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Old April 13th, 2014, 02:23 AM
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Wolf Fabrication
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Sterling Archer
'93 NAS110 #463
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Are VNT Kits Worth the Expense?


Strictly tied to the 300tdi, are the available VNT kits worth the expense? It appears based on the data that the only gain is 6hp (111hp to 117hp - 5%), but the real gain comes with an upgraded injection pump and intercooler - a jump of 26hp over stock (111hp to 137hp) - a 19% increase.

The bigger gain comes in the increase in torque at a lower RPM - 29ftlbs over stock (195@1800rpm to 224@1400). Add the upgraded IP and IC and it jumps to 60ftlbs over stock (255@1400rpm).

So I guess my point is, it doesn't seem the kit is worth the expense unless you upgrade your IP and IC as well.


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Wolf Fabrication
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Old April 13th, 2014, 03:17 AM
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Mike Hammond
110 200Tdi and a 2005 Scorpa SY250
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Interesting figures. IF the turbo was shot then it's a good choice.

Mike Hammond
Diesels.....great when they're going and so easy to work on.
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Old April 13th, 2014, 04:36 AM
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Jamie Austin
1992 110 Td5 CSW & 1989 MB G-Wagen
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I have a VNT (or VGT or whatever it's called) on my Td5.

I had it with an ECU remap, so power gains were there, but it did make driveability much nicer, smoother torque curve, instead of "on" or "off" power, which seems to be amplified by having a remap or FiP tweeked.... you get good power when it's all on song, at 2000+ rpm's, but bugger all below it.
The VNT helps with that.
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Old April 13th, 2014, 06:21 AM
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What he said; it's the broader power band, it does increase top HP but the turbo spools at lower rpms
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Old April 13th, 2014, 07:17 AM
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Torque is good. More better. Unless it stresses out the box.
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Old April 13th, 2014, 08:19 AM
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John B.
1991 Defender 90, 200TDI
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It is all about torque at lower rpm and nothing else. It basically gets rid of most of the turbo lag.

If you want more peak power, that is available for free at the injection pump. You don't need an intercooler or anything. Just adjust some settings.
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Old April 13th, 2014, 08:48 AM
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Jason Rose
1983 110 County 200tdi
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I had a VNT turbo on my 300tdi D1. The turbo made a huge difference off the line. Of course, I had the auto box, and anything that helped it off the line was an improvement.

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