K-series
K23A1
K23A1 i-VTEC Turbo
Displacement
2.3L (2300 cc)
Configuration
Inline-4
Power
240 hp (180 kW) at 6000 rpm
Torque
260 lb-ft (350 N-m) at 4500 rpm
Compression
8.8:1
Bore × Stroke
86.0 mm x 99.0 mm
Valvetrain
DOHC i-VTEC
Aspiration
Turbocharged (single turbo, Mitsubishi TD04HL-15T)
Fuel System
PGM-FI
Redline
6800 rpm (rev limiter 6900 rpm)
Years
2007-2012
Factory Fitment
Acura RDX (first generation, TB1); RDX (TB2, 2010-2012); RDX (TB1, 2007-2009)
Notes
The only K23 engine; an early Honda turbocharged application built on a K24 block with a shorter-displacement bore, used exclusively in the first-generation Acura RDX.
Swaps using the K23A1
Guides mentioning the K23A1
Difficult
1-2 days
Civic Type R 5-Lug Brake and Suspension Conversion for the 1996-2000 Civic (EK)
Easy
15-30 minutes
Honda PGM-FI Fault Code Reading and ECU Reset (OBD0/OBD1/OBD2)
Moderate
2-3 hours
Acura RDX Automatic Transmission Fluid Flush by Triple Drain-and-Fill
Expert
6-10 hours (excluding paint and parts lead time)
Honda Fit (GE8) JDM 11-Pin Folding, Heated Door Mirror Retrofit
Difficult
6-10 hours
Honda Prelude (4th Gen) Projector Headlight Retrofit
Difficult
4-6 hours
Honda Fit (GE8) LED Taillight and Rear Fog Light Retrofit
Difficult
3-4 hours
Honda Fit (GE8) HomeLink and Ambient Light Retrofit Using an Acura TSX Overhead Console
Moderate
4-6 hours (plus sealant cure time)
DIY Amber City Lights in Honda Headlight Housings
Difficult
3-5 hours
Diagnosing Dead ECT, CMP and Wideband O2 Signals After a K-Series Conversion Harness Swap