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M2cupcar's 1990 Mazda Mx-5 Miata FE3 Turbo (35th) 
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LQFP112 - Up with the play
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Joined: Thu Feb 07, 2008 9:04 pm
Posts: 139
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


90 Miata | 302rwhp @ 6450rpm | 281rwftlbs @ 4800rpm | FE-dohc 2.0L turbo

Fri Dec 14, 2018 8:03 pm
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Joined: Tue Jan 15, 2008 2:31 pm
Posts: 15381
Location: Home sweet home!
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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Sat Dec 15, 2018 2:01 am
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