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-   -   From 4G63 to Miata99-00, no start (https://www.miataturbo.net/megasquirt-18/4g63-miata99-00-no-start-104515/)

Pb81 01-15-2021 07:43 AM

From 4G63 to Miata99-00, no start
 
Hello everyone, i'm facing a weird issue on my NA vvt swap.

I had my car running smoothly with CAS setup, MS2, VVT engine and 4G63 trigger setting. In order to enable the vvt feature with the incoming ms3 i moved from CAS to crank and cam sensors, switched to Miata99-00 trigger setup, checked trigger offset with strobo and measured TDC offset to 8 (i even tried from 0 to 10 with no success) but i couldn't start the engine at all. The only way i can start the engine is setting cranking pulsewidth over 450% or doubling reqfuel setting from 6 to 12. Of course that last options makes the VE too rich. switching back to CAS it works just fine again with exactly same setup and fuel setting.

Is there something about Miata99-00 setting that could cause that behavior?

Pb81 01-16-2021 04:17 AM

4 Attachment(s)
I add maps and cranking log, please let me know if something more specific in matter of logs is needed :)


bmxfuel007 01-17-2021 05:13 PM

from my experience from switching from CAS to 99-00 sensors and looking at your Ignition Options, I would change:

Skip Pulses = 3
Ignition Input Capture = Falling Edge
Spark Output = Going High

Try that out and see if it helps
If it still doesn't start, I would check the air gap between your crank sensor and the timing wheel. Shouldn't be more than a credit card's width


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