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Old 03-13-2019, 12:37 PM   #1
TheWontonDon
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Default Anxiety about this small but possibly significant detail

So i recently bought a 2004 STI off of an old friend of mine, decided he wanted to get a 2019. Anyways, the dummy has been running a CAI without a tune for quite some time now. I already know thats not good, what are the possibilities of **** that could go wrong? Im picking up a stockbox this weekend just worried. ease my worries !
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Old 03-13-2019, 01:39 PM   #2
Charlie-III
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Depending on your further goals......maybe pick up an AcessPort (from COBB) and flash a map.
May make a stock car better, will likely help a modded car (know your parts, compare to mapnotes....).
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Old 03-13-2019, 02:08 PM   #3
TheWontonDon
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Originally Posted by Charlie-III View Post
Depending on your further goals......maybe pick up an AcessPort (from COBB) and flash a map.
May make a stock car better, will likely help a modded car (know your parts, compare to mapnotes....).
Yeah i do want to get an accessport in the future but at the moment im focusing on getting this car in tip top shape first, coil packs, AOS, New fuel pump etc and just tryna keep a reliable stock subie for now. Is there any danger to the car with the current intake? Should i refrain from driving until i get ahold of this stock air box or a handheld?
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Old 03-13-2019, 02:16 PM   #4
rtv900
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Quote:
Originally Posted by TheWontonDon View Post
Is there any danger to the car with the current intake?
ok, this question will yield answers from:
a) your motor is a 'ticking time bomb'
to
b) it's fine

And everything in between
I'd lean towards answer (b)

You said he's been running that for some time right?
On a 15 year old car?
So MY question is:
What is 'some time'???????

Do you mean like a decade or so?
Or like 2 months?
Because depending on what 'some time' means you can answer this question easily regarding whether it makes a lick of a difference to have a tune.

(I'm kind of guessing if he's had an STI for 15 years he didn't decide after 14.75 years to mod the intake, just a guess though)
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Old 03-13-2019, 02:22 PM   #5
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Nobody knows the answer to this. It depends on so many things from how the car was driven to how the stock tune responded to the intake. Many intakes don't really need a tune for the car to run but if he raced and beat the **** out of it, chances are there's more wear than if he was running a stock intake.

The most important question is - is the car running ok right now? Assuming it is, because you bought it, just do whatever makes you feel better to it.
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Old 03-13-2019, 02:53 PM   #6
TheWontonDon
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Quote:
Originally Posted by rtv900 View Post
ok, this question will yield answers from:
a) your motor is a 'ticking time bomb'
to
b) it's fine

And everything in between
I'd lean towards answer (b)

You said he's been running that for some time right?
On a 15 year old car?
So MY question is:
What is 'some time'???????

Do you mean like a decade or so?
Or like 2 months?
Because depending on what 'some time' means you can answer this question easily regarding whether it makes a lick of a difference to have a tune.

(I'm kind of guessing if he's had an STI for 15 years he didn't decide after 14.75 years to mod the intake, just a guess though)

I think he has had it since like 2013. Not sure when he put the intake on.
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Old 03-13-2019, 02:56 PM   #7
TheWontonDon
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Originally Posted by mishapopa View Post
Nobody knows the answer to this. It depends on so many things from how the car was driven to how the stock tune responded to the intake. Many intakes don't really need a tune for the car to run but if he raced and beat the **** out of it, chances are there's more wear than if he was running a stock intake.

The most important question is - is the car running ok right now? Assuming it is, because you bought it, just do whatever makes you feel better to it.
The car has been running good as of now. It was running like poopoo before but it turned out that was because of incredibly old spark plugs. I gave her an oil change with motul 5-40w and some new NGKs and shes been running pretty good. He's not much of a gear head so i think the thing running like **** scared him away, but that was good for me because i bought it for very cheap. It does have kinda a bouncing at idle it stays under 1k but kinda goes up and down just a little, doesnt stall thought, i feel like it has something to do with the intake maybe.

I will be getting a new fuel pump this thursday and replacing the ignition coils this weekend.
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Old 03-13-2019, 03:11 PM   #8
Z3RO
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maybe remove the intake and put a stock one back on?
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Old 03-13-2019, 03:17 PM   #9
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Just FYI: Subaru offered an intake for the car as an SPT part, there was no tune. I would not worry about the intake as long as the car has been maintained and not abused.
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Old 03-13-2019, 05:36 PM   #10
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If that is the only mod on the car, the ECU has enough capability to accommodate the deviations made from the CAI. That said, you're also closer to the limit of what the ECU can adjust for. So let's say some scenario or event occurs where the computer would need to adjust, and it's already making adjustments for the CAI. That situation might cause damage, whereas if you had the full range of adjustment you may have been fine. See what I mean? Would I tune for it... absolutely.
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Old 03-13-2019, 06:00 PM   #11
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Did you have a compression and leak-down test performed before buying?

What mileage?

What did you pay?
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Old 03-13-2019, 06:22 PM   #12
TheWontonDon
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Originally Posted by gathermewool View Post
Did you have a compression and leak-down test performed before buying?

What mileage?

