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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 October 2nd, 2006, 20:46   #1
david_594
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Default GT1749VA versus GT1749VB?

So anyone found the differences between these 2 turbos? They are both vnt17's, but slightly different at the same time.

I was trying to find out more about my 17 and came across a finnish wiki with a little bit of info and turbine sizes http://www.autowiki.fi/index.php/VAG_dieselturbot


VNT-15 and GT1749V malleissa 33,5 mm intake and 36,5 mm flight

Garrett GT1749VA, 35 mm intake and 36,5 mm flight

Garrett GT1749VB, 37 mm intake and 38,3 mm flight

So the VA has a slighly bigger wheel on the compressor side as compared to the vnt15. The VB has both a bigger compressor and exhaust wheel so it should flow better on the exhaust side compared to the VA? The VA should spool a little faster than the VB though correct?

Anyone have any thoughts on this or more info?
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Old October 2nd, 2006, 20:55   #2
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david,

from talk with jeff on my vnt turbo issues it looks like the va model is indeed faster spool up. the only problem is the intake wheel is not ment to go over a set psi range. 18+ The VB is designed to support higher boost levels. this is great info btw. now all we need to do is post vnt 20 info in this post and what a great turbo info page!
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Old October 3rd, 2006, 07:37   #3
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The va is in the 130 pd stock running 19 psi. they are fine into the low 20psi range. 25 is a streatch
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Old October 3rd, 2006, 12:39   #4
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thanks for the correction on that. all this talk of turbos makes my head spin
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Old October 3rd, 2006, 12:39   #5
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thanks for the correction on that. all this talk of turbos makes my head spin
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Old October 4th, 2006, 06:16   #6
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Ok, I've got a VNT-17 here now. I know the link on wikipedia says that the PD 130 and PD 140 share the same turbo and all VA's are the same right? I'm a bit confised as to the VA, VB, VM and such though. I really have and what can it support for boost? Another link I found is equally confusing and the magic pdf link has expired... http://www.seatcupra.net/forums/showthread.php?t=93280

*edited because I can read now

Found this interesting chart out here too http://www.honeywell.com/sites/servl...22GTB1749VM%22

I am trying to get to the bottom of this because when I purchsed this turbo I was told there would be no physical difference between it and the PD150 turbo (just that the suffix were for the different applications) I guess I took that line ha. That isn't looking to be the case if it is the same as the pd130 turbo now is it? I don't want to muddy names but I would like some sort of confirmation before I confront the vendor and ask for compensation.

Just measured the compressor wheel and it is 35mm has anyone actually measured the compressor wheel of the VNT-17VB here and give me 100% proof that the number on the wikipedia link are correct or not?
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Old January 25th, 2007, 22:49   #7
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That text in Wikipedia is mine, the measurement's are done by me so I'd have to say they are correct . I have lot's of grease on my hands from these particular turbo models .
The text is valid for Golf IV generation cars (all VAG).

Golf V family is another story, but if a particular turbo has the markings -VA or -VB I'd stick with the measurements above.
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Old January 26th, 2007, 05:11   #8
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Quote:
Originally Posted by TDIfreak
That text in Wikipedia is mine, the measurement's are done by me so I'd have to say they are correct . I have lot's of grease on my hands from these particular turbo models .
The text is valid for Golf IV generation cars (all VAG).

Golf V family is another story, but if a particular turbo has the markings -VA or -VB I'd stick with the measurements above.
Physically on the outside both turbos look identicle, difference is all internal. TDIfreak what other differences are there in the turbo? Is it just the wheel diameters?
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Old January 26th, 2007, 05:20   #9
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I think inducers and exducers also slightly different sizes.
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Old January 26th, 2007, 05:47   #10
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There are both VA and VB turbos with different kind of compressor housing outlets depending on which vehicle its meant for.
The wheels are as mentioned above. Differences only in comp inlet and turbine outlet.
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Old January 26th, 2007, 07:13   #11
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The PD130 and PD150 Golf both look identicle on the outside. they have same housings, the only way to tell is the VA or the VB will be stamped on it. The PD130 Passat has a different housing because of different turbo hosing positions etc.
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Old January 26th, 2007, 08:09   #12
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Not the only way, look at the inducer diameter.
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Old January 26th, 2007, 08:31   #13
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What part is the inducer?
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Old January 26th, 2007, 13:53   #14
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^Yes when they are bolted on, both VA and VB look exactly the same on a Golf IV.
But if you take the turbo intake pipe off, the diameter of the compressor inlet (=inducer) is bigger in VB.
Same way, turbine outlet or exducer is bigger in VB.
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Old January 26th, 2007, 17:38   #15
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Quote:
Originally Posted by TDIfreak
^Yes when they are bolted on, both VA and VB look exactly the same on a Golf IV.
But if you take the turbo intake pipe off, the diameter of the compressor inlet (=inducer) is bigger in VB.
Same way, turbine outlet or exducer is bigger in VB.
Doesn't make sense because the hose for the inducer and exducer that fits is the same part for both turbos
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