November 14, 2018, 12:16:19 AM

Author Topic: LT1 in an 85 GSL  (Read 19376 times)

Offline freeskier7791

Re: LT1 in an 85 GSL
« Reply #150 on: June 19, 2018, 07:18:04 AM »
The body side rear sway bar links (Gen 2 Camaro aftermarket bars) did exactly that your pictures show.  Was not binding per say but an alignment issue. The bar mount on bar was not fixed and would slide sideways point loading upper mount.  urethane crumbled in a week, went solid aluminum but it rattles.  UHMW and bar locaters on the rebuild.

Was the steel core in the bushing even with the urethane? It looks as if the step was wider and torqueing the ears may have squashed, torn the step.


DD

The steel cores are intact, but they may not be long enough, allowing the urethane to tear on the ears.  Energy Suspension is looking into it for me, they were surprised I was having issues, but I think they really don't know that this suspension has issues to begin with.

I am curious as to why I am having this issue all of a sudden.  I am wondering if going to a 235/45/17 from a 205/50/15 has an effect.  more grip + higher COG = more roll and binding?

Offline DDv8

Re: LT1 in an 85 GSL
« Reply #151 on: June 19, 2018, 09:08:43 PM »
Did you get more body roll with the new set up?  If so is roll binding as stated above by others.  It may also be side loading the axel harder and the watts link is not holding location enough causing a point load.

DD
86fc old school 327, T5, converting to 8.8 tbird

Offline freeskier7791

Re: LT1 in an 85 GSL
« Reply #152 on: June 20, 2018, 07:26:58 AM »
Did you get more body roll with the new set up?  If so is roll binding as stated above by others.  It may also be side loading the axel harder and the watts link is not holding location enough causing a point load.

DD

I could not feel any more body roll with the new set up.  I suspect it was the increased side loading.  Energy Suspension was pretty surprised I had these issues and are looking into it.  Maybe I will get some free replacements to use when I make my new suspension arms.

Offline rk970

Re: LT1 in an 85 GSL
« Reply #153 on: June 20, 2018, 01:36:15 PM »
It is very well known and documented about 1st gen rear suspension problems.  They also will snap off the watts link mount on the axle.    The bushings failed due to plastic deformation.   The short upper links that angle inward and down. (if you continue the line were they intersect it wants to create a roll center). A watts with asymmetrical links mounted hi and on the right creates another roll center.   As one side moves up toward the bump stops it wants to roll the pinion down (due to the short upper arms) and the opposite side (as it moves away from the bump stops) wants to roll the pinion up.  Something has to give, mounts get ripped out of the body, watt link mount pulls out of the axle or you get snap over steer when it locks up mid corner when you hit a little bump.. 
Let me make this clear, the urethane bushing were over loaded and failed.  The stock bushing are very compliant and move a lot..  You are also putting 3x the hp and 4x the torque of the stock 12a  through it.  185/70r13 tires will also lose traction before ripping the car apart with the stock setup..
rk

Offline freeskier7791

Re: LT1 in an 85 GSL
« Reply #154 on: June 21, 2018, 07:04:15 AM »
It is very well known and documented about 1st gen rear suspension problems.  They also will snap off the watts link mount on the axle.    The bushings failed due to plastic deformation.   The short upper links that angle inward and down. (if you continue the line were they intersect it wants to create a roll center). A watts with asymmetrical links mounted hi and on the right creates another roll center.   As one side moves up toward the bump stops it wants to roll the pinion down (due to the short upper arms) and the opposite side (as it moves away from the bump stops) wants to roll the pinion up.  Something has to give, mounts get ripped out of the body, watt link mount pulls out of the axle or you get snap over steer when it locks up mid corner when you hit a little bump.. 
Let me make this clear, the urethane bushing were over loaded and failed.  The stock bushing are very compliant and move a lot..  You are also putting 3x the hp and 4x the torque of the stock 12a  through it.  185/70r13 tires will also lose traction before ripping the car apart with the stock setup..
rk

That makes total sense.  Have you done any modeling of the stock rear suspension?  could you not just get rid of the watts link and make more triangulated upper arms that are longer?

Offline freeskier7791

Re: LT1 in an 85 GSL
« Reply #155 on: July 12, 2018, 09:45:00 AM »
I made a video about the suspension issues, please check it out if you have time

https://youtu.be/8I56yVET5bo

Sent from my SM-G920V using Tapatalk


Offline freeskier7791

Re: LT1 in an 85 GSL
« Reply #156 on: July 27, 2018, 04:14:01 PM »
Here's another video just showing the whole car, check it out if you want


https://youtu.be/EaOQv1uRgdI

Offline digitalsolo

  • Administrator
  • Top Fuel
  • Location: Fort Wayne, IN
  • Posts: 22277
  • View Gallery
    • View Profile
    • LS1FC.com
Re: LT1 in an 85 GSL
« Reply #157 on: July 27, 2018, 06:52:29 PM »
Looks good!
Blake MF'ing McBride
1988 Mazda RX7 - Turbo LS1/T56/ProEFI/8.8/Not Slow...   sold.
1965 Mustang Coupe - TT Coyote, TR6060, modern brakes/suspension...  project car
2013 Focus ST3 - Stage 1 BPU

Offline freeskier7791

Re: LT1 in an 85 GSL
« Reply #158 on: July 27, 2018, 09:21:21 PM »

Offline FC3S Murray

Re: LT1 in an 85 GSL
« Reply #159 on: August 12, 2018, 12:59:42 AM »
Cool vid.


From one Dad to another, you can never have too many kid toys in the garage. Enjoy those, they grow up too fast and before you know it the toys are gone and the kids want nothing to do with you :(
[smg id=9386 type=full align=center caption="82a12596 bbff 4215 91f6 83f370e7eb35 zpsdd7bd7b2"]

7 years and still running STRONG!

Offline freeskier7791

Re: LT1 in an 85 GSL
« Reply #160 on: August 12, 2018, 08:12:29 AM »
Cool vid.


From one Dad to another, you can never have too many kid toys in the garage. Enjoy those, they grow up too fast and before you know it the toys are gone and the kids want nothing to do with you :(

Thanks!  I am enjoying all I can, and as of right now my daughter is excited about cars and the garage.  I am hoping if I keep doing car stuff with her she will continue to like them.

Offline freeskier7791

Re: LT1 in an 85 GSL
« Reply #161 on: August 12, 2018, 08:18:36 AM »
In case you missed it, newest video is up showing how I design things. 

Offline freeskier7791

Re: LT1 in an 85 GSL
« Reply #162 on: September 14, 2018, 05:37:37 AM »
More drifting action!

« Last Edit: September 26, 2018, 12:46:45 PM by freeskier7791 »

Offline freeskier7791

Re: LT1 in an 85 GSL
« Reply #163 on: September 26, 2018, 12:43:35 PM »
Installing my drop brackets.  Let me know what you guys think



Offline freeskier7791

Re: LT1 in an 85 GSL
« Reply #164 on: October 14, 2018, 08:47:23 PM »
New battery time

https://youtu.be/qmi8pOEHcj8


Sent from my SM-G920V using Tapatalk