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I have a mate who is selling a garret GT30r interally wastegated turbo. it has a .63 exhaust housing .7 front and a 560hp rating. I was wondering what power this would make and how laggy it would be on a rb25 that has fmic, powerfc, fuel pump and 550cc injetors as i am thinking about buying it.

thanks

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I have a mate who is selling a garret GT30r interally wastegated turbo. it has a .63 exhaust housing .7 front and a 560hp rating. I was wondering what power this would  make and how laggy it would be on a rb25 that has fmic, powerfc, fuel pump and 550cc injetors as i am thinking about buying it.

thanks

I'm about to do the exact same thing

I have 96 model with fmic, full exhaust, intake, PowerFC, Fuel pump

Just got a VG30 exhaust housing (.63) to put on a brand new GT30 Compressor and core.

Should be at full boost at about 3500rpm.

All I need is injectors.

What kind of injectors do you have? Are they high or low impedance?

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need more info is it modded internal...?  

if not 560hp turbo on a rb25det will be very laggy!  "est boost at 5-6rpm maybe".

a GT30 with a .63 rear housing will be on by 4000rpm

My advice would be aim for a .82 rear as a .63 will make it very "snappy" comnig onto boost which isnt good for traction

Matt, why do you have an RB25 :confused:

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I had a GT30 o.82 rear on an RB20 and it had full boost by 4200rpm. Boost by 5 or 6 is bullshit. Id give the 0.63 a miss and go the 0.82; it'd be well suited to an RB25

saun- what mods do you have? my gt30 has a .63 rear and my rb20 doesn't have full boost that early

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hey guys im also about to slap one onto my r33, i was told that it wouldnt be too laggy, about 4000rpm full boost.

if you think 4000 is too laggy... wow...

Mine with a .82 rear is all on by 4200. Stock head that is.

Still have nearly 4000rpm worth to use.

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if its any help ive got one on my rb25 , starts making boost from2300/2500rpm and full boost by 3500rpm. so probably add another 500rpm for rb20 maybe.

Edit:

I have just read your gt30 thread.

.70 comp and .63 exhaust housing

That is why your making the power so early.For a moment there i thougt it was the .82 and i was wondering why you were making the power on average 500+rpm earlier than others with rb25.

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saun- what mods do you have? my gt30 has a .63 rear and my rb20 doesn't have full boost that early

I had a Tial 35mm external wastegate plumbed into the modified standard manifold. Worked well too, but 0.63 would have been better on the RB20.

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it should kick in about 4500rpm and ive seen people get over 260rwkw with the mods you have

my friend has a standard internal rb25 making 343rwkw with a gt35r/106.

its a huge rear housing for a 2.5l engine but it makes 25psi by 4500rpm. i suspect the gt30 with .63 will be at 25 psi by about 3500rpm

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my friend has a standard internal rb25 making 343rwkw with a gt35r/106.

its a huge rear housing for a 2.5l engine but it makes 25psi by 4500rpm. i suspect the gt30 with .63 will be at 25 psi by about 3500rpm

Thats got to be harsh on the stock internals....

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