K20Z3 engine and 6-speed (K-swap)
into Civic (from Civic Si)

FG2 Civic Si 2006-2011
→
FG1 Civic 2006-2011

Yes: the K20Z3 engine and 6-speed (K-swap) from the Civic Si (2006-2011) fits the Civic (2006-2011) — difficult difficulty, modifications required.

Also fits Civic (FA1) →
Verdict
Fits.
Verified entry · modifications required
Verified ✓
Difficulty
Difficult
Mods
Required
Category
Engine

Installation notes

Yes — the K20Z3 and 6-speed from a 2006-2011 Honda Civic Si (FG2/FA5) fits a 2006-2011 Honda Civic with the R18 engine (FG1/FA1) using Hasport's FGK1 mount kit. Hasport states the kit is for R18 cars only and can also be used with K20A, K20Z and K24A engines. Using the 06-11 Civic Si transmission with Si shift cables lets the stock manual shifter work. Because the donor and recipient share a body, many interior and chassis parts are already Si-compatible.
ModsMods req.

Required modifications

Swap mounts: Hasport FGK1 K-series kit for 2006-2011 Civics that originally had the R18 engine. Transmission: compatible with RSX, EP3, 06-11 Civic Si, 08-13 Accord, 09-14 TSX and 12-15 Civic Si transmissions; Hasport says the 06-11 Civic Si unit is best and, with Civic Si shift cables, works with the stock manual shifter. Also needed: Si engine harness and ECU integration (immobilizer and drive-by-wire), Si axles or axles to suit the transmission, cooling, intake and exhaust. Automatic cars need a full manual pedal/shifter conversion.

Caution

Important caveats

  • Hasport states the FGK1 kit can only be used in models that originally came with the R18 engine.
  • Hasport's page is written for manual-shifter cars; converting an automatic adds pedals, shifter and wiring work.
  • The K20Z3 is drive-by-wire; engine harness, ECU and immobilizer integration with the R18 chassis must be planned separately.
  • The Civic Hybrid (FA3) is a different chassis setup and is not covered by this kit.

No guide yet — write one or browse all guides.

Reference

K20A specs → K24A specs → D14A1 specs → K20Z4 specs → LEB-H5 specs → R18Z9 specs → R18Z6 specs → R18Z4 specs → R18A2 specs → K24A3 specs → K20Z2 specs → B18A1 specs → K24A8 specs → K24A4 specs → K24W1 specs → K20Z3 specs → R18A1 specs → R18Z1 specs → K24Z7 specs → K24Z3 specs → K24Z2 specs → K24A2 specs → K24A1 specs → K20A3 specs → D16A6 specs → B18B1 specs → K20Z1 specs → K20A2 specs → D16Z6 specs → B18C2 specs → B18C7 specs → D16W4 specs → EA specs → EC specs → ED specs → EE 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 → R18A6 specs → R18ZC specs → R18ZF specs → PPL Cylinder Head → R40 Cylinder Head →

Done this swap?

Verify it and help the next builder.

Verified by 0 builders

Sources

2 refs
  1. 01 https://hasportperformance.com/products/fgk1-k-series-mount-kit-2006-2011-civic/
  2. 02 https://www.hybrid-racing.com/products/hasport-fgk1-k-series-mounts-r18-06-11-civic
Submitted by FitMyBuild research Added Updated

Not the swap you need? Request one →

Comments

(0)
Loading comments…