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


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Old 02-19-2020, 02:10 PM   #43
Goingnowherefast
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The ITB hype definitely showed how much interest there is in another NA option past the level of "simple" bolt-ons, but I think the result really fell short since it didn't address any of the big issues facing this platform.

Said issues (IMHO):

1. Lack of oil lubrication at high sustained G loads and/or also at high engine speeds
2. The huge drop-off of power at high engine speeds
3. The relatively low rev-limiter for a motorsports oriented application
4. The LOL torque dip (this one's pretty obvious)

Picture:
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Old 02-19-2020, 02:24 PM   #44
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Quote:
Originally Posted by Goingnowherefast View Post
The ITB hype definitely showed how much interest there is in another NA option past the level of "simple" bolt-ons, but I think the result really fell short since it didn't address any of the big issues facing this platform.

Said issues (IMHO):

1. Lack of oil lubrication at high sustained G loads and/or also at high engine speeds
2. The huge drop-off of power at high engine speeds
3. The relatively low rev-limiter for a motorsports oriented application
4. The LOL torque dip (this one's pretty obvious)

Picture:

ITBs were supposed to address oiling and rev limit? Is this trolling, this feels like trolling.They didn't address the issue of lacking turbo either.
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Old 02-19-2020, 02:56 PM   #45
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ITBs were supposed to address oiling and rev limit? Is this trolling, this feels like trolling.They didn't address the issue of lacking turbo either.
That one more falls into the category of "general issues facing NA development of the FA20", while the rest are in directed towards the ITB shortcomings.
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Old 02-19-2020, 08:56 PM   #46
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Originally Posted by Goingnowherefast View Post
The ITB hype definitely showed how much interest there is in another NA option past the level of "simple" bolt-ons, but I think the result really fell short since it didn't address any of the big issues facing this platform.

Said issues (IMHO):

1. Lack of oil lubrication at high sustained G loads and/or also at high engine speeds
2. The huge drop-off of power at high engine speeds
3. The relatively low rev-limiter for a motorsports oriented application
4. The LOL torque dip (this one's pretty obvious)

Picture:
ITB's addressed the lack of eargasm the car so desperately cries for.

seems to me you just want to complain about other random personal issues with the motor.
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Old 02-20-2020, 12:43 PM   #47
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ITB's addressed the lack of eargasm the car so desperately cries for.

seems to me you just want to complain about other random personal issues with the motor.
This is a thread about NA development, hence why we're talking about NA development. I know people might be shocked to learn the FA20 isn't the 2nd coming of Christ, but it's still a decent engine with a lot of things to improve.
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Old 03-16-2020, 07:41 PM   #48
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I'm racing in NASA ST5 (14:1) and really need more midrange without the expense of top end. The BMWs I race against have a powerband I cannot compete with. I have nothing for them in the straights, yet I run lower lap times. The latter does not mattter in a race, so I'm all in on extracting more from the NA motor.
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Old 03-16-2020, 08:13 PM   #49
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Piper has had a few different camshaft profiles available for years now, unfortunately not much info out there on what results to expect.
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Old 03-17-2020, 06:26 PM   #50
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I'm racing in NASA ST5 (14:1) and really need more midrange without the expense of top end. The BMWs I race against have a powerband I cannot compete with. I have nothing for them in the straights, yet I run lower lap times. The latter does not mattter in a race, so I'm all in on extracting more from the NA motor.
Im not sure if its a true bolt in and drop in. but might you look at the 2.4 crank from the bigger FA motors, and then getting some hearty cam timing. something like a 270 duration should help over our puny stock cams.

that said you would have to check and recheck PTV clearances
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Old 03-17-2020, 07:36 PM   #51
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Im not sure if its a true bolt in and drop in. but might you look at the 2.4 crank from the bigger FA motors, and then getting some hearty cam timing. something like a 270 duration should help over our puny stock cams.

that said you would have to check and recheck PTV clearances
New fa24 still uses a 86mm stroke crank like the fa20, the bore is 94mm. A new short block assembly from subaru is around 2k. https://parts.subaru.com/p/Subaru_20...0103AC95A.html
The question is what needs to be done to the fa20 head combustion chamber to match the fa24 bore, and possibly higher compression pistons if staying NA.
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Old 03-17-2020, 07:40 PM   #52
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New fa24 still uses a 86mm stroke crank like the fa20, the bore is 94mm. A new short block assembly from subaru is around 2k. https://parts.subaru.com/p/Subaru_20...0103AC95A.html
The question is what needs to be done to the fa20 head combustion chamber to match the fa24 bore, and possibly higher compression pistons if staying NA.
its one of those scenerios if i had alot of extra money. id love to check it out and play with it

its akin to sasha's 4.2 VQ motor for his Z. its so excessive but the fruits are glorious.

and id not mess with the cylinder head first. from favtory they are prety decent id worry about fueling and getting everything to work together and see what sort of power it makes and then go back in and give it more intake and exhaust and see about cam timing. compression is already phat
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Old 03-17-2020, 09:53 PM   #53
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A good header will help auc on both sides of the peak. Aftermarket cams will introduce aftermarket problems imo.
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Old 03-18-2020, 11:31 AM   #54
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its one of those scenerios if i had alot of extra money. id love to check it out and play with it

its akin to sasha's 4.2 VQ motor for his Z. its so excessive but the fruits are glorious.

and id not mess with the cylinder head first. from favtory they are prety decent id worry about fueling and getting everything to work together and see what sort of power it makes and then go back in and give it more intake and exhaust and see about cam timing. compression is already phat

Pretty sure the head would have to be milled to match the new bore of the cylinder walls and pistons. That would lower the compression ratio and need custom pistons. Also, our exhaust ports suck but they can be lightly ported. To be fair this has already been done on by Toda 2.3L, and Monster sports 2.4L.
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