proper procedure for installing inner subframe connectors?
#1
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proper procedure for installing inner subframe connectors?
i used the search function and didn't find what i was looking for. my car like many has gotten floppy over the years. i have outer connectors and they did help out but i want to add inners for the stiffest "frame" i can get. i thought i would need to have a body shop put it on a frame table to make sure it was level and then weld the connectors in. i contacted one and they said that isnt needed to install subframe connectors. i know i need a good level surface. whats the agreed upon method to make sure this junk is sitting flat?
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Re: proper procedure for installing inner subframe connectors?
You want to weld them on as the car sits on its own weight. If you try and "square and or level" you will put the car in a position that it won't naturally be once on its wheels, which will put all kinds of stresses on the car and subframe welds.
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Roorancher (10-15-2022)
#3
Re: proper procedure for installing inner subframe connectors?
Just install on a 4 post lift.
you can rent they out for fairly cheap in most areas.
https://m.youtube.com/watch?v=avr6HdKlU30
you can rent they out for fairly cheap in most areas.
https://m.youtube.com/watch?v=avr6HdKlU30
#4
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Re: proper procedure for installing inner subframe connectors?
[QUOTE=Evilokc;6481425]... i have outer connectors and they did help out /QUOTE]
While the replies above will do the job (I had my outers done with the vehicle sitting on the suspension as on a four post lift), I'm more interested in how your outer SFC didn't help. The Spohns I installed a dozen years ago have provided plenty of chassis stiffness. So much so that jacking up the car at any one corner (at the jacking points) will raise the entire side.
While the replies above will do the job (I had my outers done with the vehicle sitting on the suspension as on a four post lift), I'm more interested in how your outer SFC didn't help. The Spohns I installed a dozen years ago have provided plenty of chassis stiffness. So much so that jacking up the car at any one corner (at the jacking points) will raise the entire side.
#5
Re: proper procedure for installing inner subframe connectors?
Outer SFC are typically less effective than inner SFC due to the length.(for the most part)
what's stronger?
A 50in tube being twisted? Or a 36in tube being twisted?
That's why welding the pinch welds to the SFC makes a insane difference in rigidity.
50in becomes basically 0 inches.
I removed 2 sets of SFC and went with DSE. The difference is measurable.
But this is all basically irrelevant for street driven 3rd gens. Just throw on a set of SFC and forget about it.
what's stronger?
A 50in tube being twisted? Or a 36in tube being twisted?
That's why welding the pinch welds to the SFC makes a insane difference in rigidity.
50in becomes basically 0 inches.
I removed 2 sets of SFC and went with DSE. The difference is measurable.
But this is all basically irrelevant for street driven 3rd gens. Just throw on a set of SFC and forget about it.
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Re: proper procedure for installing inner subframe connectors?
I have Spohn outers and alston inners installed at the same time right after I bought my car in '15. The thing is great for chassis stiffness and has No squeaks or rattles which AFAIK is rare for these cars. Mine was done on a drive on lift at the time.
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Re: proper procedure for installing inner subframe connectors?
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Re: proper procedure for installing inner subframe connectors?
I originally installed these (or any Sub-Frame Connectors) on a Drive-On (4 Post) Lift...
I realized early on that many (if Not most) of these Cars are not straight anymore.
I changed to using a Frame-Machine to do the installation after any needed Frame Correction...
I'll never go back to doing this any other way.
I realized early on that many (if Not most) of these Cars are not straight anymore.
I changed to using a Frame-Machine to do the installation after any needed Frame Correction...
I'll never go back to doing this any other way.
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skinny z (10-15-2022)
#9
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Re: proper procedure for installing inner subframe connectors?
My Spohns were done by my good friend at Altered Image. Chassis building specialist and all round excellent fabricator.
We used his level shop floor as a reference for relative flatness and preloaded/unloaded each corner via the lift and jack stands.
Otherwise this stuff gets done on frame jig but my heap was already a fully decked out street car so no jig for me.
We used his level shop floor as a reference for relative flatness and preloaded/unloaded each corner via the lift and jack stands.
Otherwise this stuff gets done on frame jig but my heap was already a fully decked out street car so no jig for me.
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Re: proper procedure for installing inner subframe connectors?
Should the car not be off its wheels so the chassis can be squared before permanently fixing it in place? Then suspension should be adjusted accordingly.
#11
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Re: proper procedure for installing inner subframe connectors?
i used the search function and didn't find what i was looking for. my car like many has gotten floppy over the years. i have outer connectors and they did help out but i want to add inners for the stiffest "frame" i can get. i thought i would need to have a body shop put it on a frame table to make sure it was level and then weld the connectors in. i contacted one and they said that isnt needed to install subframe connectors. i know i need a good level surface. whats the agreed upon method to make sure this junk is sitting flat?
#12
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Car: Resto-Mod 1987 IROC-Z Clone
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Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: proper procedure for installing inner subframe connectors?
...and for the love of god...
DO NOT USE BRICKS, CINDER-BLOCKS, OR ANYTHING BRITTLE enough to crumble and KILL YOU!
DO NOT USE BRICKS, CINDER-BLOCKS, OR ANYTHING BRITTLE enough to crumble and KILL YOU!
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Re: proper procedure for installing inner subframe connectors?
I originally installed these (or any Sub-Frame Connectors) on a Drive-On (4 Post) Lift...
I realized early on that many (if Not most) of these Cars are not straight anymore.
I changed to using a Frame-Machine to do the installation after any needed Frame Correction...
I'll never go back to doing this any other way.
I realized early on that many (if Not most) of these Cars are not straight anymore.
I changed to using a Frame-Machine to do the installation after any needed Frame Correction...
I'll never go back to doing this any other way.
#15
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Car: Resto-Mod 1987 IROC-Z Clone
Engine: Alky fed L92 Vortec Twin-Turbo 6.8L
Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: proper procedure for installing inner subframe connectors?
I have yet to travel to a big City where Body Shops are NOT pulling Frames during Collision Repair...
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Re: proper procedure for installing inner subframe connectors?
Keep looking...hopefully you'll find a local shop that will take this job on.
#17
Supreme Member
Re: proper procedure for installing inner subframe connectors?
Frame shops notwithstanding, if your unibody is bent like a trapezoid from a collision, it may be that subframe connectors are the least of your concerns.
However, with a nice level floor, and a chassis that isn't mangled, you should be able to determine the measurements in the bottom graphic of the image posted below.
Once you've established that the chassis is "level" to the ground, the SFC's can follow with whatever means you have to get the car sufficiently high enough to work on.
However, with a nice level floor, and a chassis that isn't mangled, you should be able to determine the measurements in the bottom graphic of the image posted below.
Once you've established that the chassis is "level" to the ground, the SFC's can follow with whatever means you have to get the car sufficiently high enough to work on.
#18
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Re: proper procedure for installing inner subframe connectors?
Additional data for referring to the picture above.
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TylerSteez (10-22-2022)
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