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MarcD

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  1. speed signal bounce

    its late here in Hamilton too! 1.61 km / mile so you need to multiply 4000 by 0.621 = 2484 pulses/km thats 248400 pulses @ 100 km/hr 4140 pulses/minute 69 pulses /sec which is a bit different to both my 5.8 and your 178 !!! aarrgh!! its an aluminium disc with 4 magnets imbedded in it. have found some pictures on the web - it might be that I have pushed it jsut a little too close to the spinning disc. I'll check again tomorrow.
  2. speed signal bounce

    https://www.jaycar.com.au/glass-reed-switch-n-o/p/SM1002 I am led to believe it gives 4000 pulses per mile, with equates to 160.9 pulses per 100m if 100 km/h this is 5.8 pulses per sec I think you might be right regarding the ability to handle the signal speed what I can do, tomorrow, is to log DI7 and then produce a time plot... would that help? Thanks Adam, appreciate your input.
  3. speed signal bounce

    mx5 na 1989 1.6 using Link g4+ mx5 has mechanical drive speedo. on the back of the later NA model MX5 speedo is a reed switch that gives an output 4x per rev. all the hardware is there on my 89, just no reed switch. so I got one from jaycar. soldered it in and connected it to DI7. verified it is working. pullup resistor on, active edge rising, calibration 125. however, there is a lot of variation in DI7 output at road speeds above 20 km/h is there anyway to smooth it in real time ? or any ideas on how to eliminate the variation Thanks Marc
  4. MX5 Fuel pump always on

    closing this out for the last time! for MX5 NA 1989 1.6 I got a heap of those connectors from Mouser. I rewired fuel pump to be on Aux 5. I wired the purge solenoid back up to Aux 7 and now use the purge solenoid as a cold start air device - small air filter on one opening, other to the inlet manifold, and solenoid activated below 40C. works a treat! also had the separate questions around the AF gauge and where to tap the 12V feed from to only be on when engine is running. Wanted this as when downloading big ECU logs, or fiddling with link, the ECU needs to be on for a while but not engine running, which meant in the old configuration, the AF sensor heater was also on - not good for longevity. Turns out the correct wire is the Blue/Red on the fuel pump relay (yellow re;ay and connector) up above the accelerator. hope this helps someone else in future!
  5. MX5 Fuel pump always on

    thanks Adam
  6. MX5 Fuel pump always on

    are they 3.2 mm with 2.5 mm cable entry?
  7. MX5 Fuel pump always on

    finally got round to this. so for closure.... there are no terminals inside the ECU connector on pin 17 (on a number of them actually - any idea where i can get them from for future?) so, as I am not using the purge solenoid, yellow/red wire into pin 15 / Aux7, I used this. configured as Fuel Pump. working perfectly. thanks Adam
  8. 3d accelerometer

    is there a plan to enable enhanced graphics for this? I've got the g4+ pnp for Mx5 na 1600
  9. 3d accelerometer

    looking at interfacing a 3d accelerometer into the G4+ the XC4478 for arduino (https://www.jaycar.co.nz/medias/sys_master/images/8970988781598/XC4478-dataSheetMain.pdf ) is a great little unit. would interface nicely with the 5v from link. just need 3 analog V inputs - the expansion ports only do 2, I haven't got my manual with me at work, so are there 3 available channels on the main harness / plug to use?
  10. Dwell and spark duration MX5 NA

    thanks once again Adam! cheers
  11. Dwell and spark duration MX5 NA

    doing a bit of research on the stock 1.6L MX5 1989 NA seems the standard ECU has 5ms dwell and 8ms cranking dwell. stock spark duration is 0.5sec G4+ mx5 map has it set at 3.5ms dwell and increasing with decreasing battery voltage, and a1 sec spark duration. I cant see anywhere for a cranking dwell input (unless during cranking assumption is battery voltage will drop below 12V?) do you recommend to change the values to the stock numbers? car is basically stock apart from intake and G4+ cheers
  12. CLL fuel correction %

    looking through some logs I see that the Closed Loop Lambda is active in a number of locations. I note that the scale is fuel % is it the same % as main fuel table? i.e. if it shows CLL has added 3.4% fuel in a certain cell, if I retrospectively go into main fuel table and adjust the number by that amount, it would mean the fuel table is then tuned to match the AFR table? Thanks Marc
  13. MTX-L best place for 12V feed

    currently MTX-L is wired into a switched live under the dash, means it comes on when key in run position. not ideal if engine not running have g4+ PnP on MX5 na 1989 1.6L possible to wire it into a switched 12V from ecu (thinking the same / a similar pin as the Fuel pump?) so that its only on when engine is running. thanks Marc
  14. IACV delete

    turns out the IACV is faulty. have removed from system, along with the Air valve, and idle is now rock steady at 850 rpm. now I need to spend some time and work out the warm up enrichment table! thanks Marc
  15. MX5 Fuel pump always on

    thanks! I'll give it a go this evening. cheers Marc
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