Please Help ! ! WHAT THE HELL IS IT ! ! ! ! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

TheSnail · 03-04-2004, 12:01 AM

Hey Guys, I Just bought a new GT25 Turbo, and Im confused on what size it is. I know I just confused you, just let me explain. The turbo’s product # is 705330-0002 and everywhere on goggle says that it is a .70 A/R with a .86 turbine, but mine says .50 A/R with a .86 turbine side. It has been bugging me. I asked my friend and he said that it was a 70A/R since it was in decimals??? I don’t know what I have now, am I just missing something obvious? I am guessing it is a 2840, and not a strait up t04. Maybe I am way off I just have not asked anyone else other then my friend that was talking about decimals. This might confuse you, but I bought the turbo from a guy that bought it for a WRX, and the guys that he bought it from send him the wrong turbo, so he did not even know the flange size, and just gave dimensions to the hundredths place. He gave the part number, and when I typed it in, all I got was sr20det applications, which are good, but the only compressor A/R says 50. AHHHHH! ! ! What the hell is it! The rated hp for the supposed turbo is 440 and a max of 500, so if it is a 2840 I’m guessing it is good for 350? 350hp not bad either I just cant stand not knowing what it is. The turbo itself is great, I can blow on it and the blades spin, or I can hold the turbo horizontally and twist it and the blades stay where they are, if you understand what I’m talking. Here are a bunch of pictures, please help me out so I can get sleep at night.

-Voya

*Jeff240sx* · 03-04-2004, 12:04 AM

Quote:

Originally Posted by TheSnail

-Voya

Take the turbo apart and get some Verneer (Vermeer?) Calipers and measure the blade diameters.
Looks like a big T4 (60-1 maybe) compressor and t3 turbine.. but I don't know HKS.. just comparing.
-Jeff

kandyflip445 · 03-04-2004, 12:06 AM

It's vernier IIRC.

TheSnail · 03-04-2004, 12:10 AM

Thanks Jeff, I had to clock the turbo when I got it, but I dont know about taking the whole compressor housing off. I dont want to screw up any sort of balancing, if that could screw things up?

*Jeff240sx* · 03-04-2004, 12:42 AM

Quote:

Originally Posted by TheSnail

Thanks Jeff, I had to clock the turbo when I got it, but I dont know about taking the whole compressor housing off. I dont want to screw up any sort of balancing, if that could screw things up?

No.. just be extremely careful with pulling off the housing to not hit the blades (taps are ok). Then carefully measure the blades, and go to a site (HKS website probably has them) that has inducer/exducer specs and corresponding trims.
-Jeff

03-04-2004, 12:01 AM	#1
TheSnail Nissanaholic! Join Date: Jan 2004 Location: Marietta Georgia Age: 42 Posts: 2,434 Trader Rating: (0) Feedback Score: 0 reviews	What turbo is this ? ? ? ? Hey Guys, I Just bought a new GT25 Turbo, and Im confused on what size it is. I know I just confused you, just let me explain. The turbo’s product # is 705330-0002 and everywhere on goggle says that it is a .70 A/R with a .86 turbine, but mine says .50 A/R with a .86 turbine side. It has been bugging me. I asked my friend and he said that it was a 70A/R since it was in decimals??? I don’t know what I have now, am I just missing something obvious? I am guessing it is a 2840, and not a strait up t04. Maybe I am way off I just have not asked anyone else other then my friend that was talking about decimals. This might confuse you, but I bought the turbo from a guy that bought it for a WRX, and the guys that he bought it from send him the wrong turbo, so he did not even know the flange size, and just gave dimensions to the hundredths place. He gave the part number, and when I typed it in, all I got was sr20det applications, which are good, but the only compressor A/R says 50. AHHHHH! ! ! What the hell is it! The rated hp for the supposed turbo is 440 and a max of 500, so if it is a 2840 I’m guessing it is good for 350? 350hp not bad either I just cant stand not knowing what it is. The turbo itself is great, I can blow on it and the blades spin, or I can hold the turbo horizontally and twist it and the blades stay where they are, if you understand what I’m talking. Here are a bunch of pictures, please help me out so I can get sleep at night. -Voya Last edited by TheSnail; 03-04-2004 at 11:32 PM..

03-04-2004, 12:06 AM	#3
kandyflip445 Post Whore! Join Date: Sep 2002 Location: Arden, NC Age: 40 Posts: 4,460 Trader Rating: (1) Rides Gallery: kandyflip445 Feedback Score: 1 reviews	It's vernier IIRC. __________________ My 240 vBgarage

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03-04-2004, 12:10 AM	#4
TheSnail Nissanaholic! Join Date: Jan 2004 Location: Marietta Georgia Age: 42 Posts: 2,434 Trader Rating: (0) Feedback Score: 0 reviews	Thanks Jeff, I had to clock the turbo when I got it, but I dont know about taking the whole compressor housing off. I dont want to screw up any sort of balancing, if that could screw things up?