More 240z Suspension Questions

[Tom Donnelly]

Anybody know?

[joeg]

How much travel you need?

In a race car with adjustable coil-overs (and the weights we are dealing with)' it is unlikely you need a great deal of travel (free-length).

As to brands, when you are dealing with quality springs, the only difference is the powder coating color. You can use Hypercos, eibachs, Gc, carrera, etc. mix and match.

[Mike Mackaman]

Use the spring that gives you an unsprung weight you like. I personally like zero, but they don't make that spring in the rate I want so I run the shortest that will work.

Mike

[Tom Donnelly]

Use the spring that gives you an unsprung weight you like. I personally like zero, but they don't make that spring in the rate I want so I run the shortest that will work.

Mike

Bingo! That's what I was thinking but I guess I wasn't saying it right. Although, is a spring unsprung weight? But lighter is better, correct?

[joeg]

I said the same thing, Tom.

"Free length" is the length of the spring--shorter is lighter; it's just a matter of mass.

[Tom Donnelly]

I said the same thing, Tom.

"Free length" is the length of the spring--shorter is lighter; it's just a matter of mass.

Ok, cool. I didn't catch that. Sometimes you just gotta spell it out for me.

Thanks to all three of you.

Oh, and Robinson Racing has a spring tester. So I guess I'll be heading up there soon.

[pballance]

Ok Tom, I checked my notes and you should shoot for shock travel, for Bilstein, 2 3/4" - 3" bump and 2 1/2"-2 3/4" rebound. So roughly 5 1/2" total travel.

I did assemble my suspension and check travel and wound up getting 10" springs. That sounds long but I now have plenty of adjustment and when I re did the coilovers I changed the upper hat and put in camber plates. Needed the longer springs to make it work out right.

Of course, if we are at the point of weighing springs for their "unsprung" weight then I assume we have a 10/10ths build and that the driver will notice the difference.

In my car, I know that isn't the case. The driver is doing good to show up.