[radz28]

Originally Posted by Wuiquen

Ok I have a couple of questions. I got a 2018 ZL1 about a month ago with 10k miles. I have a couple of questions i was hoping you guys can help me with.

1. I am close to secure a set of ZLE wheels. The tires size for the front are 285/35/19 and the rear are 325/30/19. Will i have any issues with those tires sizes and the Magnetic ride? Will i have to recalibrate the Magnetic ride for the new wheels?

I believe the front tire size should be 305s, but I imagine you won't have and issues or anything. You can't really calibrate the MR (there is alleged hardware/software to do it, but it doesn't seem to be that effective or worth it so far).

2. If I get lowering springs, will i have to recalibrate the Magnetic ride? I know the ZLE tires will poke past the fenders, should i refrain from lowering the car?

A little of the same as above. Higher quality springs could be a help if you track or something.

3. Every time i shut off the car, as the car start to cool off, i can hear single noises from the exhaust. Probably near the cats. It sounds like when you oven is cooling off and you hear like a metal pop. Is this normal? I had a ZLE before and i don't recall this happening.

Just normal pinging sound.

4. I am quite certain there is some sort of buzzing upon start up for about 5-10 sec.. i don't really know how to describe this noise but it does go away.

I think you are hearing the HIDs warm-up.

5. Is there any way to figure out if the car was tuned in the past? I am only curious because I have some sort of shaking at idle.. for those with precious LS engine, it is like that subtle rumble.. i have that shaking in my Corvette but that car ha headers, intake and is tuned. I also don't remember having this shaking at idle on the ZLE.

If you have something like HPTuners, you could compare a stock file to your car. That requires hardware from HPTuners and someone willing to do it, so it could be expensive.

Just some thoughts coming from a new Gen 6/ZL1 owner...