I believe that the bottom foam is harder(firmer) in the comp seats vs the touring seats(at least they do to me). That causes the bolsters to dig into the thighs.

Drilling the bolsters allow the bolsters to flatten out more, effectively widening the seat bottom, making it more comfortable for the 95% that drive their cars on the street and not on the track.

I have a C6 Z06 and I don't have a problem with the seat holding me in place, but I'm a 95 percenter. I believe that GM should design the car to meet the needs/wants of the 95 percenters and let the 5 percenters modify their cars to suit their needs/wants on the track. If I wanted to make my car onto a track car, I would put really good track seats into the car and not complain that GM screwed us(the 5 percenters) with seats that were designed for the 95 percenters..

disclaimer: the design of the C5 and C6 seats are terrible in that they allowed the bottom seat frame(aluminum) to cut/tear into the bolster foam and allows the wires/springs to cut into the bottom seat foam. $95 paid to a custom upholstery shop fixed that by covering the vertical fame rails with three layers of leather and then added a 1/2" x 1/2" x the length of the frame rail, strip of denser foam, plus adding a piece of carpeting between the wires/springs and the bottom seat foam, and then adding 1/4" of denser foam on top of the carpeting pad. After that repair, they function quite well, as I can drive on a city street or an Interstate highway all day(95% of my mileage) and have a comfortable ride, and still have fun in the twisties(5% of my mileage).

 

It's clear that it's not just height and weight that determine comfort, but something about build. I'm 6'2" 180 and the seat bottoms are uncomfortable, and I don't think it matters whether it's the gt or comp seats. (I have the comp seats, but sat in both before I bought. Both were uncomfortable. I think my hips are too wide for the seat.)

Maybe the solution is adjustable bottom bolsters? The top bolsters are adjustable, why not the bottom ones?

 

Good post. I never thought of it that way. I'm the 6ft 145 dude, and I like the curves and cornering around 1G. That driver seat holds me in just right. And I'm glad I never ate a lot of cheeseburgers.

 

I was a 6 footer 145 pounder when I was in my teens and twenties, but after years of cheese burgers and fries(and 4 heart attacks), I'm now 5' 11" and 215 pounds.

That's what another 50 years does to you. Very few people weigh at 75 years old what they weighed at 25 years old. Oh, and I eat a hearth healthy diet 95% of the time, but can't do a lot of exercise so I have trouble getting my weight down to a more reasonable 185 pounds.

 

Yep. Everyone is different. I am the same as when I was 18. My dad was the same way. But you never know. He died in his sleep at 63 years old. I'm 69 now and could be on borrowed time. That may be why I have so many miles on my Vette. Almost 31,000 and have only had it for 16 mos. Enjoy each day like it may be your last.

 

My Dad's youngest brother is like that. He is going on 89 years old and only has a slight tummy. He's 6'4" and weights around 200 pounds. He probably only weighs 20 pounds more than when he was in his 20's. His two sons are huge well over 300 pounds each, as are his grandkids.

Now my sister is just the opposite. She is 64 had really put on the pounds. When she was young she was petite and she has doubled her weight.