does anyone know how hard it is to install a new manifold on an 06 sti, and if there are any proven issues with doing so? only thing done now are spt intake spt catback i'm getting invida divorced down AP 2.0 and heres what i'm thinking about and curious about what you guys think pros and cons of each would be awsome especially if you've done the mods... and what kinda gains would I see / lose from each uppipe (is this needed? I hear mixed thoughts) larger top mount or front mount (thinking fmic. just don't want to cut the crap out of the bumper) 20g turbo upgrade... ((does this bolt in with sti parts or do I need a bunch of new stuff.. and is a blowoff needed with this turbo?)) turbo manifold ((would upgrading this be any more benificial then stock?)) any other worthy mods I should be thinking about or problems I might encounter with each.... pardon my lack of knowledge... but asking the experts with experiance is far better then and companys input. and are these mods conciderd "safe" ?
well...im sure others will be able to tell you more than i could, but heres what i think. 1. Yes, uppipe is needed 2. BOV is needed with any turbo...including the 20G 3. Upgrading your exhaust manifold will help out a little bit, but from what ive heard, there is not much to be gained from there. all the masters need to come in and correct me if needed!
the only mods you will need once you get your dp and ap is injectors and a pump. Ask Mlgez. We tuned on his car a little bit after the injector install and it is a completely different car. Once you get stg2, you don't have enough gas to maximize the setup. with more gas, you will be able to run 3-5 more psi throughout the rev range. You will have more torque and hold it longer. Just seach for his stock vs stg2 vs mod stg2 thread and you can see the differences that a little tuning and some gas can do. I would hold off on the header unless you plan on adding gas. You will definitly need to pump and injectors for a 20g setup. Russ
Port and polished headers would be a good idea. Hit me up if you have any questions on it. I can also hook you up with the port and polishing, also the ceramic coating/ and or header wraping!
i heard my friend polish something of the engine or something else(forgot which part he was talkin about) would help the car gain horses?? is that ture?
Yes a ported (gasket matched) manifold and maybe even a upgraded cross pipe will help you gain hp. If you search on nasioc under ported manifold or jusgrimm manifold you will find some dyno graphs and other feedback on it. I sent you a pm to keep this post freed up
You just need to remember that on stg2 sti's and wrx's that you don't have enough fuel to maximize the setup. You would be amazed at the power that can be had by getting more fuel into the mixture. Russ
Listen to this guy ^^^^. It really needs more fuel. Lot more potential after injectors. You will run out of fuel up top w/o them. Boost is dropped because the injectors can not keep up. Stock they are maxed out on stg2. I am at 60% duty now with larger ones. Check out my thread listed below in my signature.
so do you recomend those pullys you have on your car? and have you noticed an increase with the inlet?
The pulley you probably would only notice a difference on a stock car but I could be wrong. That was one of those items that I just wanted to do something to the car so that was quick and easy and it was the first thing I did. The turbo inet I could not tell you if it made a difference because it happened the same time as the injectors and fuel pump. I would think it would help but it is an unknown. The turbo noises are louder for sure though.
around how much would a pump and injectors run? not too many more mods are gonna get done to this thing after the up/down, ap, then injectors and pump. still debating on the fmic. I also don't want to destroy the allready not so hot gas milage
Well the fuel pump you can find under $100 if you look around on the web (got mine from LegacyPGT). The injectors are another story. New I see them around $600-$700..... what I did was buy some used STi injectors ($200-$300) and had them modified and flow checked. Well actually I just traded the used ones + cash for a set that had the work already done (bikerboy has them but I forget how much they were). Let me know if you want to go that route. I will have my used stock STi's up for sale as soon as I get all the tuning done on my car.
Hit up Russ for injectors, i should have mine from him soon and for a fuel pump Josh at Import Image has the best prices ever I got mine w/ install kit for around $80 and that was the going price on ebay withouth the install kit
Yea if Russ starts doing STi injector mods get them from him. They will be cheaper than anywhere else I would bet. Talked to him on Friday though and it sounded like he was still just doing WRX injectors.
