After careful consideration I'm changing my answer to this.

 

LOL me too :P

 

That is what I was thinking of the WRXs.

Yeah do that.

 

LOL, Blurple SS owned a WRX AND an Sti! Dynocomp isn't just local, it just happens to be local. That would be like calling COBB local for the Salt Lake guys (or where ever they are), when they are also national. Cobb is just undoubtedly a more commonly known company than Dynocomp.

It is no more different than comparing GM stage 2, to Intense stages, and TAG stage 1 etc. There are different companies with different products.

 

Yeah I totally stopped caring when I quoted that post from Nasioc. You could strap a rocket engine to an STi and call it Stage 2 for all I care.

 

a quality cold air intake does not kill STI's. i recomend the Injen CAI. good sound and on a stock tune car, it ads a damn good amount of power. once tuned, with intake or with out, there is a negligable power difference that is within the relm of dyno error

bov does not = death. decreased performance where? right after a shift for a split second, and even then it is not that much of a difference in AFR's as i have logged it with a wideband o2. sure, a shitty BOV will hurt the car, but the HKS SSQV works damn good as well as the APS ones, greddy and turboxs suck. as for bad mpg, what a joke. the only way it will hurt your MPG is if you are constantly gassing it and letting off to hear the noise. other than that, no difference in mpg

i have never been in a subaru that ran shitty when it had a quality BOV.

also, IMO a stage 2 sti is any sti that is still running the stock intercooler and turbo and no form of water injection. other mods such as intake, pulleys and header dont really make that much of a difference in overall output of power so you can ad them to the car and still call it a stage 2 sti.

my roommates sti has tune, turboback exhaust, injen intake, APS top mount intercooler, ported exhaust housing, AVCR boost controller, water injection, and colder plugs

because his car has water injection and an upgraded tmic, i consider it a stage3 car, much per the guidelines of turboxs. a turboxs stage 3 wrx is a stage2 wrx(turboxs stage2 = cobb stage 2) but with an upgraded tmic or fmic in an effort to completely max out the stock turbo.

 

Dude... I put a hks ssqv bov and a k&n typhoon intake on the 2003 wrx I had and it ran like sh*t!!! I took them off and it was fine... I now have a 2006 wrx... stage 2... as we are all calling it... hahahaha... I have the Cobb Accessport and a tbe... a high flow catted downpipe from helix and an invidia catback (2006+ wrx's come without a cat in the uppipe... I know this for a fact)... sounds wonderful in my opinion. There is no way that I am putting a bov or intake on this one...

I really cannot believe that you didn't notice a difference when you put a bov or intake on... it made my car run horrible!!! I have, however, heard that the new wrx's respond better to mod's but there is still no way that I am putting a bov or intake on... just noisemakers imo... at least until you get into some serious hp numbers...

 

the intake doesn't do much for making it run like ****, but the BOV makes the car run like ****. I've seen an EVO go from 13.8 in the 1/4mi. down to 13.3 just by taking off his BOV.

 

i havent just put A bov and A intake on car

i tune as many as 2-3 sti's a week. 5 out of every 6 have an intake. only one out of mabye 30 sti's had a problem with an intake, and that was the fujita intake, never seen a problem with the injen cai or the spt intake.

i dont like the K&N typhoon intake. the newer model cars run a lot better than the 02-03's

i have seen MANY cars with bov's that have a leak because the gasket got damaged.

once again, several cars with quality bov's installed properly and no problems.

but yes i never had any problems running the HKS SSQV(turboxs valves caused problems, seen new greddy bov cause LOTS of problems) on my 04 wrx when it still had the stock ECU. i did have an early model injen cai that came on the car when i bought it used and the car ran like crap at night, so i hacked it into a short ram and the running problems went away.

the new injen intake does not have this problem.

 

I've heard countless stories of people having problems with BOV's on WRX's... maybe you are one of the lucky few? haha... but I know mine was not tuned... so if you tuned them for these intakes then I can see not having any problems with them... I just know I don't want either on my car... but to each his/her own I suppose...

 

i have a friend in my town who has a 01 triptronice wrx with over 20 grand in it...Here soon hes putting in a bigger turbo that he will run 10s on....he ran with his setup a 12.9 the last time he went to the track and everytime he kept going he ran consistently worse because he had a blown up-pipe and didnt know it....

Neway we also have a evo here in town, he has no legs(fake legs of course) and he drives it by the shifter paddle on the steering wheel that he got installed....He ran i think a 10 or high 10.....And then the guy who built his car ran it at the track ran 8 or 9 something in the quarter... Over 40 grand in the car and i believe its one of the fastest evos but im not sure so dont quote me on that....

If you wanna see it go look on streetfire....He has a couple races on there, black evo racing corvettes and all

 

CAI's don't hurt WRX/STIs at all. They aren't even that different than a ram air. I mean hell, half the ram air intakes for just about any car include heatshields, to keep the air colder, making it somewhat of a cold air intake too. The only difference is the CAI's tube is longer, and the air might be slightly colder when compared to a ram air intake w/ a heatshield, such as the SPT intake.

My roomate has the Injen CAI on his STI, and it came highly reffered by several shops including PTuning, of which one of the owners has a built WRX, and Vivid Racing, who are also a big EVO/WRX/STI name in the industry. It seems effective according to the dyno sheet, and he has had no problems with it, or any of the parts, he's had installed on his STI thus far.

