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Old 03-13-2010, 06:57 AM   #1 (permalink)
EVOtuners Member
Car: 03 EVO
Club Region: Central Canada
Registered: Mar 2010
Posts: 6
Reputation: 3ni_EVO is an unknown
Boost Psi Question.

Hello All,

I am in the process of getting my evo. its a 03 evo 8. It has cams, cam gears, upgrade intercooler, upgrade exhaust, catch can , apexi afc, boost controller, etc. looking at about 340 hp. First, just wondering what is the stock psi for this car. what is is set at? also just wondering what would be a safe boost to have it and a "thats pushing it" boost level psi. I have heard around 20 psi. is that right? is that what all you evo ERS have it set at or whats the deal. please let me know. Im curious to know, so i dont over kill my beast when i get it. Thanks any info appreciated,
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Old 08-31-2010, 07:25 PM   #2 (permalink)
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Club Region: Mid Atlantic
Registered: Feb 2010
Posts: 147
Reputation: You can trust this leader of the site
what is the point of that AFC. I guess to look cool. dont worrie you didnt put it on it came with the car lol. also with all that stuff cams, cam gears, upgrade intercooler, upgrade exhaust, catch can. you need to have that thing tuned..



What engine does my car have?
All currently produced American market evo's have the 2.0 liter 4g63 turbo motor.

How much boost is my car running stock?It depends on the year:
03-04s run 19.5psi at 3500rpm, which tapers to 16psi by 6500rpm
05-06s run 20.3psi at 3500rpm, which tapers to 17psi by 6500rpm

How big is my stock turbo?
Evo's come with different variations of the 16g turbocharger:
03-04 = 16g6 with a 9.8cm^2 turbine housing
05 = 16g6 with a 10.5cm^2 turbine housing
06 = 16g6 with a 10.5cm^2 turbine housing and larger compressor housing

What is stock fuel pressure?
43psi with the vacuun hose off and plugged.

How much does fuel pressure increase when I am boosting?
1:1 = 1psi per 1psi

What size are the stock fuel injectors?

What is the max boost on pump gas I can run?
The best answer to this is that there is no answer, and it's frankly not a good question, though it's often asked. Octane is definitely the main determining factor for how much boost you can run, but there are still many other factors, such as the mods you have, the turbo you have (differs between years)

How much boost can my stock blow off valve hold? When do I need to upgrade?
03-05 = Efficient to 13psi, but the turbo runs 19-20psi stock, so the BOV still works, but it's not optimum. It's a good idea to upgrade to a PROPER RECIRCULATING BOV (actually called a DV = diverter valve) as soon as you up the boost. It is considered a stage 1 mod on 03-05 USDM Evos
06 = Efficient to 24-25psi. No need to upgrade until running more than 25psi (requires race gas or alky injection) on the stock turbo or until you upgrade the turbo.
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Old 09-01-2010, 06:50 AM   #3 (permalink)
Car: 06 EVO
Club Region: Outside North America
Registered: Dec 2008
Posts: 366
Reputation: You can trust this leader of the site
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Agreed. I dont trust the AFC's at all, ive known some people that had it, and it shorted out on them, next thing you know, their motor has problems. Definitely get your car tuned. Im a firm beliver of ECU controlled boost and upgrading the cars stock boost solenoid. Or you can just get your typical MBC and have it tuned in by someone.

I was pushing 25 psi on my stock turbo and holding that amount of boost until close to redline. This is also with the stock 9 BOV and wastegate too.

06 GG Evo SE

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