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Discussion Starter · #1 · (Edited)
I've had an FN2 for over 10 years now, it's been turbo charged and has a GearX gearbox but it's now in storage and I've moved on to a new project. Not a civic but still a civic at heart.

I've always really liked the K20 and always wanted to put it into something RWD. Everything jap has been going up in price thanks to covid tax so had to shop around and decided to go for a RX8 R3 at before they started to get really expensive. I bought a broken k20z4 engine out a fn2 and decided I would rebuild it for boost and stick it in this RX8 with a E90 m3 DCT gearbox.

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I spent all winter removing rust and sorting all the suspension components so that they will be brand new some mods are as follows:

  • Strongflex bushes
  • Track rods
  • Japspeed track rod ends
  • Ohlins coilovers
  • OEM lower arms and upper arms
  • Gravity Rear arms and reconditioned arms by me.
  • Everything that could be blasted and powder coated was done, if it couldn't be powder coated it got zinc primer and POR 15.
  • Work Emotion D9R wheels with AD08R Tyres
  • Factory underseal and rust removed taken back to bare steel then rust converter, zinc primer, POR 15, Gravitex underseal and top coat POR15.

The middle of the car will get done when I take the engine and gearbox out.

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I'm currently building the engine. I used Futuremotorsports to get the CSS and O-ring mods to allow me to run high boost. Engine mods are and will include:

  • Polished crank.
  • 9.5CR CP pistons.
  • ACL race main bearings standard size.
  • King Rod bearings standard size.
  • Manley H beam rods.
  • basic head build and refresh with 95lb springs.
  • CSS mod for 900WHP (claimed).
  • O-ring mod.
  • APR head studs.
  • Fd2 oil pump.
  • Clockwise motion Fd2 sump.
  • Prac works carbon fibre intake manifold from a Fn2.
  • Custom exhaust manifold/ exhaust system.

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I purchased a Pulsar GT3076R turbo with a tial exhaust housing as well:

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More to follow...
 

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Premium Member
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Discussion Starter · #2 ·
I also have a E90 M3 DCT gearbox with an adapter kit. The setup will run a 2.2 CDTI dual mass flyweel modified to fit the DCT. I will run a Mx5 LSD for now because it bolts straight onto the rear subframe and has a lower final drive. I just need a custom prop shaft and driveshafts. If the mazda diff fails I will look at getting an e90 rear subframe cut the diff mounts from that and weld it to the rx8 rear subframe as they are almost identical.

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The turbo I have is a pulsar GTX 3076R with a tial 0.82AR exhaust housing.

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And this is the goal for me, to have a similar install to the picture below:

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I know it isn't a civic build, I don't really use any other forum, so thought it might be fun to bring something different to the group.
 

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Heading for the naughty step
Alabaster civic 08 Type R
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2,785 Posts
Wow mate. That’s going to be a beast, wish I had the knowledge and bloody time to have a go at something like this than just going work and work🤣.
Them RX8 r3 are a good looking cars in its own right, fitting a turbocharged fn2 engine will be a blast.
You have to carry any mods to get the engine to fit?
So, looks like the engine will spin 90degrees around than how it’s fitted in the fn2?
 

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Premium Member
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Discussion Starter · #4 ·
Thanks man.

Yeah, the engine is swapped around 90 degrees. It needs to be slightly tilted for some reason as well once it's in. I've got a plate kit from a company called S.A.S motorsport, need to cut and weld the bulkhead and front subframe for the engine to fit. Should be a lot more reliable and get a lot more than the current 17mpg the rotary achieves haha.
 

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2008 Civic Type R
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974 Posts
Excellent plan, glad you're sharing it here!
 

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Champ White Type-R GT
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2,284 Posts
Holy crap mate what a beast :)

Was watching a yt vid on a fk2 powered mini.....but all that thru the rears on your project should be way more engaging to drive :) the mini was a bloody Exocet. The passenger was laying bricks with each gear lol
 

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Civic type R Championship white
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425 Posts
#wankelout!
I’m so loving this mate, the RX8 would be an absolute icon to this day if it wasn’t for engine reliability issues.
man’s sticking a boosted k20 in one hell yeah!

Used to have an RX8 231 pro drive, absolutely loved that car. This is going to be next level
 

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2010 Milano Red FN2 Type R GT #R22063
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382 Posts
Great fun! I had a 55' plate 192 RX8 in Velocity Red for a couple of years. I can't say I loved, it used a litre of oil every second fill up of the fuel tank (about 280 miles per tank) and gave worse MPG than my Ford Capri 2.8i and gave less feedback through the steering than the Ford KA it replaced. It looked lovely, but it was just too mechanically compromised to win my heart.
 

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Civic type R Championship white
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425 Posts
Great fun! I had a 55' plate 192 RX8 in Velocity Red for a couple of years. I can't say I loved, it used a litre of oil every second fill up of the fuel tank (about 280 miles per tank) and gave worse MPG than my Ford Capri 2.8i and gave less feedback through the steering than the Ford KA it replaced. It looked lovely, but it was just too mechanically compromised to win my heart.
I used to add 2 stroke to my fuel after it was mapped ahaha loved the smell, but yeah they were diabolical for fuel consumption!
My R26 I got after it felt like jumping in a diesel so much more efficient
 
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