catsv7

I believe adjusting the idle/starup portion of the map can be tricky. We are dealing with small magnitudes on the commanded injector opening time. The actual opening is comprised of a ramp from closed to open, a ramp from open to close with a "flat" in between. The fuel flow passed is also dependent on the injector flow number and the fuel pressure regulator setting. On top of this scheduling are adjustments for sensed air temperature, pressure, battery voltage and if a cold start is detected. These modifiers may be different between our ECUs, further complicating comparisons. I have noticed that "small" injector opening time changes can cause big swings in AFR. I have been tweaking the map at idle beyond the one I provided. This is because I put in a smaller capacity alternator and cold air intake system drawing air in front of radiator. Once the engine is warm it idles at close to 1100 rpm with +/- 50rpm hunting.

@Vovchandr, send you a PM.

The catalytic convertor was also bunged up.

I do have the datalog software. To make it usable I had to purchase an older laptop running windows 98. I has taken quite awhile but the engine is running much better. I was combination of items including fuel injection. maps, dodgy alternator, dodgy engine sensors, incorrect fuel injectors.

Yes, still breathing.

I got some nice wheels from Jim.

Sadly, I am still seeking a replacement HPC wheel.

I am looking for a Caterham wheel, 16" x J7, ET19, PCD 4.25" (108mm) these seem to also be known as a 5 spoke HPC wheel.See attached example. I am located in Phoenix, AZ. TIA

Hi DaveD, I have sent a PM.

I don't know if all VDO senders have the same temperature/resistance relationship. However, I used a VDO 323095 Temperature Sender to measure oil temperature and sent the signal through a switch to my water temp gauge (2002 Caterham). I needed to add a resistor inline to make the displayed temperature correct. So this approach might be an option for you.

I have a 2002 Caterham with a Pectel T2 ecu. I have the Descprow software and with it I have sucessfully interfaced with the ecu. However, I would like to offload the recorded data from the ecu. I believe there is a Pectel program called "datalog" to help off load the data but I am not sure. Does anyone know for sure? If Datalog is the correct program, does anyone know where I can obtain a copy? TIA

Tom, Thanks for the additional AFR guidance.

Update from last weekend I put in the new 30lb high impedace injectors, drained the old fuel, changed the fuel filter, put in fresh high octane fuel. Another Caterham owner with the same ecu, TB and engine setup as I provided ECU maps to try. Then …. 1. First, I started the car with the old maps … it ran worse than before, AFR at idle >22, running rough. Trying to accelerate engine motor just cause it to quit. 2. Second, I load in the new ecu maps. I was doing some basic checking of the maps and noticed the TPS table lookup was reversed from my map. Probably just a matter of method used to wire the sensor. So I created a new version of the map with the TPS table from my old map. 3. I loaded the revised ecu map into my ecu and started the car. It runs very well, no more rough idle, AFR at idle ~12. A short run up and down the street had smooth throttle response, and responsive, no more back firing on throttle lift and AFR’s ~13 at 35 mph.

1turbofocus et al, I have contacted Cosworth and they confirmed that low impedance injectors are not compatible with the Pectel T2 (the ecu I have). I have 30 lb high impedance injectors "in the mail" so to speak. Thanks again for everyone's continuing interest and input.

More progress ... 1. I replaced the ignition/coil pack .... no measurable change. 2. I got a new DMM and re-measured the fuel injector impedance .... they are all low at ~2.5 ohms and consequently a miss-match for the Pectel T2. 3. I plumbed in a fuel pressure pressure gauge, it was reporting ~54 psi at idle 4. I got a LM-2 and measured the lambda at idle as 1.25, I raised fuel pressure regulator setpoint to 57.5 to get lambda to a safer value of 1.15 I need to replace the injector with a high impedance kind .... any suggestions/experience?