R32 - Turbo Upgrade /rb25 Or Vg30?

[Mr. iNFMS]

Ok so ill probably get the old 'search' bla bla. I want the specific input from people in South Australia.

First off - my stocker turbo is making a nice cat noise under boost, she still pulls hard, im thinking end shaft play, wheel hitting the housing..

After having a quick chat to Showza "read 4 door crazy slider" he seems to think rb25 turbo on my 93, gts-t will be better for the street than a vg30 turbo.

What are your thoughts and suggestions/theorys why i should get whichever turbo?

What needs to be done with both, oil/water lines etc?

Pretty much i can get a VG30 turbo for around the $400 mark, and likewise the RB25 turbozz.. haha

Im aiming for 200kw street driven.. but don't like the idea of lag.. (4000rpm boost kick in)

Cheers,

Cola

[Cubes]

RB25 turbo all the time every time.

VG30 turbo is nothing more than an rb20det turbo with slightly larger housings.

The RB25 turbo runs a larger compressor wheel, so it has the capability to flow more air.

[Mr. iNFMS]

Exactly what showza said haha.. anyone else?

[sinistaGTR]

yeh go the rb25 turbs mate, seen both in a rb20 before and the rb25 was so much better. cant remember specifics like lag etc etc as it was a while ago but the rb25 turbo was the better of the two.

[rad100]

vg30's lag to much!!! i felt even the rb20t was better! but yeh def the rb25 as thats wat im going very soon!

[/2on]

Def the rb25 turbo can't go wrong

[evsr31]

Just thinking of doing the same on my drift pig for a little extra oomph, cubes as well as the compressor wheel being bigger is the exhaust wheel bigger as well? id assume it is, and the housing looks to be bigger as well.....is an rb25 exhaust housing the same size as a vg?

*edit* Mr Infms, not sure if you'd quite break 200rwkw with an rb25/vg30 but be close......id say around 192-196rwkw.....If you want around 215 or more go a

HKS 25/30, minimal lag and a very responsive turbo, and can flow decent power.

Edited April 30, 2007 by evsr31

[salad]

Forgot to mention, I've got 1bar (pretty much) by 3000rpm in 4th You wont get the VG30 turbo to do that.

RB25 rear housing is smaller than VG30, that's why VG30 isn't the best match for the RB20.

Doubt you'll make 200rwkw with the either turbo, but 180rwkw is plenty for the street. I can take you for a drive in my car if you want.

Cheers,

Showza

Edited April 30, 2007 by salad

[evsr31]

Cheers for clearing that up, thought the rear housing was smaller making it more responsive.

Mates car is running a vg30 with more boost, exhaust, and no remap making 194rwkw on 1 bar, but thats a fair freak motor im thinking.

I'll def go 25 in the future, been in one with a 25 turbs and didnt feel too laggy at all.

As far as I know the oil feed / return and water feed / return line straight up? can anyone confirm this -_-

[Evil34]

You ever thought about getting a turbo off of a neo RB25 motor?

I know Nightcrawler has just taken his off of his car and he might be able to sell you that as it is meant to make more power and spool quicker that the R33 turbo as it has a nylon rear wheel.

[lows_13]

I'm running a R33 S1 turbo with the steel inlet wheel.

I would probably go for a R34 turbo if i had the chance though.

[Cubes]

R34 turbo is essentially the R33 Series 2 turbo with the larger VG30 OP6 turbine housing.

It will be laggier..

The R33 S2 turbo is still the best bet closely followed by the S1 turbo.

I know of an rb20det that ran up on the boostworx dyno; rb25 turbo, good fmic, straight through 3" exhaust, ebc holding 14psi to redline & remapped ecu made 190rwkw.

[evsr31]

Yeah that is a nice output, mates car that I was talking about with 194rwkw feels real good.

[Cubes]

I've attached his dyno sheet.

I hope he doesn't mind.. Shouldn't as he's posted it here before.

As you can see the std injectors are hitting 100% duty with close to 14:1 by peak power. :S

To hold a flat 12 on std rail pressure the std injectors hit 100% duty at around 180rwkw from what I've seen with mine and 2 others. All on the same dyno obviously... Different dyno's you may get either a higher or lower reading. But its all very close, generally only 5-10rwkw max providing its a DD dyno and run in the correct shoot out mode.

[rad100]

how much do 2530's go for?? and r they straight bolt ons???

[Ronin]

Thats my dyno graph you posted cubes and no i don't mind

That run was done before i got my 040 pump and now the afr's are much nicer.

[evsr31]

You will need lines to suit, second hand around $1250.00 for a decent one.

And they are a t3 flange obviously.

*edit* sheez that leans out fair hard towards peak power.......injectors would be loving it.

That was with the remap I take it, without the remap they wouldnt be leaning out so hard?

Edited April 30, 2007 by evsr31

[Cubes]

Thats my dyno graph you posted cubes and no i don't mind

That run was done before i got my 040 pump and now the afr's are much nicer.

ahh good stuff Ronin..

How did the power go with the richer afr's? Didn't drop too much?

[Ronin]

Yea twas a tad lean, thats a donnan remap for ya haha. Got gtr injectors in it now. Soon a TD06 20g.

Edited April 30, 2007 by Ronin

[Cubes]

Awesome turbo those td06-20g's. On the std exhaust manifold or a nice highmount (Troy style)?