The turbo spools up based more on throttle position than rpm. What you're hearing is not likely the turbo, especially if you didn't hear it before, and it varies mostly with engine rpm.

Aren't the 2 related?

So I got my Jeep back today after F37. It runs fine, and I've already put my Edge module back on. However, there's a "whine." It reminds me of the old radio whine when you had a handheld radio in car. Ot like a small siren. I can't find any air leaks. It goes up and down with the accelerator, and you don't have to be moving. I've put 42K miles on this Jeep, and I don't recall hearing it before.

The dealer said it's the turbo. I said it doesn't kick in until ~1800 rpm. They said no, it runs all the time, but goes to full power then. I'm not buying this. Am I wrong?

Since I had the tranny pump replaced also. What drives it? The speed of the tranny or the speed of the engine? It is possible this is what the noise is?

Any other thoughts? My basic comment was that I have a 100K warranty, I'll just bring it back when I finish breaking whatever it is........Thanks

Of course, but what I'm saying is that you could make the turbo spin, say, 50,000 rpm at 2000 engine rpm, or at 4000 rpm depending on throttle input. Or it could be spinning slower at 4000 than 2000, again depending on throttle. There's not a fixed relationship between engine rpm and turbo rpm.

Let me guess, you now hear a strange "whooosh" and then it starts howling? Sorry, will give you the standard DCX answer "that's normal." I even went as far as inspecting the CAC hoses for a leak following the recall work. This is definately a charactoristic from the F37 tuning. I had something similiar on a bus engine once following a reflash which went away on the next reflash. Wouldn't worry about it.

Checking the CAC hoses is a good idea though. I'll do that today. Other than that, I'll just wait 'til I break something. Thanks.