Welcome to the North American Subaru Impreza Owners Club Friday March 29, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Engine Management & Tuning

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 05-12-2021, 12:21 PM   #1
GAMETIME2121
Scooby Newbie
 
Member#: 520650
Join Date: Dec 2020
Vehicle:
2007 Impreza WRX STi
Satin White Pearl

Default AccessPort Noob - EWG - Boost Setup

Hey guys,

Here's the situation:

Bought my late grandpa's '07 STi (yeah, he's a badass) with the following mods:



GoFastBits BOV
Perrin Turbo Inlet
APS 70mm Intake
4 Port Boost Solenoid (not sure what brand)
Upgraded Fuel Rails w/braided AN lines
ID1000s
Invidia Catted DP
Cobb Lightweight Crank Pully
GrimmSpeed AOS (Upgrading to Crawford Catch Can)
SnowPerformance/Lebonte Meth Injection System
Blouch Dom 3.0R
Stock Top Mount IC
AccessPort v2

I'm running 93 right now.

The Meth is not currently running and I'm having some overboost issues (spiking at about +26psi at WOT). I'm a pretty conservative driver, so I've only had the issue a couple of times and try to stay out of the boost. I have everything for my EWG setup with hopes of controlling boost correctly, and I know that I'll need a tune after the install. I'm mostly concerned about what springs to run in the TiAL MV-S 38MM in preparation for my new tune. I was assuming I should initially try to match the target boost the car is currently tuned at as it runs pretty well with the exception of the overboost, but I don't even know where to start to find that out. I have no idea how to even remotely start this endeavor.

Thoughts?

-GAMETIME
* Registered users of the site do not see these ads.
GAMETIME2121 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 05-12-2021, 03:03 PM   #2
JSR84
Scooby Specialist
 
Member#: 469585
Join Date: Jun 2017
Chapter/Region: W. Canada
Vehicle:
2009 STi
White

Default

Dude, that setup is a disaster waiting to happen.

Usually a 1 BAR spring will do the trick, but this is a question for your tuner as well as what plumbing setup he wants on the gate. Please do stay out of it until you get a it calibrated and the meth running. Running the Dom 3.0R on a factory TMIC without E or Meth is insanity. I would honestly thing about going down to a Dom 1.5 if its a street car, It'll be much more enjoyable, that Dom 3.0R is probably a dog under 5000 RPM.
JSR84 is offline   Reply With Quote
Old 05-12-2021, 03:21 PM   #3
Waddlz
Scooby Specialist
 
Member#: 395275
Join Date: Jul 2014
Chapter/Region: RMIC
Location: Fort Lupton, CO
Vehicle:
2012 STi
SWP

Default

Ask your tuner about the EWG. The first tuner i had wanted a 1 bar, and my current tuner wanted at .8 bar
Waddlz is offline   Reply With Quote
Old 05-12-2021, 03:23 PM   #4
GAMETIME2121
Scooby Newbie
 
Member#: 520650
Join Date: Dec 2020
Vehicle:
2007 Impreza WRX STi
Satin White Pearl

Default

Quote:
Originally Posted by JSR84 View Post
Dude, that setup is a disaster waiting to happen.
Yeah, I've kept an eye on the AFR and IAT but I don't push the car at all.

Quote:
Originally Posted by JSR84 View Post
Usually a 1 BAR spring will do the trick, but this is a question for your tuner as well as what plumbing setup he wants on the gate.
I'll be running an atmospheric dump off the up pipe... but If I run a 1 bar spring, that doesn't necessarily mean I'll keep the boost down to 1 bar, right?

Quote:
Originally Posted by JSR84 View Post
I would honestly thing about going down to a Dom 1.5 if its a street car, It'll be much more enjoyable, that Dom 3.0R is probably a dog under 5000 RPM.
This is my first Subaru, but I've driven a few others everywhere from stock to rotated gtx35r setups, and I feel like the response is a little laggier (definitely not a word) than I'd want in a daily, but from 3400ish, it is fun/drivable. I would obviously feel better if I could trust the boost to stay in a safe range.

I should also note that gramps did have his aggressive setup pushing 26psi with meth on the stock intercooler for a decent 1/4mile in Colorado elevation.

