I picked up a set of SLP sub frame connectors yesterday and installed them last night and WOW!, the t-tops don't squeek any more and the car feels better all around on the street. They made a huge differance! I payed a little more than I wnated to but still am happy with them. They are the SLP bolt in's and after bolting them in I welded them in! They fit perfect too! I just wish I would have done this when I bought the car!

Brian

 

Sounds good. I cant wait to get my BMRs in. They have been sitting around my hosue for almost 2 years now.

 

Wow, get those bad boys in! It's a world of a difference with them on. You can easily tell a car that has subframes and one that does not.

 

My dad laughed at me when i told him there was a difference in the car after i put mine in. I really love how tight the car is now. I guess the old man wouldn't know in his day all the cars had full frames.

 

Thats cool. Do they really make that much of a differnece? I was thinking about doing them but didnt know if they were worth the money.


Chris

 

HUGE difference.

 

I was amazed at the differance!! I pulled the car out of the driveway and the tops used to always squeek and creek they dont make a peep any more.Going over bumps they are quiet also(and it is cold here so that makes the bumps even worse). The car is all in all quieter than before. I at the same time went around and tightened some of the fastners in the doors but I am convinced that the subframe connectors solved most of the rattles. If you don't have them I would reccomend them as a good investment...

Brian

 

This was the first mod I have done to my car. All the noises were gone and the car felt very solid. I never new how much flex there was in the chassis until I put these in. I used Slot Car Racing weld-in SFC's for $80. I was convinced in getting them when my friends mustangs door would bounce back at you after u tried to close the door.

 

hey Kluck, i've been looking at the SLP SFC's also. How was the install? did you loose any ground clearance, Are they real noticeable under the car? Thanks man.

 

From start to finish they took me an hour, that is with jacking up the car(I hate that!) bolting them in and welding the ends front and back. They fit great, finish is also excelent. They hang down below the rocker about another 3/4 inch and you can barely see them unless you look under the car..

 

Even though they did they were much less stiff than modern cars. They didn't rattle because they were so flabby that they none of the impacts from the road ever reached the interior parts. Rattles actually increase to a point as a vehicle goes up in stiffness they then go down after a certian point. The reason for this is that the body of the vehicle and the interior parts have resonant frequencies that are very close together. When you make the body stiffer by adding subframe connectors, the interior parts rattle less because their resonant frequencies are now much lower than the resonant frequency of the vehicle body.

 

I would have to disagree that the cars aren't stiff, they handle tremendous beatings in demo derbys and keep coming. The bodys are stiff the suspensions are horrible. I don't think a older car is weaker they weren't built to crush like new cars in accidents to prevent injury.

 

I have a set of Kenny Brown DD and im still deciding what to do with them...

The add a lot of weight to a car i hardly drive, but i know they'll help me car out so i think i might just have to go ahead and install them puppies

 

SFCs for $80???? Tell me more!!!!

 

"Stiff" and "strong" are two totally different things. Older cars are quite strong but very flexible. The resonant frequency of the body and chassis is measured in cycles per second or "Hz".
The average car from the late 1960's or early 1970's is about 6-8Hz, convertibles are as low as 1Hz. A modern unit bodied car like the last Camaro and Firebird hardtop or t-top models are about 15-18Hz. A really good unit-bodied car like a Oldsmobile Aurora or Cadillac Seville is about 24Hz. When the American car companies started looking at what made German and Japanese luxury cars more desireable, one of the things customer's mentioned was a "feeling of quality". This "feeling" came from the vehicle structure stiffness. When GM and Ford were building 10Hz luxury cars in the 1980's Mercedes and BMW were building 22-25Hz structures that had a feeling of rock-solid quality.