Quoted from manufactures on sway bars, one said

"Made from cold formed steel to better resist torsional fatigue and retain their "memory" far longer than conventional hot formed bars"

the other

"Our bar stock is 4140 chrome moly heat treated spring grade steel. The bars are entirely heat formed and coined as one piece. We put our bars through this extensive process to insure that the final product will be the strongest, most durable bar on the market, and that it will be the most resistant to form alteration. Most aftermarket anti-sway bars are cold-bent, making them weaker at the bends, and more vulnerable to shape alteration"

Also what the standard size of 32mm and 21????

 

i'm no expert but i believe i'd want cold formed parts

 

From what knowledge I have learned about spring rates and metals over the years- my educated guess is that springs that are heat treated will retain there shape and spring tension from that point on more consistently than cold formed springs.

However- take a cold formed spring with 1" solid diameter and a heat formed spring with 1" solid diameter. With all being the same other than bending process- the cold formed bar will be a higher rate but will loose tension a fair amount over time. So the heat formed spring, while loosing some initial spring rate from the heat process- will maintain that finished formed rate much more consistantly over time- it remains more predictable/constant.

My choice is the heat formed metal. As long as it is a matched rate front to rear after the forming process then you cant go wrong.

 

what is your input

 

I do AutoX occationally- use to hard core 10years ago- now just an occational for fun. This car is perfectly balance with Spohns setup. 34mm front (hot formed) and 25mm rear (hot formed). Car pulls 1.07g's on street rubber with full interior weight.

 

32mm = 1 1/4
21mm = 13/16
..or close to it..

I have Spohns set also...Nice - real nice.
1 5/16 front x 1 rear

Dang, if your getting 1.07g, than I can't imagine what mine is going to pull with 11" slicks & no interior weight what so ever.

Ron

 

I'm a lightweight V6 near perfect weight bais front to rear- Most don't realize that not only is the motor lighter, it is shorter thus overall sitting back more than the V8 also. This is why I built one.

 

I would go for the heat treated chromoly. Its strength is superior to regular steel, cold-formed or hot-formed. But if chromoly isn't heat treated its not much stronger than mild steel.