GT25 440HP on a R33GTST

[slayer]

Hi, I have been recommended by my workshop to go for a GT25 440HP turbo to achieve the horsepower I am chasing (around 320rwHP) and the 'seat of the pants' torque I am chasing.

I am not so much after a dyno comp winner, but something that comes online not too late (a litte lag is cool, like 4000-4500 for full boost) and really punches hard as I hate the stock turbo - my old WRX with a VF22 pushed MUCH harder.

Anyone used one of the GT25's (internally wastegated model) on an R33? Any comments?

I originally was thinking the GT30 with a TO4B housing, but my mechanic has done several R33s with this setup recently and is getting 320rwHP with 13PSI with stock computer (pretty awesome in my opinion!) and its not laggy.

Ta

Conrad

[rb20-calais]

hey

i am currently about to put the same turbo on my RB20 and around 320rwhp was what i am chasing also. I know a guy with one of these turbos on a CA18 that hits 1bar @ 4200rpm. I was hoping on an RB20 it would hit 1bar by 3900-4000rpm and I would expect it would hit 1bar on a rb25 by 3700rpm (this sound right?).

Anyone else put one of these turbos on a RB20/25?

Thanx

Evan

[Guest INASNT]

go for a GT30 550hp mate, u will enjoy it more in the long run

[Cool Hand Luke]

I went for a drive in a 180 with an RB25 and GT30... very impressive and suprisingly good throttle response. There was nowhere near enough lag to make me think about going smaller if it was my car, but thats just my opinion and i can put up with a bit of lag for good hp

[Guest R33GTS25T]

hks gt2530 full boost @ 3800 rpm pulls right through the gears good till 250rwkw

hks gt2835 bit bigger comes on a bit later good till 300rwkw i think...

[Guest INASNT]

Originally posted by R33GTS25T

hks gt2530 full boost @ 3800 rpm pulls right through the gears good till 250rwkw

hks gt2835 bit bigger comes on a bit later good till 300rwkw i think...

u think wrong, the 2530 is only slightly bigger than the stock turbo and will give u about 225rwkw, and no way will a 2535 give u 300rwkw.

[Guest INASNT]

Originally posted by R33GTS25T

hks gt2530 full boost @ 3800 rpm pulls right through the gears good till 250rwkw

hks gt2835 bit bigger comes on a bit later good till 300rwkw i think...

u think wrong, the 2530 is only slightly biiger than the stock turbo, and no way will a 2535 give u 300rwkw.

[Guest MFX_R33]

If you are going to go to the expense of upgrading your turbo, you may as well make it worth while, and go for the GT30. After driving the GT25 for a couple of weeks you will be, searching for more and kicking yourself that you didn't go for the bigger unit.

Jeff.

[DoughBoy]

Originally posted by MFX_R33

If you are going to go to the expense of upgrading your turbo, you may as well make it worth while, and go for the GT30. After driving the GT25 for a couple of weeks you will be, searching for more and kicking yourself that you didn't go for the bigger unit.

Jeff.

Suppose it depends alot on what people are after and what they use the vehicle for?

[Guest MFX_R33]

Basically, there is not a huge power difference from standard to the GT25. My thought is, if you are not content with the power from the standard turbo, then you wont be content for long with the GT25.

If you are only after a few more kw, then you have to ask yourself if it is worth it, or should I just be happy getting the most out fo the standard turbo (maybe just play with cam's, etc).

Jeff.

[Roy]

I am chasing (around 320rwHP) and the 'seat of the pants' torque I am chasing.

Sounds like he knows what hes after, and approx 240rwks (around 320rwhp) in my eyes is a big gain from the 180rwkw stock turbo.

[slayer]

Hmm thanks for the advice guys - will consider the GT30.

But to be honest, 320rwHP+ ( 238Kw) is pretty serious power and I understand that 260rwKw is close to the limits of a stock bottom end on an RB25 so I am not sure if the GT30 is going to give me much more expect for more lag and potentially a broken motor when I run it up to 260+rwKw..

320rwHP at 13PSI seems awesome to me - thats serious power and not insane boost, so engine longevity shouldnt be too bad. My concern with the GT30 would be it may run up to say 370rwHP, but how long would the engine stay together? This is my daily driver, I dont want it to detonate after 3 months.

Am I wrong, can the RB25 sustain more than 370rwHP safely for extended periods? If so, the GT30 is probably a better option

Good responses guys, got me thinking about the GT30...