12 l99 tuning question

[Ponchonutty]

So I did the DOD delete and upgraded the cam to a Tooley stage 2 along with associated parts plus a 3,200 stall converter. I had it dyno tuned at Hartsel Perforfmance in Tiffin, Ohio. He said he had an issue with the adaptive idle and had to shut it off. Once you’d go over 1.5mph it would kick the idle up to the point it felt like it would go 20mph all on its own. Anyone run into this? Other than that, it seems to run pretty well

[morepowerjoe]

I hate to say it but I think you need a new tuner.

[hunter1660]

I second the notion

[Bigdumogre]

Contact dyno Steve above ^^ he might be able to tune it for you. He has done several tunes for me and they are all amazing

[1fast]

Do you have access to hp tuners ? Post a log and your file best way for help. But yes its in the tune that needs fixed.

[Ponchonutty]

Originally Posted by 1fast

Do you have access to hp tuners ? Post a log and your file best way for help. But yes its in the tune that needs fixed.

HP tuners is what he used. I mean the car runs fantastic otherwise. He turned off the adaptive idle so it seems fine otherwise. He found it perplexing he had to though and he’s done a crap ton of tunes. The only other thing I’ve noticed is the Rpm’s will fluctuate when I have cruise set and engine load is reduced by going down a small hill. You’ll see it on the gauge and hear it go up and down maybe by 50 rpm until more load is given.

He said he loaded a base tune when all the work was performed since he didn’t know where the previous tune was at. Then while on the dyno he tweaked things from there. Said he didn’t notice the idle issue until he went to test drive it. I had an aftermarket ported throttle body he didn’t like so I bought a new factory one. He also found a small dead spot in the old gas pedal so I replaced that as well with a new one.

[Ponchonutty]

Originally Posted by dynosteve

tune is wrong

This is the same car I had issues with when I bought the box tune where you emailed me a file that had a tune on it. You are several hours away but might be able to make the trek depending how busy you are.

[Ponchonutty]

After doing some digging between my tuner and such it appears the calibration ID in my car is attached to a manual car, not an auto. To rule out anything else I’m going to see if I can get a GM dealer to load the correct file and start over again.

[acammer]

This sounds like min. airflow issues - needs more/proper tuning. That's a pretty mild camshaft and should be pretty transparent at anything over fast idle speeds.

[Ponchonutty]

Originally Posted by acammer

This sounds like min. airflow issues - needs more/proper tuning. That's a pretty mild camshaft and should be pretty transparent at anything over fast idle speeds.

Well the adaptive idle is separate from running down the road.

[acammer]

Originally Posted by Ponchonutty

Well the adaptive idle is separate from running down the road.

Adaptive idle is - but minimum air is not, and is set by gear. It can absolutely give that cruise-control effect, and is not uncommon when fighting bigger cams that really want some air to be "stable".

When set right, it should give you nice smooth transitions on and off the accelerator, but none of that cruise control effect. Some times in 1st gear you can use a little bit of that effect to help with parking lot bucking in stick cars, but then you risk flaring whenever you go to the clutch.

[Ponchonutty]

Originally Posted by acammer

Adaptive idle is - but minimum air is not, and is set by gear. It can absolutely give that cruise-control effect, and is not uncommon when fighting bigger cams that really want some air to be "stable".

When set right, it should give you nice smooth transitions on and off the accelerator, but none of that cruise control effect. Some times in 1st gear you can use a little bit of that effect to help with parking lot bucking in stick cars, but then you risk flaring whenever you go to the clutch.

Gotcha. I have noticed when driving down the road if I pop it into neutral it will idle around 1300 for a while then slowly come down. Once at a complete stop it then will hit the target of 850.

Going to GM dealer Monday to put all back to stock as far as the tune is concerned. My tuner is going to meet me there to get it so we can get it back to his shop then mess with the tune from there.

[acammer]

Originally Posted by Ponchonutty

Gotcha. I have noticed when driving down the road if I pop it into neutral it will idle around 1300 for a while then slowly come down. Once at a complete stop it then will hit the target of 850.

Going to GM dealer Monday to put all back to stock as far as the tune is concerned. My tuner is going to meet me there to get it so we can get it back to his shop then mess with the tune from there.

That flaring idle behavior going into neutral is another sign that the minimum airflow may be too high. Get a good return to idle (I play with this a fair bit as I'm usually working on tunes for stick cars) requires the right minimum airflow settings, and appropriate timing in the coast down, idle, and base spark tables.

As you noted, the adaptive idle for the the airflow side will not pull the throttle body closed when the vehicle speed is over the threshold, and the adaptive idle spark only has so much authority. That's why, when you come to a stop, the adaptive idle criteria for vehicle speed is met, and the idle speed drops to where it should be.

[Ponchonutty]

Originally Posted by acammer

That flaring idle behavior going into neutral is another sign that the minimum airflow may be too high. Get a good return to idle (I play with this a fair bit as I'm usually working on tunes for stick cars) requires the right minimum airflow settings, and appropriate timing in the coast down, idle, and base spark tables.

As you noted, the adaptive idle for the the airflow side will not pull the throttle body closed when the vehicle speed is over the threshold, and the adaptive idle spark only has so much authority. That's why, when you come to a stop, the adaptive idle criteria for vehicle speed is met, and the idle speed drops to where it should be.

Ok. I’m just worried my tuner won’t be able to get this right. Like stated before I’m taking it Monday to the dealership to have the factory tune reinstalled. He’s thinking someone had flashed it wrong since the ID number apparently doesn’t match for an automatic car but matches for the m6. I dunno but I’m not feeling good about this. Here’s the cam that’s in it. Also listen to this at startup. I had someone else say they think he’s tuned the “chop” in the idle to be more pronounced and that my car shouldn’t sound like that with this particular cam???? https://youtube.com/shorts/H-jJdiHzNOI?feature=share