Ok: After four month daily use I can say that it is a perfect combination .
The driveabillity from in the lower rpm range is realy so much improved that the it feels like a modern engine. Above 3000 rpm I had to slowdown the Vnt turbo due the lack of fuel. So more power at the high rpm’s can be obtaind with a fuel pump with a higher range.
I measured the exhaust temperature and it never gets to high.
What did I gain :
1 more horse power
2 more torque at the low rpms
3 less black smoke.
4 Less fuel consumption
Downside :
It take’s some effort and money .
At first I removed the rack limiter from the original pump to gain 10% extra output.
In 2021 upgraded the pump to a Dieselmeken 7.5mm modified one .
and yes the preformance is improved in the hole rpm range and specially above 3000 rpm
At the moment there are some cars live on the road with the VNT garrett GT2256V turbo on a OM617. My car is in daily use and I monitor different readings under different conditions.With some calculations from Garrett I came to the GT2256V as best fit .At first injection came from the original MV injection pump without the rack limiter to get the maximum amount of diesel out of this pump. The timing had to be changed to 26ºbdc. Now its running with a Dieselmeken 7.5mm modified one.
This is a picture of the Agens-bv VNT OM617 turbo kit + with a Dieselmeken 7.5mm injection pump applied into Bjorn’s Mercedes G during the Super Karpata Trophy 2022 . 
First time up and running . 20 nov 2020:
A water cooled intercooler
Measuring :Boost pressure ,exhaust pressure and exhaust temperature.
Controller : The Arduino controller is limiting the exhaust pressure and temperature and egp/boost ratio
and contols the VNT with a vacuum valve .
The result is astonishing : The engine has a lot of torque starting from 1000 rpm . up to 4000 rpm .
The modern turbo changes the old engine in old engine with a modern feeling .
Next thing to do is to run it on a dyno and see how much it is improved
