When I meant upgrade, I was referring to the changing the compressor wheel and porting the compressor housing. IIRC the T25 isn't that efficient, and when you do this upgrade it lessons it's efficiency. And how much power would the upgraded turbo make, wouldn't the AR still be the same as the T25? So wouldn't it still be limited in the amount of power that it would make? Sorry for the rambling, just started to write what I thought.
Originally posted by Victorious When I meant upgrade, I was referring to the changing the compressor wheel and porting the compressor housing. IIRC the T25 isn't that efficient, and when you do this upgrade it lessons it's efficiency. And how much power would the upgraded turbo make, wouldn't the AR still be the same as the T25? So wouldn't it still be limited in the amount of power that it would make? Sorry for the rambling, just started to write what I thought.
The T25 on an SR20 is more limited on the exhaust side. Upgrading the compressor side without doing anything to the turbine side won't give you much more power, just more lag and perhaps a tiny bit more peak power with a greater propensity for detonation.
The best bet is to do what seban did and get a T28 turbine and turbine housing, port and extrude hone the turbine housing and port and extrude hone your exhaust manifold. Even beter is to get a GTI-R maniolf and T28 turbo. The T28 won't fit on a bluebird maniolf because the compressor will hit on the block.
Mike
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There can only be one Icy Hot Stunta, Don't Hate.
I'm considering sending of my T25 off to be extrude honed, well the exhaust side that is. Is it worth the $70, it's not like the T25 has a lot of lag?
And I'm also considering, having it ceramic coated along with the manifold. Will this help increase performance?
Let me tell you what my goals are and what I plan on doing. I plan on running Andreas' famous bored maf 4bar setup with a T25, S3 cams, UR pulleys, HS fmic kit, 3" dp, and 3" exhaust. My goal is to get around 250whp. I know I should just get a T28, but I got a really good deal on a T25. DO you think I can reach those goals with the T25? Thanks
Originally posted by Victorious I'm considering sending of my T25 off to be extrude honed, well the exhaust side that is. Is it worth the $70, it's not like the T25 has a lot of lag?
And I'm also considering, having it ceramic coated along with the manifold. Will this help increase performance?
Let me tell you what my goals are and what I plan on doing. I plan on running Andreas' famous bored maf 4bar setup with a T25, S3 cams, UR pulleys, HS fmic kit, 3" dp, and 3" exhaust. My goal is to get around 250whp. I know I should just get a T28, but I got a really good deal on a T25. DO you think I can reach those goals with the T25? Thanks
You should port the exhaust manifold and the ehxuast housing before you send it out for extrude honing. Grind out those 4 bumps in the entrance for the turbine housing with a die grinder. Doing the exhaust makes way more difference than the compressor.
With the the mods you are chosing, you may just be able to do it although your power might start to fall of on top end. The car will run nice and snappy even if you don't quite get there.
A warning if you run the boost on your T25 much above 14-15 psi for long, the turbo thrust bearing will wear out qucikly because the T25 has so much back pressure, it loads the thrust pretty hard.
Mike
__________________
There can only be one Icy Hot Stunta, Don't Hate.
Thanks for the info
I only plan on running 10-12psi and maybe 14psi if I REALLY NEED to.
Oh yeah, one last question. I have a B14. What's the optimal tire and rim size I should run for my turbo setup. The ricer in me wants 18's. But the racer in me can't decide between 16's or 17's. I would really appreciate your impute on the rim and tire size. Thanks and Happy Holiday.
Originally posted by Victorious Thanks for the info
I only plan on running 10-12psi and maybe 14psi if I REALLY NEED to.
Oh yeah, one last question. I have a B14. What's the optimal tire and rim size I should run for my turbo setup. The ricer in me wants 18's. But the racer in me can't decide between 16's or 17's. I would really appreciate your impute on the rim and tire size. Thanks and Happy Holiday.
For performance, you can't beat a good light 15x7 inch wheel like a TE37 with a sticky soft tire like a Toyo RA-1 or for street use a Falken Proxis, Potenza SO3 or BFG KD, in 205/50-15.
As a compromise, you can get these same tires in 17" 205/40-17. Unfortunatly all of the 18" tires are not really good peformers. Plus 18's are heavy.
Mike
__________________
There can only be one Icy Hot Stunta, Don't Hate.
Originally posted by Victorious Thanks for the info
I only plan on running 10-12psi and maybe 14psi if I REALLY NEED to.
Oh yeah, one last question. I have a B14. What's the optimal tire and rim size I should run for my turbo setup. The ricer in me wants 18's. But the racer in me can't decide between 16's or 17's. I would really appreciate your impute on the rim and tire size. Thanks and Happy Holiday.
For performance, you can't beat a good light 15x7 inch wheel like a TE37 with a sticky soft tire like a Toyo RA-1 or for street use a Falken Azenis, Potenza SO3 or BFG KD, in 205/50-15.
As a compromise, you can get these same tires in 17" 205/40-17. Unfortunatly all of the 18" tires are not really good peformers. Plus 18's are heavy.
Mike
__________________
There can only be one Icy Hot Stunta, Don't Hate.
I would really appreciate your impute on the rim and tire size. Thanks and Happy Holiday.
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