IMO you don't know enough about your car to move to the level of modifications you're thinking about. you need to move alittle slower and learn more before you start throwing on things you've heard of like "20G" and "blow off valve" and you don't even have any regard to how to match other components to match. Just either very closely copy the setup of someone else who has put the thought into it or just wait until you can understand why you;re doing what to your car beyond "pay money to make faster" if gas mileage is even a consideration for you remember you're putting in a big fuel pump, bigger fuel injectors and a large turbo. you are enhancing the ability of your car to consume gas.
the stock 'BOV' which is actually a diverter valve can hold about 20-21psi, so that would not be necessary unless you plan on pushing those numbers, I agree with esperunit, you need to slow down, and LEARN, it takes a while and the teachers are great:biggrin: , so relax-get your ap and exhaust AND downpipe if you must and tune and PLAY-then really see if you need that extra power- and never under any circumstances assume that once you bought all the parts you need that you won't be spending a bazillion more dollars(a bazillion's a lot!) and for god's sake don't buy a pulley>>> read the warning from the company (I actually pulled this off the site) Note: The factory crank pulley incorporates a harmonic dampener, and the billet aluminum pulley does not. Removing the harmonic dampener may have an effect on the lifespan of the engine.
uppipes aren't needed as they are catless from factory. People with 02-05 WRX replace their uppipes because there is a cat on it. Not only does the cat restricts it, through time the cat falls apart and it's particles can go into the turbo damaging it. So to answer your Q, no an uppipe is not needed. a FMIC would also be IDEAL with the setup you plan to run. A TMIC loses it's ability to work well when it comes to big power. It just doesnt get enough air flowing through it. big turbos are fun. =D nuff said! as for aftermarket headers, there was a dyno sheet not too long ago with comparisons. If it's not an equal length header, you really won't see much gain at all with it. but as other's said, slow the process down if you really have on idea what you're doing to the car. It is a good thing though that you are asking questions too. so just keep learning more as you go before you decide to take big steps in modding.
actually that is for a transversely mounted inline four or v style motor. Boxers don't sure harmonic balancers, the pulley is just a pulley. not that changing it helps much but it does slightly reduce the amount of rotating mass from the crankshaft. If I were loking to build a fast car this would be jsut about one of the last things on my list. The only reason they're even common is because ST) classes for SCCA allows them, and people there will pay money for any advantage, no matter how slight. Even SOA reps have backed this up, search NASIOC.
don't get me wrong guys, i'm not dumping a bunch of crap into the car without thought.... thats why i'm posting the majority of this. I have untill spring and most of the summer to work on the car. right now I'm throwing out the general planned list and hearing what works, doesn't work, and the effort it takes to make such item work..... the down and 2.0 ap are certain.... the rest is all thoughts. I'm curious what works for others any why. I'm not shouting blind ideas without some research.... but the best research is straight from the source of those who have done / have / broken etc. with that being said it would seem that the most main common mods run in order (stop me if i'm out of order or seemingly wrong.. this is just my gatherings from the site give or take a small switch 1. exhaust 2. intake (not needed untill excess of 300whp but still common) 3. ap 4. intercooler 5. injectors / pump (tune) 6. turbo and piping (tune)
The generic and widely beloved mod path for turbocharged subarus is to replace the up and down pipes (uppipe not needed on the STi) and put on a catback exhaust, followed by some form of engine management...such as the AccessPort. This is commonly referred to Stage 2. And is usually a pretty good bang for the buck setup for most people. At that level of tune, if you haven't done so already, some sort of suspension work should be done to keep you inside the stripes. Springs and rear swaybars are the norm at this point. At this point, the STi and WRX are pretty balanced cars. Good amount of power, good amount of handling. When considering turbo upgrades and power mods, you need to have a goal in mind. What is your goal for this car? What do you intend to do with it? Great, a 20G turbo will net you 320whp on pump 93, but to what end? What purpose do you have for 320whp, and more importantly, what kind of powerband does your overall goal require? Upgrading the turbo on these cars will require you to think about your fueling and cooling. You will have to worry about longevity as the power rises. Fuel costs. Things of that sort. Will the car be daily driven? Or is this your weekend car? All things you need to ask yourself when you are planning your mods. Coming up with a parts list of things to buy is the LAST thing you should do. Your first and foremost plan of action should be figuring out what you want your car to do for you. Then you research what others have done, and what parts can achieve those goals for you. Then you put together a list of parts you think will work. Then you think about how all those things go together and if they will achieve the goal you've set forth. If it all adds up, you purchase your stuff, if it doesn't add up, you start over and revise everything. Modding a car isn't like on Gran Turismo where you just slap parts on and go race. You need a goal in mind for your car. Without a goal, you are just tossing parts at a car. Which is pointless.
