[F1FTY]

Originally Posted by MazzaBL

There also hasn't been much info regarding what parameters the tune actually changes and whether or not it's actually necessary.

I did a log of the stock SS map and then the map of the GM tune and ran comparison in HPT. Here's the difference between the two:



I also have the airflow curve and MAF changes. I need to log IATs next.

The intake flows more air, but heat soak may be killing it.

[SS Life]

Originally Posted by F1FTY

I did a log of the stock SS map and then the map of the GM tune and ran comparison in HPT. Here's the difference between the two:



I also have the airflow curve and MAF changes. I need to log IATs next.

The intake flows more air, but heat soak may be killing it.

Can you post the differences?

[BrianL]

All we see is the screen shot of a file existing on your computer. Can the file be posted showing the differences? Or put into Excel and graph it out maybe?

[F1FTY]

Originally Posted by BrianL

All we see is the screen shot of a file existing on your computer. Can the file be posted showing the differences? Or put into Excel and graph it out maybe?

It's a screenshot of the comparison done on the two maps from GM. There is only one difference in the map settings - the MAF scale.

I can post up the curve differences and the difference in scaling and hz values, but it doesn't format well on the forums (tried before).

[Subcool]

I posted my before and after dyno results in the 1 le section my dyno numbers were lower after the gm tune.

[Ecchi667]

Tuning isn't really my forte, and I suspect a reflash is doing this to some extent anyway, but you could try unplugging the negative terminal on the battery and letting it sit for a couple of hours then plugging it back in and letting it relearn. Maybe something is confused somewhere between RAM and ROM, or whatever equivalent there is in there.

To put it a different way - try turning it off and on again.

[JKO]

I will try and get with dealership to see what the tune entails will also see if they can return it to the stock tune

[KingLT1]

You actually think gm would retune your car to make more power while retaining warranty? I would contact them, tell them you want it returned to stock because they slowed your car down or else you going to have a reputable shop tune it and they will be honoring the warranty or you will drive the car right up they're asses.

I did some research and Every dealership I contacted said a tune was not required...and that was the dealership selling the intake.

In my past experience it was never "required" to tune a car for a CAI. The MAF sensor is more then capable of seeing the air flow change and adjusting fueling. That is the primary function of the MAF sensor is it's ability to read airflow change and make the proper fueling adjustments so the car runs more consistent across varying conditions.

[RCF]

Originally Posted by KingLT1

You actually think gm would retune your car to make more power while retaining warranty? I would contact them, tell them you want it returned to stock because they slowed your car down or else you going to have a reputable shop tune it and they will be honoring the warranty or you will drive the car right up they're asses.

I did some research and Every dealership I contacted said a tune was not required...and that was the dealership selling the intake.

In my past experience it was never "required" to tune a car for a CAI. The MAF sensor is more then capable of seeing the air flow change and adjusting fueling. That is the primary function of the MAF sensor is it's ability to read airflow change and make the proper fueling adjustments so the car runs more consistent across varying conditions.

Not when the intake "tube" dimensions change... that's a constant built into the MAF table, that needs to be changed if the dimensions change. The MAF is not a direct flow meter.

It is not a "tune" as folks know a "tune", just a correction to the MAF readings to compensate so that it gets the corrected air flow reading and keeps A/F ratios as per factory specs.

[ohyeahjay]

can someone please take a picture of the inside of the tube that holds the MAF.

[1slowssm6]

the tune isnt the issue,issue is the cai sucks,the stock intake is perfectly fine on these cars up to fbo standards,i know its not a popular opinion but its mine,my car made fantastic numbers on stock airbox,wouldnt put one of these heat soaking piles of garbage on my car,and that goes for every cai made. Outside of jlt not one company has shown video proof, driving down the street,hood closed,of the iat not skyrocketing with their intake,oh they also have the only intake that REQUIRES a tune.

[TunaMelt]

For anyone following this and contemplating getting this intake without tuning it please take this into consideration. The MAF is basically acting as a flow meter to tell the engine how much fuel to use. These cars have a MAF that doesn't have its own tube. It gets inserted into a piece and whatever the inner diameter of that piece is plays a huge role. That MAF senses the air velocity going past and the computer then calculates the volumetric flow based on.... you guess it.... the diameter the computer believes to be installed. If you make the diameter larger then your velocity is going down but you've got the same flow. Hence the need for shifting the air flow tables to higher flow values for each signal generated by the MAF. In short, if you get an intake with a different diameter you better tune or you can have issues.

[KingLT1]

Originally Posted by 1slowssm6

the tune isnt the issue,issue is the cai sucks,the stock intake is perfectly fine on these cars up to fbo standards,i know its not a popular opinion but its mine,my car made fantastic numbers on stock airbox,wouldnt put one of these heat soaking piles of garbage on my car,and that goes for every cai made. Outside of jlt not one company has shown video proof, driving down the street,hood closed,of the iat not skyrocketing with their intake,oh they also have the only intake that REQUIRES a tune.

agreed!

[irocnroll85]

I just had my car on the dyno yesterday. Did one pull stock and another 2 with the GM cai WITHOUT tune and we went from 432 to 422 then another pull at 409. Torque stayed consistent right around 430.