What Turbo For R32 engine

[maRS2]

I have a VW T5 V6 4motion as work car.

So it is same engine as the GOLF R32 the V6 3.2 24Valve.
I would like to get more torque so I was thinking if a turbo but I'm not so good with those turbo flow map.

I would like to get 0,5 bar from as low as possible ( maybe 2000RPM) untill 7500 rpm.
what turbo would do that?

GT3071R?
I'm very intrest by a holset turbo because they are cheap. Wich one would be good for that.

Thank(s for your help.

[Jamo]

Have you considered http://www.stormdevelopments.co.uk/twin-rotrex-r32.html

[maRS2]

Yes but: too expansive, very bad reputation and torque is not where i need it. I need torque at 3000 rpm. I have already almost enough power at red line with the schrick cam's running on E85. Close to 300 Hp at 7200 rpm according to Vag com chanel 120.
Plus I don't want to open engine to install a spacer to lower the CR. that's why I want just 0,5 bar (as early as possible)

[lind4hl]

dont buy an old Holset for sure! most of the old ones are for Diesel cars= huge a/r (my friend bought one, a/r. 1.21)

[Jamo]

Well low boost all the way from 2000 to 7500 is going to be feat, it's all about trade off, with the size of the engine 3071 .63 or similar size may just do it but not sure you'd get boost that low down

[S2Ian]

i would recommend speaking to THE PHIRM who have a good reputation and can undertake a supercharger conversion. have heard good things about this conversion & the company are v friendly + helpful, true vw nuts who take pleasure/pride in their work. just a though

[maRS2]

- S2IAN Thank's but i don't want supercharger as the only available for this engine are centrifugale one's.
Like any centrifugal pump, the boost provided by the centrifugal supercharger increases with the square of the speed. This means that the centrifugal design provides little boost at low engine speeds.
So if I will have 0,5 bar at 7200 rpm it mean that I will get at 3000 rpm may be only 0,1 bar. so let's say no increase torque at this rpm.

-Jamo like said in the begining the engine is 3.2 V6 ( in fact VR6) so 3200 cc.

Thank's for the help.

[maRS2]

The best would be the new S4 twin screw charger like that:
http://cgi.ebay.de/Audi-A4-S4-B8-Kom...4#ht_878wt_893

But I don't have enough space in the engine bay so that's why i want a turbo spooling very early to 0,5 bar and keeping it untill 7200 rpm.

Any body with turbo flow calculator to help me. please.