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  #21  
Old September 21st, 2016, 02:35 PM
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My impression reading the Op's symptoms- you can't make adequate boost without adequate fueling, the two are tied to one another. I'd wager this engine is running lean. A lean diesel is slow to spin up and as such doesn't make good boost. If you can't make adequate boost lower IAT is going to help how ?
Unfortunately, you need a pyrometer to tune these engines.

Sounds like it is also running on the cold side.
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  #22  
Old September 21st, 2016, 02:36 PM
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Quote:
Originally Posted by steinhnj View Post
With a disco 200Tdi, exMOD LT77 and a 1.2 TC I run 70@2500RPM.

You can plug in your tranny and TC serial numbers into the Ashcroft website and it will tell you exactly what you have.

If it's a digital gage, you should be able to program it pretty easily. I run an Auber meter that was in C and Pa for temp and pressure by default. I thought I had a bad thermocouple initially. It also had an option for what type of thermocouple is was running. In my case it was a K type but was selectable on the meter.
I bought both FROM ashcroft.

My gauge is not a commercial gauge. It's a gauge I made. Which means that programmed my conversion factor based on linear response between 32 F and 212 F, which means that it is likely there is an error as I'm extrapolating way beyond the range I measured.



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  #23  
Old September 21st, 2016, 03:03 PM
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We just need to start a 200tdi / 300tdi dyno thread. The way that we talk about performance on these trucks is way too subjective.
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  #24  
Old September 21st, 2016, 03:11 PM
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At least post up top speed and 0-60 times.
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  #25  
Old September 21st, 2016, 03:13 PM
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Yes, but once you have cooled the air close to ambient, a larger heat exchanger does not cool it any further. A heat exchanger can only have a certain approach temperature (the difference between the ambient and the turbo outlet). Once the approach is small, more surface area does very little.

Gotcha. So ,on a really cold day ,you should see a difference because the parameters are farther apart?
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  #26  
Old September 21st, 2016, 04:00 PM
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Quote:
Originally Posted by sonoronos View Post
We just need to start a 200tdi / 300tdi dyno thread. The way that we talk about performance on these trucks is way too subjective.
Temperature is a great indicator. Typically if you can't get to 1250-1300 f (pyrometer reading pre-turbo) on a long grade, 5th gear, with your foot in it, you have untapped power available to you as you are under fueled.

There are so many different possible combinations of engine, tire size, tire pressure, t case ratio, weight of the truck, roof rack/aero dynamic, etc issues, it makes apples to apples comparisons tough.
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  #27  
Old September 21st, 2016, 04:01 PM
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Quote:
Originally Posted by Uncle Douglas View Post
My impression reading the Op's symptoms- you can't make adequate boost without adequate fueling, the two are tied to one another. I'd wager this engine is running lean. A lean diesel is slow to spin up and as such doesn't make good boost. If you can't make adequate boost lower IAT is going to help how ?
Unfortunately, you need a pyrometer to tune these engines.

Sounds like it is also running on the cold side.
Interesting. I do have a boost gauge and it reads up to 10-12 psi boost.
I'll get a vdo pyro gauge and do more measurements next weekend and post results.

Would be great to have some more data from people. Maybe I'll start a new thread with a spreadsheet and ask for people to input their numbers.

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  #28  
Old September 21st, 2016, 04:07 PM
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Quote:
Originally Posted by Azarur View Post
I replaced the lt77 with the r380 and it's mated to the lt230 xfer box.
What's the LT230 gearing?
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  #29  
Old September 21st, 2016, 04:09 PM
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Quote:
Originally Posted by rdavisinva View Post
What's the LT230 gearing?
Pretty sure it's 1.4.

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  #30  
Old September 21st, 2016, 04:28 PM
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Quote:
Originally Posted by Azarur View Post
Pretty sure it's 1.4.

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To be certain, the number on the T-case can be decoded on the Ashcroft site.
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  #31  
Old September 21st, 2016, 04:32 PM
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Quote:
Originally Posted by Red90 View Post
The problem in this community is that there is very little real scientific testing. Every other auto enthusiast group tests the shit out of every mod, but here it is all seat of the pants.
I hear you loud and clear. Seems to me it would be pretty easy to get some numbers and figure it out though. Lots of folks out there with 200s and 300s that can help is populate a data set.

I admit, my numbers are not accurate or precise at this point (my speedo is aftermarket and my calibration may be off, same goes for my egt. Tach is accurate tho) but I'm working to get it better. I will start putting a spreadsheet together with 0-30, 0-60, 1/4 mile, speed vs. Rpm at different gears, rpm vs egt, coolant temperature, etc. Would be great to have a bunch of people do the same.

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------ Follow up post added September 21st, 2016 02:34 PM ------

Quote:
Originally Posted by rdavisinva View Post
To be certain, the number on the T-case can be decoded on the Ashcroft site.
I got the tcase from them when I got the tranny. I'll check, but I'm 99.9% it's the 1.4.

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