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Old 01-07-2023, 01:10 AM   #1
banzai-88
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All motor build? Stroke, ITBS, Ethanol?!?

Hey yíall, kinda new to this forum page but I have a question that I canít find much info on. Obviously everyone likes to talk about adding power to this platform but everyone always does FI. Has anyone actually done a like solid all motor build? Iím talking stroked out to 2.1 / 2.2 L, ITBs, Ethanol, cams, like the whole shibang? Could you make a noticeable amount of more power? Something like 250 maybe even 300? Kinda just tossing ideas out there, the feel of the NA is so much more enjoyable and predictable in my opinion and Iíd love to hear yíallís thoughts on the idea, cheers
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Old 01-07-2023, 03:01 AM   #2
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Look here to start: https://www.ft86club.com/forums/showthread.php?t=63901
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Old 01-07-2023, 03:01 AM   #3
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I was once demonized for calling such a thing stupid, but people didn't seem to want to admit that I suggested that if the engine was restricted to NA by some class rules or if you just wanted to be fruity and have fun all good. This would fall into the latter category. You would spend more money to get less power, but it would be cool in my book. Would probably sound pretty damned cool.

Toda 2.3 kit
https://www.toda-racing.co.jp/en/pro...odel/fa20.html

Sard ITBs
https://www.sard.co.jp/parts/product...ttlekit_zn6c6/

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Old 01-07-2023, 05:30 AM   #4
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I`m pretty sure you can get a 2.4
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Old 01-07-2023, 06:32 AM   #5
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The short reason is cost: A good S/C kit like (innovate, for example) is less than 10 grand with a few supporting mods, and gets an OEM-like powerband, as well as good reliability, provided you don't go too far above 220-230whp, which would be the upper limit of an NA build.

If you want to go N/A, a K-Swap might be cheaper, more powerful, better supported and more reliable.

I've only seen a few videos of cars with the ITB kit running properly. And FA's just don't rev all that well, oiling can become an issue. There's a post by a Peruvian shop about it (whose car also happens to have a twin screw SC):
https://www.ft86club.com/forums/showthread.php?t=134863
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Old 01-07-2023, 09:41 AM   #6
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Originally Posted by themadscientist View Post
I was once demonized for calling such a thing stupid, but people didn't seem to want to admit that I suggested that if the engine was restricted to NA by some class rules or if you just wanted to be fruity and have fun all good. This would fall into the latter category. You would spend more money to get less power, but it would be cool in my book. Would probably sound pretty damned cool.

Toda 2.3 kit
https://www.toda-racing.co.jp/en/pro...odel/fa20.html

Sard ITBs
https://www.sard.co.jp/parts/product...ttlekit_zn6c6/


I hadnít even seen that 2.3 kit before, Imma have to look into that, and I agree, definitely more expensive but Iím kinda just bored with FI builds, my two other cars are FI and I really donít wanna jump on the bandwagon of just FI. Iíve ridden in a few FI Brzs and theyíre really fun and nice but just not my cup of tea
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Old 01-07-2023, 09:43 AM   #7
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I`m pretty sure you can get a 2.4

2.4 from the new ones?
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Old 01-07-2023, 10:32 AM   #8
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It would be more cost effective to sell/trade in the 2015 and buy a Gen2 TBH. Same power as an all out NA FA20 with a warranty. $10k+ for a high strung FA20 and maybe 215whp... IDK man.
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Old 01-07-2023, 11:19 AM   #9
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Not worth it. Stroking the FA20 is not a good idea.
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Old 01-07-2023, 11:59 AM   #10
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Not worth it. Stroking the FA20 is not a good idea.
Can I ask why? I havenít seen many people do it and I guess thatís a sign but I still wonder
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Old 01-07-2023, 12:00 PM   #11
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It would be more cost effective to sell/trade in the 2015 and buy a Gen2 TBH. Same power as an all out NA FA20 with a warranty. $10k+ for a high strung FA20 and maybe 215whp... IDK man.
Yeah I understand that, the car is my significant others and she has a lot of sentimental value with it so if I could convince her, I would, but Iím not even going to bring it up lol
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Old 01-07-2023, 12:47 PM   #12
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Can I ask why? I havenít seen many people do it and I guess thatís a sign but I still wonder
It's in the thread @whataboutbob posted and the reason it had a custom stroker kit. The TLDR is that the rod to stroke ratio is already poor. Stroking it makes it worse. The farther out on the crank you move the rod, the more angle the rod goes through as it runs through it's motion. The higher angles are hard on everything.
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Old 01-07-2023, 12:52 PM   #13
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Has anyone done rough costs analysis on a FA24 swap yet?
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Old 01-07-2023, 04:50 PM   #14
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It's in the thread @whataboutbob posted and the reason it had a custom stroker kit. The TLDR is that the rod to stroke ratio is already poor. Stroking it makes it worse. The farther out on the crank you move the rod, the more angle the rod goes through as it runs through it's motion. The higher angles are hard on everything.
Interesting, thatís a really good point
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