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Old 11-30-2014, 05:43 PM   #1
scooby2005
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Join Date: Apr 2014
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2005 WRX STi
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Default How to continue w/ Stage 2 WRX STi

Current mods:
24mm rear and front sways
RCE yellow racing springs
Invidia catless DP
Stock intake
XPT OTS Stage 2 Map w/ Tactrix cable

What the problem is...
Ever since I mapped the XPT Stage 2, the turbo hasn't been kicking in very well compared to when I was stock with no mods and even stock with XPT Stage 1 map.
A friend of mine who has a lot of experience said I did it wrong and from this point should get an aftermarket CAI, aftermarket catback exhaust and then correctly map it with a COBB AP.
But from the research I did (I researched it a lot for a few weeks) I was under the impression that the stock intake could handle an entire TBE and only needed to be replaced with aftermarket if I was to get a new turbo or FMIC.

What have I done incorrectly and how can I correctly continue with my modifications?
I don't plan to get an aftermarket turbo or FMIC. For now all I want is to complete a full TBE with the correct tune and get my turbo running correctly again.
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Old 11-30-2014, 05:49 PM   #2
Minorthreat7171
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Have you checked for any leaks?
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Old 11-30-2014, 06:11 PM   #3
QsR
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04 Wrx Stage III
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What rpm do you achieve your 17-20lbs at in 3rd gear?
The map notes for the 2005 sti call for an aftermarket higher flowing drop in filter, such as the k&n or perrin. As minorthreat stated, definitely check for leaks.
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Old 11-30-2014, 06:13 PM   #4
2011WRXMT
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Your friend is an idiot. you do not need an intake the stock one is good up to 400hp I think. You may have a boost leak or something like that.
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Old 11-30-2014, 07:23 PM   #5
Aaronw9
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Get a Catback exhaust. It won't really have that much of an effect but it will allow for more airflow. Anything 3 inch will work.
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Old 11-30-2014, 10:35 PM   #6
Napalm3nema
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You have a catless downpipe, I'm guessing that's the issue as the map is more than likely for a catted downpipe. You should get protuned for the modifications you have then you'll be safe.
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Old 11-30-2014, 10:50 PM   #7
Mrsquirrel
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Protune +1
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Old 12-02-2014, 08:36 PM   #8
QsR
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Quote:
Originally Posted by Napalm3nema View Post
You have a catless downpipe, I'm guessing that's the issue as the map is more than likely for a catted downpipe. You should get protuned for the modifications you have then you'll be safe.
It's says right on the website that the map will work on catted or catless downpipes (kinda scary sounding because there's a huge difference between the two), but catless should work fine. And protune for what? Literally the only engine mod he has is a downpipe
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Old 12-02-2014, 09:40 PM   #9
Ziggyrama
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2012 Tribeca Ltd.

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Sounds like you have a crappy tune. There is a fair amount of people on this forum that had problems with XPT Roms.

- find a better tune: Cobb ots, TP, ROM raider, etc.

- wrap you turbo. That will help with spool and improve your IC efficiency.

- intake is optional. There is compelling evidence that stock intake does have a significant pressure drop when you get to around 280 g/s which is stock level power. Cobb intake have been shown to eliminate a lot of the pressure drop which means less pressure diff for the turbo to cope with....aka, better efficiency, aka, some extra power. Having tuned aem intake myself, I see some tangible gains in air flow in higher revs which is power for sure, in the order of 10-15 g/s.

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Old 12-02-2014, 09:51 PM   #10
AlucardFD
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Get a 3 inch catback, find someone to give you a dyno tune. /end
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Old 12-03-2014, 12:47 AM   #11
Napalm3nema
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Quote:
Originally Posted by QsR View Post
It's says right on the website that the map will work on catted or catless downpipes (kinda scary sounding because there's a huge difference between the two), but catless should work fine. And protune for what? Literally the only engine mod he has is a downpipe
I don't believe in not getting protuned if you have a catless downpipe. I'm a fanatic about tuning for the mods you have as sensitive as the Subaru engines especially are...
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Old 12-03-2014, 06:19 AM   #12
QsR
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Quote:
Originally Posted by Napalm3nema View Post
I don't believe in not getting protuned if you have a catless downpipe. I'm a fanatic about tuning for the mods you have as sensitive as the Subaru engines especially are...
Fair enough. But I would say to the OP then, before he gets a protune, acquire most of the parts he wishes to mod the car with and then go to get a protune.
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Old 12-03-2014, 06:45 AM   #13
Ziggyrama
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2012 Tribeca Ltd.

Default

Quote:
Originally Posted by Napalm3nema View Post
I don't believe in not getting protuned if you have a catless downpipe. I'm a fanatic about tuning for the mods you have as sensitive as the Subaru engines especially are...
Catted and catless are well withing range of operating parameters that ECU can handle. A well setup ROM can handle both without need for readjustment and or loss of efficiency. I am speaking from experience. I am currently catted but my RoM has been running on catless setups without problems.

That is the thing about being fanatic.....you generally loose sight of good reason

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Old 12-03-2014, 07:13 AM   #14
Guac
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Check your map notes and be sure your vehicle's modifications fall within those guidelines. Then check for leaks. If you have a leak, you won't be hitting your target boost (should be listed in your map notes).

Quote:
Originally Posted by QsR View Post
Fair enough. But I would say to the OP then, before he gets a protune, acquire most of the parts he wishes to mod the car with and then go to get a protune.
I agree with this. If you're going to spend the money on a pro-tune, I say get your vehicle running correctly for now then purchase all the parts that you would ever want on the vehicle and go get it pro-tuned. No need buy a part then pro-tune repetitively. That would be very inefficient.

Good luck OP.
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Old 12-03-2014, 06:14 PM   #15
scooby2005
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Rally Blue

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Thank you everyone for your responses.

I think I'll get a catback exhaust as soon as my expenses allow it, then purchase a COBB AP and get it pro-tuned. And from what you guys are saying I won't have to worry about an intake, which I won't until I get it protuned and ask my tuner/mechanic if he thinks its necessary for the mods I have
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Old 12-03-2014, 06:22 PM   #16
Gallo2011
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About the only other thing I would suggest buying prior to having your engine tuned is some sort of boost control. An EBCS is very helpful in assuring boost does not exceed the level the tuner sets.
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Old 12-03-2014, 07:02 PM   #17
BlackDahliaInFlames
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On my 04 STI I used to have the XPT stage 2 map and I always felt like it didn't kick as hard as even stock. I ended up buying an AP and flashing their OTS stage 2 map and it felt much better. I don't have numbers to compare the 2 maps but the Cobb map felt much better to me.
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