Prevent Stalling and Idle Swings - It's In The Tune: EP3
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- Опубліковано 5 лют 2025
- In this video, we work on Joe Zacaggna's stick shift beast. He's suffering from an intermittent stalling issue when clutching to come to a stop. This video teaches you how to adjust the minimum dashpot clip and dashpot decay rate to create the exact rpm drop speeds you want.
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Nice ride!!!
This is gonna really help me get my decay rate set.
Be sure that your idle stop screw, ithbma, and neutral idle air are all dialed in first though. I’m going to make a video that shows an analysis of a9l calibration as it relates to the balance between neutral idle air, dashpot pre position, ithbma, min clip, etc.
The idle screw is set but I haven't dialed the other stuff in yet
Got damn you!!! Gotta love it......Very helpful info. I been havin it on my Stang for about 7-8 yrs now and love it, still learning more and more. Good Video....
We’re getting better and better everyday!
Like always, Another Great Video !!
Your analysis and correction procedures are as always dead on!
I enjoy your videos, as always...
James 04 L
great vid! i would move up that minimum mph for idle control to 10-12mph. on my project, one of the things i can't stand is the delay on returning to idle speed at a full stop. it does not return to my desired idle rpm until i'm under 5mph, so as you clutch and roll to a stop, you end up sitting there for a second with a high idle (+150rpm in my case) before it goes into idle speed control. not cool imho.
Why has it been a year since a last video?
Because I allowed a small number of terrible people in the foxbody community to mentally and emotionally bully me in online forums to the point I didn’t want to be alive. I then retired from tuning, removed myself from every single social media group and person online having anything to do with cars, and went back to my previous career. I’ll never return to tuning.
Well i hope every thing turns around for you. Don’t let the negative people bring you down. I’m sure they hate themselves and their lives.
I would have him datalog MPH as well, unless this is the car you were talking about with the trans with no VSS provision :P. I also would have had spark as well (can be an attributor to poor dashpot performance)
Another great video! I would assume cbaza would use the same principles. Are there any other specific scalers or functions to pay attention to?
I'm running a t4mo and started tuning the t4mo bin and the idle characteristics were terrible and read everywhere most people using a bigger injector (30lb here) started with the j4j1 bin with better results. They're right! I would still like to speed up the decay between shifts a bit though.
Cbaza is very different in the spark logic. But it does still have the neutral idle air function, dahspot decay, ithbma. largely the same. The isc transfer is a bit more complex in cbaza. If your fuel is dialed in and your neutral idle air/ithbma are good, then you can really focus on dashpot decay rate.
Hey Matt, can you explain how to get this to work with downshifting? If I push the clutch and let it coast, all is well. If I downshift, dashpot decays after about 3 -5 seconds when entering -1 iscflg. Then when I get slow enough, say 1800 RPM and 8 mph, there is no dashpot so it goes into underspeed / overspeed battle until it settles down in closed loop.
You may want to establish a minimum clip for dashpot in conjunction with a dashpot offset. Even if there is no dashpot left, the car shouldn’t go into closed loop idle speed control until you are also at least a certain number of rpms close to your target idle rpm speed. However there is another thing in the tune that can seem like idle speed control. That is the idle air adder vs. rpm function, if the car does dip low in rpms for any reason at any time, this adder will kick in and throw more air at the situation. And the amount of air, even from the factory, is pretty substantial. So if the car isn’t in speed control mode and that adder kicks in, the air goes away immediately after the rpms go up. So that can get caught in a swing where the control is less sophisticated when compared to true idle speed control logic. Could it be that function that is causing issues?