Rb25 Turbo Onto Rb20

[bj_dove]

gday everyone, as the topic states, im just wondering how easy is the change from the stock rb20 turbo to the r33 unit? as far as oil/water lines, etc. go?

cheers

(btw, did a search but couldnt find anything, sorry if its been covered b4!)

[jas/slo32]

bolts straight on oil water lines will fit dump pipe etc done the swap twice now very easy

[bj_dove]

cheers dude, much appreciated

[rb20inside]

what about other things like injectors and fuel pump? do these need to be upgraded along with the turbo swap?

[nismo33]

not neccessarilly..but if you want to gain more HP then i suggest you do.

but you're better off getting a FMIC or an aftermarket comp.

[RedDrifter]

Ive done the swap aswell and you will find a god increase in power for the same boost.

If your not using a bc make sure you swap over the Actautors as the Rb25 one is set around 5psi from memory and the RB20 is set at 10 psi i think.

As jas/slo32 said its quite easy to do.

[Cubes]

Does the RB20DET's compressor elbow that connects to the IC piping bolt up to the R33 RB25DET turbo?

I know the R34 Compressor covers outlet is slightly larger than the RB20DET's. As a result you have to use the R34's elbow.

Has any one taken to time to measure the Comp wheel of an rb25 turbo?

I have a few approx measurements..

R34 RB25 Turbo.

Inducer - 49mm

Exducer - 66mm

Approx Trim - 55

VG30DET Turbo

Inducer - 46mm

Exducer - 63mm

Approx Trim - 54

The R34 RB25 and VG30 turbo's share the same slightly larger turbine housing. Apparently it measures some where around the .7 a/r where as the rb20/25 is around the .6 a/r. I was told the sizes by a turbo shop.

When I pull my rb20det turbo off I will measure its wheels and also compare.

Edited September 1, 2005 by Cubes

[bj_dove]

thanks for all the effort guys, im just looking to make it an easier swap as possible

[silver gts-t]

Does the RB20DET's compressor elbow that connects to the IC piping bolt up to the R33 RB25DET turbo?

I know the R34 Compressor covers outlet is slightly larger than the RB20DET's. As a result you have to use the R34's elbow.

Has any one taken to time to measure the Comp wheel of an rb25 turbo?

I have a few approx measurements..

R34 RB25 Turbo.

Inducer - 49mm

Exducer - 66mm

Approx Trim - 55

VG30DET Turbo

Inducer - 46mm

Exducer - 63mm

Approx Trim - 54

The R34 RB25 and VG30 turbo's share the same slightly larger turbine housing. Apparently it measures some where around the .7 a/r where as the rb20/25 is around the .6 a/r. I was told the sizes by a turbo shop.

When I pull my rb20det turbo off I will measure its wheels and also compare.

<{POST_SNAPBACK}>

yeh you need the rb25 turbo elbow. rb20 doesnt fit

[predator]

Does the RB20DET's compressor elbow that connects to the IC piping bolt up to the R33 RB25DET turbo?

no.. tried it.. bolts holes don't match up that well, and smaller diameter hole on the flange. You sort of *could* get it to work via redrilling, but could cause problems.

[bj_dove]

so anyone got an rb25 elbow up for grabs???

[predator]

all i can say on that is.. good luck!

I don't know why people always take them off when they sell them as they can't be too useful for anything else, but you tend to find a large number of the rb25 turbos without them, and they can be a bitch to track down.

[RedDrifter]

yeh you need the rb25 turbo elbow. rb20 doesnt fit

<{POST_SNAPBACK}>

Yeah it will with the help of a bench drill or a die grinda

Thats what I did till I got my hands on a RB25 elbow.

[Cubes]

Any one got measurements of the RB25 compressor wheel? Please..

It would be interestering to see the difference between the r34 and r33 comp wheels.

[salad]

howdy, considerin buyin an r34 turbo for my 32. would this be similar/same to bolting on the r33 turbo? thanks guys

[Cubes]

yes

[discopotato03]

Also a while back someone posted pictures of the R34 GTt turbo from the compressor cover side next to the R33 version , tried searching but can't find it . Anyone ?

Thanks A .

[Cubes]

If you need any pics of the r34 comp wheel etc let me know.

[discopotato03]

Yes and the cover as well please , its larger isn't it ?

Cheers A .

[Cubes]

No probs. I'll pull the comp cover off and take some more.. It appears I've misplaced the ones I took prior.

R34 cover is the same size as the VG30.

RB20 is smaller yes.

Edited September 2, 2005 by Cubes