As for BOV's, they aren't neccesary on a basically stock engine like my roomates, as you really only need them when you upgrade the turbo, utilize heavy tuning and make gobs of power. Buuut, with proper tuning, they won't really hurt the engine or hold it back either. Jeff (my roomate) has big motor plans for the future, so the BOV will come into play a little bit later. But for now, he can enjoy the BOV's cosmetic appeal and of course, the signature sound it makes.

 

exactly, you have heard stories

i have seen it all in person. quality bov properly installed = no problems

also, on the dyno i tune on, i saw a bone stock STI gain almost 20whp with a injen CAI, car still ran great, lots more power and it only ran a little leaner than a stock tune(stock tune pegs the dyno's afr on the rich side, so somewhere in the 9's, injen cai brought afr's to low 10's)

 

i read to the anything over 80 part and couldn't read anymore. you forum kids kill me. why drive a ss why start a race with someone why even be into the performance aspect of cars if your scared of a 3 lane "empty" road? sale you platform to someone who has a pair...

 

You can tune for anything fellas and you just might throw on a CAI that doesn't throw a code. Cobb and SPT short rams work like a champ. But some of you Cobalt guys really need to do some research. I even did the leg work for you.

http://forums.nasioc.com/forums/show...hreadid=477393

And to the tuner I have some questions. Wouldn't an AFR in the 9's cause problems with the engine? At that point wouldn't there be some gasoline squeezing by the rings? Just curious because a 9.X AFR doesn't sound safe, and it's a stock tune to boot. Do all your STi's you tune bone stock have a 9.X AFR, or are there mods already done? And do you reguallarly have customers install just a CAI or just a BOV or both? Do you retune the car for them after these mods are installed? Are your customers really pushing more than the 20 or so psi that the stock BPV handles and need the noise maker, or do they just feel better about themselves having it on there? Alot of what you're saying goes against conventional wisdom for Subies, but if it work's it works right, and conventional wisdom has been wrong before. Just curious and if you could help me out with these questions that'd be awesome.

 

bump for a responce from anytoo

 

IMO AFR's in the 9's is too rich... 10.8 - 11.5 is perfect for forced induction cars. the more power you produce, the richer you want to be, but you don't want to be too rich

 

well, the dyno i tune on only reads to 10.0 AFR, and like i said, bone stock sti's peg the dyno's afr. is it bad? all i can say to that is that subaru tuned them that way and i am pretty sure its rare for a completely stock sti to develop engine problems. so again, the only think i can definately say is that a stock sti goes richer than 10.0 afr on the dyno i tune on.

most of the sti's i tune are stage2, so they have atleast turbo back exhaust. most have intakes. many have BOV's(of all the bov's, the hks is the best, greddy rs is the worst, TXS ones are meh, etc.)

i never tell customers to get an intake or a bov, i simply tell them that if they want the parts, go for the injen cai and the HKS ssqv and that it is best to buy the parts they want, install them, then come in for tuning as it will save them some money

i tune the stage 2 sti's to 17-18psi, so the stock bpv does not need to be replaced. also, any sti with the stock turbo doesnt need an intake, but if a person wants the two parts, they can get the good ones and not hurt anything.

 

I squeezed just about as much power as I think possible with the stock turbo on my '05.

The only mods here are a 3" helix catless turboback, K$N typhoon SRI, Forge BPV, Perrin crank pulley, and a PDX protune (through an AP)- peaks at a little over 20psi in 5th... oh and 100oct leaded VP



Here's the vid weeeeeee!

 

Intakes dont kill performance. But you should probably have a professional tune the car on a WRX or STI with aftermarket intake. Generally the problem is turbulence around the MAF giving the ECU false readings another problem is pulling hot under hood temps in the intake. The stock intake is pretty capable of high horsepower.

BOV's vent pre metered air into the atmosphere and the ECU dumps in fuel thinking that air is still in the system. Thus causing a temp. rich conditions when its blowing off. This causing bogging between shifts. Some cars will run like crap, some it wont be as noticable. The stock bypass valve (BPV) is quite capable of higher boost pressures, and if you crush it a little its can take even more PSI.

Cobb's stage 2 is "Turboback exhaust + the accessport tune"...this isnt a secret. www.cobbtuning.com . Other companies will market stage 2 with different parts, "stage" is just a marketing tool. Example, I believe UTEC stage 3 (if UTEC even uses the stage name anymore) is/was turboback exhaust + upgraded TMIC + UTEC tuning. The stock STI and 06+ WRX uppipe is already catless, even though we've found there are still little gains to be had going aftermarket...

Generally an off the shelf map/tune (OTS) is very conservative to prevent engine damage. They will run somewhat rich and leave alot of power on the table, but are much safer for the engine then giving a more aggressive tune to everyone who buys the OTS map.

Tuning is the key to power in a Subaru. The ECU is VERY complicated and a tuner could spend hours upon hours making the perfect tune for a car. Generally a stage 2 STI is running 12.6-12.9's in the quarter mile. But if the car is professionally tuned you can get the stock turbo to carry you into the 11's (with an awesome driver). Its been done once by a member of the Subaru forum. I believe his mods were exhaust, MBC and header and a friend did the tuning who is a professional tuner. He ran an 11.7 @ 113 w/ 314awhp 381 awtq....pretty impressive for the stock wrinky dink STI turbo...

OP: Good job hanging with the STI. The basic stage 2 STI is putting down 271 awhp 316 awtq on a mustang dyno (heart breaker). I've seen them WAY over 300 on both on a dyno pack...

And modded STI from a roll....crazy fast...

http://s59.photobucket.com/albums/g3...thgearpull.flv