|
|
|
|
Thread Tools | Display Modes |
03-06-2013, 08:29 AM | #1 |
Scooby Newbie
Member#: 258300
Join Date: Sep 2010
Chapter/Region:
NESIC
Location: annville pa
Vehicle:02 wrx silver |
05 wrx pulsating help
I have an 05 wrx and when you are on it it starts pulsating and jumps between 15-20 psi boost. I don't know much about the car but it has an intake, bigger top mount intercooler, hks bov, and 3in turbo back exhaust with no cat. If someone could give me an idea what might be wrong that would be great. I was thinking it might need injectors??
* Registered users of the site do not see these ads.
|
03-06-2013, 09:41 AM | #2 |
Scooby Newbie
Member#: 309967
Join Date: Feb 2012
Chapter/Region:
BAIC
Location: Santa Cruz, CA
Vehicle:2003 WRX PSM vf34 |
I got a crap tune once that made the car have a back and forth feeling in the higher gears and the boost would fluctuate just as you are describing. It wasnt a violent feeling, but trying to accelerate on the freeway sucked. I would do some data logs and report back.
|
03-06-2013, 10:23 AM | #3 |
Scooby Specialist
Member#: 293894
Join Date: Sep 2011
Chapter/Region:
NWIC
Location: Billings,Mt
Vehicle:2011 wrx sti world rally blue |
my suggestion is to check for leaks,also bovs if leaky can cause this issue a crap intake could also cause issues if its not tuned for.
what intake is on it? do you know if its tuned? Last edited by Dakota D; 03-06-2013 at 10:33 AM. Reason: spelling |
03-06-2013, 10:39 AM | #4 |
Scooby Newbie
Member#: 258300
Join Date: Sep 2010
Chapter/Region:
NESIC
Location: annville pa
Vehicle:02 wrx silver |
|
03-06-2013, 11:01 AM | #5 |
Scooby Specialist
Member#: 293894
Join Date: Sep 2011
Chapter/Region:
NWIC
Location: Billings,Mt
Vehicle:2011 wrx sti world rally blue |
cheap as in ebay cheap? that could be the problem right there(maf readings could be severly skewed) and if its not tuned thats a double wammy,that can cause alot of other issues.
when it pulsates does the car feel like its jerking? |
03-06-2013, 11:40 AM | #6 |
Scooby Newbie
Member#: 258300
Join Date: Sep 2010
Chapter/Region:
NESIC
Location: annville pa
Vehicle:02 wrx silver |
Ok, it's not jerking its like a smooth pulsating.
|
03-06-2013, 11:44 AM | #7 |
Scooby Specialist
Member#: 293894
Join Date: Sep 2011
Chapter/Region:
NWIC
Location: Billings,Mt
Vehicle:2011 wrx sti world rally blue |
hmm.have you checked for leaks yet like i suggested earlier?
|
03-06-2013, 11:48 AM | #8 |
Scooby Newbie
Member#: 258300
Join Date: Sep 2010
Chapter/Region:
NESIC
Location: annville pa
Vehicle:02 wrx silver |
|
03-07-2013, 01:59 PM | #9 |
Scooby Newbie
Member#: 324962
Join Date: Jul 2012
Chapter/Region:
BAIC
Location: Morgan Hill CA.
Vehicle:02 WRX |
I just read about this, its apparently common w/stock bcs. The remidy would be 3 port ebcs + tune.
|
03-07-2013, 02:35 PM | #10 |
Scooby Newbie
Member#: 258300
Join Date: Sep 2010
Chapter/Region:
NESIC
Location: annville pa
Vehicle:02 wrx silver |
Would the turbo going bad cause this?
|
03-07-2013, 02:45 PM | #11 |
Scooby Newbie
Member#: 332781
Join Date: Sep 2012
Chapter/Region:
NESIC
Location: Worcester county
Vehicle:2006 STI OBP |
Check the vacuum line that goes from the turbo to the T-fitting before the stock BCS. There should be a small "restrictor pill" in the line somewhere that controls the amount of flow from the turbo to the sensor so it can accurately read boost levels. Make sure the machines hole in the pill doesn't have something blocking the consistent flow.
http://www.clubwrx.net/forums/tuning...-data-log.html Go to post 10 there's a diagram. |
03-08-2013, 04:53 PM | #12 | ||
Scooby Newbie
Member#: 171697
Join Date: Feb 2008
Chapter/Region:
MWSOC
Location: Orland Park, IL
Vehicle:04 WRX FP Green |
Quote:
It's good to check for holes/slits in the bcs vacuum lines, if there is one that means that air is bleeding, without ECU's knowledge, without bcs/ebcs ever getting chance to bleed/intercept that air, this results in less pressure being applied against wastegate, resulting in higher boost, you overshoot the target boost, turbo dynamics kicks in, you undershoot, and you keep oscillating back and forth. Quote:
No. |
||
03-09-2013, 12:58 AM | #13 |
Scooby Specialist
Member#: 170906
Join Date: Feb 2008
Chapter/Region:
RMIC
Vehicle:2002 WRX psm |
If the boost is oscillating you are overshooting your boost target. Best fix is to look up how to adjust your wastegate arm.
|
Thread Tools | |
Display Modes | |
|
|