K20Z3 engine and 6-speed transmission
into Fit (from Civic Si)

FA5 Civic Si 2006-2011
→
GD3 Fit 2007-2008

Yes: the K20Z3 engine and 6-speed transmission from the Civic Si (2006-2011) fits the Fit (2007-2008) — difficult difficulty, modifications required.

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

Installation notes

Yes — the K20Z3 engine and 6-speed transmission from a 2006-2011 Civic Si (FA5/FG2) fits a 2007-2008 Fit (GD3) with the Hasport GDK20 bracket kit, longer K-swap shifter cables and swap-specific wiring and axles. Hasport describes the GDK20 kit as brackets that use the stock Fit mounts with a K20 engine and the RSX or 02-11 Civic Si transmission. Hybrid Racing says its K20Z3 Fit cables work with the stock Fit shifter and the K20Z3 transmission. This is a full engine conversion and needs wiring, ECU, axle and cooling work beyond the mounts.
ModsMods req.

Required modifications

Engine mounts: Hasport GDK20 is brackets only and reuses the stock Fit rubber mounts; Hasport lists it for a K20 engine with an RSX or 2002-2011 Civic Si transmission, and Hybrid Racing's listing of the same kit (HAS-GDK20) says it takes a K20 or K24. Shifter: Hybrid Racing sells made-to-order shifter cables, longer than the stock Fit cables, for GD/GE Fits with a K-series engine and the K20Z3 transmission. Also needed: engine wiring and ECU (including the drive-by-wire throttle), axles, cooling, fuel, exhaust and clutch hydraulics.

Caution

Important caveats

  • Hasport lists the GDK kit for 06-08 Fit while Hybrid Racing lists it for 07-08; the US-market GD3 Fit was sold for 2007-2008.
  • The Hasport GDK kit only works with RSX or 2002-2011 Civic Si transmissions.
  • Hybrid Racing's K20Z3 shifter cables are made to order and will not work with other transmissions.
  • The K20Z3 uses drive-by-wire throttle, so ECU and pedal setup must be planned.

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Reference

K20A specs → D14A1 specs → K20Z4 specs → LEB-H5 specs → K20Z2 specs → B18A1 specs → K20Z3 specs → K20A3 specs → D16A6 specs → K20Z1 specs → K20A2 specs → D16Z6 specs → D16W4 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 →

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Sources

3 refs
  1. 01 https://hasportperformance.com/products/gdk20/
  2. 02 https://www.hybrid-racing.com/products/hasport-performance-06-08-honda-fit-k-swap-mounts
  3. 03 https://www.hybrid-racing.com/products/hybrid-racing-shifter-cables-k-swap-honda-fit-k20z3
Submitted by FitMyBuild research Added Updated

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