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#2382420 - 10/05/17 12:27 PM Subframe connectors?
70Drop Offline
member

Registered: 01/28/05
Posts: 161
Loc: California
My Duster has no subframe connectors, just a 6-point 0.134 mild steel roll bar. I've made about 30 passes with the car, and it launches straight and hard. Mid 10's with 1.5 60-foot. No complaints. I was originally going to put connectors in the car, but my friend said not to bother. He's been right about everything else he's suggested. He's a Chevy guy but has been building record-setting cars for many years. Interested in what you guys think.

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#2382430 - 10/05/17 12:44 PM Re: Subframe connectors? [Re: 70Drop]
topside Offline
I Live Here

Registered: 01/19/03
Posts: 11534
Loc: So Near, Yet So Far
They've helped with twist & distortion in everything I've put them on: a '73 Nova, '73 Camaro (both being stub-frame fronts & unitized rear bodies), 2 Dusters, '64 Plymouth wagon...one of the Dusters has made several hundred passes on slicks since new, low-10s, has been on the rear bumper, and the doors still close like a new car; subframe ties & 6-point cage. Both Chevys instantly handled more predictably and all instantly felt more solid.

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#2382437 - 10/05/17 12:48 PM Re: Subframe connectors? [Re: topside]
GY3 Offline


Registered: 12/13/13
Posts: 2105
Loc: Wichita
I did subframe connectors first just 2x2 so I didn't have to cut the floor. It made a HUGE difference in the feel of the car. I recently added a 6pt. bar and was suprised it felt even better!

Anything you can do to stiffen our unibodies helps!
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#2382453 - 10/05/17 12:59 PM Re: Subframe connectors? [Re: 70Drop]
CMcAllister Offline
top fuel

Registered: 12/30/05
Posts: 1840
Loc: Fulton County, PA
A bodies are flimsy. Sub frame connectors are the first thing to do. Welded, and I prefer to section into or at least tie them into the floor somehow. Firewalls are also flimsy, that is usually addressed with a full cage.

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#2382506 - 10/05/17 02:15 PM Re: Subframe connectors? [Re: 70Drop]
B3422W5 Offline
master

Registered: 01/20/03
Posts: 9926
Loc: Portage,michigan
They make a HUGE difference.
Make sure to install the two angled bars off the main hoop through the rear sear footwell to connect with the frame connectors, basically that makes a 6 point an 8 point and is an extremely good upgrade.
Doing all this makes the car " one piece" your doors will thank you by continuing to shut properly


Edited by B3422W5 (10/05/17 02:15 PM)
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#2382539 - 10/05/17 03:16 PM Re: Subframe connectors? [Re: 70Drop]
polyspheric Offline
top fuel

Registered: 10/10/07
Posts: 2288
Loc: New York
3" tall, through the floor.
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#2382597 - 10/05/17 05:00 PM Re: Subframe connectors? [Re: polyspheric]
CMcAllister Offline
top fuel

Registered: 12/30/05
Posts: 1840
Loc: Fulton County, PA
Originally Posted By polyspheric
3" tall, through the floor.


Short of a 25.x chassis, this is most effective.

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#2382716 - 10/05/17 08:35 PM Re: Subframe connectors? [Re: 70Drop]
polyspheric Offline
top fuel

Registered: 10/10/07
Posts: 2288
Loc: New York
IIRC 3" still keeps the floor mostly intact.
For those not familiar, the bending resistance improvement between 2" and 3" is huge: more than 2-1/2 times with only a 25% weight penalty.
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#2382726 - 10/05/17 08:49 PM Re: Subframe connectors? [Re: 70Drop]
A/MP Offline
mopar

Registered: 10/09/08
Posts: 517
Loc: East Coast
If your Duster ws a few years old than I would agree with your friend.45+ years and there is rust and plenty of torsional stress from just being a car driving on the road or just sitting in a garage. Takes a lot of torque to move an A body into the tens. Once you twist the frame your done. That car won't be worth sh%*. Do yourself the favor and have them installed.

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#2382770 - 10/05/17 09:59 PM Re: Subframe connectors? [Re: 70Drop]
polyspheric Offline
top fuel

Registered: 10/10/07
Posts: 2288
Loc: New York
... before you wrinkle the "C" pillar on a hard launch!
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#2382884 - 10/06/17 09:09 AM Re: Subframe connectors? [Re: CMcAllister]
6PKRTSE Offline
master

Registered: 01/29/04
Posts: 2940
Loc: Motor City
Originally Posted By CMcAllister
Originally Posted By polyspheric
3" tall, through the floor.


Short of a 25.x chassis, this is most effective.


Yes, Mine are round tube chrome moly & tie in with the cage on my Challenger and go thru the torsion bar support & front frame rails. The short bar show with tab is my removable drivesahft loop mount that goes from frame connector to frame connector & meets the 25.5 rule about having the under car cross bar.


Attachments
100_1707.JPG


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1970 CHALLENGER R/T, 25.5 Cert, Big Inch Alum 16 plug HEMI twin turbo.
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1970 Plymouth Road Runner.
1996 2500 RAM 488 V-10 4X4.
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#2382897 - 10/06/17 09:41 AM Re: Subframe connectors? [Re: 70Drop]
383man Offline
Too Many Posts

Registered: 01/19/03
Posts: 26493
Loc: Balt. Md
I would put them in. No matter how much they will help some. Even if they did not help they surely wont hurt any and can only help some. I feel my 6 point rollbar stiffened my car more then the frame connectors but the frame connectors definetly helped. Ron
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#2382954 - 10/06/17 11:55 AM Re: Subframe connectors? [Re: polyspheric]
70Drop Offline
member

Registered: 01/28/05
Posts: 161
Loc: California
A unanimous opinion. I guess I have some welding to do. Thanks to all for your input.

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#2383157 - 10/06/17 07:58 PM Re: Subframe connectors? [Re: 70Drop]
polyspheric Offline
top fuel

Registered: 10/10/07
Posts: 2288
Loc: New York
If you're not sure the boxes are water-tight, drill small drain holes at the lowest points so that water doesn't accumulate.
Someone I know has simply caulked the ends with silicone (very clean first!) and it's been dry for years.
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