What turbo for my RB20DET buildup?

[rb20-calais]

Guys,

I have done a lot of searching and reading but there is not much information reguarding results with GT** turbos, mostly discussion is about the HKS items.

I dont have a turbo I sold it as I was gonna do a rb25 turbo but i have decided to do the lot and have taken my car off the road.

I really want to hear your imput on the differences between the GT25/28 and different driveability. The GT25 is rated @ 400hp and I was told it will make 250kw@wheels, but @ what boost? I was looking for around 220-230kw@wheels to be daily driven and maybe wind it up a bit for the strip. I have a Wolf 3D V4 with hand controller.

To be able to fit the GT25 to my car I was quoted the following. $100 for the adapter plate welded to old manifold, $250 for 3" dump ($300) if i want a screamer and $220 for the lines(braided). Is this a good price? It was from Ricol Performance.

Any input would be greatly appreciated!

Thanx

Evan

P.S. I will have a cooler, fuel, etc to run the numbers... no comments on how its not just a turbo that will get me power

[Steve]

Evan,

I have only been in a RB20 with 2530, not 2835, so I wont comment on the latter.

the car in quesion put down about 230rwkw at 1.2 bar, came on boost quicly and pulled hard through to red line of 8200rpm. these turbos apparently hit peak efficiency at 1.5-1.7bar, so there would be a bit left. It was a drift car, so boost came on pretty hard.

With regard to fitting, the 2530 can come in a t3 form that will bolt straight up to a stock manifold (as it was on the above), so adaptor plate shouldnt be necessary. $250 seems pretty cheap for a dump. $220 for braided lines is pretty good to.

BTW, I have seen a 2530 second hand recoed, with polised comp housing and braided lines, wastegate, t3 flange for under 2k - which is cheaper than a high flow, and therefore IMO are pretty bloody good value for money.

[rb20-calais]

yeh,

I think a 2530 would be great but I am a bit sceptical buying a second hand turbo from japan. There is one at hikari for $1780 with a t3 flange although in the pic I cant see hks on the turbo so i think it is a garrett item... anyone can confirm?

2530 sounds perfect for what I want and I would buy a second hand one if the condition was known.

Evan

Evan

[rbs13]

i would go 2540.. if you want more hp later.. which im sure you will .. you could get a xtr or what ever equilavent and get them to build it to your specs.. the only real good thing about hks turbos over their garret base is that they come into their own world when boost is increased.. if you only wanna run 1.0 bar i would stick with something garret produce, the hks badge adds about 600-1000bux! you could get the same exhaust housing the 2530 uses (same size a/r ratio or what ever) and then put on a bigger compressor housing to get a quick boost response/spool up and with the bigger compressor housing it will flow a bit more at the top.. talk to a turbo specialist about your wants and needs.. you could end up happier..

[rb20-calais]

thanks for your replies!

Evan

[VLRB20DET]

I have a T3G from Japanese Motorsport in Adelaide how much kw should I get with that on a stock RB20DET?

[Steve]

If you know what trim it is, these might help:

http://www.turbofast.com.au/FlowT3.html

[VLRB20DET]

dont know Steve its a bolt on to standard manifold, and is internal wastegated, steel wheels, but ive tried bolting it on but the water connections are a different thread.

[Steve]

water connections are usually pretty easy to souce, somewhere like enzed, or pritec? (i think). Without knowing what trim the wheel is, might be a bit hard to guesstamate.

What did they tell you it was capable of when you bought it? Did they tell you it is a straight fit?

[rb20-calais]

i have opted to go with a gt25, i am undecided on if i should go the 400hp or 440hp model, i realise an adapter plate will be around $100. The 440hp model is only like $100 cheaper... but will be laggier? will the 400hp model support 250kw@wheels... i am undecided... i have been told the 440hp model will hit full boost around 3500rpm as i know someone who has one on a ca18 and it hits full boost at 4100rpm

thanx

evan

[Cubes]

You will be pushing to be hitting full boost at 3500rpm.

A RB25DET turbo hits full boost by 3500rpm, you will be most probably be looking at the positive side of 4000rpm for full boost with any turbo that makes decent power on the RB20DET.