hondata s300

Installing an OBD1 ignition and a Hondata S300 into P28 ECU

This entry is part 29 of 41 in the series TrackDays EF7 HONDA CRX

You can install all the performance parts you want on your car – whatever the price or the quality – but the recipe is very sensitive to all changes, minor or major. And even if you can feel changes after installing an exhaust manifold or an intake this will never be as good as when combined with an ECU remapping.

The ‘map’ of an ECU is like tells the name the map used to guide the engine on the way of good ‘running conditions’. ECU receives a huge amount of parameters updated realtime and manages to send a new set of parameters to the engine with a high frequence (a lot of time each second).

Some of those parameters are very important and should be adapted carefully when modifying something inside and outside the engine unit. A lot of work has to be done by a tuner to adapt :

  • Fuel maps
  • Ignition maps

In order to upgrade the engine to a more powerful level but also to a still reliable level.

With modifications already done and the list of them still remaining to do on my car I decided to invest some money in a well known and evolutive management system. The ignition system generation on the Honda will so move from OBD0 to OBD1 and ECU will receive a brand new HONDATA S300 V2 circuit-board.

OBD1 P28 ECU with Hondata S300

The S300 has been bought new ‘in the box’. It is not yet installed into an ECU. I choose to install it in a virgin P28 OBD1 ECU but you can also install it in other Honda ECUs.

Yes I installed it all by myself. ‘Crazy guy’ will be thinking some of you but be sure that I told to myself the same thing when starting the job … If you have not the right tools or have a doubt on your welding skills go straight to a professionnal for this task.

Do what I say, not what I’ve done ^^ !

So here is the opened virgin P28 ECU. I took time to check everything and see where components I’ll have to remove / modify are located.

OBD1 P28 ECU with Hondata S300

Motherboard out of the case. Remember to work on a very very clean surface when doing electronic stuff like this !

The job consists in removing already installed components (resistors, capacitors, ..) or prepare empty slots to receive new pins or components. All informations given by Hondata are good.

OBD1 P28 ECU with Hondata S300

And … the job finished. Fast and easy huh !!?

No seriously I spent a lot of time doing all the job. Training on an old destroy ECU to remove soldered components, trying to do my best welds …

The main danger is this one : if you stay too long – or stay with a too hot soldering iron – the risk is to destroy tracks on the motherboard. And if you do this … just go and buy another ECU.

hondata s300

Just doing a blank assembly of the board to test everything. As you can see on the new red Hondata circuitry, there’s a small USB plug. You need to open your case to ensure a good way in for the USB cable.

OBD1 P28 ECU with Hondata S300

The totally finished ECU. Yes I’m not sure the black paint and Hondata sticker was necessary … but it’s nice !!?? ^^

Last thing to do, but not least : starts the engine with the modified ECU on it. Who wants to bet on my job ? There will be smoke or not !?

OBD1 P28 ECU with Hondata S300

So here is the rest of the installation. ECU ready (you see the sticker is very useful for watching through the bag ^^) and a brand new OBD1 distributor from rywire.

OBD1 P28 ECU with Hondata S300

Plugs between original and OBD1 ECU are differents as are plugs on the distributor. This one also comes from rywire.

OBD1 P28 ECU with Hondata S300

New OBD1 distributor.

OBD1 P28 ECU with Hondata S300

On the right are the adaptator harnesses for the distributor.

OBD1 P28 ECU with Hondata S300

Distributor installed on the car. Everything is connected and of course it will be necessary to set up the ignition timing on the first start.

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Article by: yogi