200Tdi and LT230 Gear Ratio Question - Defender Source
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  #1  
Old November 24th, 2008, 12:43 PM
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200Tdi and LT230 Gear Ratio Question

I've got a 200Tdi and a LT230 with a ratio of 1.667:1 I'm looking at changing out the LT230 to one with a lower ratio; either 1.410 or 1.222. Right now, I'm running about 3k rpms @ 60mph (31.72" tires) and the 200Tdi doesn't sound too comfortable there. I've got a spare LT230 with 1.192:1 gears in it, but I'm afraid that's going to be too low.

Does anybody know what the 200Tdi's best cruising RPM range is? 2500 RPM? Ideally, I'd like to be able to get up to freeway speeds someday... I've done the math and am leaning towards the 1.410, but I'd still be around 3k RPM at 70-75 MPH.

Those of you with 200Tdi's (or 300s), what transfer case ratio are you running? How do you like it?

Thanks!
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  #2  
Old November 24th, 2008, 12:52 PM
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Over revving the tdi isn't good. I have the 1.4, running 33's and it seems to live happily there. Runs up to mid 80's on the interstate and does fine away from a light. Neil Steinhagen's truck has the 1.2 and 31 inch tires and that one also pulls nicely away from a light and on the highway. Both cruise nicely @ 70-75 (per gps) and get great mpg. These are both 200's. The 1.6 is a poor match for the tdi which makes its torque @ low rpm.
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Old November 24th, 2008, 01:16 PM
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Excellent data, thank you.

That's good to know about the 1.2. So I may just try my 1.192. I've got nothing to lose except a day of work!
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Old November 24th, 2008, 02:57 PM
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each jump is about 15% so the 1.2 is nearly 30% different from what you have now.
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Old November 24th, 2008, 03:16 PM
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Yup, with the 1.2 my main concern was getting it moving from a stop. Neil's truck has alleviated that concern somewhat. Thanks very much.

Time to tear apart that 1.192 and see how she looks inside!
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Old November 24th, 2008, 03:49 PM
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Yes, I'm happy with the 1.2. I have a Disco 200Tdi, not a terrible difference between Doug's Defender 200Tdi, but just wanted to point that out. I have no tach, so I can't comment on the rpm. In fact, I don't really know what I'm adding here.
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Old November 24th, 2008, 04:06 PM
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I also have a Disco 200Tdi. Forgot to mention that. Good to hear you're happy with the off the line performance and you've convinced me to give it a go. Thanks for chiming in here.
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Old November 24th, 2008, 04:12 PM
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How would a d-90 be with a 300tdi with a 1.2 and a set of 255/85's? Anyone have a setup like that?
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Old November 24th, 2008, 07:27 PM
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I can let you know in a few weeks. I'm going to try the 1.2 with a tdi and 255/85s. May be a bit much but we'll see. Seems most folks with the 1.2 box also have little tires. Which box are you running with the 35s?
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Old November 24th, 2008, 09:19 PM
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Not sure if it matters Chance, but please note that these guys are old farts and live where it's flat.

I can beat them both in my 3.5L V8 (although they pass me at the gas stations).
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Old November 24th, 2008, 09:36 PM
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Har!

Yeah, I was wondering about the little hills we have here in Colorado...

But what the hell, I've got the 1.192 Tcase sitting here. Might as well throw it in and try it. Won't cost me anything other than some bloody knuckles. And maybe a crushed chest.

Meanwhile, I'll try and trade that 1.667 monster for a 1.410. Just in case that 1.192 doesn't cut it in the mountains.
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Old November 25th, 2008, 09:17 AM
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Quote:
Originally Posted by cgalpin
Not sure if it matters Chance, but please note that these guys are old farts and live where it's flat.

I can beat them both in my 3.5L V8 (although they pass me at the gas stations).
the harder they come the harder they fall


2 tanks to your 1 on fuel running the same speed skippy
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Old November 25th, 2008, 09:41 AM
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Quote:
Originally Posted by Maryland 110
the harder they come the harder they fall
You mean the harder they try to run Daniel in High Range the harder they hit a tree.
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Old November 25th, 2008, 09:59 AM
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I've got the 1.2 case with the Disco 200tdi. The way I see it, I'm giving up take-off speed for nice highway cruising. Then again tdi's aren't made for drag racing. People have to be patient behind me when I take off from a light. BTW, I'm running 235/85s on a kitted out 110 with no engine mods (that's for Cabell).
I've thought about the 1.4 box, usually after I've just gotten out of my V8 Rangie. I wonder if the 1.2 box with 4.11 gears would be the set up?
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Old November 25th, 2008, 10:10 AM
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I've got the 1.4 behind a 300Tdi and I am switching for the same reasons that you guys are to the 1.2 I need to get over 60 for a while. I will have a rebuilt 1.4 for sale soon if anybody needs one.
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Old November 25th, 2008, 10:41 AM
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Do the lt77 and the R380 have diffrent ratios for any of the gears? Just wondering as that might make a diffrence in what t box I use.

Follow-up Post:

I should have know Terri would have it

http://www.expeditionlandrover.info/gear_ratio.htm
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Old November 25th, 2008, 11:20 AM
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That's interesting Buck. Good to know, thanks!
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Old November 25th, 2008, 03:47 PM
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Quote:
Originally Posted by cabell
I can let you know in a few weeks. I'm going to try the 1.2 with a tdi and 255/85s. May be a bit much but we'll see. Seems most folks with the 1.2 box also have little tires. Which box are you running with the 35s?
I have the standard tdi setup with the 1.4 t.case. I also have 4.11 gears to offset the tire size so I think it runs similar to a stock tdi with stock tires. I can cruise at 70 to 75 but its loud due to the high RPM. I dont know what it runs at since I dont have a Tach. I have a spare 1.2 but the 1.4 in my truck was brand new and only has 10k on it. The spare I have is unknown so I really dont want that in my truck.

I would guess the 300 with the 1.2 and the 255's would be fine though. Keep us posted

Can always switch to a 1.4 later or even a set of 3.90 gears in the future I guess. Have to figure it out on the gearing calculator.
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Old November 25th, 2008, 04:51 PM
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Quote:
Originally Posted by steinhnj
You mean the harder they try to run Daniel in High Range the harder they hit a tree.
guess he deserved that
Perhaps he should read the signature line on all my posts before casting stones.....
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Old November 25th, 2008, 05:18 PM
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