Thread: Variable Vane.

Looks good Dougal!

Is the hole near #3 for egt measurements? I am currently wondering where to drill and tap my manifold.

Thats a TD5 turbo Id be thinking?

Looks good to me.

Originally Posted by isuzurover

Looks good Dougal!

Is the hole near #3 for egt measurements? I am currently wondering where to drill and tap my manifold.

That's the one, drilled and tapped for 1/4" BSPF, same fitting as the manifold I'm currently using.

It's a GT2256V, this one from a mercedes ML270CDI but the HS2.8 used one of the same size. The actuator you can't see, it's hidden underneath. I have a hundred small details to attend to before I can get it working.

im new to this , an can t see yr work but am curious as i have just accidentallllly put a vt on and have intercooled it , but we can not controll it ,
makes sence now now i know what vt means.we have dynoes it an set manuall at around 2.5 bottom and it tops at around 10 so as to not start running lean any what of blowwing of the axcess at the to so as we can boost it a lil more dwn low to get my pirenti of the mark?

Originally Posted by dylan gover

im new to this , an can t see yr work but am curious as i have just accidentallllly put a vt on and have intercooled it , but we can not controll it ,
makes sence now now i know what vt means.we have dynoes it an set manuall at around 2.5 bottom and it tops at around 10 so as to not start running lean any what of blowwing of the axcess at the to so as we can boost it a lil more dwn low to get my pirenti of the mark?

I'm not sure if I fully understand your post.

Many engines with variable nozzle/vane turbos are computerised and the computer controls the vanes using a vacuum actuator.

The Isuzu engine does not. So it is necessary to replace the vacuum actuator with a boost pressure actuator from a conventional waste gate turbo. Then by adjusting the screw from the actuator, you can control the vanes.

It may be necessary to increase the maximum fuel setting (screw on the injection pump) to get high boost pressure. You should be able to get 20 psi boost (or more).

There is nothing wrong (in fact it is desirable) with running a diesel lean - they love it, because it reduces the exhaust gas temperature.

It's a GT2256V, this one from a mercedes ML270CDI but the HS2.8 used one of the same size.

I have an allisport VNT kit for my 300 TDI taken off a HS2.8 and the Turbo is a GT2556V.
Been trying to look for the specs can't find them.IMG_1117.jpgIMG_1119.jpgIMG_1120.jpgIMG_1133.jpg

Originally Posted by xrayxray

It's a GT2256V, this one from a mercedes ML270CDI but the HS2.8 used one of the same size.

I have an allisport VNT kit for my 300 TDI taken off a HS2.8 and the Turbo is a GT2556V.
...

That turbo and exhaust manifold are different to ones I have of a HS2.8.

The turbine and compressor housings are different - mainly turbine inlet flange and compressor outlet orientation. The manifold is different to suit the turbo.

But these differences are unlikely to affect the porformance.

What you have is a much better suited for the 300Tdi.

Here are pics of the HS2.8 and the VNT turbo that I fitted to my 300Tdi.