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By HugoW
#46955
Hi,

I have my 2004 1.8 VVT engine running, but I have a lot of 'loss of connection' errors (says the person reading my logs). He says it has to do with the cam trigger not giving the signals the Speeduino expects. I understand that, as the VVT cam has three weirdly spaced teeth and I can only chose single tooth or 4-1 teeth in TunerStudio trigger settings. So, which one to chose? I now run with the single tooth setting.

Besides that, the VVT settings show a closed loop option, and the warning below it reads:
Please note that close loop is currently experimental for Miata patterns ONLY.
OK, my car is a VVT Miata, can I just use it? Does it know my cam trigger pattern? And how would I tune it if I do, as the VVT Table does not seem to change from Duty cycle table to for instance cam angle table?

Cheers,

Hugo
By dazq
#46962
The primary trigger setting must be what you have on the crank shaft.
closed loop vvt is an experimental thing as the message states and needs a single tooth only on the cam shaft as far as I am aware.
You must have both trigger wheel settings correct for anything to work properly.
By HugoW
#47003
Thanks, I need to change back to the stock Miata triggers, the 36-1 is not supported in combination with the cam trigger pattern. I just did and please check my new topic, as the car is now dead as a doornail.

Hugo
By pazi88
#47387
HugoW wrote:
Fri Dec 11, 2020 7:33 am
Thanks, I need to change back to the stock Miata triggers, the 36-1 is not supported in combination with the cam trigger pattern. I just did and please check my new topic, as the car is now dead as a doornail.

Hugo
It works just fine with single tooth at cam. Trick is to use correct cam amgle at 0% duty value. There is bug in current FW where cam angle can overflow and what you see in TS isn't necessarily the real cam angle.
By HugoW
#47391
OK, thanks, that's good to know. Unfortunately the Miata has a weird 3-tooth cam, so I cannot do that, yet. I hope in a future firmware Miata cam and crank pulleys will be available separately, so I can run 36-1 crank and Miata 3-tooth cam.

Hugo
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