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Old 09-10-2005, 05:05 PM   #1
012.5RS
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Default Aftermarket turbo setup

I was wondering who makes after market turbo setups for the EJ25 (i think thats the engine code, still not used to the car yet) engine. Its a 01 2.5 RS 5spd. I wanna turbo charge it but not sure where to go, not too much boost just 15-20lbs. Also ive heard the older preza's had a had gasket problem. does my 01 and if so how can i fix it. The engine has 83k miles on it. I figure ill have to rebuild it, so i plan on going with forged pistons and rods. any info you could give would be a help. I'd perfer a bolt on kit as opposed to pieceing one together.
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Old 09-10-2005, 05:43 PM   #2
EarlQHan
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15-20lbs of boost is pretty high, you're probably looking to do 10lbs or less (most likely 7-8) with stock internals and such. Remember, just because RB26s, 4G63s, 2JZs can handle that much boost with the stock bottom end, it doesn't mean any old motor can. Before you just jump into turbocharging headfirst, make sure you know what application you're using your car for, and plan accordingly and carefully. Often times turbocharging your car is not as easy as people make it sound. There are many hidden costs. I don't know which companies make aftermarket turbo kits for the 2.5 RS, but when looking for a complete kit, you'll most likely need: larger fuel pump + injectors, turbo (properly sized for your application, not the biggest nor highest HP rating), manifold, intercooler + tubing, BOV + hotpipe, exhaust, some EMS or AFC, boost gauge. Other good upgrades: clutch, spark plugs + wires, ignition, intake and other misc. stuff. So plan what you want to use your car for i.e.: fun daily driver, autocross, track, drag, a combination of choices, then plan how much power you want and then find the parts to make it happen. Also, with the price of all those parts together, compare it with the price of an EJ20 (USDM WRX, JDM WRX or STi) swap. A benefit will probably be, they will have a stronger tranny than your 2.5 RS, but don't quote me on it, because I really don't know much about the GC8s.

But good luck to you and have fun modifying your car!
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Old 09-10-2005, 06:59 PM   #3
kgb
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Ever thought about swapping the whole engine and harness? AVO and FAT, with RalliTEK still in R&D. Gasket shouldn't be a problem, but boosting 15psi will be - with 10:1 compression, without any upgrade in fueling, 5-6psi max. Might want to show all the threads for the last year and read them because a lot of people asks the same thing. Searching may or may not bring the best thread, but reading all the collective threads will give you some idea whether to proceed or not
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Old 09-10-2005, 07:20 PM   #4
Kawikid20o2
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Yea ya know the CR is a bit high on that motor for over 10psi without a very very good tune. Im running 6psi on my EJ22 and my CR is 9.5:1 so im just trying to play it safe and have a little fun. I do not suggest pushing that motor to the limit but if you must, i suggest you get some forged pistons and rods and a thicker metal Head Gasket to drop the compression or else the motor will be toast. Definitly do a search there is a boatload of info on this topic not only on engine builds but on tuning the FI NA motor.
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Old 09-10-2005, 08:20 PM   #5
Tats
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Quote:
not too much boost just 15-20lbs
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Old 09-11-2005, 04:08 PM   #6
012.5RS
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im glad i could ammuse you tats, this is my first import and everyone i talk to consideres 20lbs average. On the old V8's I build 10psi is normally the max you need or even want. I wasnt planning on using stock internals, i was planning on forged. I dont wanna do a engine swap on a new import since theyre is sooooo much wiring and all and im an old school motor head. I plan on just spirited driving and the eventual 1/4 mile run. I only want probably 275-300 crank hp. Is that a lot for these engines... once again im used to old school Pontiac V8's where 550hp and 600ft-lbs of TQ is average.
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Old 09-11-2005, 05:53 PM   #7
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20psi on a motor that is built for boost is one thing but over 5psi on one that isnt, is considered a big risk around these parts. If you build it up then i could see you pushing 12-15 without major DET problems. A good kit will cost over 4K and then you still have to consider the work you have to do building up the motor and frame mods. For very close to that cost you could swap in a EJ20 set up and have something really reliable and fun. You'll also be able to hit that target hp range you just mentioned.
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Old 09-11-2005, 07:11 PM   #8
Tats
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Quote:
Originally Posted by 012.5RS
im glad i could ammuse you tats, this is my first import and everyone i talk to consideres 20lbs average. On the old V8's I build 10psi is normally the max you need or even want. I wasnt planning on using stock internals, i was planning on forged. I dont wanna do a engine swap on a new import since theyre is sooooo much wiring and all and im an old school motor head. I plan on just spirited driving and the eventual 1/4 mile run. I only want probably 275-300 crank hp. Is that a lot for these engines... once again im used to old school Pontiac V8's where 550hp and 600ft-lbs of TQ is average.
I'm sorry..but even on factory turbo motors 20 psi is NOT average.

STOCK boost levels:

Mitsu Eclipse- 11psi
WRX- 13.5psi
WRX STi-14.5psi
R33 Skyline GT-R- 11.95psi, R34- 13.23psi
VW/Audi 1.8T- ~7psi
FD RX7- 10psi
MKIV TT Supra- ~10psi

About the only one close to 20 psi is:
EVO- 19psi

BTW...7-8psi with a kit on a factory 2.5rs will net you the +- 275 crank hp you want.

Ergo.....eveyone you talked to that said 20psi is average has no idea what they are talking about.

Last edited by Tats; 09-11-2005 at 08:21 PM.
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