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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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01-20-2022, 12:42 PM | #1 |
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Building a FA20
I've got a 2014 BRZ, 66k miles. I'm planning on getting a second motor to build during the summer. My goal is to build the motor to handle 400 hp. This will be the first motor I've ever built so I want to do it right.
I'm planning on going with forged internals (obviously) but I am unsure of which brand is best. I am going with a turbo for FI and need to learn everything I can about what goes into this build. The information I'm looking for is what compression ratio should I go with and what parts are going to give me the "reliability" to hit 400hp. Money is no object in this build but I'd prefer to keep it around the 10k mark. As for the transmission, I've found a forged gear set claiming to support 800whp but it's 7k so I am also needing to know any information on what people are running for transmission's in their builds. If y'all could throw out some links to other builds or even links to information that could help, that would be extremely helpful. |
01-20-2022, 12:54 PM | #2 |
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Why not just buy a built IAG short block?
The issue with the transmission isn't the gear set. The synchro's are a bit sensitive and there is a clip on the 4th gear idler can get kicked off. Jacks transmissions has fixes for this but they are expensive. A lot of guys putting down big power use a CD09. Mazworks has a kit, I am sure others do to run that transmission.
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The Following User Says Thank You to NoHaveMSG For This Useful Post: | TommyW (01-20-2022) |
01-20-2022, 01:53 PM | #3 |
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Definitely an IAG. Has better oiling capabilities also. I have the Stage 1 and it handles 550 hp. I'm NA so should have no further problems. Price went up a grand this year from when I bought mine but you can see here what they use
Last edited by TommyW; 01-20-2022 at 02:08 PM. |
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01-20-2022, 05:18 PM | #4 | |
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T56 or CD009. There are some kits out there.
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01-21-2022, 12:25 AM | #5 | |
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That being said, you'll want:
From there I'd say get a decently reliable NA build then go FI from there once you learn more about those. Probably the 10.5:1 if you want big power an are going FI. I'm sure most of this you already knew, but I know seeing a post like this would've been helpful for me before I got into replacing my short block. Last edited by demasrv; 01-21-2022 at 12:41 AM. |
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01-21-2022, 10:19 AM | #6 |
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How much of the work are you planning on doing yourself? From everything I've experienced, rebuilding an FA20 for power and reliability is not for novice mechanics.
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01-21-2022, 11:17 AM | #7 |
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How much you paid? I want oil capability, maybe FI in the future
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01-21-2022, 04:59 PM | #9 | |
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Maybe I've been misinformed. The guy I bought my Jack's transmission from had two of them and I know they both went back to be refreshed due to broken things. He ran the car competitively in ST4 with small pulley Harrop torque with the top chopped off for power to weight reasons.
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01-21-2022, 05:03 PM | #10 | |
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04-01-2022, 05:51 AM | #11 | |
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04-01-2022, 06:59 AM | #12 | |
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Most of the work myself apart from any machining. I have rebuilt 3 engine's from the ground up previously. I used the wrong wording and what I meant was I've never modded/upgraded an engine before. |
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The Following User Says Thank You to SeddyBRZ For This Useful Post: | blsfrs (04-01-2022) |
04-01-2022, 09:51 PM | #13 |
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As someone that is a novice mechanic that did most of the work myself it can be done. BUT whats in bold is key...my built engine is sitting garage right now. Ive pulled that thing wayy too many times to count. Anyways, make sure your ready for lots of waiting and down time.
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04-02-2022, 01:13 PM | #14 | |
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Are you still just working with the stock block? Where are you seeing weakness/problems? Asking as the guy who just replaced my small block. I'm just wrapping up my break-in period. |
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