(GR86) Second Generation FR-S/BRZ insider info...

[ZDan]

The 2.4 has the same 86mm stroke as the FA20 2.0, right? Shouldn't need any additional magic to spin it to 7400rpm...

[Lantanafrs2]

Originally Posted by ichitaka05

I’ll be honest, tech on FA engine (FA20DIT, FA24 & so on). Toyota did give good amount of knowledge... but not enough. Sadly Subaru didn’t applying all of em. If they did, they would of kept 2 liter pushing 220 or even 230hp instead of 2.4 liter w 217 or whatever articles are claiming

If you're talking crank horsepower, our cars will make 230 with proper tuning.

[ichitaka05]

Originally Posted by Lantanafrs2

If you're talking crank horsepower, our cars will make 230 with proper tuning.

I'm talking about stock. Hell, if you wanna go tuning and so forth, Toyota hit 260hp w this engine before.

Again, not talking about aftermarket, cuz there's no rule in aftermarket world.

Edit: correction, it was 260ps... so 256hp-ish?

[Lantanafrs2]

Originally Posted by ichitaka05

I'm talking about stock. Hell, if you wanna go tuning and so forth, Toyota hit 260hp w this engine before.

Again, not talking about aftermarket, cuz there's no rule in aftermarket world.

Edit: correction, it was 260ps... so 256hp-ish?

That's what they claim. Take it with a grain of salt. That would be 225 to 230 at the wheel

[Tcoat]

Originally Posted by ZDan

The 2.4 has the same 86mm stroke as the FA20 2.0, right? Shouldn't need any additional magic to spin it to 7400rpm...

The magic will come into play by giving the people all the "it can do's" and still meet the mileage and emission control requirements. These standards are already much tighter than when the current engines were approved in 2011 and are getting more stringent every year.
All this "they just need to do this and that" is just pissing in the wind when they have to follow rules that the armchair engineers here don't know or care about.

[ichitaka05]

Originally Posted by Lantanafrs2

That's what they claim. Take it with a grain of salt. That would be 225 to 230 at the wheel

Yup! Take it as a grain of salt. Cuz I haven’t seen that dyno. They just told me & I just listened... But they kinda proven it w 86GRMN, pushing 220ps (216hp) & still street legal (in Japan).

[ZDan]

Originally Posted by Tcoat

The magic will come into play by giving the people all the "it can do's" and still meet the mileage and emission control requirements. These standards are already much tighter than when the current engines were approved in 2011 and are getting more stringent every year.

And yet n.a. performance engines from other manufacturers are still able to make more and more horsepower....

All this "they just need to do this and that" is just pissing in the wind when they have to follow rules that the armchair engineers here don't know or care about.

225-240hp from a 2.4 liter n.a. four is *well* within the realm of the possible and is IMO plausible.

We shall see...

[Lantanafrs2]

The fa20 is a performance leap for Subaru in terms of hp/liter naturally aspirated but not much of a leap relative to honda. It does what it was designed to do and not much else. Nor does it leave a lot on the table as far as durability goes. At least the 86 is a good looking platform

[Tcoat]

Originally Posted by ZDan

And yet n.a. performance engines from other manufacturers are still able to make more and more horsepower....

As in? There are valid reasons why the low compression FI engine is taking over even in the most mundane of ecobox cars.

[mrg666]

Originally Posted by ZDan

And yet n.a. performance engines from other manufacturers are still able to make more and more horsepower....

Asking since I could not find, do you know any other NA 2.0L engine that makes more than 200hp stock? Closest I could find is 2019+ Miata Skyactive 2.0L that makes 185hp.

[NoHaveMSG]

Originally Posted by Tcoat

As in? There are valid reasons why the low compression FI engine is taking over even in the most mundane of ecobox cars.

Probably referring to the Honda K Series. It's a lot of work, but guys are busting the 300hp mark NA. 4Piston Racing builds a 500hp NA K motor if you feel like taking a mortgage out on the house.

[Yoshoobaroo]

Originally Posted by mrg666

Asking since I could not find, do you know any other NA 2.0L engine that makes more than 200hp stock? Closest I could find is 2019+ Miata Skyactive 2.0L that makes 185hp.

Any other CURRENT NA motor. Big distinction there.

[Tcoat]

Originally Posted by NoHaveMSG

Probably referring to the Honda K Series. It's a lot of work, but guys are busting the 300hp mark NA. 4Piston Racing builds a 500hp NA K motor if you feel like taking a mortgage out on the house.

Repeat! What can be done by Joe's Speed Shop is not the same as what the manufacturers can do. The sky is the limit if you don't have to follow the rules.
I would like to know what modern four cylinder engines are out there that break the 100HP per litre N/A barrier while still meeting the 2020 environmental requirements. Even the current engine will not meet the requirements for new build in 2022. By 2025 it will be damn near impossible to have a high revving NA engine of any type.

[NoHaveMSG]

Originally Posted by Tcoat

Repeat! What can be done by Joe's Speed Shop is not the same as what the manufacturers can do. The sky is the limit if you don't have to follow the rules.
I would like to know what modern four cylinder engines are out there that break the 100HP per litre N/A barrier while still meeting the 2020 environmental requirements. Even the current engine will not meet the requirements for new build in 2022. By 2025 it will be damn near impossible to have a high revving NA engine of any type.

Yeah, that would be none. I was thinking not stock