Idle, dashpoter adder parameter...?
 

I've got one of Rev's MegaSquirts on my 2004 MSM, locally tuned, and running great, except.... If I clutch it and let it return to idle (stop sign, etc.), the revs will dip to almost 500 rpm before the idle stabilizes. Occasionally the car stalls, but threatens to every time. It's my understanding that I can correct this via "dashpoter adder parameter". The problem being I have no clue what that is. If that's a safe and easy adjustment, I'll give it a go. If there's some risk and know how involved, I'll head back to the tuner...

Thanks in advance for any input you guys are willing to share. It's a huge help.

G

Post your tune and logs or it happening.

Its pretty easy to tune. It adds a % of of your idle duty on top of your current idle duty to "catch" the revs, then lets that extra idle duty decay over a short period of time (the decay factor) before entering closed loop idle.

The only problem I have with it - it doesn't really work for "clutch in". It only kicks in on throttle lift. That means if you're coasting down and have had your foot off the throttle for a bit, its already added the the duty and let it decay. So you clutch in and the revs nosedive. You can fix this by remembering to blip the throttle before you clutch in.

could be a number of reasons, dashpot not being the solution... post the tune and logs.

you need to learn how to tune yourself and save yourself thousands of future dollars...

I'm actually curious to see what the OP's CL idle tables look like because this sounds like opposite to the issue I was having where CL-idle would trigger and the valve would be too far open so the RPM would jump up. If the OP is slowing down and idle valve setting is below target idle rpm, then it would make sense that it dips down before coming back up. This is all assuming 1.5 though. I don't think that's what rev uses and I've seen him post about his disdain for engine states earlier, so I'm guessing everything I just said doesn't apply lol.