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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 04-24-2012, 07:26 PM   #15
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Won't be much gains from an intake. The stock tube isn't very convoluted, and the airbox takes in air from the front of the car above the radiator, so it'll be clean, cool air while the car is moving.

I still think there are gains to be had by moving the first cat further down stream. And the second cat isn't worth keeping anyways since it isn't monitored.
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Old 04-24-2012, 09:35 PM   #16
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I think I'd keep the precat since startup is when your car is coughing out the largest quantity of carcinogenic aromatic compounds, and it happens right in your driveway where it will linger...that's just me. Maybe if you want to get fancy you could do a bypass valve.
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Old 04-24-2012, 10:06 PM   #17
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I'd say about 20hp MAX, especially with a tune. I'd like to see a rev limit raised to about 8k as well.

Not to mention a single exhaust plus a lighter header and simpler intake might save about 50+lbs.

I can't wait to see what the actual gains will be.
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Old 04-24-2012, 10:12 PM   #18
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I'd say about 20hp MAX, especially with a tune. I'd like to see a rev limit raised to about 8k as well.

Not to mention a single exhaust plus a lighter header and simpler intake might save about 50+lbs.

I can't wait to see what the actual gains will be.
Not gonna happen with simple I/H/E. maybe cams & remap ECU. Mine only raise extra 250RPM in EJ25 (NA)
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Old 04-24-2012, 10:22 PM   #19
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Unfortunately in California the only legal bolt-ons are a CARB legal intake (if available) and a catback below ~95 dB (forgot the exact amount). Headers, high flow cats, and testpipes are illegal, as well as non CARB legal intakes and loud exhausts
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Old 04-24-2012, 10:35 PM   #20
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Not gonna happen with simple I/H/E. maybe cams & remap ECU. Mine only raise extra 250RPM in EJ25 (NA)
I'm thinking the FA20 is more like a high revving Honda engine than the EJ. With a reflash or hondata ECU you can raise the revs quite a bit on the K20 family anywhere from 300-600RPMs+.

Sure, any higher and you might want to get better valve retainers, and cams, though they usually aren't worth the cost and rougher drivability for what you'd get.
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Old 04-24-2012, 10:38 PM   #21
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I'm thinking the FA20 is more like a high revving Honda engine than the EJ. With a reflash or hondata ECU you can raise the revs quite a bit on the K20 family anywhere from 300-600RPMs+.

Sure, any higher and you might want to get better valve retainers, and cams, though they usually aren't worth the cost and rougher drivability for what you'd get.
Them instead of K20, I would recommend comparing em w F20/F22 engine, cuz S2k owners (specially AP2) is having hard time squeezing extra RPM out of em
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Old 04-24-2012, 11:12 PM   #22
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Them instead of K20, I would recommend comparing em w F20/F22 engine, cuz S2k owners (specially AP2) is having hard time squeezing extra RPM out of em
From what I've read, some AP2 owners have a limit of 8600 which is about 400RPM more. And that might be enough to make a bit more power in the FA.

But yeah mods wise, it's looking like the FA is more like the F20/22, in that it will be harder to get more HP out of them.

But...we won't really know until we get our hands on them.
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Old 04-25-2012, 12:01 AM   #23
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they make about 172 whp stock so i/h/e may get you too 200 if lucky, but has anyone actually considered how are we suppose to tune this twin injector setup? its no walk in the park with direct injection... is cobb going to make a plug in for it?
cams and a intake manifold should do a lil justice.. hoping for 245whp n/a
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Old 04-25-2012, 12:58 AM   #24
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But the FA20 is less rev friendly than the EJ which has a very short stroke :O
I have this bad feeling increasing revs is going to be a bit of a problem.
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Old 04-25-2012, 01:06 AM   #25
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But the FA20 is less rev friendly than the EJ which has a very short stroke :O
I have this bad feeling increasing revs is going to be a bit of a problem.
But it's going to have vastly superior combustion at high revs. Lots of engines with 86mm strokes will rev to mid 8k without bottom end issues. Valvetrain seems to be the weak link/fuse for rpm.
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Old 04-25-2012, 02:33 AM   #26
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Guess we just need to wait for HomemadeWRX or someone who can get their hands on the engine to tell us the detailed specs...the short rods bother me quite a bit, the Honda motors are also 86x86 but they have much longer rods, and have those nifty dual cam profiles, whereas the FA20 will lose more and more bottom end as you push the power up (mild hybrid system? ).

For outright power things aren't looking so good, but at least we have an updated efficient combustion chamber design.

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Old 04-25-2012, 03:10 AM   #27
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Guess we just need to wait for HomemadeWRX or someone who can get their hands on the engine to tell us the detailed specs...the short rods bother me quite a bit, the Honda motors are also 86x86 but they have much longer rods, and have those nifty dual cam profiles, whereas the FA20 will lose more and more bottom end as you push the power up (mild hybrid system? ).

For outright power things aren't looking so good, but at least we have an updated efficient combustion chamber design.
Just keep in mind that 86x86 TRD BEAMS motor dyno plot I posted a while ago, which didn't have dual cam profiles either...
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Old 04-25-2012, 03:30 AM   #28
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Yea, but that supports my point because the TRD 3S-GE has basically no low end torque at all. By 4000rpm you're already down to 160Nm which is pathetic, and I bet that the FA20 at idle is better than that TRD engine at 2000rpm.

Not saying I'd care though The top end is like a freaking Ferrari 458 cut in half.
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