Boost issue

Thomasc9
Learner Driver
Posts: 30
Joined: Sat Feb 25, 2017 5:16 pm

Boost issue

Postby Thomasc9 » Sat Feb 25, 2017 5:22 pm

Hey all,

First post -

I have a wrx sti 2003 stock and recently installed a catback 3 inch

ever since, the car feels like it is not boosting the same as when it had the stock exhuast installed

im looking for some advice on how to resolve the issue and potentially somewhere local that I can take it to be looked at

Living in melbourne Hampton area (close to the city)

thanks

sssxc
Learner Driver
Posts: 10
Joined: Tue Dec 04, 2012 5:26 am

Re: Boost issue

Postby sssxc » Sat Feb 25, 2017 5:27 pm

Get a tune...
Prob has over boosted and knocked which had pulled timing, added fuel and also pulled boost.

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Thomasc9
Learner Driver
Posts: 30
Joined: Sat Feb 25, 2017 5:16 pm

Re: Boost issue

Postby Thomasc9 » Sat Feb 25, 2017 5:45 pm

was told it wasnt necessary but thank you for your response will be getting a tune asap

have noticed fuel ecomy has been worse

mv75
WRX STi Driver
Posts: 857
Joined: Sat Dec 27, 2014 9:26 pm
Location: Brisbane Northside.

Re: Boost issue

Postby mv75 » Sat Feb 25, 2017 8:04 pm

Totally needs a tune, it's post 2000. It is over boosting guaranteed.

Thomasc9
Learner Driver
Posts: 30
Joined: Sat Feb 25, 2017 5:16 pm

Re: Boost issue

Postby Thomasc9 » Wed Mar 01, 2017 4:26 pm

Took it to a shop, its running at 7psi max.. was told its most likely a leak or the waste gate actuator is bad

ryano
Impreza WRX Driver
Posts: 271
Joined: Thu Aug 19, 2010 9:12 pm

Re: Boost issue

Postby ryano » Wed Mar 01, 2017 4:52 pm

id say it running waste gate pressure, check for error codes

Thomasc9
Learner Driver
Posts: 30
Joined: Sat Feb 25, 2017 5:16 pm

Re: Boost issue

Postby Thomasc9 » Wed Mar 01, 2017 5:12 pm

getting it up on the dyno tomoz with the tuner

ryano
Impreza WRX Driver
Posts: 271
Joined: Thu Aug 19, 2010 9:12 pm

Re: Boost issue

Postby ryano » Wed Mar 01, 2017 6:23 pm

good post

mv75
WRX STi Driver
Posts: 857
Joined: Sat Dec 27, 2014 9:26 pm
Location: Brisbane Northside.

Re: Boost issue

Postby mv75 » Wed Mar 01, 2017 6:37 pm

Better find any problems before you do that. A live view of it running will tell you straight away the problem (probably got the iam running below 8 so it's pulling boost due to it over boosting), as well as a few minutes of visual inspection as well as a grab of the waste gate actuator. Hopefully it's that simple, good luck tomorrow. :)

Thomasc9
Learner Driver
Posts: 30
Joined: Sat Feb 25, 2017 5:16 pm

Re: Boost issue

Postby Thomasc9 » Thu Mar 02, 2017 11:38 am

Well they were just going put it on the dyno to help diagnose.

sssxc
Learner Driver
Posts: 10
Joined: Tue Dec 04, 2012 5:26 am

Re: RE: Re: Boost issue

Postby sssxc » Thu Mar 02, 2017 7:19 pm

Thomasc9 wrote:was told it wasnt necessary but thank you for your response will be getting a tune asap

have noticed fuel ecomy has been worse

Whoever told you that is giving you wrong information...

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Andy05
Probationary Driver
Posts: 64
Joined: Fri Jan 09, 2015 7:00 pm

Re: Boost issue

Postby Andy05 » Thu Mar 02, 2017 8:04 pm

How'd you go? Find the issue?

Thomasc9
Learner Driver
Posts: 30
Joined: Sat Feb 25, 2017 5:16 pm

Re: Boost issue

Postby Thomasc9 » Thu Mar 02, 2017 8:43 pm

Took it to springy motors today and he suspects a clogged cat.

what do you guys suggest?

mv75
WRX STi Driver
Posts: 857
Joined: Sat Dec 27, 2014 9:26 pm
Location: Brisbane Northside.

Re: Boost issue

Postby mv75 » Thu Mar 02, 2017 8:50 pm

Thomasc9 wrote:Took it to springy motors today and he suspects a clogged cat.

what do you guys suggest?


Ah crap, I just totally realised, CAT BACK exhaust. Total waste of time. Yea, probably is clogged. Do it right and get turbo back then tune it. My bad as people usually get full exhaust and for some reason I filtered out the cat back bit.

Anyway, if it's possible to match your current cat back section, get a dump and new cat.

Thomasc9
Learner Driver
Posts: 30
Joined: Sat Feb 25, 2017 5:16 pm

Re: Boost issue

Postby Thomasc9 » Thu Mar 02, 2017 8:53 pm

the issue is matching it up.
bit of a mess atm

mv75
WRX STi Driver
Posts: 857
Joined: Sat Dec 27, 2014 9:26 pm
Location: Brisbane Northside.

Re: Boost issue

Postby mv75 » Thu Mar 02, 2017 9:05 pm

Any good exhaust shop should be able to cut and weld new flanges. Although look at the option for a full 3" system, a 2nd hand original system, or just replace the cat. It may be a cost thing right now, but I would leave off the tune if you don't get a full 3" system.

Thomasc9
Learner Driver
Posts: 30
Joined: Sat Feb 25, 2017 5:16 pm

Re: Boost issue

Postby Thomasc9 » Thu Mar 02, 2017 9:30 pm

im thinking of just going to an exhaust shop and getting them to custom make one from the cat to turbo back but chances are it wont fix the issue anyway.

taking it to a shop asap - still haven't had it assessed on a dyno

mv75
WRX STi Driver
Posts: 857
Joined: Sat Dec 27, 2014 9:26 pm
Location: Brisbane Northside.

Re: Boost issue

Postby mv75 » Fri Mar 03, 2017 1:57 am

Definitely find out If it is the cat first too. Do the temperature and rear o2 tests, unless they already did to come to the clogged cat conclusion instead of purely opinion.

Thomasc9
Learner Driver
Posts: 30
Joined: Sat Feb 25, 2017 5:16 pm

Re: Boost issue

Postby Thomasc9 » Fri Mar 03, 2017 1:04 pm

ok so it isnt the cat. any other suggestions?

Bad waste gate - not closing?

Bad turbo?

mv75
WRX STi Driver
Posts: 857
Joined: Sat Dec 27, 2014 9:26 pm
Location: Brisbane Northside.

Re: Boost issue

Postby mv75 » Fri Mar 03, 2017 1:35 pm

Waste gate you can check yourself.

Grab the actuator arm and see if it's loose, try and move it, it should be very hard by hand. Be careful of heat of course.

Put the original exhaust back on. Flow will be worse with the original dump and cat still there while suddenly opening up to 3". Plus diagnosing is much easier if it's back to "it used to work back when" condition.

Check all hoses and the turbo intake that they are on, secure and not ripped.

Bad turbo, possible but unlikely unless there is a nice grinding noise coming from it.

Take it to someone who knows Subarus.

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