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Old 09-14-2005, 09:19 AM   #1
lloydc33
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Question aftermarket turbo. What needs replaced???

I am new to this site so first off, if I am doing anyhting wrong, let me know.

I have an 02' 2.5 RS. I'm looking into a full turbo kit that can produce 9 to 18 psi. Is it necessary to replace anything such as the clutch or any transmission parts at the 9 psi setting? And if not, what do you think (yes I'm just asking for your opinion) is the highest psi setting up to 18 that the EJ25 motor can safely handle. I'm not going to be racing or any of the such, just want some more power out of the suby. Thanks!!!
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Old 09-14-2005, 09:23 AM   #2
White 2.5rs
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Old 09-14-2005, 09:28 AM   #3
PHATsuby
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this is asked quite frequently, so try a search and the FAQ section you will find answers to many of your questions.

How crazy do you want to get?

Many people will say swap, which is an option. Here is my kit I am selling, which in my opinion is the proper way to turbo the NA EJ25 and have it work well. read my thread and you will see I run 11psi daily, 18psi is possible, but probably wont last long especially if you detonate at all.
http://forums.nasioc.com/forums/showthread.php?t=805127

give us more of a idea of your desired budget and we can help more.

Ben
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Old 09-14-2005, 09:42 AM   #4
lloydc33
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Well im mainly looking to replace as little as possible on the engine, tranny, clutch, but not at the expense of destroying my engine or having an underpowered clutch. Budgetwise, I'm looking to spend as little as possible, but I will get anything necessary for the engine. Any input, thoughts, experience would be most helpful. Again I am looking to keep what I can stock due to limited budget, but I dont want to ruin my engine just to save a few hundred bucks

Last edited by lloydc33; 09-14-2005 at 10:04 AM. Reason: extra info
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Old 09-14-2005, 11:42 AM   #5
STi-Nismo Dood
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it's not neccessarily the power of your stock clutch that you should be worried about, it is how fast it gets eaten it up once you do get your turbo installed... research one step at a time and you will find your own answer on at least knowing what parts to make of your turbo kit and to do it right the first time
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Old 09-14-2005, 11:50 AM   #6
PHATsuby
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Ok, some people will differ and others have done it with less and been successful, however here are my opinions.

The NA EJ25 block can handle boost decently when turbo'd PROPERLY. this means you dont skimp on engine management, or fuel mods. Fuel is self explanatory, larger injectors, larger fuel pump, Adjustable FPR if desired(not really necessary but nice for precise control). In my opinion a stand alone ecu is needed, not only for proper control, but also for smooth operation and reliability. Lots of AFI people complain about drivability and reliability(or others say thats a reason to do a swap over AFI) but if you have a properly tuned stand alone, you should really have no issues. examples of good stand alones, Autronic(what I have, not because im trying to sell it but because it has lots of compensation logic to make it even smoother) Link Plus, Tec 2,3, Hydra is also an option but it seems to still have bugs from what i have read and heard.

once you have those things taken care of and spend what is necessary for them, you can get other used components to keep cost down, but don't skimp on engine management and get it tuned, you cannot detonate on the stock internals at 10:1

you will need a new clutch in short order with so much more power and torque, and if you drive like an idiot, also a new tranny.

I dont know how much you know about turbo systems or even turboing a car(or subarus for that matter) at 9psi on a decently sized turbo you will be equal and likely have a bit more power than a STi.

so, that should help somewhat hopefully.

Ben
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Old 09-14-2005, 01:13 PM   #7
Kawikid20o2
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there was a thread about the major causes of blown engines in RST's definitly check that out! very informative, the thread pretty much summed up that detonation was the major killer on these motors running more than 5 psi on stock internals. Dont get me wrong you can run alot more but not with out a very good tune. I dont know about hittin 18psi on that motor, doesn't sound possible on the stock CR since on 9.5:1 you cant run more than 14psi and you have 10.0:1. sorry if im repeating this, im kinda sure that someone else said something close to that but oh well.
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Old 09-14-2005, 01:15 PM   #8
lloydc33
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Thanks to all of you for this information. I will do some more research on this, now that i know what to look for and such. again thanks for all your help
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