ZD30 VNT?

**Dougal** · 20th June 2011, 11:23 AM

Originally Posted by c.h.i.e.f

Dougal that GT2256v what max psi will it produce? And what's its most efficient psi you will run it at (to have max flow and psi) ? Did you get that of a 2.7 merc ? wreckers over here want new prices for turbo's

No idea really, garrett don't publish maps for their VNT turbos. Yes it's off a 2.7 merc, I bought it out of Aussie Ebay years ago.

I'd be a bit leary of pushing them past 20psi. But when I get around to installing an intercooler 20psi will be heaps.

**c.h.i.e.f** · 20th June 2011, 05:02 PM

yeah i couldnt find any graphs on the vnt's its a bit annoying really! what did you purchase the turbo for all those years ago may i ask ?

mmmm cant wait to see yours (in a video of course) once you finally install the intercooler

also of topic but did you hear what the final price was for grubbs MSA conversion kit turned out to be?

**Dougal** · 20th June 2011, 05:51 PM

Like fine wine, my projects are carefully aged.

**Vern** · 20th June 2011, 06:04 PM

Originally Posted by Dougal

Like fine wine, my projects are carefully aged.

More like collectors wine, never to be drunk

Chief, PM Sheldon for a price, i know what mine cost

, pick it up wednesday

**c.h.i.e.f** · 20th June 2011, 07:15 PM

hahhahahahahahahahahahahaha max points

and thanks vern i shal do that

**goanna_shire** · 21st June 2011, 06:30 PM

Thanks guys for writing back. You're right about wreckers wanting new prices for turbo's over here. I appreciate the advice on sizing of what would be good for the job. I want to get a VNT that suits the Isuzu properly.

I was a bit suspicious about the .53 comp and .64 exhaust on the gt2050v because how can something from the '20' family have such measurements? I was under the impression that the 4bd1 needed something in the '25' family. However I don't know much about the VNT type turbo's and your right about finding information (maps and such) about them, its next to impossible.

I would love to get my hands on the GT2556v if anyone knows where the hell to get one from. I reckon they'd probably be the choice for the 4bd1's entire rev range and upwards of 20psi.

Cheers,
Goanna

SheldonA · 24th June 2011, 07:49 PM

Originally Posted by goanna_shire

Thanks guys for writing back. You're right about wreckers wanting new prices for turbo's over here. I appreciate the advice on sizing of what would be good for the job. I want to get a VNT that suits the Isuzu properly.

I was a bit suspicious about the .53 comp and .64 exhaust on the gt2050v because how can something from the '20' family have such measurements? I was under the impression that the 4bd1 needed something in the '25' family. However I don't know much about the VNT type turbo's and your right about finding information (maps and such) about them, its next to impossible.

I would love to get my hands on the GT2556v if anyone knows where the hell to get one from. I reckon they'd probably be the choice for the 4bd1's entire rev range and upwards of 20psi.

Cheers,
Goanna

I got my GT2559V from here;

Naprawa i regeneracja turbospr??arki - Scrollproducts, Turbo Serwis Warszawa

if it's any help.

**Bush65** · 15th July 2011, 09:46 AM

Originally Posted by justinc

Electrical/ vac controlled though

Would be a good unit if modded to pressure actuated control instead. If a ZD30 can destroy them (And the pistons etc) at constant 800+ degrees EGT's

, should be safe at the 4BD1 's temps

JC

The vac actuators work ok by connecting the actuator to vacuum source with a tee to a boost pressure line (from compressor). The boost pressure line must be fitted with a Dawes valve (3 bar racing) made for the VW tdi. Boost signal in to dawes valve - outlet from dawes valve to vac actuator.

Edit: An orifice is needed in the vac line, on vac source side of the tee for the pressure signal from the dawes valve.

The dawes valve adjusts peak boost pressure.

If required (not always) the turbo spool rate can be adjusted by a needle valve in a line to atmosphere (use air filter) to the vac line tee in between orifice and actuator. The clean air through the needle valve reduces the vacuum.

To adjust the spool rate, close needle valve, start engine. At idle open needle valve until actuator arm drops away from the stop screw, then close slightly until arm just touches the stop screw.

See this link http://www.chaz.yellowfoot.org/Manua...Controller.htm

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