krazykorean35

just had some tubular weld in SFCs installed and now at higher speeds 80mph+ there is a lot more vibration throughout the whole car. i can watch the passenger side seat shake from the vibration ...is this normal or should i do something to adjust this? any info would be great!!

Injuneer

When they welded up the SFC's, was the car on a perfectly level surface, with all four wheels fully loaded with their normal weight?

krazykorean35

yeh...4 post drive on lift..

gearhead3

Hey, Where are you in the Bay Area?

GreenDemon

It's possible that the SFCs are allowing more vibration inside the car. You might want to check balance/condition of your tires & rims or see if anything else might be causing it. As an example, before I got new tires and SFCs the seat would shake. New tires took care of the problem, and the BMR boxed SFCs don't cause any extra vibration at all (firmer, but I actually like how that feels compared to chassis/body flex).

krazykorean35

marin country...that makes sense. alignment is prob off from hittin donuts.

Z95m6

Probably didn't tighten your LCA's up enough.