congrats!!!
your car comes with a pretty good BOV. the only reason to change it would be to get the woosh sound.
the stock one recirculates all the air back to the intake, while aftermarket BOV's shoot the air into the atmosphere. aftermarket
if you were to get one, the GFB BOV is pretty good for our cars because half the air goes back into the intake, and half into the atmosphere. so a search on BOV's and you will get back a ton of hits regarding the subject.

 

If you want a bov that's easy to install subiedon is selling a turboxs rfl.

here's the linky

https://www.i-club.com/forums/showth...threadid=39011



:banana:

 

i couldnt disagree more. if you drive your car like a grandma you dont need a timer. if you ever go driving hard, when you stop, pop your hood and take a look at your turbo. i guarantee it will be glowing if you were really driving it. after seing that you will want a timer.

 

FHI/SOA addressed this issue as early as June 2001:

http://www.subaruwest.com/PDF_files/...1_techtips.pdf
http://www.spdusa.com/turbo_timer.htm

Due to the design of the turbo, a "cool down" procedure is not necessary. Having said that, I would never drive a car "hard" and then just park it. I always allow a mile or so of easy driving to allow all of the vehicle's components a chance to return to their normal operating temperatures.

Rexboi was spot on. FHI/SOA left it out of the manual for a reason.

- Kean

 

kean, spot on according to the manual... yes, but as you said yourself you wold never drive a car hard and park it and shut it off. I for one drive my car hard 200% of the time. so for me a timer is necessary, to maintain the life of my turbo. SOA obviously dosent think that we drive our cars hard. you can tell this just by looking at the differences between all jdm model imprezas and usdm ones. and besides, if a turbo is to go out after 36k miles, it is in their best intreset... then we have to pay for it on our dollar.

 

....I don't buy the conspiracy theory of FHI making more money from premature failures.

As for what I said, I'll reiterate. The reason I take it easy after a "hard run" is to allow ALL of the vehicle's components the chance to return to their normal operating temperatures. It has nothing to do with the turbo specifically. I do the same on a normally aspirated car. A timer is not going to help cool down your transmission, drivetrain, brakes, etc. After reading the tech bulletin and researching this topic in detail, I have found no evidence that a TT makes a difference in a modern day turbo charged Subaru. If you study the design, you'll see that the turbo continues to be cooled by a flow of coolant even after the engine is shut off.

Here's an interesting experiment I came across in my research. It's for a Forrester XT but the design is essentially the same:

http://www33.brinkster.com/cammiecam/turbo.htm

I just figure FHI/SOA engineers must know something about their own design. If people choose to ignore that fact and spend money on a turbo timer, then so be it. The only reason I post this info is so folks that are considering the purchase of one can at least make an informed decision.

- Kean

 

you dont need a turbo timer if you dont spool ur turbo up hella hard right before u shut ur engine off. if you hit full boost for long right before u turn off ur engine the oil will coke up inside the turbo (bad). i heard theres a water jacket in the stock turbo and some people say it makes us not need a turbo timer but i dunno a glowing turbo with oil sitting in place inside of it just doesnt seem like a good idea.

 

Back to the original question...

It is my understanding that unless you are going to modify boost/calibration to levels that exceed OEM settings by any significant amount, the only thing an aftermarket blow off valve is good for is sound.

By "blowing off" all turbo pressure in a stock setup, you are actually going to lose response between shifts because the turbo will require more energy (and hence, more time) to "spool up" again...

Just thought I'd add my two cents and save you money (unless you want the cool sound, of course)



Dave

 

You may want to re-read his question. He also asked about turbo timers.

Here's an excerpt from the FHI/SOA literature (from June 2001 TechTIPS published by Subaru for Subaru Technicians):

"2002MY WRX TURBO COOL DOWN PROCEDURE
FHI's posistion regarding this is that it is not necessary to perform a "cool down/idling" procedure, as was recommended with past turbo models. Our current 2.0L turbo engine has a far greater cooling capacity and, coupled with technology advances, makes this practice no longer necessary. This explains why information about cool down is not included in the 2002MY Impreza Owner's Manual.

The heat contained in the turbo charger will begin to vaporize the coolant at the turbo charger after the engine is stopped. This hot vapor will then enter the coolant reservoir tank which is the highest point of the coolant system. At the same time the vapor exits the turbo charger, coolant supplied from the right bank cylinder head flows into the turbo. This action cools the turbo charger down. This process will continue until the vaporizing action in the turbo charger has stopped or cooled down."

- Kean