Hello. Hopefully I am posting this in the right place.
I have:
*99 Civic
*H22A OBD1
*LS Transmission with 10.75 pound flywheel and stage 2 clutch
*Intake, Header, Exhaust
* P28 with Hondata S300 (files included).
* D series A/C compressor

I uploaded the file as it was from the tuner. I also added the idle issue from when the compressor comes on, to when I switch the A/C off. The idle jumps back and forth, and I am just reaching out here to see if there is anything I can do within Hondata or otherwise to improve this. If there is more info needed, then please let me know. I am getting ready to change the flywheel to OEM as a last ditch effort to correct the issue. It's getting hot and I need A/C!
Thank you.

https://drive.google.com/open?id=0Bx...1d4Z1JVd3dhNFE (H22A Dyno tune (original) Feb2017.skl)
https://drive.google.com/open?id=0Bx...3FCSzhFSUhmNUU (H2A ac idle issue after warmup 21apr17.s3d)

 

Anyone? Anything?

 

What injectors are you running on that setup? Are you running the 345cc injectors, 290cc injectors, or 240cc injectors that your map is indicating? It sounds like a deadtime issue to me.

 

Well, they are the stock injectors, from what I know. I haven't been able to get a straight answer on what size they are. I have seen conflicting answers to that on different posts, but 345cc was what I saw the most. We just replaced the clutch and flywheel back to OEM, and the fluctuation is a small amount better, but still pretty much allover the place. The drivability is much better (without a/c) as far as easing into gear. No more chatter. I'll start looking into deadtime. I don't know much about tuning, but I'm getting there. What would you suggest I do in the meantime? Thank you for your response.

 

So, after driving it today for a while, the issue has narrowed itself to this:
*Driving is fine. The A/C is ice cold.
*I put the car in neutral and coast to the light...idle is fine.
*Sitting at the light, the compressor is still engaged...idle is fine.
*Compressor disengages, idle increases a little and levels out.
*Compressor engages, idle drops, then jumps up, dips, jumps, etc.
*I turn the A/C off, at the button, idle jumps a little and levels out.
* I pull away from the light, turn the A/C back on and ice cold again.
*(repeat)

 

My suggestion is that you identify the exact injectors you're using and key in the proper dead times into the Hondata. You'll have to retune the car, but at least you won't have dead time issues. Grab a multimeter and test the resistance of the injector. If you're running stock prelude injectors, but you don't know from what year, the 345cc ones will be low resistance (somewhere around 3 ohms) whereas the 290cc ones will be high resistance anywhere past 10 ohms). Easy check to identify them. Once you identify them, then move onto putting in the proper deadtimes and retuning. That should solve your fluctuating idle issue.