M2cupcar's 1990 Mazda Mx-5 Miata FE3 Turbo (35th)
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Author:  m2cupcar [ Fri Dec 14, 2018 8:03 pm ]
Post subject:  Re: M2cupcar's 1990 Mazda Mx-5 Miata FE3 Turbo (35th)

I've been driving the Miata regularly. I have yet to put down a solid stone cold start tune. Seems like all my efforts just make it worse. Otherwise the car runs extremely well and is putting down good power. I upgraded my wastegate spring and have been running on that, yet to move on to tuning electronic boost control. Boost runs 11-14psi now. It pulls hard to the rev limit now with the upgraded intake manifold and larger throttle body. Makes short work of the little tires. :D


Author:  Fred [ Sat Dec 15, 2018 2:01 am ]
Post subject:  Re: M2cupcar's 1990 Mazda Mx-5 Miata FE3 Turbo (35th)

There's a few factors we can fix to help your cold start:

1) delayed prime to wait for fuel pressure and/or prime on cranking instead of prime on key-on (which is dangerous on some setups that see many power cycles before starting, and wasteful/damaging on a car parked and using things requiring key intermittently).

2) distinct cranking fueling controlled only by TPS/CHT and maybe RPM?

3) post start enrich of some sort to fill the hole after starting before the mixture and fuel held on physical surfaces have stabilised/saturated

4) a warm up algorithm that's based on load, ie, less % under load, more at idle, etc, or maybe just a linear one that doesn't care, and only adds X fuel?

Other Rob and I have been pushing the finalised/finished firmware firmly closer to the bastardised branch that you're running, so I'm hopeful to get a half dozen or more of us running the good stuff before end of next year, and hopefully before your event.

Sweet photo and funny vids :-) Would love to see it with some traction and a 1-5 run :-D

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