What is Overboost? - EvoXForums.com - Mitsubishi Lancer Evolution X Forums
EvoXForums.com - Mitsubishi Lancer Evolution X Forums
Go Back   EvoXForums.com - Mitsubishi Lancer Evolution X Forums > Evo X > Evo X General
Home Register Forum Store Members List Calendar Auto Loans vBGarage Photo Gallery Search Today's Posts Mark Forums Read Auto EscrowInsurance

Evo X General General discussion on the 2008+ Mitsubishi Lancer Evolution X

Reply
 
Thread Tools Display Modes
Old 05-22-2010, 04:55 PM   #1
GiLizILL
aka Detsoob
 
GiLizILL's Avatar
 
Join Date: Dec 2009
iTrader: (0)
Location: San Antonio
Posts: 232
What is Overboost?

in a GSR.

How much overboost is bad?
What are the side effects of overboost?
Long term effects?
How does it effect drivability.
Etc.

I have always been a little unclear on this subject, can someone clear it up?
__________________
2010 Wicked White Evo X GSR
Rubber: Hankook Evo V12's 255/35/18
Wheels: WedSports SA-55M 18x9.5 +20 MBM
Handling: Swift Spec-R Lowering Springs
Power: Cobb AP, Cobb Downpipe, Cobb High-Flow cat, ETS v2 Exhaust
Tune: Tuned by Chris@AMS
1/4 mile time: 12.8 @ 108mph 2.0 60ft
Extras: Debadged, 5k HIDS, White LED license plate bulb, 15% tint, Vanity License plate "Proper"
GiLizILL is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 05-22-2010, 05:45 PM   #2
djmac
X-phile
 
djmac's Avatar
 
Join Date: Apr 2010
iTrader: (0)
Location: Chicago
Posts: 812
I believe (and please, correct if I am wrong) that overboost is when the turbo boosts higher than the wastegate controller is set to allow it to boost. The ECU isn't tuned to the excess boost, and therefore doesn't operate with a proper mixture for it (more than likely, at least, depending on how much over). Long term effects, it could damage components that aren't properly set up to run with that extra pressure. You probably wouldn't notice it daily driving, but it's a problem. Basically, your car is doing something it isn't prepared to do.

**note: the validity of these statements has not been verified by... well, anyone. grain of salt, please.**
__________________
2008 Evo X GSR


ARK Performance, DBA, StopTech, Injen, Enkei, APR, Apex'i, Touge Factory, Stance, Varis, Competition Clutch, Schroth, Blox, Rally Armor, TWM, Muteki


Sponsored by BTRcc / Piston Graphics.
djmac is offline   Reply With Quote Quick reply to this message
Old 05-22-2010, 06:16 PM   #3
ak47m203
Dr. Evo?
 
Join Date: Jul 2007
iTrader: (100)
Posts: 13,298
overboost, it's like a balloon put too much air it will explode. the motor has a limit. not sure how much before it will ka boom, now stock tune you will get a code when you overbooost, prevent you from ka booming your motor. custom tune it's up to the tuner if he set the limit too high.
ak47m203 is offline   Reply With Quote Quick reply to this message
Old 05-22-2010, 06:36 PM   #4
TURNITUP
Just Spooling Up
 
Join Date: Nov 2009
iTrader: (0)
Posts: 108
does this have to do with the service required code everyone gets?
__________________
Mods
Brian Crower stage 2 cams
Forge wga
Megan racing TBE
Harmon motive UICP
K&N Cone filter
AEM tru boost/AEM wideband

E-Spec Tuned : 365hp 425tq @ 30psi holding 18psi
http://i9.photobucket.com/albums/a52...espec2copy.jpg
TURNITUP is offline   Reply With Quote Quick reply to this message
Old 05-22-2010, 06:41 PM   #5
GiLizILL
aka Detsoob
 
GiLizILL's Avatar
 
Join Date: Dec 2009
iTrader: (0)
Location: San Antonio
Posts: 232
thanks for the info.

My car hits 26 sometimes 27 psi, when the stage 2 AP map is set for 25 peak.
Car seems fine. Don't know if it's a problem.
__________________
2010 Wicked White Evo X GSR
Rubber: Hankook Evo V12's 255/35/18
Wheels: WedSports SA-55M 18x9.5 +20 MBM
Handling: Swift Spec-R Lowering Springs
Power: Cobb AP, Cobb Downpipe, Cobb High-Flow cat, ETS v2 Exhaust
Tune: Tuned by Chris@AMS
1/4 mile time: 12.8 @ 108mph 2.0 60ft
Extras: Debadged, 5k HIDS, White LED license plate bulb, 15% tint, Vanity License plate "Proper"
GiLizILL is offline   Reply With Quote Quick reply to this message
Old 05-22-2010, 06:46 PM   #6
ak47m203
Dr. Evo?
 
