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Old 06-30-2005, 03:51 PM   #1
Caplin 2.5
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Default Simple RS turbo kit question

I have a pretty simple question about what needs to be done to be able to run more boost on a Turboed RS. What would I need to be able to run atleast 14psi daily driver on a turbocharged RS? Just Short block? Or would I need the entire Short block assembly?(pistons, crank etc.)
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Old 06-30-2005, 04:23 PM   #2
Fernely
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Good engine management, fuel pump, injectors and a way to lower your compression.
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Old 06-30-2005, 04:41 PM   #3
PHATsuby
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short block is the pistons, rods, crank assembly, and if you want to run 14psi daily yea you might want a sti one, otherwise you need very good tuning, which you do with the sti block but even more so on a stock block.

Ben
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Old 06-30-2005, 05:22 PM   #4
Caplin 2.5
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Quote:
Originally Posted by Fernely
Good engine management, fuel pump, injectors and a way to lower your compression.
The Forced Air Tech stage 2 kit comes with all those cept for a way to lower your compression ratio, but from what the guy at FAT said it seems as if a high compression motor combined with Forced induction makes less turbo lag. He said the turbo kit combined with the high CR of the RS will allow full boost at 2500rpms, but again bad for some reliability I guess.

So let me clarify here. I would need a short block assmembly or can I just get an STi block and run 14 psi?

Would I even feel a difference if i had 7psi on a 10.2:1 CR motor as opposed to 14 psi on a 9:1 CR motor?

I needa make sure how to be able to run a Turbocharged RS good. I fell in love with turbochargers last night after driving my friends STi.
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Old 06-30-2005, 10:57 PM   #5
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the new AVO kit is astonishing in the way on engine management. Look into it. rallitek.com

expensive, but you are getting better drivability and room for exoansion in the em than 90% of RSts out there. If you are looking for a kit that offers the expandibility to go to higher boost with the EM it ships with, check it out.
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Old 07-01-2005, 12:09 PM   #6
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Quote:
Originally Posted by Caplin 2.5
The Forced Air Tech stage 2 kit comes with all those cept for a way to lower your compression ratio, but from what the guy at FAT said it seems as if a high compression motor combined with Forced induction makes less turbo lag. He said the turbo kit combined with the high CR of the RS will allow full boost at 2500rpms, but again bad for some reliability I guess.

So let me clarify here. I would need a short block assmembly or can I just get an STi block and run 14 psi?

Would I even feel a difference if i had 7psi on a 10.2:1 CR motor as opposed to 14 psi on a 9:1 CR motor?

I needa make sure how to be able to run a Turbocharged RS good. I fell in love with turbochargers last night after driving my friends STi.
First off...7psi in an RS is very quick. Can't see a need for 14psi.

Second.....when I went from my RS EJ25 to my STi EJ257. 7psi was WAY different . MUCH less power with the EJ257 at the same boost.

Third....you can run 7psi all day every day on an RS (with a GOOD tune) and not have to worry about reliability. Unless you beat the piss out of it of course.

Fourth...as long as the boost bug don't get too big....the AVO kit is a good reliable kit...albiet a lil' pricy.
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Old 07-01-2005, 12:16 PM   #7
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would everyone agree that it is safe to run the FAT stage 1 kit at like 5 Psi just to get some higher HP gains and be turboed? cuz i really just want a turbo. but i dont wanna blow my engine. Reliability is key.
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Old 07-01-2005, 02:03 PM   #8
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With all tuning being constant... the more boost the shorter your motor will live, period. With that said, you can run 7 psi "reliably" and you can run 12 psi "reliably". Just expect things to fail faster at 12.

And just so you know, people running 7 psi on stock EJ25s tend to see about 215-225 hp atw depending on tuning. That's around 100 over stock... more than enough if you ask me. 7 psi puts you right there next to a stock SRT-4 with a bad driver.

-Brett
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Old 07-01-2005, 05:13 PM   #9
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Actually I talked to a guy from Crawford Performance and he said they ran an RS-T On stock internals at 10psi with no problems for 2 years, and made 250whp. I guess thats what I will do. Right now though he said the RS has an s2 block with v7 heads and is making 350whp. Thats somewhat along the lines I think I will follow.

Hope I can get that much hp

Also 225ish whp on an RS if you think about it would pretty much haul ass. It will have full boost at 2500rpms, it has a 4.11 final drive ratio, pretty lightweight, and the lovely 50/50 split AWD. Some stock STi's dyno in at 240-250whp isn't that correct? and if a stock WRX hits 60 in 5 seconds with 190whp, i'm pretty sure a 225whp RS will be inbetween a WRX and STi.
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