turbo upgrade for A3?

[Rub87]

Soon, i will be able to report back on the vnt swap and power in the MK3 platform. I have a mild ported rebuild head at Chill's and a vnt17vb on the way. I plan to use PP502 or 764 with an RC tune (undecided). I want to see if i can break the 150whp barrier in the mk3.

should be no problem with that turbo, if you can get the fuel in..

 

[Stealth TDI]

Hello,

Are there any follow-ups from those who have been planning VNT conversions or those developing an inventory of modified rear engine mounts?

Thanks,

Scott

 

[IndigoBlueWagon]

Want one? I've got the mounts here and could have one modified in a couple of days. I may put a VNT-15 in my A3 yet. I'm just enjoying it too much with Bosch .205s and a stock tune right now. It's my retro-mobile.

 

[Stealth TDI]

Peter,

Yes, I'm interested in an engine mount. Think of it as an "if you build it, they will come" sort of thing. My lack of a modified engine mount is one of the many things keeping me from considering a VNT conversion. If I toss in a modified mount now, maybe I won't hestitate to install a VNT months down the road.

Please PM me details such as price, core, etc. Perhaps I can pick it up when I visit in a couple of weeks.

 

[IndigoBlueWagon]

So be it. I'll get a couple of modified and put them on the site.

 

[jsrmonster]

So be it. I'll get a couple of modified and put them on the site.

Awesome! ;-)

 

[mojogoes]

Soon, i will be able to report back on the vnt swap and power in the MK3 platform. I have a mild ported rebuild head at Chill's and a vnt17vb on the way. I plan to use PP502 or 764 with an RC tune (undecided). I want to see if i can break the 150whp barrier in the mk3.

If your using a 11mm ip / lift pump / fuel cooler you shouldn't have a problem in making 150whp with the vb






Sorry i didn't see the other replies mentioning these mods!!

 

[numbnuts]

would it be much more difficult fitting a gt2256 or so on a mk3 if going down the vnt route?

 

[Rub87]

Don't think so, this is with AFN mani and adapterplate, turbo is 2260v

 

[numbnuts]

Now thats a turbo is there enough room in the mk3 bay?

 

[Rub87]

yes, room enough..

 

[numbnuts]

Anyone running this on an mk3?

 

[Rub87]

I am yes

 

[numbnuts]

anymore details and specs and pics on it?

 

[quietmission]

I have my RC tuned ecu, ported head, peter's A3 downpipe at Mrchill's for this conversion. I have a vnt17vb ready to go in but Chris told that it would be a lot of work to fit it in my a3 golf.
I was only missing the rear modified mount and i would be glad to pick it up from you Peter if you have it available.

 

[mojogoes]

Numbnuts you have PM!!

 

[cog]

i was gonna say you havent seen mojogoes mad mk3 yet get saving

 

[12MPGHWY]

Any update on the modified mount?

Anyone have pictures that show how the mount interferes and or what the modified mount looks like

 

[Rub87]

usually the compressor housing inlet touches the mount, using an afn manifold places the turbo further backwards and reduces the need to modify the mount, a modified mount is with a U section cut out and then reinforced somewhere, I never did this myself, but in portugal etc many people run a 1749vb on mk3 cars..

 

[1point9turbo]

interested in this too... lookin to re-attack turbo swap plan soon.

 

[hendomatic]

I am also very interested in the VNT swap from the KKK turbo. Just finished a successful rebuild of the AHU motor and the turbo is starting to sound like the next thing to replace. I have been thrashing the poor thing with an RC3+ tune around 21 psi and its has caused grin wrinkles, but I know I'm operating that poor stock turbo really outside its safe window.

So what is to be done to get into VNT tech on the AHU?

Thanks

 

[IndigoBlueWagon]

Someone ventured that this might just bolt up to the A3 manifold with a minor flange adapter.

I think the stock IP might not be enough, but mrchill suggested I put one on my Passat.

 

[jsrmonster]

Converting an A3 from wastegate to vnt requires an ecu firmware upgrade to AFN110 (vnt), and rear motor mount modification, A4 downpipe, and inlet piping mods (turbo moves over a few inches to passenger side). You'll also need an A4 n75 from 99.5, and few other tweaks, like stretching oil line, and A4 oil return line from 99.5.

I have done several of these and they run very nice, with very fast spooling, and good torque. Here is a dyno of my boy's car with 10mm, pp520's and vnt1749vb (all else stock except clutch). http://ascension.globat.com/~rocketchip.com/coppermine/albums/userpics/10001/Jeffs_A3_1749_pp520_RC4_10mm.gif

Here are some pics:

modified rear mount

Side view:

Top view:

Here is the AFN110 2-piece manifold (not sold in USA) that can also be used, but requires a custom downpipe or AFN downpipe.

 

[Rub87]

Also a solution =)

 

[jsrmonster]

This one look interesting too ;-)

http://forums.tdiclub.com/showpost.php?p=1647430&postcount=7

 

[Rub87]

is that a AAZ manifold upside down.. should require gridning the ports in the manifold more to one side to make them line up, 2-3mm should be sufficient

 

[hendomatic]

Converting an A3 from wastegate to vnt requires an ecu firmware upgrade to AFN110 (vnt), and rear motor mount modification, A4 downpipe, and inlet piping mods (turbo moves over a few inches to passenger side). You'll also need an A4 n75 from 99.5, and few other tweaks, like stretching oil line, and A4 oil return line from 99.5.

I have done several of these and they run very nice, with very fast spooling, and good torque. Here is a dyno of my boy's car with 10mm, pp520's and vnt1749vb (all else stock except clutch). http://ascension.globat.com/~rocketchip.com/coppermine/albums/userpics/10001/Jeffs_A3_1749_pp520_RC4_10mm.gif

Here are some pics:

modified rear mount

Side view:

Top view:

Here is the AFN110 2-piece manifold (not sold in USA) that can also be used, but requires a custom downpipe or AFN downpipe.

Thanks Jeff for the great pics. That mod looks very interesting. Where would one go about getting things like AFN manifolds and that turbo?

I assume that firmware upgrade is available like the regular tunes or does it require an ECU swap or mod?

How about just a stock Mk4 vnt15 or something a little hotter that one could find in the US?

Sorry for newbness on this topic, but I just dont know the googlisms to track this stuff down.

Thanks for taking the time to respond.

 

[Rub87]

use gt1749va from audi/passat and afn manifold =) easy to source in europe..

VB is always one piece with manifold : not good

option is borg warner gt1749VC equivalent found on 16v 170hp PD in audi A4, bolts up perfectly to afn manifold..

 

[G60ING]

the stock VNt15 or a VNT 17 will also fit with the same modifcations as shown in the first few pics. I did this on my dzsl slc with an 1852 turbo...boy was it fun before I sold her.

 

[hendomatic]

the stock VNt15 or a VNT 17 will also fit with the same modifcations as shown in the first few pics. I did this on my dzsl slc with an 1852 turbo...boy was it fun before I sold her.

But is that what they call the VB or one piece mannie? I couldnt figure out what VB stood for....

I think at this time, that would also be a good option to consider.

I dont have an EMP sensor hooked up but I can sense that the max flow thru the stock KKK turbo hot side is probably what is holding things back. Its interesting to watch the boost stay around 20 and when the RPMs hit around 3500, the exhaust starts to get more smoky and that feeling of butt-dyno satisfaction starts to fade. I can imagine the back pressure simply building to the point where its affecting the ability of the engine to get rid of the exhaust.

Of course, I could be missing the boat. I do have the timing set to match what the RC3+ tune is calling for at that rpm and load.

Thanks