MBE ignition software and laptop lead.

[fast freddie]

I have a 2004 Hayabusa powered SR4. When I do a track day the car runs well until about midday and then it develops a misfire. You have guessed it, when I take it to Radical it runs fine. I have replaced plugs, HT leads, coil pack, put a new connector on the crank sensor pick up and have just replaced the throttle position sensor. What I need to borrow or purchase from anyone who has one, is the softwear and lead to connect the MBE ignition into my laptop. So when it starts to misfire again I can diagnose the problem on site. I can also use this to set up the throttle position sensor. If anyone else has any suggestions, I would be grateful for any advice..
Many thanks.

[paulmj]

Tired fuel pump?

[RWDKurt]

MBE software is foc via Steve Broughton's website

http://www.sbdev.co.uk/Engine_Management_Systems/E...

The lead(s) are expensive though (also via SBD) - you are welcome to borrow mine if you are local (NE England)

I take it you've eliminated fuel surge as a possible cause?

[radicaltechnical]

hello, basically, as a test, if you go to a track and the car is misfiring, you can unplug ALL the MBE engine management sensors, EXCEPT the tps, and do a session with the car. if the misfire goes away, then it is a sensor causing the issue. plug them in one by one. it is long winded but sometimes these jobs can be. start by plugging the baro sensor back in. if the misfire is still present, then its plugs, leads, coil, engine condition, throttle body/ carb set-up, ecu, or TPS. This is to do only as a test to help diagnose the issue. don't run the car for any long length of time without the rest of the sensors.
please send me an email and I will send you a document on how to set the tps without the software or lead.

[austurbine]

Have you checked the battery voltage? I had a bad (hot connection) from the alternator to rectifier which comprises of three wires. The actual loom contains five wires. If you remove the heat shrink then you can make sense of the wiring routing. low voltage caused misfiring at high revs. I changed plugs,leads and coil before finding the issue was elsewhere. Low voltage caused many issues including faults with my farringdon dash (false loss of oil presurre) the engine ran hot due to a low voltage supply to the circulation pump. Once I rewired this circuit with larger wires and plugs, the car has run faultlessly.
Check the voltage when the engine is running preferably when the cooling fan is running (if fitted) you can check this at the Anderson plug on the side pod. Just a thought but the issue of misfiring took two tests at the track to resolve and a temporary hate for my SR 3

[MindBend]

Were the wires inadequate or failing?

[fast freddie]

Thanks to all for your advice regarding my SR4. After changing the fuel pump relay everything is now in working order and now back on track - literally! I am booked into Cadwell Park on 29th August with MSV - hope to see you there.

[noneedtolift]

Had the same with my Hayabusa engine. Only by pure chance (change of engine management system meant I had to run a different trigger wheel & new generator coilset) I found out what it was: Some wire of the generator had become loose within it's shrunk on insulation (inside the generator cover, directly on the coils) - it was impossible to see even with the cover off and the symptom only manifested itself when the car had been through a couple of heating up & cooling down cycles (track day seessions), it was fine otherwise and hard to reproduce.

Don't know if this helps but might be worth a try!