Quick Question

Amaze · 12-02-2012, 10:17 PM

I have a 2009 STi, stock except for cobb sf intake + airbox and cobb ap stage 1 93 octane tune. I'm getting a Cobb 3" SS downpipe and Cobb 3" Catback exhaust soon. I will be getting a custom tune after installation as well. I have been told that this would technically (this could be wrong) be a stage 2 tune.

My question is, am I going to have to buy/install anything else if I install the turbo back exhaust and tune it? I know that as you go further along into modifications, some installations require other new parts to work properly, but I don't know if it would be necessary for my situation.

Thanks.

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HinshawWRX · 12-02-2012, 10:49 PM

Stage 2= Downpipe (at minimum) + tune.

With the 08+ models it seems Injector Duty Cycle is getting close to maxed at stage 2. This would mean you COULD get injectors and fuel pump for peace of mind. But if you are getting pro tuned, then what has your tuner told you?

Amaze · 12-03-2012, 12:17 AM

From what I understand I don't think I'm going to need fuel injectors, im already running rich lol

drewvdw · 12-03-2012, 12:29 AM

I don't know about the STi's, if they're the same injector size as the WRX, you'll be right at the limit.

ChefRacer · 12-03-2012, 12:33 AM

What percentage are you saying is maxed out? A lot of people think that 110 percent idc is okay on these injectors. An 08 wrx only has a td04, you should be able to stay well within the limits of the injectors for that turbo.
Now if you had an 09 with the Vf52 then upgraded injectors would make sense and definitely be on the list of might as wells

ChefRacer · 12-03-2012, 12:36 AM

Sorry I didn't read the top fully. I would recommend injectors, a fuel pump upgrade and an ebcs to get the most out of that turbo and tune

ChefRacer · 12-03-2012, 12:40 AM

But to answer your question...no nothing else would be required, those parts would just let you get the most out of your tune. It really all depends on whether you expect to be modifying the car again later b/c with the fuel/boost control upgrades you will have a lot more headway and you would get a better bang for your buck as far as paying for a tune goes. With the right boost control and fueling upgrades, you will be able to make a lot more power than a normal stage 2 tune could afford you.

12-02-2012, 10:17 PM	#1
Amaze Scooby Newbie Member#: 328550 Join Date: Aug 2012 Chapter/Region: MWSOC Location: Akron Vehicle: 2009 Impreza WRX STi Dark Grey Metallic	Quick Question I have a 2009 STi, stock except for cobb sf intake + airbox and cobb ap stage 1 93 octane tune. I'm getting a Cobb 3" SS downpipe and Cobb 3" Catback exhaust soon. I will be getting a custom tune after installation as well. I have been told that this would technically (this could be wrong) be a stage 2 tune. My question is, am I going to have to buy/install anything else if I install the turbo back exhaust and tune it? I know that as you go further along into modifications, some installations require other new parts to work properly, but I don't know if it would be necessary for my situation. Thanks. * Registered users of the site do not see these ads.

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12-02-2012, 10:49 PM	#2
HinshawWRX n00b Moderator Moderator Member#: 140114 Join Date: Feb 2007 Chapter/Region: MAIC Location: Jolly ol York of VA Vehicle: 06 18G Semi Built SGM WRX	Stage 2= Downpipe (at minimum) + tune. With the 08+ models it seems Injector Duty Cycle is getting close to maxed at stage 2. This would mean you COULD get injectors and fuel pump for peace of mind. But if you are getting pro tuned, then what has your tuner told you?

12-03-2012, 12:17 AM	#3
Amaze Scooby Newbie Member#: 328550 Join Date: Aug 2012 Chapter/Region: MWSOC Location: Akron Vehicle: 2009 Impreza WRX STi Dark Grey Metallic	From what I understand I don't think I'm going to need fuel injectors, im already running rich lol

12-03-2012, 12:29 AM	#4
drewvdw NASIOC Supporter Member#: 255776 Join Date: Aug 2010 Chapter/Region: MWSOC Location: Laramie, WY Vehicle: 2010 LR WRX MPS and PAR powered.	I don't know about the STi's, if they're the same injector size as the WRX, you'll be right at the limit.

12-03-2012, 12:33 AM	#5
ChefRacer Scooby Newbie Member#: 287000 Join Date: Jun 2011 Vehicle: 05 LGT wagon 5mt	What percentage are you saying is maxed out? A lot of people think that 110 percent idc is okay on these injectors. An 08 wrx only has a td04, you should be able to stay well within the limits of the injectors for that turbo. Now if you had an 09 with the Vf52 then upgraded injectors would make sense and definitely be on the list of might as wells

12-03-2012, 12:36 AM	#6
ChefRacer Scooby Newbie Member#: 287000 Join Date: Jun 2011 Vehicle: 05 LGT wagon 5mt	Sorry I didn't read the top fully. I would recommend injectors, a fuel pump upgrade and an ebcs to get the most out of that turbo and tune

12-03-2012, 12:40 AM	#7
ChefRacer Scooby Newbie Member#: 287000 Join Date: Jun 2011 Vehicle: 05 LGT wagon 5mt	But to answer your question...no nothing else would be required, those parts would just let you get the most out of your tune. It really all depends on whether you expect to be modifying the car again later b/c with the fuel/boost control upgrades you will have a lot more headway and you would get a better bang for your buck as far as paying for a tune goes. With the right boost control and fueling upgrades, you will be able to make a lot more power than a normal stage 2 tune could afford you.