fitting vg30det and rb25det turbos

[Mase]

Could anyone who has done the conversion of vg30det onto an rb20det please supply a few hints and tips. I looked on meggala's site but was after some more info please people. Also, will a vl turbo fuel pump be able to keep up with this turbo happily running up to 12psi boost??? I know you need to rotate the housing on the turbo or something and the oil and water lines won't match up.

For those who have done the rb25det turbo on rb20det could you please list the procedures also.

Im having a lot of trouble finding an rb25det turbo at a reasonable price so im thinking of opting to the vg30det even tho it's a bit laggier. All info would be greatly appreciated.

Thanks heaps people, things are starting to look up for my car now i think.

Jayson

[Mase]

Come on people, i've done a search on this already and came up with not much at all. This is what i've found from meggala's site.

http://www.meggala.com/mods3.htm

Hope he doesn't mind me adding a link of it to the page.

[Mase]

Well thanks everyone for your help. Im doing the thing and finding out for myself, will post information as soon as it's done and i've finished having fun with it. From what i have learnt so far, (rb25det turbo on rb20det) run the line from the wastegate to where your boost guage plugs in at the back of the manifold to save tapping into your intercooler pipes. To keep your boost guage just put a T- piece in there. You will need the rb25 lower intercooler pipe cuz the rb20 one won't bolt straight up. I think i may need a different thread size for the water piping but i'll get into it when i get up to it and last but not least, rusty bolts are a real bitch, expect to break a few.

Part 2 coming soon.

Jayson

ps. by the way, i went for the 25 turbo as my car is sluggish off the start as it is and putting a vg30det turbo on there would of made it worse.

[BOOSTD]

Straight bolt up for all!!

VG30bb will have no more lag, but, make less power than RB25

VG30 non bb has a bigger exhaust wheel and makes more power than the RB25 but is laggier

Intercooler pipes don't need to be changed as the Tri bolt flange on the comp housing will bolt up to any of the RB turbo outlets.

[Dsturbd]

I have same set up on my wagon ... lazy down low great topend made 210@wheels on 12psi stock factory 31 cooler

[rbs13]

dont the rb25 turbo's just have the wastegate to compressor cover control method for boost?

[BOOSTD]

The wastegate actuator has to be changed( to your old one), if the housings are rotated.

rbs13: VG30 has the nipple on the comp cover, the rb25 gets its sense from the intercooler pipe.

[Mase]

or you can just t-piece it off where you plug your boost guage in on the back of the manifold. I have tried lining up the flange from the intercooler piping from the turbo, to the connector that the intercooler hose goes to and the rb20 unit's bolts don't line up as the unit is smaller. Will take pics later to show you. Mine is a series 2 r33 turbs.

[HRthirtyone]

just drill and tapp the outlet pipe, screw your "nipple" in that for the boost line that goes to the wastegate on rb25 turbs. Thats what i did, works fine. Just remember to drill a hole in the thick side so you actually have something to make a thread in...

[BOOSTD]

S2 R33 turb, so it has a plastic comp wheel? Be careful as they can't run as much boost as the S1. Don't stress if you intend on running less than 15psi as they have better spoolup anyway.

[Mase]

yeah i wasn't gonna be running anything silly. Stock boost till i get a boost controller and front mount then nothing too much. Got dramas now, i don't have the pipe that bolts to the turbo. The one which the cooler piping goes onto. The rb20 one is smaller and nobody has one around. Think one might need to be fabricated which means more cash. grrrrrr

[TTT]

Mase..

I had the same issue.

I drilled out the holes of the elbow pipe from the R32 turbo all the way to the edges.

It now fits.

[Mase]

Had any reliability issues mate???

[TTT]

nope.

so far....

Been running 13psi for the past 6 months.

standard fuel pump and injectors.

no pinging or anything..

All good.

NOTE: My one is from a series 1 R33.

[Mase]

Alright, all is sorted!!!! Does ur's run 0.4 bar stock??? Mine does. I got the r33 piping off the guy who i bought the turbo off for free so it's all good. Can't wait to go out tonight in it. Missed my car!!!! hehe The turbo went on with the only problem being the wastegate vacuum line which i simply T-pieced off with another vacuum line just above it on the cooler pipe. Will post pics maybe.