tires and changed his axle ratio's to handle those. Tire size makes a big difference.

84ninety given how early your tcase is you will want to upgrade to a later one with a cross drilled input shaft in order to remedy the trans out put shaft wear problem. A 1.4 tcase will make your gearing 15% taller and is the transfercase 200 tdi 90's came with. A 1.2 (30% taller gears) which is available @ pretty much every salvage yard came in all disco 1's and is a direct bolt up. Your truck should handle one fine given how light it is. I have a 1.2 in my 130, and my brother is running one in his tdi 110. Locally here @ the pick and pull yard a 1.2 tcase is $60
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  #15  
Old November 13th, 2011, 12:54 PM
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My 84 ninety sounds good up until about 60 then gets kinda noisey - not engine noise per say but resonance of body and tires, etc. There is a sweet spot at about 68 (indicated) where it all seems to cancel out. Once I put the windows in the back, it shored up the back and lessened the noise. Not sure what ratio the transfer case is, haven't seen the stamp.
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  #16  
Old November 13th, 2011, 06:40 PM
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Also makes me think of the sticker I. Saw on the back of a Defender in the UK that said "you can go fast but I can go anywhere!"
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