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260rwkw RB20 turbo recommendation

Cool Hand Luke
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Cubes Grand Master

Cubes

Posted
Posted

Remember GCG slap together excellent turbo's.

They are an exception as with a few other places around i.e Vince.

However in adelaide we have the local turbo specialist who is on Marion road. They built a highflowed BB turbo that made full boost by 4000rpm on a RB20DET but needed 18psi to make 200rwkw then it maxed out. You could run more boost but you wouldn't make anymore power due to timing being pulled.

Then there's Dynamic turbo charger services who are also supposed to be very good. They highflowed a mate of mines RB20DET Turbo and he only made 140rwkw on 16psi.. WTF is going on there..

So don't just go to anyone to get your 'Highflowed' turbo.

Either get one from GCG and be happy or I have also been impressed with a Turbo Vince had put together for whatsisname that made 257rwkw on 13psi.

It is still very hard to beat a GT2530 for performance when it comes to lag but the GCG is right behind it.

Roy.. You hit the nail on the head.

S of S.. Remeber that RB20DET owner here that ran a stage 2 compressor in his turbo? Apparently it was surging like hell and had to have a Stage 1 compressor fitted.

Is that caused by the highflow using the smaller exhaust housing of the RB20DET? Hence the turbo was over compressed.

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Steve Grand Master

Steve

Posted
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HKS 2530, try here: http://www.skylinesaustralia.com/forums/sh...5274#post365274

Start form about 2.4k with wastegate and gasket - and you can sell your old turbo for a couple hundy back. Be very careful with second hand HKS turbos - make sure they are tested and ok - I heard from a someone I consider VERY reliable, that a major importer of second hand turbos here in aust - only one in ten are ok - rest are on their last legs. If you have to rebuild, the whole cartridge must be replace, therefore its more expensive in the long run.

RB20 DET has only 8.5: c/r - so should be fine to boost to 1.2 bar all day every day (yes I have seen it done) with a decent cooler. As with any car make sure your fuel pressure doesnt drop, injectors all flowing ok etc.

Another 0.02

At this rate, all these 2c are going to start adding up

Cubes Grand Master

Cubes

Posted
Posted

I have had a bad run with second hand turbo's my self.. 3 duds one after another. So for me its not an option.

I was considering a GT30 500hp turbo for the 3ltr but it turns out i have to frig around with waste gates etc.. I can get a custom gt30 with an integral wastegate and smaller housing so that it bolts traight on to the standard manifold but that price blows out close to 3k so i am once again back to the GCG Stage 2 turbo.

Realistically if i start hitting 300rwkw its going to blow the whole budget out the window with regards to internals, drive line suspension everything.

It should make 260rwkw on a 3ltr no probs. What are your experiences or what have you seen with this stage 2 - S of S on a RB30DET?

aybee Experienced

aybee

Posted
Posted

i asked an a midas exhaust place about 3.5 and he said that he didnt know of any places that had 3.5 mandrel bender. only place he thought would be a truck exhaust place. but hell, then you could go for 4 or 5 inch.

if you can find a 3.5 inch, you may as well buy it.

Guest INASNT

Guest INASNT

Posted
Posted
Originally posted by aybee

i asked an a midas exhaust place about 3.5 and he said that he didnt know of any places that had 3.5 mandrel bender. only place he thought would be a truck exhaust place. but hell, then you could go for 4 or 5 inch.

if you can find a 3.5 inch, you may as well buy it.

if u wanna go that big y bother with an exhaust at all?? just run it off the dump pipe!

Guest INASNT

Guest INASNT

Posted
Posted
Originally posted by Clint32

The problem is ground clearance under the chassis rail, fitting one 3" pipe out the side only give about 3" ground clearance, not that i would no from experiece

point is that its farking stupid driving around with anything bigger than a 3.5 inch exhaust!! + u would need ear muffs in the car from the drouning sound it would make

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