Strange noise at WOT

[cwcorris]

All,
I have a question for the group about my tune.

Background: I have a 2008 Jeep Grand Cherokee Overland w the 5.7L HEMI. 38k miles, 2.5 inch BDS lift. Running JK moab wheels with 265/75/17. I also have a K&N drop in air filter and I removed the stock resonator and installed the Airaid MIT. I also installed a oil catch can and cleaned my TB.

last week I received my 7137 predator. I did a quick adjust and increased the tire size settings to account for the larger tires I'm running... I then loaded up the 87octane tune. What a difference! throttle is way more responsive, shifts are firmer, and overall seems a lot quicker.

Here's my question: With the 87oct tune, I noticed that at WOT as it shifts from 1st to 2nd and 2nd to 3rd, just after the shift there is a "noise" that for lack of a better description sounds like a "whoosh". Like a car with a turbo sounds like when it shifts and the turbo dumps....Make sense? I believe the sound is coming from the exhaust system somewhere.. maybe some back pressure?

To confirm things, I reloaded my stock tune and did a short run. I did two WOT sprints and did not hear that "noise".

So, what am I hearing???? I'm concerned that it maybe a mechanical noise with my engine or transmission.

Another question, where can I find a listing of what all the abbreviations mean with regards to the predator settings?

Thanks!

[cwcorris]

65 views and not a single reply. Awesome. Winning!

[Mike_Levy]

Without hearing it, theres no way we can advise you. A tune will make the exhaust louder due to the advanced timing, but otherwise it should have no effect on it.

[abuelo]

Did U rised the shift points? Then it could make sense, because at higer than stock rpm there will be a lot more air flowing.....other than that the ds wont change the exhaust note in a considerable way

[cwcorris]

Abuelo,
No, I didn't make any changes to shift points.