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Old 01-25-2012, 10:11 AM   #1
jollyblue84
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Default Boost question

Ok so I have a 01 rs 2.5 coupe with a 95 jdm sti swap. Need to know if motor can handle 18psi. currently running 15psi
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Old 01-25-2012, 10:22 AM   #2
jayman4312
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why dont you do a ocmpression/leakdown test and you tell us if it can based off those results......
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Old 01-25-2012, 10:26 AM   #3
jollyblue84
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The motor has about 45,000 miles. Its been taken care of. What does the test do exactly?
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Old 01-25-2012, 10:37 AM   #4
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Tells the health of the motor internally... You should talk to a tuner btw.
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Old 01-25-2012, 10:39 AM   #5
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You should be talking to a tuner, NOT the internet. You don't just turn up boost on Subarus without knowing engine management, whether your motor is good, what turbo you have, knoweldge and use of air fuel ratio equipement, etc.
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Old 01-25-2012, 12:22 PM   #6
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Test it and boost it!
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Old 01-25-2012, 12:58 PM   #7
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Quote:
Originally Posted by My 05 WRX
Test it and boost it!
Lol nice!
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Old 01-25-2012, 01:07 PM   #8
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Quote:
Originally Posted by Unabomber
You should be talking to a tuner, NOT the internet. You don't just turn up boost on Subarus without knowing engine management, whether your motor is good, what turbo you have, knoweldge and use of air fuel ratio equipement, etc.
I know I should be going to a pro. But you tell me were ill find someone in texas and ill go today. Atleast call them. Im just wanting some opinions on if the motor is capable of handling the extra 3psi. If you can't answer that then I guess I'm not asking you.
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Old 01-25-2012, 01:11 PM   #9
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dont the jdm sti's boost 18-19 from the factory?
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Old 01-25-2012, 01:15 PM   #10
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It should be able to handle 18 psi at least for long enough to break something. How do you plan on increasing the boost? If you are going the MBC route, at least find out what your A/F ratios look like at 15 psi. Increase it by 0.5 psi increments at a time. Then report back when you've blown a piston.
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Old 01-25-2012, 01:15 PM   #11
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Quote:
Originally Posted by crotchbuffet
dont the jdm sti's boost 18-19 from the factory?
I couldnt tell you. This is my first subaru. I'm learning as I go. But this is a 1995 jdm sti motor.
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Old 01-25-2012, 01:26 PM   #12
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Quote:
Originally Posted by guroove
It should be able to handle 18 psi at least for long enough to break something. How do you plan on increasing the boost? If you are going the MBC route, at least find out what your A/F ratios look like at 15 psi. Increase it by 0.5 psi increments at a time. Then report back when you've blown a piston.
My turbo actuator is going out. I have 2 others in my hands. 1 allows 13psi the other 18psi. If I can use the 18psi actuator then I save $150.00. But if need be I will buy a boost controller to aset the boost lower. I'm simply wondering once again if it could handle the extra boost. But thanks everyone for being a$$es. I was told this site has respectable people but I have seen otherwise. Peace
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Old 01-25-2012, 01:36 PM   #13
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The reason why everyone is giving you a hard time is because it's nearly impossible to say whether it can handle it or not, given the age of the engine. Also keep in mind that JDM engines are made to run on higher octane fuel than we run here. Do you have any way to monitor A/F ratios, knock, and EGT?
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Old 01-25-2012, 01:47 PM   #14
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No I dont. What would be a good but lower cost way to do so?
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Old 01-27-2012, 01:01 PM   #15
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if the wastegate actuator is the reason your gonna be going to 18 psi then either buy something that can monitor data, or turbosmart just came out with an internal wastegate for subaru's that has different springs so you could just put in the 15psi spring. there's probably many other brands that offer wastegates that do the same thing sorry if giving you info. is being an a$$ then you shouldn't have asked a question.
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Old 01-27-2012, 01:20 PM   #16
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Since it's JDM, and pre-1996, I'm not sure any OBD II readers are going to work on it, so you probably need to install hard-wired gauges to read that information.
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Old 01-27-2012, 03:29 PM   #17
jollyblue84
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Quote:
Originally Posted by guroove
Since it's JDM, and pre-1996, I'm not sure any OBD II readers are going to work on it, so you probably need to install hard-wired gauges to read that information.
Hmm.. Ok any idea were a good place to get some would be?
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