So, I've finally gotten the Miata to a point where I can start to really work on the tune (THANKS BRAINY!)
I was hoping to get some feedback primarily on my timing, but hey, spotting anything would be awesome. FuelVE is just freshly auto-tuned, but hasn't been touched beyond that.
Difficulty: I'd prefer to tune for 91 octane on a stock 1.8 engine (94 with 8.8 compression). 92 is the highest octane I can get around here, and some stations only sell 91. ------- hippies! Carrying around toluene has 0 interest for me unfortunately.
All right Brainy, start making fun of this map then.
Look at my little "pad" where spark is advanced, everything is else dropped:
Do this. I don't know how your turbo changes things, but my 1994 at 9:1 compression made the lower PW with 15.4:1 AFR and 34* of spark angle. You're on your own for the rest. You can probably load-up my table and yank 5* above 101kpa and live to tell about it.
I mean. Today, I went to set timing. I noticed serious timing jitter at 10* - changed fixed timing to 8* in MS, set timing to 8*, and timing was rock solid at 8*. Should I worry about the timing jitter at 10*, or should it be perfectly fine as is?
(Edit) A bit more. I've been taught that if you have a well running car, you should be able to hold a piece of paper near a car's exhaust, and it won't flutter much. The paper is violently fluttering, and a few times a second you hear a noise that is different than the rest of the exhaust. This noise is roughly in synch with the timing jitter.
I've used several sets of spark plugs to try to eliminate it. However, going colder only makes the noise worse and makes the engine go from shaking the car to violently fighting the whole car. Giving the car more timing makes it feel less worse. I've replaced the old coils with COPs, and this behavior is still there, although it runs more smoothly with COPs.
It's almost like I have one cylinder occassionally not firing or not fully burning, or occassionally misfiring. I'm not really sure of how to describe it, I'm getting a video of the car running now. This is something I've been struggling with for months, and if I get close to fixing it, the issue just seems to come back later.
WITH VIDEO AND SOUND! This is the least worst I can get it (Which is saying a lot, I can make it feel like the entire Miata is going to shake apart), and I cannot eliminate it entirely no matter what. So long as it does that random "popping", it's effing impossible to time at 10* - I get constant movement whenever it happens, not to mention AFRs going everywhere.