Rear support truss, worth it or not?

Talk and Tech about turbocharged 924/944/968 cars
Post Reply
MoeMonney
Posts: 90
Joined: Sun Sep 15, 2024 2:54 pm
Has thanked: 4 times
Been thanked: 37 times
Does installing a rear support truss increase the rigidity of the car? Is it worth installing and does it make a difference you can feel?

https://www.klaindustries.net/product-p ... oEVOHfe2hs
Add Pictures/Files
Screenshot 2025-10-05 at 7.22.22 PM.png
Screenshot 2025-10-05 at 7.22.22 PM.png (2.12 MiB) Viewed 445 times

#1

Top
User avatar
motoken
Posts: 55
Joined: Sun Jul 30, 2023 10:41 am
Has thanked: 20 times
Been thanked: 8 times
I've been looking at them as well. Following...
1986 Porsche 951
2016 Porsche GT4

#2

Top
User avatar
Spencan
Posts: 147
Joined: Tue Jan 25, 2022 11:05 am
Location: Gilroy, Ca
Has thanked: 129 times
Been thanked: 31 times
I made my own using a pan hard bar and connecting it to where the rear seat back locks in place. I used heim joints to do this. It has definitely helped in keeping my rear flat in the corners with the stock rear suspension. I was told this by friends following me through the local canyons, as well as by the how it feels. I made it and installed it before KLA came out with their version....
Add Pictures/Files
FF4207DC-2C44-4A87-BA79-B25949268AF7.jpg
FF4207DC-2C44-4A87-BA79-B25949268AF7.jpg (2.58 MiB) Viewed 406 times
'89 Turbo S-Glacier Metallic Mods: Evergreen Turbo-"Raptor" stage II, Bell custom intercooler, FTech 9 DME & OBD+, Tial 38 Wastegate, GFB EBC, A-Tune, 3" Turbo Back Exhaust, Cross-Drilled rotors, refreshed suspension

#3

Top
dr bob
Moderator
Posts: 625
Joined: Thu Jul 08, 2021 9:30 pm
Location: Central Oregon
Has thanked: 252 times
Been thanked: 247 times
Curious outside question.... Would the purpose be better served by a link between the shock towers? The body tends to be a bit more rigid there vs. at the seat belt anchors up in the B pillar, and closer connected to the side load from the suspension.
dr bob

1989 928 S4, black with cashmere/black inside
SoCal 928 Group Cofounder
928 Owner's Club Charter Member
Former Ex Bend Yacht Club Commodore Emeritus

Free Advice and Commentary. Use At Your Own Risk!

#4

Top
User avatar
Spencan
Posts: 147
Joined: Tue Jan 25, 2022 11:05 am
Location: Gilroy, Ca
Has thanked: 129 times
Been thanked: 31 times
That's what I was originally intending to do. However, I do not have a welder or the requisite skills to make an attachment to the shock towers, so I found the next best/easiest/lowest location...
'89 Turbo S-Glacier Metallic Mods: Evergreen Turbo-"Raptor" stage II, Bell custom intercooler, FTech 9 DME & OBD+, Tial 38 Wastegate, GFB EBC, A-Tune, 3" Turbo Back Exhaust, Cross-Drilled rotors, refreshed suspension

#5

Top
AudiSport
Posts: 196
Joined: Sun Jul 11, 2021 12:03 pm
Has thanked: 6 times
Been thanked: 68 times
According to KLA they did a bunch of measurements and data collection that showed chassis flex with pressure sensors on the bar to validate that is was really making it stiffer.

#6

Top
User avatar
blade7
Posts: 221
Joined: Mon May 23, 2022 4:17 pm
Has thanked: 25 times
Been thanked: 22 times
Spencan wrote: Tue Oct 07, 2025 12:20 pm I made my own using a pan hard bar and connecting it to where the rear seat back locks in place. I used heim joints to do this. It has definitely helped in keeping my rear flat in the corners with the stock rear suspension. I was told this by friends following me through the local canyons, as well as by the how it feels. I made it and installed it before KLA came out with their version....
My version fixes into place using the original seat back fixings. It definitely tightens up the rear end.
IMG_20251008_152832.jpg
IMG_20251008_152832.jpg (5.68 MiB) Viewed 324 times

#7

Top
Post Reply