OM606 Turbo Selection for Truck application

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05-12-2020, 08:40 PM #10

(05-07-2020, 09:39 AM)jav1 Hi Brian-

Hey thanks for your original thread... it was likely the single largest factor in my decision to embark on my conversion. Your work and documentation along the way were truly inspirational.

If I could just add another perspective... I have a newer geometry VNT turbo on my OM606 w/DSL1 conversion. I have the GT2056V off a 2008 E320CDI. I believe mine has the updated vane geometry and it originally had the electronic vane controller- although I converted it to the vacuum actuator since Baldur didn't have the electronic controls worked out at the time.

I'm generally pretty happy with the turbo. It spools up extremely quickly and can easily produce more than 30 PSI of boost. My complaint, which might not be a factor for you, is that the exhaust side is a bit too restrictive at RPM levels the OM606 should easily tolerate. I understand from your other post that you typically stay under 4000 RPM. At that exhaust volume, the 2056V may be a perfect fit. In my case, my OEM automatic transmission controller wants to shift at 4800 RPM (@ WOT). And, while the OM606 can handle that RPM, this smaller turbo's exhaust side creates enough back pressure that the OM606 valves begin to "float" , before reaching my shift points. My exhaust is essentially a full 3" with very little back pressure- so I'm quite certain the restriction is the 2056V exhaust housing. And, in addition to back pressure, I also believe the restrictive exhaust housing flow is contributing to higher EGT's than I'd like. I tow heavy quite a bit so both of these factors are a concern for me... but may not be an issue for you where your main goal is quick efficient spool-up at low RPM.

I have since purchased a GT2359V from an OM613 which I plan to install but haven't gotten to. I'm pretty sure the 2359V will do 3 things. I'm pretty sure it will spool up a little bit slower, which I'm fine with... but I'm really hopeful that it will cure the valve float and high EGT problems. One thing is certain though. I don't regret going to VNT vs staying with a conventional turbo. IMHO- I doubt you'll get the same response down low AND flow up high from a conventional turbo as you would from a VNT.... but I'm far from being an expert.

Jav,

thanks for the kind words, glad my struggles helped someone, and thanks for returning the favor on your turbo experience. I've actually been going through a bunch of the tdi forums and they've led me to researching the GTB2056 and GTB2260vk as options so I'm glad to hear your experience with the 2056. It may be hard to do a direct comparison unless you can lock up your torque converter, but how low in the rpm range is it able to build >10psi of boost? Also do you have a build thread? i'd love to see how you mounted it up, there are so many variations of these gtb turbos for different OEMs I'm still trying to make sense of what model would mount up with the least hassle.

Did you consider the GTB2260vk at all? I know the gt2359v seems to be a tried and true upgrade over the oe kkk, but I can't help but think the newer gtb tech would perform better.

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