Last edited by GAMETIME2121; 05-12-2021 at 03:32 PM.
GAMETIME2121 is offline   Reply With Quote
Old 05-12-2021, 03:28 PM   #5
GAMETIME2121
Scooby Newbie
 
Member#: 520650
Join Date: Dec 2020
Vehicle:
2007 Impreza WRX STi
Satin White Pearl

Default

The consensus is to ask my tuner about what spring to run, but I'm more interested in figuring out what boost my current tune is set for.

Do I need AccessTuner software or something to see what my current set up is?
GAMETIME2121 is offline   Reply With Quote
Old 05-12-2021, 03:35 PM   #6
Waddlz
Scooby Specialist
 
Member#: 395275
Join Date: Jul 2014
Chapter/Region: RMIC
Location: Fort Lupton, CO
Vehicle:
2012 STi
SWP

Default

ah you're here in Colorado?

You'd really need to see the tune to know what the boost is set at. Even if you had Accesstuner race, you may not be able to open the tune.

Most tuners "lock" the tune from being accessed to protect their IP.
Waddlz is offline   Reply With Quote
Old 05-12-2021, 03:43 PM   #7
JSR84
Scooby Specialist
 
Member#: 469585
Join Date: Jun 2017
Chapter/Region: W. Canada
Vehicle:
2009 STi
White

Default

Quote:
Originally Posted by GAMETIME2121 View Post
Yeah, I've kept an eye on the AFR and IAT but I don't push the car at all.



I'll be running an atmospheric dump off the up pipe... but If I run a 1 bar spring, that doesn't necessarily mean I'll keep the boost down to 1 bar, right?



This is my first Subaru, but I've driven a few others everywhere from stock to rotated gtx35r setups, and I feel like the response is a little laggier (definitely not a word) than I'd want in a daily, but from 3400ish, it is fun/drivable. I would obviously feel better if I could trust the boost to stay in a safe range.

I should also note that gramps did have his aggressive setup pushing 26psi with meth on the stock intercooler for a decent 1/4mile in Colorado elevation.
Yes, it should if the mechanical side of the boost control system is working correctly.
JSR84 is offline   Reply With Quote
Old 05-12-2021, 03:45 PM   #8
GAMETIME2121
Scooby Newbie
 
Member#: 520650
Join Date: Dec 2020
Vehicle:
2007 Impreza WRX STi
Satin White Pearl

Default

Quote:
Originally Posted by Waddlz View Post
ah you're here in Colorado?

You'd really need to see the tune to know what the boost is set at. Even if you had Accesstuner race, you may not be able to open the tune.

Most tuners "lock" the tune from being accessed to protect their IP.
I'm from Colorado, as is the car, but I drove it down to its new home in Texas. I don't think the car misses the elevation.

Also, I was afraid that I wouldn't be able to figure out what tune the car is currently running.
GAMETIME2121 is offline   Reply With Quote
Old 05-12-2021, 03:46 PM   #9
Waddlz
Scooby Specialist
 
Member#: 395275
Join Date: Jul 2014
Chapter/Region: RMIC
Location: Fort Lupton, CO
Vehicle:
2012 STi
SWP

Default

you may be able to see "target boost" with the Accessport IIRC.
Waddlz is offline   Reply With Quote
Old 05-12-2021, 03:48 PM   #10
GAMETIME2121
Scooby Newbie
 
Member#: 520650
Join Date: Dec 2020
Vehicle:
2007 Impreza WRX STi
Satin White Pearl

Default

Quote:
Originally Posted by JSR84 View Post
Yes, it should if the mechanical side of the boost control system is working correctly.
So if I run a 1 bar spring, and the boost controller doesn't interfere, I can count on the wastegate dumping anything over 1 bar?

