T25 Wastegate on 12psi.... - SR20 Forum
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Old 03-28-2005, 11:03 PM   #1 (permalink)
Mr.200SX @ the dash

 
Join Date: Aug 2003
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T25 Wastegate on 12psi....

I was told by a respectable and known tech and fabricator that our T25 wastegates can't hold more than 10-11bls of boost since the hole is not big enough. I was wondering if any of you guys can prove this wrong. I currently have the T25 setup with the Greddy Profec B boost controller and it seems that my setup is having trouble holding 12lbs and on top of that there are about 2 or 3 more guys in the area in the same situation. All comments are welcome.
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Old 03-28-2005, 11:12 PM   #2 (permalink)
Enjoy the GTR Matt!

 
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Sure, I can prove it wrong.. 17.5lbs max boost, and I can run all day long at 14psi.

Blitz Type R dual stage boost controller.
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Old 03-28-2005, 11:14 PM   #3 (permalink)
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Quote:
Originally Posted by JGsnismoser
I was told by a respectable and known tech and fabricator that our T25 wastegates can't hold more than 10-11bls of boost since the hole is not big enough. I was wondering if any of you guys can prove this wrong. I currently have the T25 setup with the Greddy Profec B boost controller and it seems that my setup is having trouble holding 12lbs and on top of that there are about 2 or 3 more guys in the area in the same situation. All comments are welcome.
sometimes i hit 14-15psi in 4th or 5th gear...
i have a bb sr20det w/ z32, 72lbs inj., jgy fuel rail, jwt ecu,man boost controller, on stock wastegate.
BUT, my car is currently idling like crap(vacuum at 10-12 during idle) and i have some boost leak problems.
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Old 03-28-2005, 11:39 PM   #4 (permalink)
Honda smells > My Nissan

 
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Quote:
Originally Posted by R0b_
Sure, I can prove it wrong.. 17.5lbs max boost, and I can run all day long at 14psi.

Blitz Type R dual stage boost controller.

man at 17 psi you are throwing nothing but heat back into your motor, way past the efficiency range. even 14psi is alot for the little guy.
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Old 03-28-2005, 11:40 PM   #5 (permalink)
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The guy who told you that isn't really a tuner...

He just welds.

I'm pretty confident it holds 14-15 psi. But then again I'm a n00b.
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Old 03-28-2005, 11:48 PM   #6 (permalink)
Honda smells > My Nissan

 
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Quote:
Originally Posted by HalfBaked
The guy who told you that isn't really a tuner...

He just welds.

I'm pretty confident it holds 14-15 psi. But then again I'm a n00b.
I never said it wont hold the boost, I just made the comment its too much for a T25. Sorry I forgot I wasnt a tuner, those compressor maps must lie
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Old 03-28-2005, 11:57 PM   #7 (permalink)
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read the sig.. 11psi all day everyday! holds strong in all gears
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Old 03-29-2005, 12:58 AM   #8 (permalink)
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Quote:
Originally Posted by JGsnismoser
I was told by a respectable and known tech and fabricator that our T25 wastegates can't hold more than 10-11bls of boost since the hole is not big enough. I was wondering if any of you guys can prove this wrong.
Uh... yeah... if the hole were too small, it'd build MORE boost! Think about it. The hole is used to bypass air around the turbine wheel and not through it. The bigger the hole, the more is bypassed, the less goes through the turbine wheel, the less boost.

My boost pressure drops down to about 9-10 psi by redline because I'm trying to push 260whp through the poor little sucker
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Old 03-29-2005, 01:02 AM   #9 (permalink)
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Quote:
Originally Posted by crudinyourface
I never said it wont hold the boost, I just made the comment its too much for a T25. Sorry I forgot I wasnt a tuner, those compressor maps must lie

I'm not talking about you.

I meant the guy who told the thread starter.
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Old 03-29-2005, 01:45 AM   #10 (permalink)
Enjoy the GTR Matt!

 
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Quote:
Originally Posted by crudinyourface
man at 17 psi you are throwing nothing but heat back into your motor, way past the efficiency range. even 14psi is alot for the little guy.
Not when you have a T3 wheel installed!
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Old 03-29-2005, 09:58 AM   #11 (permalink)
Honda smells > My Nissan

 
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Quote:
Originally Posted by HalfBaked
I'm not talking about you.

I meant the guy who told the thread starter.
Understood
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Old 03-29-2005, 09:58 AM   #12 (permalink)
Honda smells > My Nissan

 
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Quote:
Originally Posted by R0b_
Not when you have a T3 wheel installed!

Ahh the t28 hybrid, I missed that. Right on bud.
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Old 03-29-2005, 06:11 PM   #13 (permalink)
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We ran 13 lbs on our T25 , with no boost controler , did the old turnbuckle setup , some reason that was the only way we could get stable boost with the exhaust off ....with a boost controler , the boost would just go crazy , way high, either 7lbs or 20 .... once we did the turnbuckle and removed the boost controler, we could get a stable 13 lbs ... but really couldnt get much more than that ...
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