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Hi everyone. i have in my possesion two turbo's that have come off r33's. One i don't know what series it came off and its is labeled 45v3, i one i am told has come off a 97 series 2 r33 and it is labeled 45v2.

Now i have done some searching and from what everyone is saying that there is no difference in them. on a visual check they both look the same, but if you look at my attached pics they have different compressor wheels. and thats the only difference.

45V3

post-34711-1188816122_thumb.jpg

45V2

post-34711-1188816252_thumb.jpg

my questions are, is this normal? and will one perform better than the other?

thanks

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So from what i've read/heard, the later number is the later turbo... 1 and 2 came on series 1 and 1.5, v3 and v4 came on series 2's....

Series 2 has a nylon/plastic/whatever compressor wheel, thus it spools earlier/quicker.

I really thought the dual-fin was the series 2, to help spool lower down. Man, now i'm confused!

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i've just stripped them down and come to the same conclusion as RANDY and MANWHORE. one is steel wheel and one is plastic. yeah is for an rb20, i already had the steel wheel one on there, and managed to get the other one fairly cheap so i grabbed it.

so the plastic one would be better to run, i.e quicker spool, better power? and would i be right in saying they would be very prone to blowing up if overboosted? safely boosted at 14psi on an everyday driver?

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The compressor wheel is not the problem, both turbo's have a ceramic turbine wheel (the part the breaks).

The compressor wheel IS a problem on the S2s, quite a few people have had them break under duress. I'm one of those :)

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Standard RB20 turbo on my RB20 ran absolutely fine at 14psi for a little over 6 months till I put a s1 RB25 turbo on there. Rb25 turbo is currently running 12psi due to lack of fuel at high rpm. New pump and remap and I'll turn it up to 14psi, I have no fears. Personally I believe the majority of failures are due to people winding the boost up without a full exhaust, the existing restriction in dump/front pipe/cat combined with the extra gasses being forced through heats up the turbine/housing a fair bit.. when my stock cat shat itself, dislodged and blocked up, my turbine housing (rb20 turbo) would glow almost transluscent red.

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