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11-14-2012, 02:32 AM | #1 |
Scooby Newbie
Member#: 298637
Join Date: Oct 2011
Chapter/Region:
NESIC
Location: west haven CT
Vehicle:2002 WRX WHITE |
Help 2002 Wrx Not Holding Boost?!
Hey guys so I just got my first turbo car (2002 wrx) While doing some decent pulls I noticed on my Turbo gauge it spikes then drops and spikes and drops. What do you think this could be mods are:
Cobb v.1 accessport stage 2 93 oct map Kartboy s/s Forge recirc valve K&N panel filter Catless up pipe (ebay brand) Catless turbo back exhaust (ebay brand) Oil/air separator Cx racing alum. radiator Jna turbo timer Turbo blanket Silicone turbo inlet Front+rear strut tower braces H-brace sub support (i know most of them definitely have nothing to do with it just giving you the whole low down) PLEASE HELP A NOOB THANKS
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11-14-2012, 02:55 AM | #2 |
Scooby Newbie
Member#: 261764
Join Date: Oct 2010
Location: Kelowna BC
Vehicle:2003 Impreza WRX Blue |
Fluctuating boost is usually caused by a boost leak. Get the system pressure tested and fix your leaks then go from there.
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11-14-2012, 07:37 AM | #3 |
Scooby Specialist
Member#: 181298
Join Date: May 2008
Chapter/Region:
MAIC
Location: MAIC
Vehicle:2019 KUV 21 Crystal White |
Did it just start doing this with the temp change?
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11-14-2012, 12:45 PM | #4 |
Scooby Newbie
Member#: 298637
Join Date: Oct 2011
Chapter/Region:
NESIC
Location: west haven CT
Vehicle:2002 WRX WHITE |
how would you recommend getting it pressure tested?
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11-16-2012, 01:52 AM | #5 |
Scooby Newbie
Member#: 298637
Join Date: Oct 2011
Chapter/Region:
NESIC
Location: west haven CT
Vehicle:2002 WRX WHITE |
At WOT in 5th gear especially I can feel the car loose boost over and over again as well as the gauge. The car holds perfect boost around 10 psi but once it hits 14/15 it will drop and go back and drop and go back. (Definitely not just a gauge problem) :/
ANY RECOMMENDATIONS? |
11-29-2012, 01:05 AM | #6 |
Scooby Newbie
Member#: 298637
Join Date: Oct 2011
Chapter/Region:
NESIC
Location: west haven CT
Vehicle:2002 WRX WHITE |
it hits anywhere between 15/20! BUMP AND DROPS
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11-29-2012, 09:59 AM | #7 | |
Scooby Specialist
Member#: 321715
Join Date: May 2012
Chapter/Region:
Tri-State
Location: Philly/SJ
Vehicle:03 Big 16G WRX PSM |
Quote:
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11-29-2012, 11:26 AM | #8 | |
Scooby Specialist
Member#: 89628
Join Date: Jun 2005
Location: Hawaii, Oahu
Vehicle:'02 Wagon VF39'd & Quick Racked |
Quote:
Any tune will hold proper boost in all gears. |
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11-29-2012, 12:22 PM | #9 | |
Scooby Specialist
Member#: 170906
Join Date: Feb 2008
Chapter/Region:
RMIC
Vehicle:2002 WRX psm |
Quote:
And most cars are tuned for 3rd/4th whether it's a dyno tune or road tune. A car tuned for solid XXPSI in 3rd/4th will usually overshoot the boost target a bit in 5th on the stock boost control management. @OP: Oscillating boost is an indication that you're overshooting your boost target. Talk to the original owner and find out who tuned it, or if it's even tuned at all. Then talk to the tuner. If it's not tuned, then yeah really talk to a tuner, and stop going WOT. If the cars tuned, it may be because of the colder weather and you may just need to loosen the wastegate arm a little bit. Get more info on the car first though. Is it just the COBB ots map? Here's a good rule of thumb. WOT on the interstate? drop it down to 4th at least. Not enough gear in 4th to downshift and go WOT? You're already going too fast! 4th gear tops out north of 100mph... Hell 3rd gear can get you to something like 80 if i'm not mistaken. Plus, EGTs start to be come questionable on most tunes after a hard 4th gear pull anyway. Last edited by ogboot; 11-29-2012 at 02:30 PM. |
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11-29-2012, 05:56 PM | #10 | |
Scooby Specialist
Member#: 321715
Join Date: May 2012
Chapter/Region:
Tri-State
Location: Philly/SJ
Vehicle:03 Big 16G WRX PSM |
Quote:
and 3rd gear tops out in the high 90s... I've done a lot of 3rd gear pulls for tuning |
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11-30-2012, 01:17 PM | #11 |
Scooby Newbie
Member#: 298637
Join Date: Oct 2011
Chapter/Region:
NESIC
Location: west haven CT
Vehicle:2002 WRX WHITE |
thanks for the input! I am going to take it out tonight and go wot in 3rd and see if it over boosts.
It is tuned with a Cobb Accessport stage 2 93 oct (1st generation accessport) |
11-30-2012, 01:22 PM | #12 | ||
Scooby Specialist
Member#: 13530
Join Date: Dec 2001
Chapter/Region:
NWIC
Location: Cascadia
Vehicle:EA63 , EA81T, EJ20G, EJ205 |
Quote:
Quote:
OP: I am having this same problem right now, but I'm waiting to have my car tuned. I have essentially a Vishnu stage zero kit installed. Last edited by car_freak85; 11-30-2012 at 01:48 PM. |
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11-30-2012, 04:41 PM | #13 | |
Scooby Specialist
Member#: 170906
Join Date: Feb 2008
Chapter/Region:
RMIC
Vehicle:2002 WRX psm |
Quote:
This map might be right up your alley, from their site: " Low Wastegate - For vehicles exceeding target boost". Protune would be better. But really, continuing to go WOT isn't going to fix a thing. Quite the opposite. Your mod list does not include a wideband O2 sensor, so you don't have a clue what your AFR is doing. Don't bother looking at the AP because it's just reading off of the stock sensor and it's likely not going to be correct. |
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12-06-2012, 10:44 AM | #14 |
Scooby Newbie
Member#: 298637
Join Date: Oct 2011
Chapter/Region:
NESIC
Location: west haven CT
Vehicle:2002 WRX WHITE |
thanks man ill try that map!
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12-06-2012, 04:10 PM | #15 |
Scooby Newbie
Member#: 246813
Join Date: May 2010
Chapter/Region:
NWIC
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Do you have the factory boost solenoid installed still?
That's your reason why if so. |
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