260rwkw RB20 turbo recommendation

[Sydneykid]

Sorry guys, the PM still has all the data on the airfilters just to make sure everybody gets their stuff. I cleaned it out a bit, so you should be able to send me PM's now.

Sorry about that.

Hi Brody, Roy was spot on, purchased some 2 mm aluminium sheet from Capral and made it myself. Has cold air feed from LHS bumper vent (easy with FMIC). I bought enough to make a top for it, but the temp sensor never shows more than ambient. So I haven't bothered to make one.

Hope that helps

[Steve]

INASNT, I have been told by shops (one in adelaide, one in perth) that if you buy a 2835 internal gate to fit skyline, it fits.

I'll check with someone I know who is getting one from Japan to see what the go is.

[Guest INASNT]

steve

i have heard mechanics talk alot of bs. Unless they have physically used the 2835 pro s they r just assuming things.

[Steve]

Well, if you are too worried, just get a high flow:)

[GTStR32]

would the 2835 be to laggy for the rb20?

should i stick to the 2530?

[Steve]

Bigger turbo = more lag. If you keep the turbine a/r small as possible, less lag.

[Cubes]

For a street car yes.. Really the RB20DET if you want it to be a quick street car is only good up to around 220rwkw which is the GT2530.. Any bigger and you will be left way behind playing catchup which on the street you wont be able to do unless you want to wind third gear all the way out 140km/h... By then its all ready over.

Remember its not always all out peak power that makes you quick.. Its the mid range power that gets you there.

UNLESS.. You had a GTS4.. then you can redline it and dump the clutch at the lights and get traction.

[GTStR32]

LOL

thanks dude

[Cool Hand Luke]

Thanks for all the info. Much appreciated.... ive found it very hard to get anybody to take me seriously in shops when i try to ask questions. Sounds like the 2530 is the way to go, which is what they recommended in zoom. If i was to get my standard turbo hi-flowed, how would that compare to the 2530? I know that with it standard, it looses boost after 5500rpm, will it do the same with the hi-flow, or will it be able to rev to its 7500 rev limit? I also have a VL turbo fuel pump, how many rwkw are they good for?

Thanks

Luke

[Cool Hand Luke]

Also with the correct tuning, would i be limited to 1.2bar as a street car, or should i be able to run 1.5 bar? Will the 2530 or the hi-flowed std be able to run those boost levels? And who would be able to hi-flow it in queensland? I also have a 3 inch exhaust with seperate dump pipe that enters the exhaust just under the firewall. At the moment it uses a 2.5 inch cat, resonator and straight through muffler, would upgrading the resonator cat and muffler so its 3 inch system all the way through be ok for 220-250rwkw or will i need to goto a 3.5?

[Cubes]

You could make 220rwkw with a decent intercooler and exhaust ona GT2530 with around 1.1bar of boost which is around 16-17psi.

Realistically for an every day streeter with standard internals you don't want to go over 17-18psi.

I.e the bigger the turbo the less boost you have to run to make the same power as the smaller turbo.

You want to try and keep boost to a minimum if possible..

Highflowed.. No... Unless you only want 210rwkw and thats with running lots of boost. They tend not to be as efficent as a HKS or GT turbo. Hence you have to run more boost to obtain similiar power.

[Brody]

As this may not be clear,

the more boost u run, the more power u make. This also means the more pressure on the engine. Generally you'd want to run as low boost as possible (eg ebc, or some other boost controler) and when you want to run/etc, up the boost and play. This way, you keep the engine as stress free while still having fun when needs be.

[Cool Hand Luke]

Where would be the best places to start looking for a 2530? Pref. in queensland but anywhere would do.. And what sort of prices would i be looking for a new and a 2nd hand?

[Cubes]

Every turbo has its limit. You may be able to push 20psi through a RB20DET turbo but that air is hot therefor causing detonation and you have to pull a heap of timing out so dropping the boost down to 16psi will most probably make more power or the same power as you will be able to run more timing etc.

Little like overclocking a CPU really.. You have to find the sweet spot. If you start pumping in to much boost you will find you have to pull out to much timing and you still only makes the same amount of power as you would if you were to run say 2psi less but with more timing.

i.e In Zoom i think at first the RB20DET with the HKS GT2530 was running around 1.2 bar or something and made 220rwkw they then tuned a little better and made 220rwkw with only 1.1 bar.

Every car is slightly different as is every dyno but as a guide don't expect to much more out of a GT2530 that 220rwkw.

[Sydneykid]

"Highflowed.. No... Unless you only want 210rwkw and thats with running lots of boost. They tend not to be as efficent as a HKS or GT turbo. Hence you have to run more boost to obtain similiar power."

We Run a GCG Hi Flow at 1.1 BAR for 210rwkw.. and ya can keep turning up the boost.....or go to the 500hp Hi Flow... or even further...

[Roy]

Hi-flow means so many different things.

I dont agree that all hi-flows run out of puff at high boost.

A bad hi-flow might, as im guessing it would have more to do with the fact that you are running a large compressor wheel, say 450hp, whilst still using the crappy internal wastegate of the OE turbo. So the exhaust side of things gets choked up with all the airflow

Some Hi-flows use different exhaust housings with bigger wastegates, others dont. If the hi-flow has had some though put into it by someone with experience, then it is my opinion it can do equal/better job then off the shelf 2530, at around 1bar of boost.

[Sydneykid]

I'm with Roy

S of S

[Cool Hand Luke]

Another few questions:

We Run a GCG Hi Flow at 1.1 BAR for 210rwkw.. and ya can keep turning up the boost.....or go to the 500hp Hi Flow... or even further...

Who is GCG? And how much did they charge to do that. These used the standard turbo to do it? Do you have a contact number for them?

I was told also that i could use a VG30 exhaust housing with a RB25 compressor wheel and should flow 200-220rwkw...

And another one. With intercoolers.. I have a few options and a bit of a budget to stick to. I can do a 600x270x57mm PWR core with custom end tanks fitted up for $1100 or a 500x270x57 PWR core for $900. My other option is using a truck core with 600x270x60 core for $900 fitted.. What would be the best option, i realise i wont be able to get 250rwkw, but aming for something more realistic like 220 will the smaller PWR cooler be fine to use? And is a 3 inch exhaust big enough for 220rwkw?

[Sydneykid]

www.gcg.com.au

Cost us $1800 with a standard RB25 turbo (came on the RB20)

Best option for i'cooler is a standard GTR i'cooler, good for 300rwkw+

S of S

[Roy]

See www.gcg.com.au

XTRGTST-STG1 450hp rated $2250.00

XTRGTST-STG2 500hp rated $2450.00

They are a Sydney turbo company that would seem to be doing some good things with turbos. Sub-Zero cars often use GCG, i think Protechnica GTP STIs also use them. I have also seen their turbos on some serious drag rotors.