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Old 08-01-2017, 11:54 PM   #1
ProjectN64
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Default 2005 STI stock tune reliability

Hi all, got a 2005 STI in september which is all stock (minus factory option K&N short ram) i'm wondering if there is way to tell if car is currently running on stock tune or if it's been protuned by previous owner? I have heard that the Stock sti tune isn't really good for the engine's health in longrun, is it safe to get an access port and run whichever "stage1" tune it comes with? I have done compression/leakdown tests with good results the car only has 60k miles. Any advice would be appreciated, i'm not looking for power just want my engine to stay healthy. Thanks all
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Old 08-02-2017, 08:47 AM   #2
fenix-silver
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Best bet would be to use a tactix cable to pull the current tune and compare it to a stock one.
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Old 08-02-2017, 11:34 AM   #3
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Take the intake off. Not a factory option either, SPT has their own intake, but you should NEVER install an intake on these cars without a retune.
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Old 08-02-2017, 02:21 PM   #4
ProjectN64
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Quote:
Originally Posted by car_freak85 View Post
Take the intake off. Not a factory option either, SPT has their own intake, but you should NEVER install an intake on these cars without a retune.
Are you serious? I thought for sure those K&N intakes were offered by the dealer? Would you say it's doing harm to the engine little by little? Should I source stock intake or get it tuned? I just hear alot of horror stories about people blowing engines after tuning
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Old 08-02-2017, 02:48 PM   #5
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Just commenting because I want to follow.

Feel like this is gonna get funny fast. -grabs popcorn-
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Old 08-02-2017, 03:02 PM   #6
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Use a Tactrix or find some one local with one that can pull the tune. Subaru does not offer options on intakes.
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Old 08-02-2017, 03:16 PM   #7
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Quote:
Originally Posted by 86Dreams View Post
Use a Tactrix or find some one local with one that can pull the tune. Subaru does not offer options on intakes.
Would you agree running an intake without tune is recipe for disaster? Do you think I should revert intake to stock or get an access port?
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Old 08-02-2017, 03:21 PM   #8
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Quote:
Originally Posted by car_freak85 View Post
Take the intake off. Not a factory option either, SPT has their own intake, but you should NEVER install an intake on these cars without a retune.


Listen to this guy. You can't get away with putting anything performance-wise on your engine without a tune.
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Old 08-02-2017, 03:33 PM   #9
ProjectN64
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Quote:
Originally Posted by fuelMuncher View Post
Listen to this guy. You can't get away with putting anything performance-wise on your engine without a tune.
Thanks, that I understand now. I bought the car with it on and don't have the stock intake which leaves me to ask about tuning it (before I decide to buy original intake). Can access port be trusted? I'd just be using a base tune to get the car running finely but worry it may end up blowing my engine.
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Old 08-02-2017, 04:43 PM   #10
car_freak85
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There are many modifications you can do without a tune. Cat back exhaust, intercooler, etc. (there are some exceptions, based on model year).

An intake is one of those mods that REQUIRE a retune. The problem arises mostly due to a change in the diameter of the intake pipe. The MAF is tuned for a specific diameter and changing that messes with the scaling of the sensor.

Also, intakes aren't really a helpful modification on most turbocharged cars anyway (cheap and easy gains are found on the exhaust side). The factory air box on our cars is thought to be efficient up to about 400 hp.

Do a search in your local subforum or on offerup/craigslist and I'll bet you can find a stock intake setup for free.
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Old 08-02-2017, 05:51 PM   #11
ProjectN64
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Quote:
Originally Posted by car_freak85 View Post
There are many modifications you can do without a tune. Cat back exhaust, intercooler, etc. (there are some exceptions, based on model year).

An intake is one of those mods that REQUIRE a retune. The problem arises mostly due to a change in the diameter of the intake pipe. The MAF is tuned for a specific diameter and changing that messes with the scaling of the sensor.

Also, intakes aren't really a helpful modification on most turbocharged cars anyway (cheap and easy gains are found on the exhaust side). The factory air box on our cars is thought to be efficient up to about 400 hp.

Do a search in your local subforum or on offerup/craigslist and I'll bet you can find a stock intake setup for free.
Thanks for the info!
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Old 08-02-2017, 11:45 PM   #12
ProjectN64
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Is there anyone that can speak on the Factory tunes 2005 STI's came with? I've heard by some people that some factory tunes caused engines to die prematurely, could be other years i'm not sure. If it's true then maybe it'd be better idea to get my car tuned instead of going through trouble of sourcing and swapping out the intake when it should be tuned right away
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Old 08-03-2017, 12:31 AM   #13
kmfdm86
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Just get it tuned. Not like you have a warranty to worry about. Get someone good and all should be fine. Hopefully. Lol.
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Old 08-03-2017, 12:43 AM   #14
ProjectN64
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Quote:
Originally Posted by kmfdm86 View Post
Just get it tuned. Not like you have a warranty to worry about. Get someone good and all should be fine. Hopefully. Lol.
funny you mention that, i do have an aftermarket warranty when i bought the car, power steering pump went out and was replaced no charge (800 dollar job at dealer), so hopefully someone can chime in on the factory tune. If i did decide on tune would you think access port is reliable?
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