Best "bang for the buck" modifications for WRX's and STi's
- Thread starter Alin
- Start date
TK-421
New member
Depends on how much boost is being run, stock car not really worth the expense, anything past stage 1 I recommend a AOS. The way the PCV system is designed is pretty poor from the get go. Adding an AOS does help, but still doesn't eliminate the problems, which is why you see most track cars/race cars/rally cars with a completely revamped PCV system. The boxer design sort of inhibits the crankcase venting like it normally would on a inline 4 or 6 cylinder. Even V8's have a slight issue with venting. But the boxer engine is the one that is plagued the most. Both subaru and Porsche have tried to correct this issue over years and years and years, but it just comes down to physics.
Adding an AOS yes it helps, is it an absolute must? No. I've seen plenty of cars with out them. Does that mean that's wrong? Absolutely not, does it mean they should put one on right away? Nope. A AOS is a bandaid at most. Just because you add an AOS doesn't mean your going to be impervious to the inherent PCV issues with in the boxer engine design.
For the prices of some of these AOS systems I've seen for sale, I'd honestly say no it's not a must have. But if you have the technological prowess to fabricate your own for under 100 bucks. I'd say go for it. Or if you have deep pockets and like to burn your money.
sacnvz
New member
I've read a lot of back and forth on the subject. I'll have to dig for it but I saw one guy posted his 15' with oil in the IC already and I think he only had around 7k miles. For grins I might pull my IC this week to see if I have anything brewing in there.
TK-421
New member
Just because you have oil in the Intercooler doesn't mean you need to dump on a AOS. That will not fix the problem.
TK-421
New member
TK-421
New member
sacnvz
New member
Gotcha! I hear ya, but it would help though right?
TK-421
New member
Not necessarily, to have oil in the Intercooler is normal, if you have puddles of oil in the Intercooler especially on a stock car, you have something else wrong, or it was beat on during the break in period. Been doing this for many years now and I have yet to see one TMIC that doesn't have some form of residue in it even with having an AOS installed.
TK-421
New member
That is one culprit yes. But there are other things as well
Alin
Diehard Car Enthusiast!
TK-421
New member
I will EVENTUALLY, I'm working on a write up right now (shhhhhh) no telling
TK-421
New member
Ohhh look at you taking charge like a big dog, you make me so proud my young apprentice
Best quot for the Buck on a GR/GV stock cars I have been reading a lot about ringland issue on the 08+: so I decided to get all the info on how to prevent it and deploy it:
1. Tune (Stock Tune is really bad and knocking even with high Octane Fuel)
2. AOS
3. Equal Length Headers
4. Water/Meth Injection (Planning)
Will see how the pistons will hold after the recommended mods.
My other Recommendation for the GR/GV (Done All):
Planning:
Carbon Fiber Drive Shaft
1. Tune (Stock Tune is really bad and knocking even with high Octane Fuel)
2. AOS
3. Equal Length Headers
4. Water/Meth Injection (Planning)
Will see how the pistons will hold after the recommended mods.
My other Recommendation for the GR/GV (Done All):
| Suspension & Bushings |
| Racecomp Engineering Yellow Lowering Springs (Must) |
| Rear Swaybar (Must) |
| Front Swaybar (Must) |
| Rear Endlinks |
| Front Lower Control Arm Brace |
| Cusco Power Brace Power Steering Rack (Must) |
| Steering Rack Bushings (Must) |
| Rear Diff Positive Power Kit Bushings (Must) |
| Gearbox Positive Shift Kit (Must) |
| Shifter Bushings Subaru (Must) |
| Rear Shifter Bushing (Must) |
| Engine & Drivetrain |
| Aftermarket Boost Solenoid (to control boost) |
| Aftermarket Internal Wastegate Actuator 7psi (to control boost) |
| Aftermarket Recirculating Blow Off Valve (to control boost) Pitch Stop Mount (MUST MUST MUST) Brake Master Cylinder Brace (Must) Transmission Mount (If you can accept the noise then its a must) |
Planning:
Carbon Fiber Drive Shaft
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