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Finally had the proper 5 speed ECU programmed by Honda. I have been driving around with the 5 speed ECU for a couple weeks now and I have good news and bad news.
Good news: Overall the driving experience seems smoother than with the auto ECU. The 5 speed ECU seems to try to help with upshift rev matching. When I press the clutch to shift, the RPM now slowly drops to about where it needs to be in the next gear so it's easy to time shifting and releasing the clutch for smooth shifts. It's not stalling on takeoff anymore either. The one time it stalled with the new ECU was my fault because I forgot to downshift to 1st gear before taking off. Oops.
Bad news: The engine still surges somewhat at low speeds in low gears, but not as bad. Not sure why. The idle is still high when coasting too, but it doesn't lope anymore. It seems to idle at around 1500-1800 RPM when in motion, which still seems too high to me. For some reason, it seems to idle a little higher with the AC on. I'm not sure if something else is wrong or if that's just how these cars are. Since it idles fine when stationary, I assume that's just how these cars are and there's nothing I can do about it.
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