GT1749VA versus GT1749VB?

david_594

Top Post Dawg
Joined
Feb 28, 2004
Location
Cheshire, CT
TDI
2000 Jetta GLS Silver
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?
 

shortysclimbin

Veteran Member
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Oct 15, 2004
Location
Virginia currently
TDI
Kubvan, mk2 golf, mk6 golf
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!
 

Slave2school

Top Post Dawg
Joined
Mar 20, 2004
Location
Angus, Ontario
TDI
99.5 used to at least...
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 :D

Found this interesting chart out here too http://www.honeywell.com/sites/servlet/com.merx.npoint.servlets.DocumentServlet?docid=D51D560CA-EE41-8E59-3C6E-970F8C24584F#search=%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 :mad: 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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TDIfreak

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Sep 29, 2001
Location
Finland
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Multivan AHY, Golf CFFB DSG, A6Q 4F 2.7 TDI CANC, 7 meter boat with ALH.
That text in Wikipedia is mine, the measurement's are done by me so I'd have to say they are correct :D . 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.
 

mickyTDI

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Sep 21, 2003
Location
Longford, Ireland
TDIfreak said:
That text in Wikipedia is mine, the measurement's are done by me so I'd have to say they are correct :D . 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?
 

TDIfreak

Veteran Member
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Location
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Multivan AHY, Golf CFFB DSG, A6Q 4F 2.7 TDI CANC, 7 meter boat with ALH.
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.
 

mickyTDI

Veteran Member
Joined
Sep 21, 2003
Location
Longford, Ireland
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.
 

KERMA

Vendor , w/Business number
Joined
Sep 23, 2001
Location
here
TDI
99 beetle and 04 jetta
Not the only way, look at the inducer diameter.
 

TDIfreak

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Location
Finland
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Multivan AHY, Golf CFFB DSG, A6Q 4F 2.7 TDI CANC, 7 meter boat with ALH.
^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.
 

mickyTDI

Veteran Member
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Sep 21, 2003
Location
Longford, Ireland
TDIfreak said:
^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:confused:
 

Nitrowolf

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Kansas City
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White 2003 Jetta TDI
As I recall, the VA wheel is made from... umm aluminum was it? and the VB was made out of titatium... thus allowing the higher boost pressures.

Max safe pressure for a VB is around 23PSI I think... but I've heard of them being pushed to 30 without them blowing up. I have no first hand experience with 30PSI though. Mine spikes to about 26 regularly without apparent issue.
 

TDIfreak

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Multivan AHY, Golf CFFB DSG, A6Q 4F 2.7 TDI CANC, 7 meter boat with ALH.
mickyTDI said:
Doesn't make sense because the hose for the inducer and exducer that fits is the same part for both turbos:confused:
If you think of a turbomachine you find that the INSIDE diameter of the intake is what counts. I hope this clears things up and I'm sure your turbobuilder will show things in practise.
 

mickyTDI

Veteran Member
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Sep 21, 2003
Location
Longford, Ireland
TDIfreak said:
If you think of a turbomachine you find that the INSIDE diameter of the intake is what counts. I hope this clears things up and I'm sure your turbobuilder will show things in practise.
Ah i see, so where the intake pipe that fits over the inducer on the 130 will be thicker than on the 150 turbo becasue it would be machined out more?
The exducer exit has to be the same though because the hose has to fit in a clip.
 

KERMA

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here
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99 beetle and 04 jetta
Nitrowolf said:
As I recall, the VA wheel is made from... umm aluminum was it? and the VB was made out of titatium... thus allowing the higher boost pressures.

Max safe pressure for a VB is around 23PSI I think... but I've heard of them being pushed to 30 without them blowing up. I have no first hand experience with 30PSI though. Mine spikes to about 26 regularly without apparent issue.
I know from first hand experience that a vnt-17 doesn't like 30 psi at all. First time I tried 30 psi with a vnt-17, it gave up the ghost immediately.
IMO 23 psi is about the absolute limit for a vnt-17, and then only in the midrange, cut it back to 21 psi at high rpm. If you want your turbo to last a while...
 

Nitrowolf

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Thanks for the info Kerma... I'll have to check where mine throttles back to psi wise at high rpms... I think it kicks back to about 21 psi.

What RPM range should it start dropping back the pressure?
 

KERMA

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Location
here
TDI
99 beetle and 04 jetta
I'll have to see if I can find the compressor maps again.
 

joevat

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TDI PD
shortysclimbin said:
now all we need to do is post vnt 20 info in this post
ok i'll donate mine. vnt20 st3 turbo. MAN OH MAN does this thing ever spool like a bad Mutha F'er.
people who claim that the 20 doesnt spool fast just aint getting it. its not in the turbo, its in the tuning. and alligator knows how to set these things.:cool:
 

SRHeer

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Sep 26, 2007
Location
Houston, Texas USA
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1999.5 Golf - 2001 Beetle
GT1749s

Hey TDImen,

I am learning a bit about turbos here so be patient any feedback is appreciated!

I am building up a mTDI AHU 98 Mk3 Jetta engine to put into like a 91 Mk2 Jetta.

My question is will the GT1749VB fit onto the Jetta exhaust and intake manifolds without modification? And or what is the largest turbo or turbos out there that I can fit onto the AHU without having to modify much?

Right now I have a 2.0L Land Rover pump with an 11m/head - and .216 Firad nozzles - so I am thinking that putting on the GT1749VB verses the VA will be an added benefit in that does it not spool a bit later and handle more boost in a higher part of rpm range than the GT1749VA? Is this technically correct?

Any suggestions are welcome!
Any one have or know of a VB or equivalent FS?
Stephen
 
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cog

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Feb 6, 2008
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MIDDLESBROUGH... U.K
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98 GT.TDI 11O
aprt from moving the peak boost slighty further up the rev range i noticed very little difference between stock vnt15 spool up and vnt 17vb . the vb is still a very responsive turbo.
do not get worried about spool up time with the vb its not an issue ;)
 

bhodgkiss

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Sep 11, 2006
Location
Banbury, UK
TDI
AFN Passat Wagon
So what fouls on the Passat longitudinal AFN engine when attempting to mount a VB with integral manifold please? Does it simply not fit? Is the turbo clocked differenty?
 

JFettig

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Aug 18, 2010
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B5 Passat, 2010 Jetta

cog

Veteran Member
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Feb 6, 2008
Location
MIDDLESBROUGH... U.K
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98 GT.TDI 11O
correct the vb holds more boost due to its titanium compressor in fact it can hold 25-26 psi but theres not much point going over 24 psi due to high exhaust manifold presures just cancelling out any performance from more boost.
so
va turbo max 21-22 psi
vb turbo max (efficient)24 psi

oh and by the way when they say the inducer is smaller on the va there not talking about the turbo outlet that you attch the pipe to as this is the same . there talking about the the inducer wheel inside the housing that is smaller on the va
 
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bhodgkiss

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Location
Banbury, UK
TDI
AFN Passat Wagon
is it possible to clock a vb turbo differently so it works on an AFN?
With clocking its just the relative angular orientation of inlet to outlet sides, and this can be set to any angle? Or not?
 
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