Big trouble in GM land: SUVs and P/U

Hope my new one doesn't do it when I pick it up next week!

wilber1 wrote:

RamTC wrote:
It's not just the big SUVs, I have a 2012 Chevy Equinox, the buffeting effect really hurts the ears. Have to drive with rear windows up. Just something I live with, never thought about complaining. I just wish they would get a car right, then leave it alone, it's always something.....

Buffeting with the rear windows down is common to a lot of vehicles.

Yup, however in the article its describing the problem with ALL windows up. I read a similar problem with the long wheelbase Ford Transit, however it only does it right at 25 MPH. But I suspect its a result of the extreme efforts they are putting in to reduce drag.

Sounds to me like the Silverado problem is similar, but different from the SUV problem.

No issues here.

RamTC wrote:
It's not just the big SUVs, I have a 2012 Chevy Equinox, the buffeting effect really hurts the ears. Have to drive with rear windows up. Just something I live with, never thought about complaining. I just wish they would get a car right, then leave it alone, it's always something.....

Buffeting with the rear windows down is common to a lot of vehicles.

penguin149 wrote:
Last sentence, first paragraph mentions the Chevy Silverado and GMC Sierra

Yep, I missed that.
It seems strange that the Silverado would have the same problem as the longer roof of the Suburban.
Maybe the roof isn't the problem?

Lessmore wrote:
I think it must be. I put lots of highway miles on a 2014 Tahoe this summer. Never...never noticed any of these 'issues'.

Read the article. Problem only applies to year model 2015 & 2016. I wouldn't expect you to notice it on the 2014 you drove.

Last sentence, first paragraph mentions the Chevy Silverado and GMC Sierra

There is mention of the Silverado towards the end of the article. I have experienced the same issue with my 2015. It has been in twice. The first trip was a balance and rotation with no change. The second trip was a road force balance and two new RF tires. The first replacement wouldn't balance either. This cured the low speed vibrations. The problem persists at highway speeds. It will go back when I have another week to leave it.

Reminds me of the first years of the GMT400 platform where folks were adding
bug foils on the leading edge of their hoods...

Today's vehicles are mostly all tuned for lower Cx and wind-tunnel testing of scaled models

Why antenna whips have some sort of odd shape on them to reduce their vibration
GM even patented removal of the outside antenna and have them embedded in the
windshield glass

Most everything has some natural resonance frequency to them...then their secondary,
to tertiary and so on...

Engineers are always tuning them out, but with the complexity of today's vehicles,
that is getting tougher and tougher

The body to frame doughnuts sounds like the one to have the biggest bang for
the buck in tuning...IMHO