moby van - '03 Dodge Caravan SE 90 day: 19.74 mpg (US)
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I would guess that the race cars your friend torched the springs on don't put many miles on. I had a Malibu that I cut the springs on then heated them slightly to re-flatten the end coils. After about two years in the car one of the springs broke just about where I had heated it. The break was near the end so it was no big problem driving the car but if you heat the middle of your spring and it breaks there you will really have a problem.
I cut my springs and flattened the end coils so they would seat properly in the saddle. I used the absolute bare minimum of heat to do that. I squished that last coil in a vise then heated until I thought I sensed that the tension was relaxed a bit. It appears my sense of that was right, as I did it- oh, has it been 6 or 7 years ago already?- with no sagging or breakage problems whatsoever.
moon,I think you will live to regret torching the springs.It would take you many tens of thousands of dollars in a major wind tunnel just to learn what to do,if anything.Just to go into it blind could cost you big-time.And you have no fore knowledge of a positive outcome.
If you'll wait a while,I or another will post the work on the Daytona Charger.A fraction of a degree can significantly alter drag for the worse.
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