BrenTuning | 2015 STi - Blouch 1.5XTR, KillerB header, ID1000, stock block, catted DP

[Subi114]

Awesome build, I'm coming close to my install/tune day. And I've been tossing the idea around of just dropping a turbo In while I'm at it. I'm just worried about the longevity of the motor. If this is something the 15 STI Can handle IM wondering if going the 2.5xtr will be okay as well?

I'm in ca so I have awesome 91 (sigh) but I'm going to be doing the Cobb flex fuel kit as well. Basically with same set up as the op car but with a tomei elh tomei inlet and tomei dp 3" all the way to the catback.

So should I do it? @brentuning

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[SpiderSTI15]

Same question: If I am at stage 1 right now on my '15 STI and with a custom tune putting down 301 whp at 18psi using 91 grade fuel, what would it realistically cost me (parts and labor) to put down 400+ whp? And how reliable would my engine be for the next 8 years as a daily driver?

[carlos.danger]

Originally Posted by SpiderSTI15

Same question: If I am at stage 1 right now on my '15 STI and with a custom tune putting down 301 whp at 18psi using 91 grade fuel, what would it realistically cost me (parts and labor) to put down 400+ whp? And how reliable would my engine be for the next 8 years as a daily driver?

That's depends on many factors: maintenance, use, aggressiveness of tune, etc.

It's a difficult question to answer.

I've modified before and I can tell you it's better to over build and scale back during the tune, than to tune to the limits of your build. That's why I like this setup, can out put decent power without being at the limit of the parts.

If you can't afford to replace a motor with 400+ hp, you can't afford 400+ hp. It's why my garage is full of parts and my engine is still stock.

[SpiderSTI15]

Originally Posted by carlos.danger

That's depends on many factors: maintenance, use, aggressiveness of tune, etc.

It's a difficult question to answer.

I've modified before and I can tell you it's better to over build and scale back during the tune, than to tune to the limits of your build. That's why I like this setup, can out put decent power without being at the limit of the parts.

If you can't afford to replace a motor with 400+ hp, you can't afford 400+ hp. It's why my garage is full of parts and my engine is still stock.

Thanks for engaging my question. Great points and I agree, that's why I am a fan of LS3 conversions. Are there engines out there that people can swap into the STI that are popular because of the ease of the swap? Or, like this thread, what did this build cost in total? I'm trying to gauge the monetary impact. Can I do it for $15k or is it going to take $30k+? I read about this VW Jetta TSI 2.0 liter engine that is on stage 3 at 425 whp and talked to a local guy at a shop who said it only cost $13k total. That is definitely something I'm interested in, but I want to do it to my STI, not a Jetta...

[carlos.danger]

Is this your first subaru?
If you were to build exactly the car in the op of this thread you are looking at about $5k including installation and tune.

And no, there are no easy big engine swaps into these cars.

[SpiderSTI15]

Originally Posted by carlos.danger

Is this your first subaru?
If you were to build exactly the car in the op of this thread you are looking at about $5k including installation and tune.

And no, there are no easy big engine swaps into these cars.

Yes, my first. $5k... That's doable. What's the reliability like?

[carlos.danger]

Originally Posted by SpiderSTI15

Yes, my first. $5k... That's doable. What's the reliability like?

Again, it's all dependent on many factors.

This is an impossible question to answer.

Once you start modifying you lose reliability. It's as easy as that.

Reread the very first post in this thread. According to brentuning, they openly consider this setup and their tune a relatively.safe and comfortable setup for dd while adding power.

These aren't camrys. And they aren't corvettes. They are sensitive to mods and you need to take this into consideration when you start down that hill.

[SpiderSTI15]

Right on, thanks for the information, I appreciate the feedback. Reliability vs. Performance, the tradeoff. Sort of like power vs. endurance in athletic training. Yin and Yang.

[K3rm1tth3fr0g]

Originally Posted by Dave D.

Gotta love these Blouch turbos. I have the 20g-xtr 10cm and it is remarkably similar to the 1.5xtr. Running about the same psi and mods, save that I have mild exhaust cams and a forged motor. Hoping to take advantage of this and go SD and 22psi in a couple of weeks.

I guess I'll have to say I'm prejudiced and think Blouch is the way to go if you can possibly manage it. Very consistent results for so many builds.

Bumping ancient thread to ask dave if this sheet was pump gas or ethanol.

20 psi heavily indicates pump gas but 415/390 on a Dynocom on a 20G is very nice.

[Dave D.]

Originally Posted by K3rm1tth3fr0g

Bumping ancient thread to ask dave if this sheet was pump gas or ethanol.

20 psi heavily indicates pump gas but 415/390 on a Dynocom on a 20G is very nice.

This was on pump 92 + Lucas, about 95 octane. I remember a stock STI was good for about 240whp on this dyno.

Edit: This same setup made about 340whp on the Mainline Dyno.

[K3rm1tth3fr0g]

Originally Posted by Dave D.

This was on pump 92 + Lucas, about 95 octane. I remember a stock STI was good for about 240whp on this dyno.

Edit: This same setup made about 340whp on the Mainline Dyno.

That makes sense, thank you for clarifying.

John and I are currently deciding if we are going to use the VP X85 for my flex fuel tune, or if a separate map should be created for the VP fuel which is technically "race gas". Otherwise we would use pump E for my flex tune, and I imagine E70 vs E85 won't make too much difference on my lil 205. E70 allows most setups to hit MBT anyway...