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Pro tune question 2018 STI
Pro tune question 2018 STI
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Old 08-29-19, 11:45 PM   #1
Roddyzride
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Default Pro tune question 2018 STI

Hey guys, I’ve had my STI for about 8 months and I’d like to increase the power. I visited a well known tuner to discuss options and pricing.

I’d like to get some feedback and opinion.

Basically what was recommended was a protune only. No intake, no catback (note I do not want a loud exhaust at all)

He showed me a few dyno sheets and it looks like most 2015+ STI’s make about 240whp and 220wtq stock on his dyno and his 91 octane tune should get me to about 260-270whp and 290-300tq.

Is this what most people are seeing with a protune?
Is an intake worth any gains? He said it’s just a noise maker at the end of the day.

We discussed stage 2 and he said I’d need injectors, fuel pump, catted dp, intake etc and much much bigger budget.

I just want to be sure the protune only is a good gain. I don’t want to be redoing things at additional cost.

I’m not a 1/4 mile racer but he said one Customer ran a 12.7-12.8 after his tune which was 1 full second faster than stock.
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Old 08-30-19, 06:15 AM   #2
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Default Re: Pro tune question 2018 STI

A protune is honestly one of the best mods for our cars. Its a custom made map to that car. I would go with what your tuner is recommending. If you're going to get the car tuned then you will need an accessport. Might as well go for stage 1 with an intake and get the car tuned. Trust me, having the car protuned will make a night and day differance in the way you feel about the car.
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Old 08-30-19, 06:24 AM   #3
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Default Re: Pro tune question 2018 STI

I personally think every STi should be tuned away from the factory tune. Based on your post, I would recommend no parts changes and tune only.

If you do decide to go to Stage 2... Downpipe and tune is all you really need. You can get a fuel pump, but the injectors are just fine. If you're hitting 100%, do the math with the below picture and you'll have a better idea of where the injector is really at (more like 80%).

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Old 08-30-19, 06:30 AM   #4
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Default Re: Pro tune question 2018 STI

If you are going for a tune I'd at least get a down pipe. They are cheap and you'll gain a lot more. Stock injectors may be the limiting factor but they will be fine for a basic tune.
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Old 08-30-19, 07:04 AM   #5
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Default Re: Pro tune question 2018 STI

Be advised, what you are considering is a slippery slop. You must acknowledge that any sort of a tune can and will void your factory warranty. If you don’t agree with the concept of “Pay to Play” and do not wish to be accountable like an adult for your own decision, then stop thinking about it and stay stock.

There are plenty of success stories on the net about aftermarket tunes but are also littered with a few tragic endings. I am being “ that guy” because most of us are sick of seeing treads about “Subaru void my warranty......” or “I went to Tuner X and ........etc”. I am in no way against mods, just against immature decision making.
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Old 08-30-19, 11:21 AM   #6
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Default Re: Pro tune question 2018 STI

Cobb turbo back and pro tune Mustang Dyno with no fuel mods here. Couldn’t be happier with the car. Makes good power and I got 27.5 mpg on a recent 350 mile trip running 75 mph.
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Old 08-30-19, 11:29 AM   #7
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Default Re: Pro tune question 2018 STI

I'm guessing you did not hand calculate that MPG?
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Old 08-31-19, 03:09 AM   #8
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Default Re: Pro tune question 2018 STI

My 2018's details:-
Stock Car: 2018 STi AU Spec 220WHP
Stage 2: Processwest Intake, RCM EL headers, Invidia catted down pipe, 3 port and pro tuned 273WHP, quieter than stock lol
Current: Arashi TD06SL 20G BB, ID1000's, Turbosmart FPR, DW65C - 321WHP @ 20PSI
All power runs on same dyno.

Intake doesn't do much on stock turbo, just get a panel filter

Last edited by bobster22; 08-31-19 at 03:13 AM.
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Old 08-31-19, 03:20 AM   #9
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Default Re: Pro tune question 2018 STI

We often sell headers to guys that want NO sound increase and a bump in performance. Along with a pro-tune the feedback is generally a decent uptick in power, with slightly less exhaust sound, with no adverse effects.

The reasons are far and wide: emissions, stealth, prolonged reliability, mods without wife knowing, etc...

This setup vs stock is not even a close race. It's a decent bump in power.
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Old 09-04-19, 02:58 PM   #10
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Default Re: Pro tune question 2018 STI

I recently went back to stock (was running stage 2 pro tune) and I a NOW running MAP Stage 1.

It is REALLY impressive for a Stage 1 Map!

MAP Dyno'd 300 tq on 93, and it definitely feels it.
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