Re-gearing my LT230 - Defender Source
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  #1  
Old November 4th, 2014, 06:06 PM
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Re-gearing my LT230

If you've followed to progress of Operation: Get Kent aka 85Red110 a Truck, you might know that my ROW 110 3-door has an ACR 2.8 petrol, LT77, and 1.667 LT230. The engine is a hopped-up 2.5 petrol and runs awesome. The problem I have had is that the truck tops out at about 60mph on the highway before things start getting uncomfortable. The truck rolls as smooth and stable as you can ask for, and it would probably be comfortable at 85mph if the drivetrain could take it that high. On my long trip down to Brewie's place a few weeks ago, (where he built me an awesome cage) I achieved a dismal 11mpg.

For a 4cyl gas motor, I feel that it should be better than that on the highway, especially since my truck is about as light as a 110 can get. The easiest (and cheapest)solution I can think of is to swap out my 1.667 transfer case with a D1 1.22. My calculations tell me that my top gear rpms at 60mph will drop from 3550 to 2600. This should be good enough to make the ride more comfortable, and hopefully yield better fuel economy..... hopefully.

I know I might lose some giddy-up off the line, but I think it will be a good trade-off.

Any advice?

Thanks in advance,

Kent
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  #2  
Old November 4th, 2014, 06:46 PM
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Do you know which LT77 you have?
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Old November 4th, 2014, 07:03 PM
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If you decide to do it (which you should I think) I will do an even trade for you- 1.2 LT230Q in exchange for that 1.6 box. I think the only modification you will have to do is drill/tap two little M8 holes for the parking brake lever? Overlander could chime in about this, he did one a while back on his truck.
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  #4  
Old November 4th, 2014, 07:09 PM
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The big question is there enough grunt at idle to pull 1st gear. I've no experience with that engine to know. I wouldn't do it in a diesel with a 110 (I would do a 1.4), but the 2.8 petrol might be okay. It would help to know which LT77 as there are some different gear choices available.
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  #5  
Old November 4th, 2014, 07:25 PM
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I think a 1.2 is going to be too tall. I would go to 1.4. Not sure what gearing your thirds are, but that is another option to tweak the final drive ratio.

Ultimately, the grunt of the little petrol motor and it's ability to shove a brick down the road at higher speed will be the major factor.
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Old November 4th, 2014, 07:42 PM
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Quote:
Originally Posted by Red90 View Post
The big question is there enough grunt at idle to pull 1st gear. I've no experience with that engine to know. I wouldn't do it in a diesel with a 110 (I would do a 1.4), but the 2.8 petrol might be okay. It would help to know which LT77 as there are some different gear choices available.
I made this "mistake" although I am going to by choice live with it for a while while I dial in the truck. I did a 1.2 behind my diesel. It is slightly too tall geared now with my 235/85/16's. Add weight and it will much worse. If I were to do it again I would go with the 1.4.
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  #7  
Old November 4th, 2014, 08:04 PM
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3500 at 60 and you're tapping out?
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  #8  
Old November 4th, 2014, 08:17 PM
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Quote:
Originally Posted by transientmechanic View Post
3500 at 60 and you're tapping out?
ACR website list the follow engine outputs for the 2.8 177 FtLb @ 2300 RPM 117 BHP @ 4100 RPM.

So at 3500 he's pretty darn close to max revs for the engine.

The 1.2 is sounding pretty good right now.
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  #9  
Old November 4th, 2014, 08:22 PM
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Kent,

Do the 1.4. Your 4 banger won't be able to pull the 1.2. I know you think it sounds all happy etc to have such low rpms but the engine will run out of steam on the hills and you'll be stalling on slight inclines or else slipping the clutch ALOT. plus you'll be lugging the engine alot and that is rough on the bearings.

The petrol 90's had the 1.4 (mine did) and your 2.8 should have a tiny bit more power. But the RPM range of the 32's and the 1.4 were well balanced. The tdi motors all sold with a 1.4 box on the 90s and 110s and they surely have more low end grunt and a flatter torque band than your ACR 2.8.

1.2...Don't do it. Your shit will be underpowered. Yes the 1.6 is too low for your setup. go with the 1.4 and don't expect more than 15mpg. Especially if you've got your foot in it.
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  #10  
Old November 4th, 2014, 08:31 PM
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I say balls out! Go 1.22, lower RPMs at highway speeds but you'll sacrifice acceleration off the line. I put 1.22 in a couple 110's that turned out awesome! Granted they are v8's, worse case you don't like it and you put a 1.4 in later.
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Old November 4th, 2014, 08:36 PM
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Quote:
Originally Posted by Brewie212 View Post
I put 1.22 in a couple 110's that turned out awesome!
A V8 should have a 1.2 to begin with...
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Old November 4th, 2014, 08:37 PM
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Quote:
Originally Posted by Jymmiejamz View Post
A V8 should have a 1.2 to begin with...
Well... if it were a NAS 110 it would have had a 1.4...
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Old November 4th, 2014, 09:00 PM
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Like I said earlier it would be good to know which lt77 before deciding. Post up the serial number of the gearbox.
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  #14  
Old November 4th, 2014, 09:41 PM
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It is a 50a, with the shorter OD gearing. I chose this for the additional weight I would be carrying. Perhaps a drop down in rotational mass with tire size to 235's, with 1.4 might be a good match with trans.
Greg
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  #15  
Old November 4th, 2014, 09:58 PM
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Try a roverdrive option, split the gears on uphills.
I have one on a ex mod set up behind a om617 & really like it.
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  #16  
Old November 4th, 2014, 10:47 PM
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Pretty ify with the 50a. A 51a would be safer.
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  #17  
Old November 4th, 2014, 10:47 PM
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Gentlemen,

I appreciate all the input. It's been very helpful. I'll let you guys know how it goes. I have a few decisions to make, one being whether or not I want the free small block 350 and turbo 400 transmission my brother has sitting in his garage...

Kent
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Old November 13th, 2014, 05:43 PM
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Options like a Roverdrive or complete transmission swap are out of the question. My budget is nearly zero. Ive dumped a lot of money into this truck already just to get it finished, and now I just want it drivable. I found a 1.2 out of an early D1 at a salvage yard here in VA. It was cheap, and accessible, so I gave it a shot. Last week, I swapped it and promptly went out to Gore this past weekend.

The drive out 66 was a smooth 60mph at far lower rpms than I had with the 1.6. Only problem was that it was in 4th gear. The truck never made it into 5th. Even so, I cruised at the same speed as I was with the 1.6, and still at rpms low enough to see my mpgs go from 11 to 14. It didn't pull well up hills, but neither did the 1.6.... I also had about 500lbs worth of stuff in the back.

Its pretty much a wash between the 1.6 and 1.2 behind the 2.8. So what do I do now? I can try to find 1.41 gears to put into one of the two transfer cases I have now, or I can keep it set up the way it is now and put a V8 in sometime down the road when I have raised the money for it.

That being said, does anyone have 1.41 gears laying around? If its cheap enough, Ill try it.

Thanks,

Kent

P.S. The picture is from this weekend in Gore. Stuck in the mud. Cherry popped.
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