IAC Ramp Down in Holley Terminator X for Fox Body Mustangs

In this video, I discuss the IAC Ramp Down functionality within the Holley Terminator X EFI System. In working with a gentleman named Jay Mosely, we have uncovered an issue in the tune that causes the rpms to hang high for a bit every time he gets off the throttle and attempts to coast to a stop. This is caused by settings in the IAC Ramp Down functionality that request the idle air valve's duty cycle to remain high until certain conditions are met. This video gives you ideas for how to make adjustments to this part of your tune to get the rpms to drop quickly and smoothly into your target idle rpm range.
If you find these videos helpful, feel free to support the cause by sharing this video or donating a few "beer money" dollars to us at www.paypal.com...

[@apegarage6141]

ive got a manual car on a terminator thats stalling out after down shifting before going to neutral on approach to a stop. if i just drop it back to to neutral its fine only if i down shift do i have issues

[@smittysbad5.080]

I like video, the Holley has been kicking my butt

[@lochnessfox3441]

Let us all know what you come up with?

[@LeechMotorsports]

How so? Maybe I can help.

[@smittysbad5.080]

@@LeechMotorsports I put the system in with out doing much research got it figured out know. Thank you

[@nikwoac]

I'd be curious to see a follow up video on this one. I am struggling to get my ramp down dialed in, and curious what this guy's final tune looked like.

[@russellbroadwell]

Thanks! You did a great job explaining how everything works. I look forward to you future videos. I really like my Terminator X.

[@kylehasten8275]

Great video. Just got the terminator x installed in my 86. Never tuned anything before. These videos are a great learning help! Keep it up!

[@89foxix75]

Hi. I have my IAC parked position at 50% and ramp down at 4.2. Every time I come to a stop my rpms come down but blip back up to about 1400 then back down to normal 950 rpms. Even when I am parked and give it a bit throttle it always goes up then down and blips back up to 1400 - 1500 rpms then back to normal. Sometime it goes really low down to 850 then up again. Any suggestions?? Thank you.

[@LeechMotorsports]

I hate to say it. But the reason it automatically blips back up is because the deceleration logic in this system is lacking. When you cross back to your threshold above idle rpm, it’s going to open the valve 17-18% instantly. While the intent of this is reasonable, having a fixed and unavoidable iac increase is a little ridiculous. This is my single biggest complaint with the entire Holley efi system and will be the subject of a future video.

[@LeechMotorsports]

The logic I mentioned in my previous comment occurs regardless of which valve is being used.

[@stanley514]

Thank you for the lesson. Will you visit start up tuning one day? Cold or hot seams to be a struggle for most of Us. Thumbs up video.

[@LeechMotorsports]

That is one of my next areas to discuss.

[@95turbostang21]

Oh man I am so looking forward to more of the Terminator X videos. Ps hey matt we were talking about my Terminator X and you said to email you my Global file and tune I have been a little busy but I just figured out how to do that and I will send it your way later around dinner time thank you for your help you're awesome

[@LeechMotorsports]

Looking forward to it

[@5.0world3]

How do you keep your AC with the terminator x kit?

[@whatthefox302]

This video helped solve my issue thank you so much brother 😎

[@alhodge4051]

nicely done

[@lochnessfox3441]

I think my computer on my 89 is taking a hike. I may go this route.

[@LeechMotorsports]

Well if it is something you are already considering, it would be an ideal time to make the swap. I’m going to do a video soon to discuss this vs. a few other efi options for fox bodies to help people make an informed decision. I will say, though, Holley efi is by far the easiest system to tune that I have worked with.

[@LeechMotorsports]

You got it! I love looking through data logs and trying to solve problems.

[@lochnessfox3441]

I’m gonna keep an eye on all your input. Thanks for taking the time to help all of us out. Need more real-time people to help to make a complete and informative decision. I have fought this thing for 6 years. Enough is enough. Take care and talk to you soon.

[@LeechMotorsports]

If you need to contact me, hit up [e-mail]

[@FM-ec9ov]

Can I make my efi sound like a carb? Tap the throttle for a little rev and have it fall right down to idle without any ill effects?

[@LeechMotorsports]

To do this you’ll need to block off the idle air valve and tune without it.

[@russellbroadwell]

Thanks! You did a great job explaining how everything works. I look forward to you future videos. I really like my Terminator X.

[@hamzajuelz1956]

Sorry to be so offtopic but does someone know a tool to log back into an instagram account..? I stupidly lost my login password. I would appreciate any tips you can offer me!

[@finneganeric383]

@Hamza Juelz instablaster =)

[@hamzajuelz1956]

@Finnegan Eric i really appreciate your reply. I got to the site on google and Im trying it out now. Takes quite some time so I will get back to you later with my results.

[@hamzajuelz1956]

@Finnegan Eric it worked and I now got access to my account again. I am so happy! Thank you so much you saved my account !

[@finneganeric383]

@Hamza Juelz You are welcome =)

[@johndosh2469]

So easy a cave man can do it. Keep up the great work!

[@LeechMotorsports]

Does that mean you’re making the swap? LolZ

[@johndosh2469]

@@LeechMotorsports no, haircut lmao

[@LeechMotorsports]

Man I was looking in the mirror right before I made this one and realized just how badly I need a hair cut. I might open up a new donation page for that.