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20B street port NA Street/TRACK Build

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Old Jun 8, 2026 | 01:56 AM
  #1  
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20B street port NA Street/TRACK Build

Want to show my 20B NA project
Goal : some thing like 996/7 GT3 that is response fun to drive at track and street

Car: 1994 Rx7 touring
Engine Scoot sport ( Japan 🇯🇵)Turn key engine , street port 。Rx8 rotor rx7 housing chop Lower intake manifold point stock subframe and steering rack on custom oil pan
cooling:cross flow radiator , twin oil cooler
Transmission : S2 Rx8 6MT+ transmission cooler
clutch ATS carbon
final drive Rx8 4.4 Cusco MZ LSD
brake 99 spec , 929 MC SCS delta Motorsport ABS













Last edited by diyman25; Jun 8, 2026 at 08:29 AM.
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Old Jun 8, 2026 | 02:00 AM
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Old Jun 8, 2026 | 04:00 AM
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some on track action at 5/30
the reason I did not put GT wing is
this is more towards street build and I want maximum the look of flow so I install very rare long ducktail spoiler





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Old Jun 8, 2026 | 06:57 AM
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LOVE IT!!!
Beautiful build!

Steve
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Old Jun 8, 2026 | 07:56 AM
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Engine sit 5inch backward
and keep it NA is actually response better and lighter then 13B turbo setup


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Old Jun 8, 2026 | 08:35 AM
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Cool, glad you decided to do a build thread.

What is next?
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Old Jun 8, 2026 | 10:34 AM
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Exhaust is Scott sport custom equal length hand craft header
Ang hand craft 90mm Titanium catback in Taiwan









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Old Jun 8, 2026 | 10:36 AM
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Originally Posted by Johnny Kommavongsa
Cool, glad you decided to do a build thread.

What is next?
to share my concept and version of my perfect FD

what is next
is more track time fine tune the brake and suspension, goal is be as fast as 997 GT3 in Taiwan
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Old Jun 8, 2026 | 10:39 AM
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Literally one of the nicest FD's on here. There aren't many 7's in North America that are built with this kind of quality, thought, attention to details and care. Always appreciate seeing your work. I like it a lot, very well done sir!
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Old Jun 8, 2026 | 10:47 AM
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I was Suprise that my friend owner of scoot sport Koseki San tell me it Would be challenage to buy useable 20B core in Japan
but after think of it , u see more 20b swap out sides of Japan more , in Japan is Legal to swap the engine , but u need a expert to handle all the legal work
glad he find a good condion engine for me





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Old Jun 8, 2026 | 10:50 AM
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Originally Posted by Federighi
Literally one of the nicest FD's on here. There aren't many 7's in North America that are built with this kind of quality, thought, attention to details and care. Always appreciate seeing your work. I like it a lot, very well done sir!
after all these years been thought different style of Mod Rx7 and race car

I really think 20B NA street port is best balance setup
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Old Jun 8, 2026 | 11:03 AM
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one of most important thing on my 20B NA build is to accomplish true Front mid engine set up
As u can see blow pic, this is corner weight of me inside
with F 47.58% R52.42 % of weight bias
If u race or track rx7 u know how important to have more weight bias at back
more traction, less understeer = more fun and faster car at corner


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Old Jun 8, 2026 | 11:07 AM
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Here is sound clip of RE Amemiya catback ( no center muffler ) at Dyno
sounds wonderful and badass but too loud for street car once RPM pass 5000





Last edited by diyman25; Jun 8, 2026 at 11:10 AM.
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Old Jun 8, 2026 | 11:10 AM
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Tunnels run with re Amemiya exhaust
no center muffler

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Old Jun 8, 2026 | 11:21 AM
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nice!
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Old Jun 8, 2026 | 01:56 PM
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This is a great build!

Subscribed.
Please keep posting videos on your channel.
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Old Jun 8, 2026 | 02:09 PM
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When is the next flight to Taiwan!
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Old Jun 8, 2026 | 07:07 PM
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Being Rx7 owner and manual drivers for 25 years I know how sloppy manual transmission can really soil fun of driving , and don’t tell me u are building over 400whp with stock transmission it will just fall part at track
that why I. Pick this build with 20B street port
I use rx8 s2 6mt on my build might be rare in USA but pretty common in Japan , and being Rx8 owner I know it have better ratio for NA
with engine move 5inch back u can’t really use stock clutch hydraulic without really message the firewall so i use tilton inboard clutch throw out bearing









Last edited by diyman25; Jun 8, 2026 at 07:13 PM.
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Old Jun 8, 2026 | 09:45 PM
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Wow it works with the stock PPF? Did you say the steering rack is also in the stock location? Very cool.
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Old Jun 9, 2026 | 03:14 AM
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Car still retain PPF but is hybrid from RX8 and RX7


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Old Jun 9, 2026 | 03:15 AM
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Originally Posted by Narfle
Wow it works with the stock PPF? Did you say the steering rack is also in the stock location? Very cool.
is Hybird PPF of Rx8&RX7
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Old Jun 9, 2026 | 07:27 AM
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If you were to do this differently, what would you change?
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Old Jun 9, 2026 | 11:35 AM
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Originally Posted by Johnny Kommavongsa
If you were to do this differently, what would you change?
cermanic Apex seal
Seam weld body ( compare to Rx8 , FD chassic is too soft)
Traction control incorporates with Motorsport AbS
ATS 1.15 way carbon lsd


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Old Jun 9, 2026 | 11:40 AM
  #24  
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The reason I chose NA street port , I really really enjoy track, and I have 13B pp and Bp
i know how hard to keep those evil Engine civilization, let’s why on my 20B I only want street port

Last edited by diyman25; Jun 9, 2026 at 11:58 AM.
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Old Jun 10, 2026 | 08:51 AM
  #25  
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You had me at Scoot Sports. Very glad they're keeping up the good work.

Never give up mate!

OS giken spec S LSD has a good price now in Japan if you are looking for new lsd.
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