All motor build? Stroke, ITBS, Ethanol?!?

[banzai-88]

Hey y’all, kinda new to this forum page but I have a question that I can’t 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? I’m 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 I’d love to hear y’all’s thoughts on the idea, cheers

[whataboutbob]

Look here to start: https://www.ft86club.com/forums/showthread.php?t=63901

[themadscientist]

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/

[gen3v8]

I`m pretty sure you can get a 2.4

[alex87f]

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

[banzai-88]

Originally Posted by themadscientist

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 hadn’t even seen that 2.3 kit before, Imma have to look into that, and I agree, definitely more expensive but I’m kinda just bored with FI builds, my two other cars are FI and I really don’t wanna jump on the bandwagon of just FI. I’ve ridden in a few FI Brzs and they’re really fun and nice but just not my cup of tea

[banzai-88]

Originally Posted by gen3v8

I`m pretty sure you can get a 2.4

2.4 from the new ones?

[PulsarBeeerz]

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.

[NoHaveMSG]

Not worth it. Stroking the FA20 is not a good idea.

[banzai-88]

Originally Posted by NoHaveMSG

Not worth it. Stroking the FA20 is not a good idea.

Can I ask why? I haven’t seen many people do it and I guess that’s a sign but I still wonder

[banzai-88]

Originally Posted by PulsarBeeerz

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 I’m not even going to bring it up lol

[NoHaveMSG]

Originally Posted by banzai-88

Can I ask why? I haven’t seen many people do it and I guess that’s 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.

[RToyo86]

Has anyone done rough costs analysis on a FA24 swap yet?

[banzai-88]

Originally Posted by NoHaveMSG

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, that’s a really good point