K20A2 engine and 6-speed (K-swap)
into NSX (from RSX Type-S)

DC5 RSX Type-S 2002-2004
→
NA1 NSX 1991-2005

Yes: the K20A2 engine and 6-speed (K-swap) from the RSX Type-S (2002-2004) fits the NSX (1991-2005) — difficult difficulty, modifications required.

Also fits NSX (NA2) →
Verdict
Fits.
Verified entry · modifications required
Verified ✓
Difficulty
Difficult
Mods
Required
Category
Engine

Installation notes

Yes — the K20A2 and 6-speed from a 2002-2004 Acura RSX Type-S (DC5) can be fitted to a 1991-2005 Acura NSX (NA1/NA2) with the Innovative Mounts 81550 conversion kit and Hybrid Racing's NSX-specific K-swap shifter cables. The NSX's engine sits transversely behind the driver, so a transverse K-series and its transaxle can occupy the same space. Hybrid Racing explains that the cables must exit over the front of the transmission, which its RWD bracket enables. Innovative says the K24 engine also fits with the K24A1 post mount, but only with a K20 gearbox.
ModsMods req.

Required modifications

Swap mounts: Innovative Mounts 81550 K-series conversion kit for 1990-2005 NSX (left, right and rear mounts; front mount optional). Innovative describes it as bolt-on with no chassis modification, for K-series engines with a K20 manual transmission; it does not fit K24 Accord/TSX/Euro R transmissions, and a K24 engine needs the K24A1 post mount. Shifting: Hybrid Racing's NSX K-swap shifter cables (for K20A2/K20A3/K20Z1 transmissions) used with its RSX shifter and RWD transmission bracket, because FWD K-swap cables are too short and route the wrong way. Also needed: axles, harness/ECU, cooling and exhaust.

Caution

Important caveats

  • Innovative's NSX kit does not fit K24 Accord/TSX/Euro R transmissions; a K20 manual transmission is required.
  • Normal EG/EK/DC K-swap shifter cables are too short for the NSX, per Hybrid Racing.
  • Replacing the NSX's original C-series V6 is a major, value-affecting change to a collectible car.
  • Vendor pages do not specify axle or ECU solutions for the NSX.

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Reference

K20A specs → K24A specs → K20Z4 specs → LEB-H5 specs → K24A3 specs → K20Z2 specs → B18A1 specs → C30A specs → K24A8 specs → K24A4 specs → K24W1 specs → K20Z3 specs → K24Z7 specs → K24Z3 specs → K24Z2 specs → K24A2 specs → K24A1 specs → K20A3 specs → B18B1 specs → K20Z1 specs → K20A2 specs → EA specs → EC specs → ED specs → EE specs → EH specs → EL specs → EN specs → ER specs → ES specs → ET specs → K20A1 specs → K20A4 specs → K20A6 specs → K20A7 specs → K20A9 specs → K20B specs → K20Z5 specs → K24V5 specs → K24V7 specs → K24W specs → K24W4 specs → K24W7 specs → K24W9 specs → K24Y1 specs → K24Y2 specs → K24Z1 specs → K24Z4 specs → K24Z5 specs → K24Z6 specs → PPA Cylinder Head → PPL Cylinder Head → R40 Cylinder Head → PRB-A00 Cylinder Head →

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Sources

3 refs
  1. 01 https://innovativemounts.com/products/90-05-nsx-conversion-mount-kit-k-series-manual
  2. 02 https://www.hybrid-racing.com/products/innovative-mounts-91-05-nsx-k-series-engine-mount-kit-75a85a95a
  3. 03 https://www.hybrid-racing.com/products/hybrid-racing-k-swap-nsx-shifter-cables-k20a2-k20z1
Submitted by FitMyBuild research Added Updated

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