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  #1  
Old 04-20-2013, 08:53 AM
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is a bigger than stock turbo on 617 possible?

Is a bigger than stock turbo on 617 possible? Just wondering if there is a bigger turbo out there that will bolt right up to my 300d om617.
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  #2  
Old 04-20-2013, 02:51 PM
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Turbo Information Thread (Needs your contributions!)
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  #3  
Old 04-21-2013, 08:45 PM
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I don't think anything will bolt on, but you could have the turbo rebuilt with a larger conpressor housing
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Old 05-02-2013, 09:17 AM
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Garrett GT28 is available in a T3 housing from Tial I think that is bolt on and bigger. Much more modern design that will help, you WILL need an intercooler and fueling upgrades to bother.
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Old 05-02-2013, 10:24 AM
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Generally

the larger the turbine wheel, the more turbo lag on acceleration. Although ultimate power may be greater, the car can end up less driveable satisfaction-wise. I don't think you can improve on the engineering that Benz has expended.
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  #6  
Old 05-02-2013, 11:03 PM
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Quote:
Originally Posted by rocky raccoon View Post
the larger the turbine wheel, the more turbo lag on acceleration. Although ultimate power may be greater, the car can end up less driveable satisfaction-wise. I don't think you can improve on the engineering that Benz has expended.
VGT/VNT options, while more complicated, are far more advanced than the 100year old technoloy in the T3 and certainly would be an improvement. Enough to warrant the work for a daily driver? For the hacker only maybe.
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Old 05-03-2013, 01:54 AM
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Originally Posted by rocky raccoon View Post
I don't think you can improve on the engineering that Benz has expended.
Lulz
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Old 05-03-2013, 09:10 AM
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Originally Posted by rocky raccoon View Post
the larger the turbine wheel, the more turbo lag on acceleration. Although ultimate power may be greater, the car can end up less driveable satisfaction-wise. I don't think you can improve on the engineering that Benz has expended.
In 1980 maybe. Remember, these cars were designed in the 70s. We have come a long way since then.


Did I get a return on my investment swapping to a VNT? No way, I don't drive enough for the .75-1mpg to matter. But it was fun to have instant boost
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Old 05-03-2013, 03:49 PM
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unfortunately there are no bolt on vnt's available that I'm aware of, otherwise I would be all over that
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1982 300D Turbodiesel, daily driver. Mods so far: Fram 8038 paper filter, 4 brake light mod, Gen II w126 (front) rotors/calipers, boost turned up to 12lbs, non-egr manifolds, water/methanol injection, 4-speed manual
1980 300SD Turbodiesel, project car, nearly ready to hit the street

1974 240D, New paint
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Old 05-03-2013, 06:02 PM
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Originally Posted by sassparilla_kid View Post
unfortunately there are no bolt on vnt's available that I'm aware of, otherwise I would be all over that
There are plenty of bolt on vnts if you dont mind hassling with the turbo and oil.
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  #11  
Old 05-03-2013, 08:28 PM
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They come with a .42/.48 T3 turbo, which is the smallest variant of the T3 on both the hot and cold sides. Lots of other turbos out there share the T3 flange and are larger in either the hot side, cold side, or both. As pointed out bigger isn't always better. You want to size a turbo to be efficient at the pressure ratio and CFM you intend to operate it.

FWIW, I use the .42/.48 on my 3L gasser. It'll boost 18-19 PSI at just under 3K RPM and make gobs of torque. It runs out of steam by 5K RPM, but since I value low RPM torque over high RPM horsepower its perfect for my combo.
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Old 05-06-2013, 03:56 PM
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I'm thinking a t3/t4 hybrid with ceramic ball bearings would be pretty sweet

T3/TO4B Turbochargers | www.TurboneticsInc.com - Boosting Since 1978 | turbochargers, intercoolers, wastegates, blow-off valves, controls, boosting systems, turbo kits, forced induction parts & accessories
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1982 300D Turbodiesel, daily driver. Mods so far: Fram 8038 paper filter, 4 brake light mod, Gen II w126 (front) rotors/calipers, boost turned up to 12lbs, non-egr manifolds, water/methanol injection, 4-speed manual
1980 300SD Turbodiesel, project car, nearly ready to hit the street

1974 240D, New paint
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  #13  
Old 05-07-2013, 08:44 AM
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You need to decide what you mean by bolt on.

There are plenty of turbos that share the same flange as the turbo on your car and will "bolt up"

But a turbo that will bolt to the stock oil lines, and connect perfectly to the proprietary intake manifold connection on the 617. There really isn't one.

And if you're "bolting" a bigger turbo up you haven't added any additional fuel, nor any additional cooling so you've wasted time and money. You'll have a shiny turbo on your motor not doing anything but lagging.

In my opinion be sure you're car is tuned within an inch of its life before worrying about a bigger turbo. If your valves are out of adjustment, your tank strainer is clogged, and your injection pump is timed wrong a giant turbo on stock delivery valves will fix none of that.
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  #14  
Old 05-15-2013, 02:28 PM
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Quote:
Originally Posted by winmutt View Post
There are plenty of bolt on vnts if you dont mind hassling with the turbo and oil.
No there aren't. Nearly all use a manifold flange design proprietary to the OEM application. VW uses T2 flange on some engine models, but thats as close as any get.
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  #15  
Old 05-15-2013, 02:29 PM
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Quote:
Originally Posted by duxthe1 View Post
They come with a .42/.48 T3 turbo, which is the smallest variant of the T3 on both the hot and cold sides.
Actually .36 is the smallest on the turbine and these engines use a T3-45, there is a T3-40 with a smaller compressor.
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