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Eric S

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  1. Eric S

    G4X as data logger

    Is it at all possible to use G4X to data log factory ECU's behaviour? Specifically I'd like to log below signals; SGT and SGC (MX-5 NA6/8 CAS) signals - TRIG1, TRIG2 Engine speed (rpm, deduced by G4X from CAS signal) Battery voltage (already logged by G4X) TPS (volts) - AV1 ECT (volts) - AV2 MAF (g/s) - AV3 IAT (volts) - AV4 Injector 1 duty cycle (ms) - DI1 Idle air control valve duty cycle (%) & frequency (Hz) - DI2 Ignition 1 trigger timing (ms) - DI3 Link CAN Lambda Makes me wonder if a buffer is needed between passthrough/breakout PCB and G4X in case the input impedance of G4X inputs affects the signal (ever so slightly) for factory ECU.
  2. Been doing some back-to-back comparison between G4X and factory ECU on MX-5; mainly figuring out the idle air valve frequency and cold start behaviour. With G4X, the engine shutdown by turning the key from ON to ACC (or OFF) makes the engine shake and feels like the sparks want to fire (doesn't feel like a smooth shutdown compared to factory ECU, where I don't feel the engine shake at all when shutting down). It essentially cuts 12V to the ECU when key is turned away from ON and there's no dedicated digital input that tells the ECU 'I want to turn off the engine'. Is there something that can be done to allow more smooth shutdown?
  3. Out of curiosity, does NA6 and NA8 CAS have the same trigger pattern? Mine is NA8 actually.
  4. There was a minor fix on 6.20.17 for "VVTi MX5 trigger sometimes not syncing", but mine is not VVT so I figure it would not apply in my case. Almost flatten the battery trying to get it to throw trig errors but I got it, see attached. TriggerScopeLog 2 trig error.llgx
  5. After upgrading to latest version v6.20.33, my MX5 randomly fails to start with trig error counter going up. I so far only encountered this issue when warm starting, cold starts have been fine. Attached both my tune and log. Note that I upgraded from 6.19.37 from memory.
  6. Aha, forgot to dig into the help manual, thank you Vaughan. To my understanding the AUX9 and 10 are meant for electronic throttle (with its separate 12V supply), but I assume it has no effect on operation if used as general purpose low-side output? Also specs of "Auxiliary Output Specifications" applies to AUX11-16 as well (with 2A limit)?
  7. Is there a summary table of all outputs (AUX, INJ, IGN) current limits/characteristics similar to what Motec has in their user manual (as per below)? Primarily looking for current limits on INJ1-6, IGN1-8 and AUX1-16. Currently re-wiring my car, and want to reserve high current outputs for other functions if possible.
  8. Current setting is: Thanks you fellas, I was starting to think there's something else that was causing this Will try giving it more retard and more torque reduction time.
  9. Hello hello hello. I can't seem to get rid of violent car jerking when overrun fuel cut deactivates while coasting (in gear) to a stop -- this jerking motion is amplified when AC is running. If I apply small amount of brake when overrun fuel cut transitions from active (>1600rpm) to inactive (<1600rpm), the rpm drop is smooth but still can feel the car wanting to accelerate for that brief moment as fuel cut deactivates and injects fuel. As soon as rpm drops below as per the deactivation table (1600rpm), it injects fuel but that brings up the rpm above 1600rpm which cuts fuel, then drops rpm below 1600rpm only to squirt to bring the rpm backup above the deactivation rpm; the cycle repeats 3-5 times before finally settling to idle. Tried playing around with the overrun fuel cut settings, but having no luck. Attached the setting file and can provide the log file through Dropbox due to file size.
  10. Thank you, got it to work by configuring gear detection to analog and set source to AV12 (which doesn't have pin out on MX5 G4X anyway and won't go beyond ~0.02V), and set Gear 1 = 0.5V with +/- 1V tolerance. Nice work around. Tried the math block to average out the erratic speed reading, averaging made it better, but still it would occasionally display 300 km/h or something when travelling at 40km/h. Will be replacing the speedo cable soon.
  11. According to the PCLink's help file, the conditions for 'In Driving Gear' status to show 'Yes' are: Gear position is Reverse (R), Drive (D), High (H), Low (L), 1, 2, 3, 4, 5, 6, 7 or 8 and the Clutch Switch is not active and the Neutral/Park Switch is not active. My car has two switches (transmission neutral switch and clutch pedal switch) wired in series, so when: In gear & clutch pressed = 0 Neutral & clutch pressed = 0 Neutral & clutch de-pressed = 0 In gear & clutch de-pressed = 1 Currently configured two digital inputs: DI3 = Neutral/Park (wired in, and status changes accordingly as per above) DI7 = Clutch (actual wiring doesn't exist, configured this way to make Clutch input to show as 'Inactive'). Since 'In Driving Gear' status is not changing even when both 'Clutch' and 'Neutral/Park' status say inactive, in what ways can I use 'In Driving Gear' status? It looks like I still need gear detection (R, D, 1, 2 etc). I'm trying to use 'In Driving Gear' as speed lockout on 'Idle Speed Control Setup' to reduce the idle dip when clutch is pressed from a moderate rpm (say >3000rpm). The wheel speed sensor is very erratic due to worn speedo cable.
  12. Ah got it, good to know! I'll wire in to one of AV pin. Cheers.
  13. Ah I thought of wiring it into one of spare AV input, but it made me think because whenever blower fan in off position, 10-12V is applied to the input. Since I don't know the input range/limits of AV input, and the maximum allowable error low/high value that can be entered on PCLink is 5V, I assumed the limit is 5V. Can the voltage applied to AV input be read above 10V continuously? If so I'll go with this method otherwise Adamw's series-ed diode method might be the easiest solution.
  14. Can the input threshold of a digital input can be increased slightly? If it's fixed threshold, at what voltage will the input go 0 to 1? and the hysteresis if there is any? My MX5's AC blower fan knob is essentially a voltage divider and ECU only recognises fan speed 1 as HIGH and rest of speeds 2, 3 and 4 as LOW. So the AC clutch will only work when fan speed knob is turned to 1. Did some scoping, attached for future visitors. Since I'm making a custom adapter board for the "main" PCB, I can include some additional comparators with increased threshold (say 4V). I wanted to check if PCLink allows changing the input threshold; I vaguely recall Motec having the ability to adjust it but it's been long time. Cheers
  15. No worries. I'm still yet to have any starting/sync loss issues with beta firmware When the official version gets released, I'll update it and carry on. Thanks for your help!
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