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  #1  
Old January 14th, 2016, 03:42 PM
Roverlab
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Trevor Griffiths
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So, now I'm a 110 owner

Picked up an '85 with a 200tdi and a dry transfer case. I have a 1.2 LT230 laying around and was going to fit that unit to make the car mobile, but was wondering just how much the difference in ratio affects the performance?
I have 265/75 and 235/85 tires to choose from, standard diff ratio.

Thoughts?
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  #2  
Old January 14th, 2016, 03:45 PM
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I say go for it.

Those two tire circumference are almost identical but I think the 235's look kinda small...


Any hills in PA?


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Old January 14th, 2016, 03:47 PM
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Trevor let's see pics already!
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Old January 14th, 2016, 03:51 PM
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IMO, the 200tdi is best suited with a 1.4 tcase.
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  #5  
Old January 14th, 2016, 04:09 PM
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What gearbox does it have (specific serial number?). This can affect the choice of transfer case ratio. Also are you planning to adjust the boost and fueling?
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  #6  
Old January 14th, 2016, 04:22 PM
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Trevor Griffiths
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Any hills? Maybe a few here and there. Like, everywhere.

John, for as much Rover work I've had the opportunity to perform over the last 35 years, TDi's are fairly "new" to me. So yes, I'm going to play with boost and fuelling. Any advice right from the get go?

I'll wander over and find a serial number on the LT77.

I had an Ashcroft 1.4 here from a customer's 300tdi Disco 1. He felt it was too much rpm at highway speeds for him, so we fitted a 1.2 and I took the 1.4 as partial trade. It's now in my trail-biased Rangie with 4.10's and 33's. Runs 3k rpm at 70 MPH with a 3.9 and a 4HP22.
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  #7  
Old January 14th, 2016, 04:35 PM
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Quote:
Originally Posted by Roverlab View Post
Any advice right from the get go?
Get a boost gauge and an EGT gauge on it first. You can pretty much adjust the wastegate actuator to its shortest position from the get go as the turbo is not really able to produce too much boost... Then remove the boost diaphragm spacer/travel limit doohickey and rotate the pin to the higher fueling points until you don't like the smoke or you are unhappy with EGTs. Try and keep EGTs below 1300 F except for short periods. You can set it to never go above or you can manage it manually with the right foot. Test on long uphills where you can maintain full throttle for a good minute, if possible. Note that EGTs will vary with rpm as well. In my truck, they are highest around 3000 rpm, but I'm not sure this is the same for everyone.
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  #8  
Old January 14th, 2016, 05:02 PM
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Quote:
Originally Posted by Roverlab View Post
Picked up an '85 with a 200tdi and a dry transfer case. I have a 1.2 LT230 laying around and was going to fit that unit to make the car mobile, but was wondering just how much the difference in ratio affects the performance?
I have 265/75 and 235/85 tires to choose from, standard diff ratio.

Thoughts?
Should be fine with a 1.22.
You can install a manual boost controller and turn the fuel up enough to pull the PA hills.
Delighted that you joined "the diesel club".
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  #9  
Old January 14th, 2016, 05:25 PM
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Sorry for the lousy pix- my shop is, umm, an intimate facility, and there isn't much room to get away from the subjects......
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  #10  
Old January 14th, 2016, 05:28 PM
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Oh that's impressive. Sorry for my inability to rotate....
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  #11  
Old January 14th, 2016, 05:29 PM
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OOOOh, need to change my sig line....
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  #12  
Old January 14th, 2016, 05:34 PM
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Nice Trevor! With that 200, it's got some potential...you're the man to make that happen .
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  #13  
Old January 14th, 2016, 05:36 PM
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Love the patina.
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  #14  
Old January 14th, 2016, 05:37 PM
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Trevor Griffiths
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It looks grey, but it is actually green- look below the Front Runner fuel can mount on the right rear and you'll see a darker, shinier, flat green.....that was by hand with Meguiar's #6

------ Follow up post added January 14th, 2016 05:44 PM ------

John, the transmission is 56A0205685B
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  #15  
Old January 15th, 2016, 08:12 AM
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Quote:
Originally Posted by Red90 View Post
Get a boost gauge and an EGT gauge on it first. You can pretty much adjust the wastegate actuator to its shortest position from the get go as the turbo is not really able to produce too much boost... Then remove the boost diaphragm spacer/travel limit doohickey and rotate the pin to the higher fueling points until you don't like the smoke or you are unhappy with EGTs. Try and keep EGTs below 1300 F except for short periods. You can set it to never go above or you can manage it manually with the right foot. Test on long uphills where you can maintain full throttle for a good minute, if possible. Note that EGTs will vary with rpm as well. In my truck, they are highest around 3000 rpm, but I'm not sure this is the same for everyone.
Trevor, I see the mystery has gotten the best of you too. Ha! Good on Ya.

John, if one tunes their 200 for hills will the performance be poor around town? Just wondering if this is something we have to make decisions on based on what we primarily do the most. Maybe I misread your tuning advice. I hope so as I don't have hills to fret with 70% of the time.
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  #16  
Old January 15th, 2016, 08:44 AM
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Quote:
Originally Posted by 1of40 View Post
I hope so as I don't have hills to fret with 70% of the time.
Clay, I want to hear your first report when you take the Tdi up to WTG.
That long, steep climb to 3900' will have you staring at the EGT!



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  #17  
Old January 15th, 2016, 09:13 AM
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Tuning a tdi means you will see a bit more smoke but certainly not poor performance around town. By giving the engine the fuel it needs you typically end up flogging it less-ie you don't have to drive it so hard to get the same speeds. Your shifts are earlier due to more torque. If the engine is not tuned so that you can get to 1300 degrees on a pyrometer it has insufficient fueling.

Neat truck, congratulations Trevor.
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  #18  
Old January 15th, 2016, 10:03 AM
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Quote:
Originally Posted by 1of40 View Post
John, if one tunes their 200 for hills will the performance be poor around town? Just wondering if this is something we have to make decisions on based on what we primarily do the most. Maybe I misread your tuning advice. I hope so as I don't have hills to fret with 70% of the time.
As Doug says, a bit of smoke is the only downside. Otherwise, it will drive better everywhere.

Quote:
Originally Posted by Roverlab View Post
John, the transmission is 56A0205685B
Okay, so a 56A is the proper 200TDI gearbox. That is a good thing. I would stick with a 1.4 then. A 1.2 will be a bit long in 5th.

I'm a little confused on the "B" suffix though. It should be "H" or higher?? The LT77, 56A should be "H" and then the R380, 56A started at "J".
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  #19  
Old January 15th, 2016, 10:45 AM
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Could be an H- it was dark-ish and I didn't have my readers.....I'm going to put the 1.2 in as I have it handy and can start driving right away. Maybe the 1.4 will be rebuildable......
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  #20  
Old January 15th, 2016, 10:51 AM
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Cool. Let us know what you think of the 1.2 then. It is always a big debate....
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