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Non BB turbo that makes good #'s
So right now I am running a SR20 turbo at 13psi. I have no idea what rwhp I am putting out...guessing 230? Let's pretend I had a GT2560 and I upgraded to a GT3071. If I'm not mistaken the 3071 would make more power with less boost compared to the 2560. My question is, what non ball bearing turbo could I upgrade to from my SR20 that would have this effect? I has to have the same footprint and also fit my turbine elbow. I would like to find a turbo that is pretty common and make a safe amount of power (250-280) on 12psi. If I did this, I should still be able to use my 460's, right?
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You could always put on a T28 from an S14 or S15 SR20... They are good for ~300HP @ 18psi. The early S14 (Zenki) T28's were journal bearing, but the late S14 (Kouki) and S15 T28's were ball-bearing.
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I actually was looking for one of those, cause I'm pretty sure that CHRA will swap directly into my turbine. I don't want to run 18psi though. I basically want to leave my car setup the way it is, but if I could change the CHRA and compressor, and make more power just by doin that, then I'm game.
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Here are the specs on all of the SR20DET turbochargers from 240SXForums.com where I'm a moderator. The guy who posted it is a good friend of mine and is very knowledgable about the content at hand:
Originally Posted by 240-kid
(Post 789824)
I have seen Many threads asking whats the spec's of the stock turbo's and what they are rated at so....
Note: The HP ratings are w/ Fully Stock Motors S13 Red-Top T25: Compressor: T-25, 60 trim 56mm 0.60 A/R BCI-1 compressor. Turbine: T-25, 62 trim 53.8mm 0.64 A/R turbine housing. Stock Boost: 7 psi Safe Boost: > 13-15 psi After that The Turbo is past it's efficiency Max Boost: 17 psi HP Ratings: 240 - 250 RWHP Type of Bearings: Journal Bearing S13 Black-Top T25: Compressor: T-25, 60 trim 56mm 0.60 A/R BCI-1 compressor. Turbine: T-25, 62 trim 53.8mm 0.64 A/R turbine housing. Stock Boost: 7 psi Safe Boost: > 13-15 psi After that The Turbo is past it's efficiency Max Boost: 17 psi HP Ratings: 240 - 250 RWHP Type of Bearings: Journal Bearing S14 Zenki (1993-96) Black-Top T28: Compressor: T-28, 60 trim 60 mm 0.60 A/R BCI-1 compressor in T-04B housing Turbine: T-25, 62 trim 53.8mm 0.64 A/R turbine housing. Stock Boost: 7 psi Safe Boost: > 13-15 psi After that The Turbo is past it's efficiency Max Boost: 17 psi HP Ratings: 250 - 260 RWHP Type of Bearings: Journal Bering S14 Kouki (1996-98) Black-Top T28: Compressor: T-28, 60 trim 60 mm 0.60 A/R BCI-1 compressor in T-04B housing Turbine: T-25, 62 trim 53.8mm 0.64 A/R turbine housing. Stock Boost: 7 psi Safe Boost: > 13-15 psi After that The Turbo is past it's efficiency Max Boost: 17 psi HP Ratings: 255 - 265 RWHP Type of Bearings: Ball Bearing S15 Black-Top T28: Compressor: T-28, 60 trim 60 mm 0.64 A/R BCI-1 compressor in T-04B housing Turbine: T-25, 62 trim 53.8mm 0.60 A/R turbine housing, Inconel Turbine Wheel. Stock Boost: 7 psi Safe Boost: > 15 - 18 psi After that The Turbo is past it's efficiency Max Boost: 20 psi HP Ratings: Approx. 300 RWHP MAX Type of Bearings: Ball Bearing N14 GTi-R (1990-94) T28: Compressor: T3 Super-60, 60 trim 60mm 0.60 A/R BCI-1 compressor. Turbine: T-25, 79 trim 53.8mm 0.86 A/R turbine housing, Inconel Turbine Wheel. Stock Boost: 7 psi Safe Boost: > 13-15 psi After that The Turbo is past it's efficiency Max Boost: 17 psi HP Ratings: 290 - 300 RWHP Type of Bearings: Journal Bearing Upgrades: Replace compressor Housing w/ S14 T28 and Max RWHP can be bumped upto 320 Updated: 1/11/09 |
That N14 T28 is what I am looking towards, except the turbine is different. The one I have now is from an S13 Red or Black top. If I changed the CHRA and compressor to the one from the S14 Zenki, I wouldn't gain a whole lot of hp. So let me rephrase my question: What journal bearing turbo (biggest one that shares my FM manifold footprint) would make the most power, say 275hp at under 14psi?
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According to the BSFC calulations from the DIY sticky, the 460s max out at 255 HP. Someone else please check my math - it's early.
255 x .55 / 4 x .8 = 140 / 3.2 = 43.8 lb/hr x 10.5 = 460cc |
The Pulsar GTi-R T28 shares the same T2 footprint on the turbine housing as your T25 you currently have. You would just have to buy the entire turbo rather than the compressor housing and CHRA seperately...
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Originally Posted by Cpt_Slow
(Post 396617)
According to the BSFC calulations from the DIY sticky, the 460s max out at 255 HP. Someone else please check my math - it's early.
255 x .55 / 4 x .8 = 140 / 3.2 = 43.8 lb/hr x 10.5 = 460cc New flow rate = SQRT(New Fuel Pressure/Base Fuel Pressure) * Rated injector flow rate SQRT = Square Root New Fuel Pressure = Fuel pressure after FPR has adjusted based on PSI of boost Base Fuel Pressure = baseline fuel pressure without boost Good luck! |
True story, but most people running MS opt not to have a rising rate FPR and just run the bigger injectors.
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This is true... If that is indeed the case, you are correct on your calculation.
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I run a rising RRFPR with my 460s for a few reasons, the main one being because it was cheaper than upgrading to 550s. Now I have an extra set of 550s and I'm still gonna keep the 460s in.
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Paul is right... It really just depends on your personal preference on how you want to do injectors and such. I myself plan to run an Aeromotive A1000 FPR with my setup with a 1:1 increase. Should keep me out of the 1000cc injector range, for now...
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