Join Date: Jul 2007
iTrader: (100)
Posts: 13,298
Quote:
Originally Posted by Detsoob View Post
thanks for the info.

My car hits 26 sometimes 27 psi, when the stage 2 AP map is set for 25 peak.
Car seems fine. Don't know if it's a problem.
it's ok, mine hit 28 one time, tuned at 26,spike once in a while is fine according to calvin. unless your always hitting 27 all the time. sometimes looking at these numbers makes you so paranoid about it. plus some evo are tune to 30plus.
ak47m203 is offline   Reply With Quote Quick reply to this message
Old 05-22-2010, 06:54 PM   #7
TURNITUP
Just Spooling Up
 
Join Date: Nov 2009
iTrader: (0)
Posts: 108
I hit 29 sometimes and maybe 30....this error always comes on soon as I hit high boost...I never really sat down with my tuner to get rid of this but we will on the next tune.
__________________
Mods
Brian Crower stage 2 cams
Forge wga
Megan racing TBE
Harmon motive UICP
K&N Cone filter
AEM tru boost/AEM wideband

E-Spec Tuned : 365hp 425tq @ 30psi holding 18psi
http://i9.photobucket.com/albums/a52...espec2copy.jpg
TURNITUP is offline   Reply With Quote Quick reply to this message
Old 05-22-2010, 07:00 PM   #8
newcomer81
Forum Lackey
 
newcomer81's Avatar
 
Join Date: Apr 2009
iTrader: (100)
Location: Norfolk, VA
Posts: 1,516
Quote:
Originally Posted by TURNITUP View Post
I hit 29 sometimes and maybe 30....this error always comes on soon as I hit high boost...I never really sat down with my tuner to get rid of this but we will on the next tune.
you can't. welcome to wonderful world of 30psi
__________________

BakaUnchi tune in progress

newcomer81 is offline   Reply With Quote Quick reply to this message
Old 05-22-2010, 07:16 PM   #9
cornercarver
X-phile
 
cornercarver's Avatar
 
Join Date: Aug 2009
iTrader: (100)
Posts: 965
Quote:
Originally Posted by Detsoob View Post
in a GSR.

How much overboost is bad?
What are the side effects of overboost?
Long term effects?
How does it effect drivability.
Etc.

I have always been a little unclear on this subject, can someone clear it up?
Overboost as a condition is where your engine is running more boost than what it is tuned for or outside its controlled conditions. Overboost as a feature is generally offered in sport cars which are turbocharged which they tune the car to run extra boost in certain conditions to make more power.
As a condition, it is caused either by malfunctioning parts or an improper tune etc.

Yes, overboost is bad. Side effects are an overall lean condition, knock and ultimately a blown motor.

I would only worry about your car if you are getting excessive knock or you're running lean when you are spiking at 27psi.
cornercarver is offline   Reply With Quote Quick reply to this message
Old 05-23-2010, 12:54 AM   #10
TURNITUP
Just Spooling Up
 
Join Date: Nov 2009
iTrader: (0)
Posts: 108
we hit 32psi on the dyno and had no knock.....we backed it down cuz thats scary hahah My injectors are maxed out 101% duty cycle now I'm on 92%. Need injectors and a red
__________________
Mods
Brian Crower stage 2 cams
Forge wga
Megan racing TBE
Harmon motive UICP
K&N Cone filter
AEM tru boost/AEM wideband

E-Spec Tuned : 365hp 425tq @ 30psi holding 18psi
http://i9.photobucket.com/albums/a52...espec2copy.jpg
TURNITUP is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the EvoXForums.com - Mitsubishi Lancer Evolution X Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Overboost Rogue Evo X Turbo 48 04-20-2010 10:49 PM
Overboost AP Stg 2 JDCZEvo Evo X Tuning 7 02-09-2010 04:33 PM
Overboost??? felixfeng Evo X Performance 4 02-04-2010 03:17 PM
overboost, what? JDCZEvo Evo X Engine (4B11T) 12 07-09-2009 01:23 AM
ASC problem with overboost ainawy101 Evo X Performance 25 05-24-2009 09:52 PM


All times are GMT. The time now is 03:29 AM.



Powered by vBulletin® Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Shoutbox provided by vBShout v6.2.1 (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.