I'm worried that he was running a 18psi tune or something mildly conservative and the Internal wastegate/boost solenoid isn't functioning correctly.
GAMETIME2121 is offline   Reply With Quote
Old 05-12-2021, 03:50 PM   #11
GAMETIME2121
Scooby Newbie
 
Member#: 520650
Join Date: Dec 2020
Vehicle:
2007 Impreza WRX STi
Satin White Pearl

Default

Quote:
Originally Posted by Waddlz View Post
you may be able to see "target boost" with the Accessport IIRC.
Something tells me that if I could, it would only be a function on the AP v3... not this relic v2
GAMETIME2121 is offline   Reply With Quote
Old 05-12-2021, 03:56 PM   #12
GAMETIME2121
Scooby Newbie
 
Member#: 520650
Join Date: Dec 2020
Vehicle:
2007 Impreza WRX STi
Satin White Pearl

Default

I should also note that the 2 times it did overboost, the fuel cut, CEL came on, and I got a P0244 IIRC code. So I feel like the tune isn't asking for gobs of boost as it sits.
GAMETIME2121 is offline   Reply With Quote
Old 05-12-2021, 04:12 PM   #13
JSR84
Scooby Specialist
 
Member#: 469585
Join Date: Jun 2017
Chapter/Region: W. Canada
Vehicle:
2009 STi
White

Default

Quote:
Originally Posted by GAMETIME2121 View Post
So if I run a 1 bar spring, and the boost controller doesn't interfere, I can count on the wastegate dumping anything over 1 bar?

I'm worried that he was running a 18psi tune or something mildly conservative and the Internal wastegate/boost solenoid isn't functioning correctly.
Yes, if the gate is functioning correctly and is receiving a good boost reference is should limit the boost pressure to around the spring pressure.
JSR84 is offline   Reply With Quote
Old 05-12-2021, 06:27 PM   #14
GAMETIME2121
Scooby Newbie
 
Member#: 520650
Join Date: Dec 2020
Vehicle:
2007 Impreza WRX STi
Satin White Pearl

Default

So anyone have a quick how-to for viewing the map currently installed? I hooked up my AccessPort to the car and it shows "Grandpa's name - 91 tune" under View Current Map, but doesn't give me any further info. I do know that he did utilize some open source tuning when he first got the car, but I wouldn't be surprised if he fine tuned his own map, as he's a pretty avid mechanic.

Does AccessManager let me download and view current tunes?
GAMETIME2121 is offline   Reply With Quote
Old 05-12-2021, 10:55 PM   #15
subaru_gc8
Scooby Specialist
 
Member#: 29292
Join Date: Nov 2002
Chapter/Region: SCIC
Location: Orange County CA
Vehicle:
2004 WRX wagon
silver

Default

Quote:
Originally Posted by GAMETIME2121 View Post
So anyone have a quick how-to for viewing the map currently installed? I hooked up my AccessPort to the car and it shows "Grandpa's name - 91 tune" under View Current Map, but doesn't give me any further info. I do know that he did utilize some open source tuning when he first got the car, but I wouldn't be surprised if he fine tuned his own map, as he's a pretty avid mechanic.

Does AccessManager let me download and view current tunes?
no you need the racer software, and it has to be a tune that isnt locked. but I wouldnt really mess with it, it would be better to get a e tune or something like that than to mess with it yourself.
subaru_gc8 is offline   Reply With Quote
Old 05-13-2021, 12:06 AM   #16
GAMETIME2121
Scooby Newbie
 
Member#: 520650
Join Date: Dec 2020
Vehicle:
2007 Impreza WRX STi
Satin White Pearl

Default

Quote:
Originally Posted by subaru_gc8 View Post
no you need the racer software, and it has to be a tune that isnt locked. but I wouldnt really mess with it, it would be better to get a e tune or something like that than to mess with it yourself.
Ah, the Ol' premium tuner software strikes again. As frustrating as it is, I get it: I wouldn't want to give away my secret recipe either.

I think the gameplan is to throw a 1 bar spring in the wastegate, bolt it all up, and get a brand new tune with some meth protection. I'll be gentle in the meantime.

Thanks for your help, guys!
GAMETIME2121 is offline   Reply With Quote
Old 06-02-2021, 04:59 PM   #17
SCwrx85
Scooby Newbie
 
Member#: 340328
Join Date: Dec 2012
Location: Columbus, OH
Vehicle:
04 WRX
WRB

Default

A general rule of thumb for spring size is "target boost x 0.5". So if boost target is 20 psi, a 10psi spring is usually a good starting point. The CL boost control system is then tuned to achieve the desired pressure by either bleeding off or interrupting the pressure signal to the wastegate.
SCwrx85 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 08:03 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.