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Rb25 Turbo Differences Between Models?

eXc

By eXc,
in Engines & Forced Induction

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eXc Mentor

eXc

Posted
Posted (edited)

Hey Guys,

I've spent the last 2 hours searching and can't find it.

Can anyone link me or;

1) tell me the differences between the R33 turbos.

2) Which one is best suited to the RB20.

3) I know you need to make sure you get "the elbow" for the conversion...but what is it? What does it look like?

4) Any other things I should do first? Fuel pump perhaps? Will I need a SAFC or similar aswell?

Cheers

Chris

Edited by eXc
r32matt Collaborator

r32matt

Posted
Posted (edited)

Hey,

Get the R34 Turbo!

I have a R34 Turbo on my RB20 and it runs really well! Bolted straight on and used the RB20 Actuator to get the stock 10psi. Boost starts just before 3000revs and Full boost comes on just before 4000revs. :D

Edited by r32matt
salad Veteran

salad

Posted
Posted

1. i dunno but i would like to find out. i recently just too my S1 turbo off and replaced it with an S2 (because the S1 was rooted) and noticed that the design of the compressor wheel was a little different. the smaller blades did not protrude past the tip of the bigger blades.

and the S1 has a steel compressor where as the S2 has a nylon compressor

2. the S2 is supposed to spool faster due to the lower rotational mass, and seeing as rb20s cant spool turbos well, this would be better.

3. the elbow is the compressor outlet. go have a look at your turbo, it is the first pipe that comes off of your turbo, and goes into your intercooler piping

4. fuel pump is definitely a good idea, and you really should do it, just in case. another good bang for buck mod is to get your ECU remapped. cheap and just as effective as stand alone ECUs. and come with all the stock knock sensors, cold start crap etc

123456 Proficient

123456

Posted
Posted

The r34 turbo, is pretty laggy i think (has the same sized exhaust wheel as the vg30). In first it doesnt start spooling to about 3-3.5k so it makes taking off sort of hard, it does kick in hard at about 4.5k though. The performance increase wasn't all that great for me, i got a remap at the same time and achieved only 164 rwkw (on the same dyno, that i had had it measured, close to stock, at 133rwkw)

i will upgrade to cgc hi flowed series 2 r33 turbo soonish

Unless i get off my P's before then, and can get a GTR

salad Veteran

salad

Posted
Posted (edited)

S1 is definitely still worth it

easy to tell the different compressors, one is aluminium and the other is nylon. they feel much different

and the number on the comp cover is different

i think the S2 has 45v4 and S1 has 45v3

may need someone to confirm, thats just going by my crappy memory :D

Edited by salad

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