JDM K20A (Type R) engine and 6-speed
into RSX (from Integra Type R)

DC5 Integra Type R 2001-2006
→
DC5 RSX 2002-2004

Yes: the JDM K20A (Type R) engine and 6-speed from the Integra Type R (2001-2006) fits the RSX (2002-2004) — moderate difficulty, modifications required.

Verdict
Fits.
Verified entry · modifications required
Verified ✓
Difficulty
Moderate
Mods
Required
Category
Engine

Installation notes

Yes — the JDM K20A from a 2001-2006 Honda Integra Type R (DC5) fits a 2002-2004 Acura RSX (DC5) with no mount changes, using a K20A2-style harness and a KPro or compatible manual ECU. Hondata's KPro covers both the US RSX ECUs and the JDM Type R PRC ECU, which is why this is one of the most common K-series upgrades. Wikipedia lists the JDM Integra Type R K20A at about 162 kW (217 hp) at 8,000 rpm with an 8,400 rpm redline, versus 200 hp for the 2002-2004 RSX Type-S K20A2. Base RSX owners fitting the 6-speed should use a 6-speed (K20A2) harness and ECU if they want the reverse lockout to work.
ModsMods req.

Required modifications

Mounts: none needed — the JDM K20A came in the same DC5 chassis in Japan. ECU: Hondata KPro supports the 2002-2004 RSX Type-S (PRB) and base 5-speed (PND) ECUs and the 2001-2006 JDM DC5 Integra Type R (PRC) ECU; Hondata states engine swaps must use a 02-04 engine harness and 02-04 transmission. Base RSX (K20A3, 5-speed): the K20A3 5-speed engine harness has no connector for the 6-speed's reverse lockout solenoid; Hybrid Racing says this is not necessary, but keeping that function needs a 6-speed harness and ECU. Harness: the JDM K20A harness is made for RHD cars and is shorter; most US cars keep a K20A2 (Type-S) harness. Keep the immobilizer working with the RSX ECU/KPro.

Caution

Important caveats

  • Hybrid Racing warns the JDM K20A engine harness is built for right-hand-drive cars, is shorter than LHD versions and lacks the oil pressure switch connector.
  • The K20A3 (base RSX) harness is for 5-speed transmissions and lacks the reverse lockout connector a 6-speed uses.
  • Hondata's 05-06 RSX KPro is only certified in an 05-06 RSX; for an 02-04 RSX use the 02-04 KPro/ECU.
  • Imported 'JDM K20A' engines come from the Integra Type R, Civic Type R and Accord Euro R; Wikipedia lists the Type R engines with PRC intake manifolds and the Euro R with RBC, so confirm what you are buying.

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Reference

B16A specs → B18C specs → F20C specs → H22A specs → K20A specs → K24A specs → C20AT specs → EV specs → D17A specs → K20Z4 specs → LEB-H5 specs → R20A6 specs → R18Z6 specs → B18A specs → D15A1 specs → EW5 specs → J25A specs → B20B specs → K20Z2 specs → B18A1 specs → B18C-00-Spec-R specs → B18B specs → B18C-96-Spec-R specs → B18C-98-Spec-R specs → B18C-SiR-G specs → K20A-RAA specs → K24A-RBB specs → C32B specs → C30A specs → L15ZF specs → L15BU specs → L13B specs → ZC SOHC specs → ZC SOHC Carb specs → ZC DOHC Gen2 specs → ZC SOHC VTEC specs → B16A SiRII specs → F18B specs → F20B-CF4 specs → F20B specs → K20Z3 specs → K20A3 specs → ZC DOHC specs → K20Z1 specs → K20A2 specs → EC specs → ED specs → EE specs → EG specs → EN specs → ER specs → ES specs → K20A1 specs → K20A4 specs → K20A6 specs → K20A7 specs → K20A9 specs → K20B specs → K20Z5 specs → PRB-A00 Cylinder Head → RNE ECU → RPM ECU → PRC ECU →

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Sources

3 refs
  1. 01 https://www.hondata.com/kpro
  2. 02 https://guides.hybrid-racing.com/Item/Engine_Harness_Selection
  3. 03 https://en.wikipedia.org/wiki/Honda_K_engine
Submitted by FitMyBuild research Added Updated

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