Author Topic: TDI vs TDI-m/TD-IDI with VNT (Read 3443 times)

Benjamin · « **on:** November 21, 2006, 05:23:17 am »

When you tune a (electronic) 1.9TDI, you can go till something like 200hp with stock turbo (gt1749vb), if you want more, you need to go for a bigger turbo, some guys tried a gt2052v, but it spools very bad.

when guys on this forum put the gt2052v on a 1.9TDI-m/TD is spools very good.

Can someone explain this? (or correct me if i'm wrong :wink: )

Greetz, Benjamin

Tintin · « **Reply #1 on:** November 21, 2006, 11:18:48 am »

Look at this video, normal shifting 1,2,3,4, towards the end, i put the accelerator on the floor ........ boost instantaneously.

http://video.google.fr/videoplay?docid=2328693919539972270&hl=fr

I have a 12mm pump head with .240 nozzle, with 10mm pump head and smaller nozzle, the boost reaction is slower, but it is acceptable.

QuickTD · « **Reply #2 on:** November 21, 2006, 11:55:01 am »

The TDI electronics won't allow a lot of fueling until boost pressure is present, and a large turbo requires alot of fuel (and some off-boost smoke) to produce boost quickly. Sort of a catch 22 situation.

A custom map that allowed a good amount of smoke off boost would help, thats what the mechanical pump guys do...

Benjamin · « **Reply #3 on:** November 21, 2006, 01:41:51 pm »

Quote from: Named Tintin

I have a 12mm pump head with .240 nozzle, with 10mm pump head and smaller nozzle, the boost reaction is slower, but it is acceptable.

Yeah smaller nozzle's, but the guys who put a bigger turbo also have the bogger nozzle's. (i dont think there is any difrence in the punger & head for this discussion)

QuickTD, sounds good theory, but i wonder the electronics are so good secured.

I heard saying from a professional tuner, a 1.9TDI with a GT2052v should start making boost on 3000-3500rpm.

Greetz, Benjamin