Just discovered I have a VNT17

[nick9one1]

After trying to replace my 'bodged' turbo to intercooler hose I have discovered that I have a VNT17 turbo. Thats why a previous owner replaced the standard hose.

I understand to make this mod worthwhile you have to have uprated injectors (.216) and a remap? Is there anyway I can tell if my injectors are non-standard? and anyway to tell if its had a remap?

It was originally a 110bhp non-PD ASV engine.

 

[nick9one1]

bump!

do the injectors have the size stamped on them?

 

[bombheads12]

Umm i might be wrong so i do standby to be corrected but i thought later ASV lumps from about 2001 had VNT 17 turbos fitted as standard (to cure the dreaded vanes sticking) ...........

 

[nick9one1]

no idea, does anyone else know?

 

[nick9one1]

Thats the actual turbo part number GT1749VB

http://www.myturbodiesel.com/1000q/tditurbo.htm

this site states that model is from a PD150 euro TDI

so Im pretty sure it isn't standard.

 

[bombheads12]

oops yes my bad sorry

 

[nick9one1]

so to see what injectors I have do I need to take one out and strip it - as if I'm replacing the nozzle? Then see what it has stamped on it?

 

[M1KEH]

Yes, and it might not even have anything stamped on it when you do get it apart.

 

[nick9one1]

so there is no way of knowing?

I wonder if the injection quantity has been turned down with vag-com. If it has that would probably be a pretty good indication they are larger.

 

[M1KEH]

Yes you may be able to tell by idle injection quantity. But it might have been remapped to suit if it's had larger nozzles as well as the turbo.

 

[nick9one1]

yeah true. But it doesn't feel like its making that much power. At a guess no more than 130.
If it has vnt17 injectors and remap. I'd be looking at 150+ wouldn't I?

 

[M1KEH]

Could be all sorts of reasons it's not making power.... Maybe your problem is someone fitted the vnt17 and never bothered with any mapping or fuelling upgrades. Need some vag-com logging really.

 

[nick9one1]

what should I log? boost pressure?

 

[M1KEH]

Actual and requested boost. And injected quantitys. You need full throttle 3rd or 4th gear runs.

 

[nick9one1]

from an old log i had, I will get another tomorrow.
does that look roughly ok though? I know i have a slight leak!

blue = rpm
red= requested
orange= actual

 

[M1KEH]

Need logs of constant full throttle in one gear from about 1500rpm to 3500rpm.