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

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Old 04-25-2012, 10:46 PM   #45
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Originally Posted by jkonquer View Post
Realistically, you don't gain much horsepower with a tune. But you gain lot of torque. Tuning makes the power band more linear. So the response on the low end will much quicker.
Personally intake or exhaust won't get much out of this car. 10 whp at tops. Again those are top-end power. You will probably loose some torque at the low end with just I/E. so tuning is a must if you are looking for "true" gain
This. The dyno chart shown earlier in the thread clearly indentified the pro's of a simple tune. Exhaust restriction from the factory, due to emission regulations, increases back pressure in the EGR system to cool down high compression chambers to reduce NOx. By opening up the exhaust and properly tuning the ECU you should notice an improvment in acceleration. Hopefully the magnitude of negitve slope on the torque band can be decreased so it will be as close to zero as possible. Btw when you tune the ride do not use a piggyback.
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Old 04-26-2012, 12:22 AM   #46
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Originally Posted by 86'd View Post
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.
Well, I hope our bottom ends are as unbreakable as theirs.
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Old 04-26-2012, 05:57 PM   #47
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Originally Posted by jkonquer View Post
Realistically, you don't gain much horsepower with a tune. But you gain lot of torque. Tuning makes the power band more linear. So the response on the low end will much quicker.
Personally intake or exhaust won't get much out of this car. 10 whp at tops. Again those are top-end power. You will probably loose some torque at the low end with just I/E. so tuning is a must if you are looking for "true" gain
Good post. This isn't like modding a Turbo car where you'll see significant gains like from a TBE, and/or a tune. You really have to be happy with the power this car makes because you're really not going to get much more out of mods from it, outside of doing a FI kit, spray, or if someone made an internals kit (higher comp pistons/cams). Biggest change will be the sound of the car, which is cool to do.

You're getting better delivery, smoother power out of a tune most likely, and maybe a couple top end horses at best. This is the inherent problem with high-comp, small displacement NA engines, and how they limit you.
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Old 04-27-2012, 01:08 AM   #48
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id like to think this motor is comparable to a sr20 have similar dimensions, bore, stroke and displacement. those can rev freely up too 9 or 10k with valvetrain
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Old 04-27-2012, 05:23 AM   #49
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The closest you can get to this engine is with the K20 and the Clio RS engine.
These can gain quite some hp with the right tune, with not much torque loss, so I'm going to be optimistic and say thate with the right full exhaust system and the best ECU we're going to see 15 hp of power increase.
With cams and intake even 30, so 220-230 flywheel hp and at least 10 nm of torque in the midrange, with peaks of 20, are feasible.
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Old 04-27-2012, 03:21 PM   #50
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I/H/E + Tune : No greater than 20whp/20wtq gain, but, realistically, more than +8/+8 The real key, I think, is going to be switching to a more efficient IM.
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Old 04-27-2012, 04:10 PM   #51
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With a relatively low redline and without variable valve lift, I don't think this engine will see major gains with just I/E/tune. But who knows, Subaru mentioned the engine easily hit its target output on its initial shake-down dyno run, so perhaps there is some untapped potential there.
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Old 04-27-2012, 04:31 PM   #52
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With a relatively low redline and without variable valve lift, I don't think this engine will see major gains with just I/E/tune. But who knows, Subaru mentioned the engine easily hit its target output on its initial shake-down dyno run, so perhaps there is some untapped potential there.
I think it's a question of how much low end torque you're willing to give up. As Dimman pointed out before, the 3S-GE can make better than Ferrari 458 specific torque with the TRD cams (and ITB/intake assembly, exhaust, and 13.1 compression), but if you're stuck without variable cam profiles then your low end torque basically doesn't exist :P

My proposed solution: a true performance oriented mild hybrid system to boost low end torque so it feels like a 2.4L everywhere
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Old 05-01-2012, 02:56 AM   #53
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I know when I saw the TRD version of the FRS at the Toyota museum. I ask the lady which is the head of TRD USA, what are the HP number on the intake is 9hp and the exhaust is 4hp. I do not know if each gain is the part alone or compounded each other though. But there are numbers to be gain if her statement is which is probably true.
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Old 05-01-2012, 08:20 AM   #54
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With a relatively low redline and without variable valve lift, I don't think this engine will see major gains with just I/E/tune.
i believe this motor has variable valve timing
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Old 05-01-2012, 08:27 AM   #55
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i believe this motor has variable valve timing
Timing yes. Lift no.
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Old 05-03-2012, 08:43 PM   #56
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I'm gonna leave it alone. OEM Bone Stock. The most I'd do is roll around 17 inch rims with some sticky tires in the summer, that's about it. And put snow tires on the stock rims for the winter since I do live in the mountains, god snow driving in this car is going to be interesting, if even feasable? (nothing like driving an impreza in a blizzard) :o
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Old 05-04-2012, 12:37 AM   #57
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No offense but I think Miatas doesnt have a good potential to increase the hp output so I wouldn't compare it with the FA20. I think the engine might have the potential likw the Honda K20A so 20-30whp may be possible.
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Old 05-04-2012, 01:34 AM   #58
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No offense but I think Miatas doesnt have a good potential to increase the hp output so I wouldn't compare it with the FA20. I think the engine might have the potential likw the Honda K20A so 20-30whp may be possible.
I'm still scared to try to crack this cars' ECU though.

KA20's you could do all kinds of shit too, may bee I just have to wait, as I'm not gonna be the guinea pig.
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Old 05-07-2012, 10:23 AM   #59
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If I/H/E/T might give roughly 20hp+ then what would be the additional gain numbers adding a TRD/HKS SC?
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Old 05-08-2012, 09:44 PM   #60
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im leaning toward a sc for the first time. seems less maintenance then turbo. hks made 394whp with the sc.
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Old 05-08-2012, 11:55 PM   #61
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im leaning toward a sc for the first time. seems less maintenance then turbo. hks made 394whp with the sc.
that wasnt just the sc kit though, they changed a few internal components and whatnot. Realistically you'll gain 50-70hp with a sc kit.
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Old 05-09-2012, 01:13 AM   #62
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What about a port n polish along with I/h/e/t and SC
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Old 05-09-2012, 12:08 PM   #63
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P&P isn't generally worth a whole lot. It's more of a 'I want to spend money on a bad bang/buck mod' for most cars. :P

edit: At least for mild builds, that is.
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Old 05-09-2012, 12:12 PM   #64
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Cams before port work.
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Old 05-09-2012, 12:12 PM   #65
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No offense but I think Miatas doesnt have a good potential to increase the hp output so I wouldn't compare it with the FA20. I think the engine might have the potential likw the Honda K20A so 20-30whp may be possible.
The older miatass have great motors for turbo, and the duratec/mzr is no slouch either...
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Old 05-09-2012, 11:34 PM   #66
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that wasnt just the sc kit though, they changed a few internal components and whatnot. Realistically you'll gain 50-70hp with a sc kit.
yea that's true. idk what to do about the compression though. its so high for stock and the car comes with equal length headers, that's 2 big power increases for Na applications.
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