Jump to content
SAU Community

Recommended Posts

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

Link to comment
https://www.sau.com.au/forums/topic/166593-r32-turbo-upgrade-rb25-or-vg30/
Share on other sites

  • Replies 42
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

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 by evsr31

Forgot to mention, I've got 1bar (pretty much) by 3000rpm in 4th :P 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 by salad

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 -_-

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.

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.

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.

post-382-1177911702.jpg

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 by evsr31

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Even more fun, leave all the ADAS stuff plugged in, but in different locations, hopefully avoid any codes!   And honestly, all these new cars with their weird electronics. Pull all the electronics out Duncan, and just shove an aftermarket ECU and if needed a trans controller in, along with a PDM. Make it run basic but race car styled!
    • To follow up a question from earlier too since I had the front bar off again (fking!) This is what is between the bumper and the drivers side wheel And this is the navigator side, only one thing but its a biggy! So basically....no putting coolers in the wheel arches without a lot of moving other stuff. Assuming I move to properly race prepping this car I'll take that job on and see how the computers respond to removing a whole bunch of ADAS modules
    • So I prepped the car for another track day on Wednesday (will be interesting to see coolant temps post flushing out and the larger reservoir, with a forecast of 3-14 being 20o cooler than last time I took it out). Couple of things to mention; since I am just driving the car and not taking a support vehicle, I took the rear seats out and just loaded the back up Team Trackday style. Look at all that space! To cover off removing the rear seat....it is weird (note the hybrid is probably different because it wouldn't have folding rear seats) Basically, you remove the lower seat base, very similar to a r series but it is a clip that pulls forward to release the base rather than it being bolted down. Easy Then, you need to remove the side section of the rear seat on each side. There is a 14mm head nut at the bottom of the side piece, the it slides upwards off a hook at the top to release; you also need to unhook the seatbelt from the loop at the top. Then the centre piece is weird. You need to release/fold the seats forward with the tab in the boot on each side From there, there are 2,x12mm headed bolts holding the rear of each seat to the folding bracket, under the trim between the rear seat and the boot (4x christmas tree clips there, they suck). The seat is out but you can see where the bolts attach to the bracket
    • As discussed in the previous post, the bushes in the 110 needed replacing. I took this opportunity to replace the castor bushes, the front lower control arm, lower the car and get the alignment dialled in with new tyres. I took it down to Alignment Motorsports on the GC to get this work done and also get more out of the Shockworks as I felt like I wasn't getting the full use out of them.  To cut a very long story short, it ended up being the case the passenger side castor arm wouldn't accept the brand new bush as the sleeve had worn badly enough to the point you could push the new bush in by hand and completely through. Trying a pair of TRD bushes didn't fix the issue either (I had originally gone with Hardrace bushes). We needed to urgently source another castor arm, and thankfully this was sourced and the guys at the shop worked on my car until 7pm on a Saturday to get everything done. The car rides a lot nicer now with the suspension dialled in properly. Lowered the car a little as well to suit the lower profile front tyres, and just bring the car down generally. Eternally thankful for the guys down at the shop to get the car sorted, we both pulled big favours from our contacts to get it done on the Saturday.  Also plugged in the new Stedi foglights into the S15, and even from a quick test in the garage I'm keen to see how they look out on the road. I had some concerns about the length of the LED body and whether it'd fit in the foglight housing but it's fine.  I've got a small window coming up next month where I'll likely get a little paint work done on the 110 to remove the rear wing, add a boot wing and roof wing, get the side skirt fixed up and colour match the little panel on the tail lights so that I can install some badges that I've kept in storage. I'm also tempted to put in a new pair of headlights on the 110.  Until then, here's some more pictures from Easter this year. 
    • I would put a fuel pressure gauge between the filter and the fuel rail, see if it's maintaining good fuel pressure at idle going up to the point when it stalls. Do you see any strange behavior in commanded fuel leading up to the point when it stalls? You might have to start going through the service manual and doing a long list of sensor tests if it's not the fuel system for whatever reason.
×
×
  • Create New...