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Go Back   TDIClub Forums > VW TDI Discussion Areas > TDI Power Enhancements

TDI Power Enhancements Discussions about increasing the power of your TDI engine. i.e. chips, injectors, powerboxes, clutches, etc. Handling, suspensions, wheels, type discussion should be put into the "Upgrades (non TDI Engine related)" forum. Non TDI vehicle related postings will be moved or removed. Please note the Performance Disclaimer.

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Old February 8th, 2019, 06:42   #1
duke21
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Default GTB1756vk in BV43 housing

I would only swap exhaust manifolds. So can i take BV43's exhaust housing from CR110/136/140/143 engines and fit GTB1756 core inside. Or if this does not work, can i take exhaust housing of GT1749vc?
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Old February 8th, 2019, 12:46   #2
adamss24
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Doesnt work... They are different manufacturers and design...
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Old February 9th, 2019, 11:42   #3
duke21
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Ok maybe mixing KKK housing and Garrett turbo doesnt work, but should 1749's housing with 1756...
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Old February 12th, 2019, 02:44   #4
shanky887614
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wouldnt work.

the gt1749 and the gtb's have completly different internals.


the gtbs have a nozzle cage that is what is machined to fit the exhaust housing.



the gt1749 exhaust housing is machined to fit the exhaust wheel

Sent from my ASUS_X00ID using Tapatalk
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Old February 12th, 2019, 03:22   #5
duke21
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Isnt GT1749VC 3rd gen VNT? So same as GTB1756...
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Old February 12th, 2019, 05:08   #6
Yucca
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I think GTB1756VK will bolt on to GT1749VC exhaust housing.
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Old February 12th, 2019, 18:31   #7
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I believe this has already been done by someone here...

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Old February 13th, 2019, 03:50   #8
duke21
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Thank you all. So not need for machining exh. housing to fit?
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Old February 13th, 2019, 08:06   #9
Bambaataa
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Image i posted is a 1756 in a 1749 exhaust manifold. I don't know of a BV43
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Old February 13th, 2019, 20:00   #10
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Gtb1749vc turbochargers are not easy to find, you better off with a gtb style log manifold made out of 3mm stainless steel bends...
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Old February 13th, 2019, 22:26   #11
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Maybe a bv43d would fit the bv43a/bv43b exhaust housing.
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Old February 14th, 2019, 01:03   #12
duke21
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I dont believe in custom made exhaust manifolds any more, that is the reason to try have stock one. Minimal chances for leaks and cracks...
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Old February 14th, 2019, 12:57   #13
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I think GTB1756VK fit also to GT(B)1646V manifold...

GT1749VC is 16V manifold so 1646V is way to go if you need 8V manifold.
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Old February 15th, 2019, 00:48   #14
duke21
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i suppose i cannot use BKD's gt1749va's exhaust housing on BMN engine (turbo positioned up side). Bolt pattern seems ok...
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Old February 15th, 2019, 11:40   #15
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No, wont work. Bolt pattern is asymetric, so you cant flip around.

If you have BMN engine, you have GT1749VC turbo which is Gen 3 VNT with seperate nozzle cage like on GT1756VK.

Bad thing about it: You cant use the 1756VK because the VNT lever arm is on the wrong side, so you would need to swap over all the 1756 internals to the 1749 CHRA and have the turbo balanced and afterwards VNT calibrated.

Aslo the 1756 is not the biggest possible GTB17 turbine.

But on the other hand, those BMN engines are not the best for tuning anyway. Way to much problems with Siemens PPD injectors...
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Last edited by majesty78; February 15th, 2019 at 11:46.
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