Jump to content
SAU Community

Recommended Posts

Hiya. Yep im using a rb25 highflow from cgc...

Stage 1 450hp build... At the moment running 1 bar and full boost comes on by 3500rpm... Currently pushing out 232rwkw with usual mods, Fuel system, ECU, FMIC ect...

Does anyone know how much the turbo will flow boost wise?

LePpErFiSh.........

Hi Carl, we have 2 GCG Hi flow RB25 turbos, both Stage 1. One is on an R34GTT (RB25DET NEO) and the other on a R32 GTST (RB20DET). The R25DET has 240 rwkw at 1.1 bar and the RB20DET has 220 rwkw at 1.3 bar. The full weight R34GTT did a 12.4 for 1/4, and is used daily, in city traffic, freeways etc and has been that way, totally reliably for 20 months. The R32 is used for circuit racing and the turbo is very responsive in the RPM range we use, it isn't lag free but it's pretty close.

The RB25DET power band looks like this

7000 rpm 240 rwkw

6500 rpm 220 rwkw

6000 rpm 205 rwkw

5500 rpm 195 rwkw

5000 rpm 180 rwkw

4500 rpm 160 rwkw

Average 200 rwkw

There are plenty of 240 rwkw turbos around, but not many that average 200 rwkw from 4,500 rpm to 7,000 rpm. That's what performance is all about, a single hi maximum power at one rpm is point is next to useless. Unless you have a close ratio gearbox or an auto.

Our experience with Stage 2's is that they have to be tuned very carefully as they are very close to the compressor surge line on a 2.5 litre engine (OK on 3.1 litres though). I am personally not convinced that the few extra kw's is worth it on an RB25 and I wouldn't even think about it on a RB20.

Hope that helps

Hi Sydneykid,

What does this mean to us laymens ???

Our experience with Stage 2's is that they have to be tuned very carefully as they are very close to the compressor surge line

thanx for that sydney kidd , very useful info. my st1 pulled 204rwkws at 6300rpm at 1.2bar and that is before i change to a hi flow cat , split dump pipe, cam gears etc. at 7psi boost my peak power was 140rwkws at 6600rpm, why such a difference in peak rpm? would this be because of my restrictive dump/cat? thanx for the great advice, awesome thread!!! did the r34 use aftermarket cams to reach peak at 7000rpm?

7000rpm 253kw

6500rpm 250kw

6000rpm 245kw

5500rpm 227kw

5000rpm 220kw

4500rpm 191kw

Average= 231kw

This is my Hybrid VG30, still going strong with the ceramic wheel and T04 Vtrim comp. This turbo is not yet totally sorted as it will surge in 4th and 5th. Boost must come on after 4000rpm to eliminate surge, I am currently controlling it by dual stage boost controll which automatically switches from 11 to 14psi at 4000rpm.

How long it will last is another issue, been running with it for a few months now. Happy with the $350 outlay so far. :)

Heard alot of good things about GCG. Big outlay tho ,but, just the same as buying a brand new turbo....which is cheaper than any HKS, APEX, TRUST etc.

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

    • Ha ha ha, mine loves to spend, all on the dogs (they're our kids, and her spending would likely rival that of some people raising children!) the only benefit is, her spending is tax deductible as she runs a business in the dog industry 😛 The above all means she can spend race car budget quicker than I can. 😛 That and a lot of the things I want are very expensive, and I can be a bit "you want how much for that?!" And at other times overly impulsive. Or I start the w days of research, get to day 1.5 and get really annoyed that no one will advertise actual specifics and it's just marketting BS and I go "well, now I don't want anything to do with that now!" Also I hate paying lots of money for something I can make from $50 in materials. Then I get the shits halfway through making things and wonder why others who just buy parts have more fun... 😛  
    • Their 240Z with the RB26 would be a real nice thing to have in a garage to come out for an occasional weekend cruise It's such a cool thing in so many ways Sadly, we have a blue 240Z shell that I walk past every day, just sitting outside a shed at work, it has been slowly disintegrating and falling apart into the ground for the last few years, the owner cannot be found, and I am unable to "claim it" I've been told by work and the RMS, the rust in the body is excessive though, and it has had most of the salvageable stuff, like panels, trim and switch gear stripped off it over the last year or two, work keeps threatening to put it in one of our metal scrap bins, I wish they did though, as it makes Mark sad walking past it  
    • Good tips, I like it! 😂😂 My wife is a LOT more frugal than me so it's only me we need to worry about! A splurge to her is buying 2 pairs of socks in one visit at Kmart!
    • Haha, the appropriate response to the question "Is this new?" is "I've had this for a while.". With the unspoken small print that a while may be the time since this morning or five years ago   And to be fair I learned that from the best, i.e. my wife. Because it goes both ways.
    • Yeah kids certainly add a whole another dimension to your life.  Life ceases to be about you and more about them for a while!  And I wouldn't have it any other way.  I love watching them play sport and make new friends along the way. Wow, sounds like your mate is a good guy to know!!!  He's got some serious toys in the toy box!  Yes it would be lovely to be able to do stuff to your car without getting all tied up in boring shit like how to pay for it!!  I would describe my spending style as "aggressively spontaneous and logical but regrettable purchasing"....  That will hopefully make no sense at all which would be appropriate given that is how I buy stuff.  I'll decide at the drop of a hat that I'm buying something expensive, research the living shit out of it for 2 days straight then go out and buy it.  Then I'll have instant buyers remorse for 2 days which generally passes by the time it turns up on the front step!  If I'm feeling ballsy sometimes I'll tell my wife.  Other times it just makes its way silently passed the house and out the back to the shed, never to be spoken of again...
×
×
  • Create New...