Rb20 And Rb25 Turbo Pictures

[Johnny Cash]

Hey fellas,

I figured hundreds of pics of these two turbos have been posted on this website, but not in the one thread.

Can someone with both turbos post a pic of them side-by-side, with indications of ways to tell if you have one

or the other.

If no-one bothers, I might source pics of the forums and post them up here myself. Might be hard to work

out the difference!

Thanks,

Adrian.

[predator]

I think I have another angle somewhere...

[Johnny Cash]

So far they look identical, save for the giant wastegate on the one on the right.

Incidentally, which is which? :|

[predator]

The wastegate isn't giant.. its the same size as the rb20 one, which you can see in the background. Thats one of the earliest RB20 ones (1989 model) so i think is a bit smaller.

They're not so identical.. the differences are more subtle visually.

1. Such as the point for the wastegate directly on the housing (mind you this is on the rb25 turbo, just hasn't been tapped out from factory).

2. The exhaust housing looks a bit fatter on the rb25

3. The inlet port is smaller and I think a little bit longer on RB20

And of course they have different markings. To the eye it seems more obvious I think.

Its a bit hard to tell when both are fitted and everything such as heatshield, etc is covering it up though.

[RBFIRE]

I believe the 1 on the RIGHT is for RB25

[Johnny Cash]

Are there any numbers on each turbo that are unique to each turbo?

So that one set of numbers / letters appear on ALL rb20 turbos, and another set on ALL rb25 turbos?

[predator]

yeah.. the rb25 ones have like 45vX where X = version number.. The rb20 I think are 16V

Its all covered somewhere you know You tend to forget things and think "oh it'll be on SAU if i need to find it"

[Johnny Cash]

yeah.. the rb25 ones have like 45vX where X = version number.. The rb20 I think are 16V

Its all covered somewhere you know You tend to forget things and think "oh it'll be on SAU if i need to find it"

Thanks buddy, I'll check it out.

[RBFIRE]

i know the right turbo is for Rb25 because i just installed my Split dump,

and i recognise dump,

the top bolt snapped on me, how can i forget??? LOL

[Johnny Cash]

Cool.

I'm gonna be pulling out most of the engine when I do some mods, so I thought I would double-check which turbo I got while I'm at it.

Thanks again.

[TTT]

rb20 = left, rb25 = right

same as above

rb20 turbo off 92 gtst

rb20 turbo with comp cover off

rb25 turbo with comp cover off

sorry about the quality of the pics, this is back when 1.3 megapixels were only for the richies!!

[Johnny Cash]

No need to apologize, thanks a bunch.

I'm gonna print off this whole topic.

Thanks again,

Adrian.

[Dale FZ1]

Top work GTST. Can you post up the actual measurements you got on those impellers?

If they are still apart, then try to get the size of the inducer (smaller end) of the compressor as well. This will allow us to calculate the trim size.

cheers

[Angry]

i know u said rb25.. but i have pics of VG30 vs standard redtop RB20 turbo

thought it might help as well

[TTT]

Negative..

that was back in 2003.

old turbo sold and car sold long ago.