ECU, Upgrades & Extras



This page has three main sections: 1) ECU Options, 2) Kit Upgrades and 3) Optional Extras.

1) ECU Options

As outlined in the Introduction, the kit contains all the mechanical parts required for the Honda engine conversion.  To get your engine running, there is a decision to be made about the ECU.  Firstly, to overcome the ECU immobiliser and, secondly, to allow the tuning (remap) of the engine for maximum power.

The three main ECU options are:
i) use the factory ECU with an immobiliser bypass unit
ii) convert the factory ECU into a mappable ECU with the Hondata K-Pro upgrade
iii) use another aftermarket ECU of your choice.

The electrical instructions provided with the build manual contain all the information required for ECU options i) and ii).  If you choose a different ECU per iii), then our instructions will help to some degree but it’s a much bigger DIY task.

Pricing for ECU options i) and ii) are as follows:

Option Description £GBP
K-Pro i) Hondata K-Pro ECU upgrade (latest v4 now available).   Highly recommended to help extract the maximum performance from your engine and our sports exhaust system, the latest Hondata K-Pro ECU package converts the factory ECU into a fully programmable ECU.  The upgrade includes fitting the K-Pro board, installing a USB port so you can hook up your PC/laptop to the ECU and the programming lead. You also get access to various base maps to get your car started, K-Manager software to adjust a multitude of settings (including enabling/disabling the ECU’s built-in immobiliser), onboard data-logging and bluetooth connectivity to name just a few features.  The standard ECU from your donor package will be required on an exchange basis or we can supply a donor ECU.  We recommend your car is mapped on a rolling road (dyno) once the conversion is complete. Hondata K-Pro v4 £529.17 + £18 shipping to/from Hondata. Used donor ECU  (if required)£85.
immob_del ii) Honda ECU immobiliser bypass box.  The original Honda ECU usually has a built-in immobiliser, so if you don’t want to go to the expense of a K-Pro or other aftermarket ECU, then you will need one of these “black boxes” to start your engine.  Not recommended for long-term use as your engine will run lean with our kit’s sports exhaust manifold.  £148

2) Kit Upgrades

As the kit is extremely comprehensive, we offer just a few upgrades alongside a range of Optional Extras.

Option Description £GBP
Engine preparation kitk20a2_close Get your donor engine into good shape before it’s fitted to your Lotus with the following parts:  Genuine Honda timing chain tensioner, timing chain, HAMP oil filter, set of 4 x NGK Iridium long-life spark plugs and a thermal exhaust manifold gasket.  £264.  See below for clutch and flywheel options.
Uprated fuel pumpS1 fuel pump This pump is a direct plug & play replacement utilising modern pump technology and supports power outputs up to 400bhp. Bear in mind the standard pump will be running at its maximum to fuel the Honda engine (and will be up to 20 years old). S1 (as pictured) £236, S2 £248.
Sports Cat upgradeSports-cat-small Upgrade from the standard decat link pipe to include a sport-spec catalytic converter. Helps to maintain high power while meeting emission test requirements.  £230
Custom powdercoat colourPowdercoat-colours Upgrade to a colour of your choice for the fabricated parts (black as standard, no cost option). Colour of your choice £30
Refurb’d valve cover A refurbished valve cover will help to show off your newly installed Honda VTEC engine.  Various colours and finishes available including bright red crinkle as shown. From £90 exchange (your old cover required or we can supply for +£55).
Custom hose colourStark coloured hoses Upgrade to coloured silicone hoses (black as standard, no cost option). Red, blue, yellow, purple, green, orange, white £25

3) Optional Extras

We offer a range of optional extras; some of these are highly recommended, others are simply highly desirable!   They can be supplied alongside our conversion kit or on a standalone basis.  Please also see our range of Honda K20 tuning parts.

Option Description £GBP
ITG Intake
ITG ARAB airbox and ITG Maxogen filter, to fit the Stark intake pipe.  £162

PLX wideband O2
The PLX unit is our recommended wideband kit for Hondata K-Pro users.  Comes complete with the AFR unit, a 52mm high-contrast OLED display gauge and the latest Bosch LSU 4.9 O2 sensor.  £196
Uprated rear toe link kit Strength for strength the lightest, stiffest, and easily the most durable kit available with unsurpassed bearing reliability. The rest of the kit is designed to last the life of the car. Comes fully assembled and pre-set with the correct bump steer shims where this information has been supplied by the customer, otherwise we use the Lotus recommended settings. Detailed fitting instructions are supplied. S1 with steel uprights £329, S1 Ali £439/£489, all S2 £329.
MFactory LSDMF_LSD_DC5 MFactory limited slip differentials (LSD): helical and plate versions available.  Available with or without new diff carrier bearings and the correct gearbox oil. Helical: £548,  with Racepack 1 or 2 £627.
Plate: £705. Carrier bearings £32/pair.  2L Torco diff oil £22.
Quaife LSD Quaife limited slip differential (LSD). This is another helical/torsion (not plate) diff which has been optimised RWD applications. £715
Clutch kitsEX_K20A_Stg2 Clutch kits.  We can supply Genuine Honda, Exedy and Competition Clutch Stage 1, 2 & 3 clutch kits at competitive prices. Genuine Honda £154, CC Stg1 £216, Stg1 Ceramic £219, Stg 2 £264, Stg 3 £295.
Lightweight flywheelFidanza_k20a_flywheel Ultra-lightweight flywheel, approx 4kg.  We recommend using new Genuine Honda studs (x8 required) when fitting.  £206 + £37 for 8x studs
Wishone bushesBLACK PF34-201blk PF34-202blk 2 Powerflex suspension bushes, full set of 16 bushes to cover all wishbones. Purple £230 (road series), Black £250 (track series)
Nitron dampersNitron_Race Nitron sports suspension for road, track or race use. £1050 for the NTR40  – road version (spring rates 400fr / 475re) or track version (450fr/525re).
Alloy RadFMLOTRAD_400


Upgraded alloy radiator (recommended for trackday and race cars).  Also does away with the plastic end caps of the OEM radiator which are prone to leakages.  £308
Mount Rubbers New Rover rubber engine mounts (engine & gearbox side). £96 for the pair

How to Order

See How to Order to obtain a personalised quotation.

Prices are in £GBP and exclude VAT & delivery.

Pricing effective 10th August 2017.

car_photo_266526_25 (Custom)

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