18 GT rough idle after SCT tune

[bless0]

I have a 2018 GT Active exhaust with a JLT CAI with the plastic tube. I also have an H pipe installed. After installing the JLT CAI I used my SCT X4 to program the car. I selected 93 octane and JLT CAI (plastic tube). All other settings I left stock. Now the car has a vey slight rough idle and also feel that when I accelerate. Its not very noticeable but I can feel that slight sputter when accelerating. My question is, do I need a more detailed tune (map) since I have an H pipe ? I did this same exact setup on my previous 17 GT and used a different SCT X4 to tune it and never had an issue. This is a different car, a different CAI and a different SCT X4.

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[JakeLethal]

I have a 2018 GT Active exhaust with a JLT CAI with the plastic tube. I also have an H pipe installed. After installing the JLT CAI I used my SCT X4 to program the car. I selected 93 octane and JLT CAI (plastic tube). All other settings I left stock. Now the car has a vey slight rough idle and also feel that when I accelerate. Its not very noticeable but I can feel that slight sputter when accelerating. My question is, do I need a more detailed tune (map) since I have an H pipe ? I did this same exact setup on my previous 17 GT and used a different SCT X4 to tune it and never had an issue. This is a different car, a different CAI and a different SCT X4.

Silly question but have you checked to make sure the clamps and such are tight enough on the CAI that you installed?

 

[bless0]

Yes I double checked them this morning.

 

[Zelek]

Is this one of those crap SCT included tunes or a remote tune from a reputable place? That's likely the issue. Sounds to me like the MAF curve is off since the 2018 JLT is 120mm.

 

[bless0]

Its a crap included SCT tune yes!

 

[IrishStallion]

Your going to have to pony up for a custom tune.

 

[Zrussian13]

Did you use the maf gasket included with the jlt or the factory one?

 

[WildHorse]

Its a crap included SCT tune yes!

Drive it for a few miles. The shorts might need to learn.

 

[bless0]

I don't mind ponying up just as long as the car runs great. I've had it like this for over a week now. Its had plenty of time to learn.

 

[K4fxd]

Do a KAM reset and drive it, if it gets better great, if not..... order a tune.

 

[K4fxd]

I have an X4 and the mustang tune sucks ass.

Lots of knock and the trans is violent.

 

[bless0]

What is a KAM reset ?

 

[bless0]

Did you use the maf gasket included with the jlt or the factory one?

I just checke the MAF sensor. I took If off and there is no gasket between it and the plastic tube it bolts into. I checked the Stock intake and there is no gasket there either. Things that make you Hmnn!

 

[WildHorse]

What is a KAM reset ?

Since everyone is off in their own little world KAM = Keep Alive Memory. To reset it, disconnect the negative battery terminal for about 30 mins. Reconnect it, and start it up.

 

[shogun32]

I don't mind ponying up just as long as the car runs great. I've had it like this for over a week now. Its had plenty of time to learn.

the canned tunes are only good enough to turn the engine over and drive around the block. A proper tune is $150 or so. Otherwise shove the reducing collar in there and it'll at least run like a 3-legged race at the carnival. Who buys a tuner and NOT a proper tune?

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