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Old 11-07-2014, 04:01 AM   #1
Stephen12ZL1


 
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four tires & wheels fit inside car in backseat area

I have been struggling with an easy method to transport my road course tires and wheels and wanted to try removing the backseat and see what fits. To my surprise, all four wheels/tires fit with room to spare straight across in the backseat area. Removing the backseat is a 10 min job so don't worry about it. The seat cushion just lifts up off its two front and rear clips. The seat back is retained by one central 18mm nut and 4 15mm screws on the sides. Here is a pic of them ready for the trip to VIR this weekend. My tires are 285/35-20 Toyo Proxes on a set of cheap wheels(no lighter than stock).
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'21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60'
'17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold)
'15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold)
'12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)
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Old 11-07-2014, 05:37 AM   #2
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Interesting. Difficult though with a cage or harness bar. I am honestly considering adding add a hitch to the car for the next season
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Old 11-07-2014, 05:42 AM   #3
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GM engineers wanted to remove back seats from the Z/28, but realized the seats add quite a bit of rigidity, and a cross bar would not be any lighter.

Long story short, you're losing precious body rigidity.
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Old 11-07-2014, 07:28 AM   #4
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Here is an exerpt from the GM press release concerning the rear seats in the Z28...

"The rear seats of the Z/28 have also been modified for weight reduction. A total of nine pounds (four kilograms) was saved by eliminating the seat-back pass through, as well as using high-density foam in place of the rigid structure of the seat back and steel mesh of the seat bottom."

"Quite a bit of rigidity"...I doubt it. A harness bar could easily be bolted in position for track days and removed quickly for transportation. I have used a hitch and cargo carrier and it proves to be a PITA and hassle. If I get more serious, the car is going on a trailer.
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'21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60'
'17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold)
'15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold)
'12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)
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Old 11-07-2014, 09:49 AM   #5
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Quote:
Originally Posted by crangie View Post
Interesting. Difficult though with a cage or harness bar. I am honestly considering adding add a hitch to the car for the next season
That's why I want to do. But have no idea what a small trailer costs??
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Old 11-07-2014, 01:40 PM   #6
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Quote:
Originally Posted by Stephen12ZL1 View Post
Here is an exerpt from the GM press release concerning the rear seats in the Z28...

"The rear seats of the Z/28 have also been modified for weight reduction. A total of nine pounds (four kilograms) was saved by eliminating the seat-back pass through, as well as using high-density foam in place of the rigid structure of the seat back and steel mesh of the seat bottom."

"Quite a bit of rigidity"...I doubt it. A harness bar could easily be bolted in position for track days and removed quickly for transportation. I have used a hitch and cargo carrier and it proves to be a PITA and hassle. If I get more serious, the car is going on a trailer.
I know that text from the press release. During the interview, he continues the talk about it, and states that they first tried to remove it, but realized it would cost rigidity, and a cross bar would not be any lighter, so they decided to put it back and gut the foam instead. I don't doubt it.
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Old 11-07-2014, 01:52 PM   #7
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so they left the frame but without the hinge and covered it up with foam instead of the hard almost luggage floor like backing?

Typing fat fingered on my GS3...excuse any sfelling mitcakes
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Old 11-07-2014, 01:57 PM   #8
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As far as I understand, they somehow reduced its weight by replacing its padding without removing from its chassis.
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Old 11-07-2014, 04:21 PM   #9
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Originally Posted by Jenner View Post
That's why I want to do. But have no idea what a small trailer costs??
Option1 with some work

Option2 almost ready to go
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Old 11-08-2014, 09:50 AM   #10
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Quote:
Originally Posted by Stephen12ZL1 View Post
I have been struggling with an easy method to transport my road course tires and wheels and wanted to try removing the backseat and see what fits. To my surprise, all four wheels/tires fit with room to spare straight across in the backseat area. Removing the backseat is a 10 min job so don't worry about it. The seat cushion just lifts up off its two front and rear clips. The seat back is retained by one central 18mm nut and 4 15mm screws on the sides. Here is a pic of them ready for the trip to VIR this weekend. My tires are 285/35-20 Toyo Proxes on a set of cheap wheels(no lighter than stock).
How badly do you have to compromise the front seat position(s)?


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Old 11-08-2014, 12:25 PM   #11
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Good question. I am 6'0" and there is some compromise. I am not in a "clown car" but definitely up a few inches. I can handle it for the 160 mile trek to VIR.
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'21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60'
'17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold)
'15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold)
'12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)
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Old 11-10-2014, 10:11 AM   #12
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update...front seat has much more travel if the tires are deflated...no surprise. Very livable for a long ride like this.
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'21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60'
'17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold)
'15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold)
'12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)
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Old 11-11-2014, 12:26 AM   #13
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Trailer has worked great for me, except the one time that I broke at the track.

This is a small Lowe's trailer with a couple of truck tool boxes attached. Higher quality than the Harbor Freight trailer I borrowed from a friend once.

IMG_5542 by solomontodd, on Flickr
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Old 11-11-2014, 10:27 AM   #14
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Just getting away from 12" barely-bigger-than-wheelbarrow tires seems like a really good idea if you care much for your trailer's wheel bearings long term.


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