messing with the boost on a all sock motor question
05-01-2005 | 11:30 PM
#1
Thread Starter
Registered User
iTrader: (9)
Joined: Dec 2004
Posts: 3,904
From: SF CA
Car Info: 05 wrx
messing with the boost on a all sock motor question
hey guys/and gals, just wondering... if i got a boost controler and brought the boost from the stock 13psi, up to 14.5psi(1 bar) would it be safe? or is that too much for the motor, and or, the turbo to handle? if i did this what kinda gains (HP) would i see? thanx!
05-09-2005 | 09:33 PM
#6
I’m no expert on the subject but here’s how I understand it.
cl=closed loop
ol=open loop
In closed loop the ECU monitors the O2 sensor and all of the other sensors in the system and adjusts fuel accordingly (cruising, good for economy and emissions, target a/f ratio is around 14.7:1).
In open loop the ECU does not monitor the O2 sensor to adjust fuel delivery (60%ish to WOT, a/f ratio more rich depending on signals from various sensors like egt that will warn the ecu of dangerous conditions, target a/f ratio is around 13:1+ depending on egt’s etc.).
On 04+ WRX’s the there is a larger gap in the transition between cl and ol and this can make for lean conditions so a MBC can = boom. AFAIK, it’s not as much of a problem for the 02’s and 03’s but that doesn’t mean you can hook it up to your 02 and run major boost. I went the EM route so I don’t know anything other than what I’ve read about MBC’s and EBC’s but I would think you would be better off saving up some more $ for EM. Depending on what form of em you get you could run both.
If any of you experts out there see any misinformation please speak up.
cl=closed loop
ol=open loop
In closed loop the ECU monitors the O2 sensor and all of the other sensors in the system and adjusts fuel accordingly (cruising, good for economy and emissions, target a/f ratio is around 14.7:1).
In open loop the ECU does not monitor the O2 sensor to adjust fuel delivery (60%ish to WOT, a/f ratio more rich depending on signals from various sensors like egt that will warn the ecu of dangerous conditions, target a/f ratio is around 13:1+ depending on egt’s etc.).
On 04+ WRX’s the there is a larger gap in the transition between cl and ol and this can make for lean conditions so a MBC can = boom. AFAIK, it’s not as much of a problem for the 02’s and 03’s but that doesn’t mean you can hook it up to your 02 and run major boost. I went the EM route so I don’t know anything other than what I’ve read about MBC’s and EBC’s but I would think you would be better off saving up some more $ for EM. Depending on what form of em you get you could run both.
If any of you experts out there see any misinformation please speak up.
05-10-2005 | 04:21 PM
#8
From what I've read one of the difference's between a mbc and an ebc (depending on the brand) is that an ebc allows you to set boost based on throttle or rpm and will also allow you to boost your max setting in all gears. Like I said before I don’t have any personal experience with EBC's or MBC's but from what I've read I think you will have this problem with any boost controller on a 05 whether its an EBC or a MBC.
Hopefully someone with more knowledge on this subject can confirm or discredit this.
Hopefully someone with more knowledge on this subject can confirm or discredit this.
Thread
Thread Starter
Forum
Replies
Last Post