What did you pay?
i paid 3000 dollars for the car. It has 128k on the odometer. i did a compression test and it checked out good. As far as im concerned i got a steal on this thing as long as the motor doesnt crap out on me. I needs new struts and i've put about 800 into parts to get it running tip top. Im pretty happy with it.
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Old 03-13-2019, 06:23 PM   #13
TheWontonDon
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Originally Posted by bdubblu View Post
If that is the only mod on the car, the ECU has enough capability to accommodate the deviations made from the CAI. That said, you're also closer to the limit of what the ECU can adjust for. So let's say some scenario or event occurs where the computer would need to adjust, and it's already making adjustments for the CAI. That situation might cause damage, whereas if you had the full range of adjustment you may have been fine. See what I mean? Would I tune for it... absolutely.
Got it. Everything on the car is stock minus that intake, I will be picking up a stock intake this sunday and plan to tune in the future but for now Im gonna worry about struts. The only other mod is a racing clutch he had put in
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Old 03-13-2019, 07:02 PM   #14
TheWontonDon
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Quote:
Originally Posted by bdubblu View Post
If that is the only mod on the car, the ECU has enough capability to accommodate the deviations made from the CAI. That said, you're also closer to the limit of what the ECU can adjust for. So let's say some scenario or event occurs where the computer would need to adjust, and it's already making adjustments for the CAI. That situation might cause damage, whereas if you had the full range of adjustment you may have been fine. See what I mean? Would I tune for it... absolutely.
Also quick question to anyone who sees this. I wanna replace the injectors just as preventative maintenance, I cant seem to find oem ones whats a good oem replacement or does anyone have the part number for oem? I found these on amazon are these ok: https://www.amazon.com/Denso-Injecto.../dp/B0735VHXVR

how about these: https://www.amazon.com/Injector-Suba...HQF1GBWT5QYKKK
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Old 03-13-2019, 07:04 PM   #15
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I had an AEM intake (no tune required) on my 19 WRX until Cobb released the Stage1+ (Cobb's intake requires a tune as the MAF is located in a different location in the intake tract). The AEM did perfectly fine without a tune and I'd do it again if the WRX's stock map wasn't such crap around 5K RPM with its flat spot.
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Old 03-13-2019, 07:07 PM   #16
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Quote:
Originally Posted by TheWontonDon View Post
i paid 3000 dollars for the car. It has 128k on the odometer. i did a compression test and it checked out good. As far as im concerned i got a steal on this thing as long as the motor doesnt crap out on me. I needs new struts and i've put about 800 into parts to get it running tip top. Im pretty happy with it.
Hell, even if the engine goes, ya did alright.


Any rust?
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Old 03-13-2019, 07:20 PM   #17
TheWontonDon
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Originally Posted by Hondaslayer View Post
Hell, even if the engine goes, ya did alright.


Any rust?
That's what im saying. I was factoring in a rebuild to the price and i was like well after all that I'd have a brand spankin STI for like 10k. No rust, fortunately I hail from the land of sunshine and high taxes (Cali lol). Body has a few scratches but no dents or anything and the wing was professionally deleted so it looks kinda clean. Might keep it wingless not sure though
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Old 03-14-2019, 09:45 AM   #18
Burn all four
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You should post a pic of the car? My cousin has a 2005 STI.
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Old 03-14-2019, 10:36 AM   #19
rtv900
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Quote:
Originally Posted by TheWontonDon View Post
I was factoring in a rebuild to the price and i was like well after all that I'd have a brand spankin STI for like 10k.
hmmmm, ok, if that would satisfy you more power to you, but 10k for a 15 year old chassis and a rebuilt motor is really not that sweet of a deal.
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Old 03-14-2019, 01:27 PM   #20
TheWontonDon
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Originally Posted by rtv900 View Post
hmmmm, ok, if that would satisfy you more power to you, but 10k for a 15 year old chassis and a rebuilt motor is really not that sweet of a deal.
thats if i had to do the rebuild. At the moment I have put 800 bucks into it meaning I have an Sti that runs for 3800. Seems like a deal to me. And Idk where u can find an sti for 10k but please let me know im game!!
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Old 03-14-2019, 01:50 PM   #21
TheWontonDon
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Quote:
Originally Posted by Burn all four View Post
You should post a pic of the car? My cousin has a 2005 STI.
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Old 03-14-2019, 01:54 PM   #22
TheWontonDon
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Quote:
Originally Posted by Burn all four View Post
You should post a pic of the car? My cousin has a 2005 STI.
sorry man i existed back in the myspace days and I still dont remember how to do that !! I tried photobucket thats what i used to use but that charges you money now??!! wtf
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Old 03-14-2019, 01:56 PM   #23
TheWontonDon
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Quote:
Originally Posted by Burn all four View Post
You should post a pic of the car? My cousin has a 2005 STI.
https://photos.google.com/photo/AF1Q...bhBKIRCkFk5AQF

https://photos.google.com/photo/AF1Q...OQ_QUhYBDQf55n
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Old 03-14-2019, 02:18 PM   #24
rtv900
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Quote:
Originally Posted by TheWontonDon View Post
thats if i had to do the rebuild. At the moment I have put 800 bucks into it meaning I have an Sti that runs for 3800. Seems like a deal to me. And Idk where u can find an sti for 10k but please let me know im game!!
huh?

you just bought a 15 year old STI for 3 grand but you don't believe that out of the 14 more recent production years there exists some for sale for 10 grand?
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Old 03-14-2019, 03:30 PM   #25
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