This is a specially adapted ECU which allows the 2000-2005 S2000 to run from a
RSX ECU. The engine crank and cam sensors must be changed to equivalent
2006-2007 parts - see below.
The S2000 KPro includes a new or user supplied RSX (PRB) ECU adapted for the S2000, and
a wiring harness for the crank and cam sensors. It does not include the Honda
parts - see Mechanical Modifications below. All user supplied ecu's must
be PRB A01-A12 and in perfect working order. We will not use any other
ecu's for the S2000.
||S2000 K-Pro4 in a new ECU with wiring harness and bracket.
||S2000 K-Pro4 in a user supplied PRB ECU with wiring harness and
- Factory reliability for your S2000.
- Easy starting.
- Dash water temperature display functions normally.
- All the features of the K-Pro:
- Injector re-calibration.
- Fully mapped boost tables.
- Nitrous control.
- Boost control.
- And more...
See the K-Pro page for more information.
The following items must be replaced before the S2000 K-Pro4 can be used. These
parts are not supplied by Hondata and should be purchased from a Honda dealer.
Crank sensor 37500-PZX-003
Crank wheel 13622-PCX-013
TDC sensor 37510-PZX-003
TDC wheel 14112-PCX-003
Valve cover 12310-PCX-020
Drain plug washer (for PCV valve) 94109-14000
PCV valve 17130-PCX-003
IAT sensor 37880-P05-A00 (not required, but stock IAT
will read about 30 degrees hotter)
The approximate cost of these parts is $300-375.
Swapping the parts is relatively straight forward. Refer to the Helm manual
for more information, but in brief you will need to:
- Remove the accessory belt.
- Remove the water pump pulley.
- Remove the crank pulley.
- Remove the front timing cover.
- Remove and replace the crank timing wheel.
- Remove and replace the crank sensor in the timing cover, and reinstall the
- Remove old wiring to crank sensor.
- Install wiring harness from crank sensor to ECU.
- Reinstall water pump pulley and accessory belt.
- Remove the valve cover.
- Remove and replace the TDC sensor wheel (exhaust cam).
- Install the new TDC sensor and PCV valve in the new timing cover, and
install the new valve cover.
- Remove S2000 ECU. Install the wiring harness through the firewall
underneath the clutch master cylinder. If you have cut the wiring rubber
boot, seal it with silicone sealer.
- Install the RSX ECU.
As a bonus your will find that your brand new valve cover is not dirty and has
no oil stains.
S2000 K-Pro Upgrade
Once the K-Pro4 was up and running on my daily driven street car, tuning was a
snap. The high resolution maps on the K-Pro allowed us to quickly resolve
any fuel and timing issues, particularly those caused by our cold air intake
and its attendant intake resonance peaks. Of particular interest to me were
the additional features offered such as gear dependent ignition timing and
fuel trims. These are critical on the S2000 for getting snappy low gear
response while remaining safe under extended duration heavy loads in high
gear. The acceleration fueling and timing functions are also wonderful.
Because they use the existing Honda algorithms, tweaking these areas is as
simple as altering one or two variables.
While the car has not been back for its latest emissions certification yet,
a test only run at the local emissions shop showed compliance (including
passing all the OBD2 readiness codes), even though my catalytic converter
has a cracked catalyst block and needs to be replaced. This is wonderful as
full ECU control with emissions compliance is very rare on Hondas. Perhaps
my only regret is that with a mild NA street car, I'm not using a lot of the
extended feature set of the K-Pro (3 nitrous stages, boost control, etc.).
p.s. - The startup is like stock. That is something I am not used to on
standalone ECU systems for S2000s.
Immobilizer. The S2000 immobilizer is not supported.
Water Temperature. The S2000 dash water temperature display functions
as per normal. For an AP1 the second segment normally lights at 145 degrees F,
and the third at 165 degrees F.
Air Conditioning. In KManager you will need to select 'Use alternate
AC switch input'. No wiring changes need to be made. Idle up and enrichment is
as per the stock ECU.
Closed loop. The RSX ECU will run in closed loop using the S2000
primary oxygen sensor. Due to the RSX ECU normally using a wide band oxygen
sensor, in KManager you use select 'Use Secondary Oxygen Sensor for Primary'
(don't panic - the ECU is actually running off the S2000 primary oxygen sensor,
which has been routed through the RSX ECU as the secondary oxygen sensor).
Using a wideband RSX oxygen sensor is not recommended because the oxygen sensor
is expensive (as much as an aftermarket wideband) and substantial re-wiring is
required. The ECU can datalog aftermarket wideband controller which output a
analog voltage (via the ELD input).
KManager Configuration. The following parameters should be used
- Use only PRA ECU calibrations (PRA ECUs are the only ECUs which support
a narrowband primary oxygen sensor).
- Disable the immobilizer.
- Disable VTC.
- Disable the multiplexer.
- Select 'Use alternate AC switch input'.
- Select 'Use Secondary Oxygen Sensor for Primary'.
OBDII Scan tools. OBDII scan tools work normally, and is smog
compatible. Note that the S2000 K-Pro is not smog legal, and for
off road use only.
2006-2007 S2000. The RSX ECU is not compatible with the 06-07 drive by
wire, so the S2000 K-Pro cannot be used. Sorry.
User Supplied ECUs. User supplied ECUs must be checked before sending to
Hondata. Any damaged or faulty ECUs will incur a processing cost.
ECU Mounting. The ECU is the approximate size and shape of the S2000
ECU, and is located with the same orientation as the S2000 ECU, however it does
not have the mounting holes in the same location. A mounting bracket is supplied to mount the ECU in the stock
location. Note that this photo is from a hand made prototype - the finished
bracket will be laser cut.
Xenocron Tuning does not sell Hondata products outside the US
If you are an international customer, Please follow this LINK to find your nearest dealer