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04-21-2004, 07:15 PM | #1 |
Scooby Specialist
Member#: 54052
Join Date: Feb 2004
Location: Auckland, NZ
Vehicle:2005 Spec C Type RA WRC Blue |
Do I need a Cold Air Intake?
I have an MY03 JDM STI (2.0L with VF37 twin scroll turbo) and have the following modifications that I'm going to install soon:
- 70mm downpipe - 70mm - 80mm catback exhaust - TurboXS UTEC - Currently has aftermarket filter in stock air box In stock form, the JDM STI runs 17psi at 4000rpm, dropping down to 14psi at 8000rpm redline. My goal is to get 19psi across the entire rev range. My question is, with the above mods, is there any point in getting a CAI and aftermarket BOV (i.e. will I get more than 3HP with the CAI and can the stock BOV handle 19PSI)? Or is my aftermarket filter in the stock air box and BOV sufficient?
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04-21-2004, 07:39 PM | #2 |
Top Scoob 019
Member#: 43630
Join Date: Sep 2003
Location: Down Under
Vehicle:2004 GT40R-built 2.5 604 whp @1.8 BAR on VP109 |
dude,
these questions have been answered before. but briefly CAI dose not benefit subaru engines much at all. they cause the car to run leaner only used when u have an aftermarket ecu. stock blowoff can handle round 1.3-.14bar. i rekon wot u have there currently will be fine for ur setup. |
04-21-2004, 07:57 PM | #3 |
Scooby Specialist
Member#: 11571
Join Date: Oct 2001
Chapter/Region:
RMIC
Location: Park City, UT
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yep, you don't need either
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04-21-2004, 09:44 PM | #4 |
Scooby Specialist
Member#: 25693
Join Date: Oct 2002
Location: Portland, Or
Vehicle:2008 18x9" goodness E85-380ftlbs @ 3100 |
If you are going to run only 19 psi you will not gain power with a CAI. The over sized MAF CAI becomes useful if you want to run a FMIC, or if you are making big power and running out of resolution of the MAF. With the stock IC and 19 PSI you are not going to qualify as NEEDING a CAI that is over sized. A stock sized one is useless unless you need to route a FMIC through the inner fender.
It pains me to tell you that some what, but I would rather you buy one becuase you need one, not because you thought you needed one. |
04-21-2004, 10:10 PM | #5 |
Scooby Specialist
Member#: 10507
Join Date: Sep 2001
Vehicle:'04 Ex STi Owner '97 4Runner |
I personnally would recommend a CAI, but make sure it is properly setup - tuned for, gets proper air flow, etc. I would recommend the APS 65mm unit. A CAI will have less pressure drop then the stock pieces it replaces, and give a marginally cooler intake charge (but much cooler than a short ram). This means your turbo and intercooler don't have work as hard, and you gain headroom on your setup.
Skip the BOV. Don't try to run 19 pis to redline, you'll probably just be blowing hot air. Kevin |
04-21-2004, 10:51 PM | #6 |
Scooby Specialist
Member#: 25693
Join Date: Oct 2002
Location: Portland, Or
Vehicle:2008 18x9" goodness E85-380ftlbs @ 3100 |
Actually I would think he could run 19 psi on a 2.0 with that turbo. Notice that he is JDM, not US.
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04-22-2004, 02:23 AM | #7 | |
Scooby Specialist
Member#: 14970
Join Date: Feb 2002
Chapter/Region:
BAIC
Location: San Jose, CA
Vehicle:1997 GF8 multi |
Quote:
Talk to Injen and their dyno sheet... thats proof (oh, aswell as every major manufacturers car having a CAI on there cars, oh and the racing cars, and my car) In short, they work quiet well, and most people are easy diverted away from them by other idiots. Rich |
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04-22-2004, 02:50 AM | #8 | |
Scooby Newbie
Member#: 58442
Join Date: Mar 2004
Location: Washington State
Vehicle:1975 911 undecided |
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04-22-2004, 04:30 AM | #9 |
Top Scoob 019
Member#: 43630
Join Date: Sep 2003
Location: Down Under
Vehicle:2004 GT40R-built 2.5 604 whp @1.8 BAR on VP109 |
hey rich,
im not saying they dont work well, but u need the appropriate mods to go with them including an aftermarket ecu to handle the change in air flow. on sti84 setup i dont think that theres gonna be a huge benefit, i think when moving to a larger non vf series turbo the true benefit can be shown. its not ingnorance just an opinion and thats wot these forums are about. remeber also that these companies are gonna say that theres gains to be made cos they wanna sell their products. with the dyno sheet was the before and after dyno run done on the same day? was the car tied down at exactly the same load? was the temperature the same? theres a ton of factors that can influence a dyno reading and if the gains are only small then this can have a huge impact over the results. look at aps with their sr40 didnt make anywhere near the power they quoted and they had dyno sheets to prove wot they had. |
04-22-2004, 08:15 AM | #10 |
Scooby Specialist
Member#: 50287
Join Date: Dec 2003
Location: Franklin IN
Vehicle:02 WRX silver |
no
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04-22-2004, 08:26 AM | #11 |
Scooby Specialist
Member#: 54378
Join Date: Feb 2004
Chapter/Region:
South East
Location: Charlotte, NC
Vehicle:2023 WRX WRB |
If you want to beat an SRT-4, you'll need a CAI and an MBC cranked up to 24psi.
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04-22-2004, 09:26 AM | #12 | |
Scooby Specialist
Member#: 25693
Join Date: Oct 2002
Location: Portland, Or
Vehicle:2008 18x9" goodness E85-380ftlbs @ 3100 |
Quote:
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