Coilovers
05-17-2010, 10:31 AM
#1
Coilovers
Has anyone switched or upgraded their coil over set up?
Specifically going from the good entry level stuff to the more expensive Moton or Penske set ups.
Asking because I have a set now and find insufficient shock travel even though the the car is only lowered 1/2 inch. I regularly hit the bump stops. Car is a C6 Z used mostly for HPDE on Hoosiers.
Thx
Specifically going from the good entry level stuff to the more expensive Moton or Penske set ups.
Asking because I have a set now and find insufficient shock travel even though the the car is only lowered 1/2 inch. I regularly hit the bump stops. Car is a C6 Z used mostly for HPDE on Hoosiers.
Thx
05-18-2010, 12:24 AM
#4
05-18-2010, 07:43 AM
#5
I have a Bilstein coil setup which are non adjustable. I am thinking a stiffer spring but need to find out what they were built with.
Concern is there really is what I think is very little shock travel. Looks like at most four inches, not sure what this translates to at the wheel. The car is lowered 1/2 inch and runs out of travel, stiffer springs could mean less traction, do other manufacturers have shorter main bodies?
Thx
Concern is there really is what I think is very little shock travel. Looks like at most four inches, not sure what this translates to at the wheel. The car is lowered 1/2 inch and runs out of travel, stiffer springs could mean less traction, do other manufacturers have shorter main bodies?
Thx
05-18-2010, 11:54 AM
#6
Safety Car
Concern is there really is what I think is very little shock travel. Looks like at most four inches, not sure what this translates to at the wheel. The car is lowered 1/2 inch and runs out of travel, stiffer springs could mean less traction, do other manufacturers have shorter main bodies?
Stock C6 Z51 shocks:
- Front shock is 17" from frame mount to T-bar. 11 3/8" body, 5 1/4" stroke, 30mm (1 1/5") bump rubber
- Rear shock is 17.75" from frame mount to lower clevis eyes. 11 1/4" Body, 5" stroke, 30mm (1 1/5") bump rubber
My DRM Bilstein coilovers are shorter, with less stroke (but no bump rubber)... but the spring rate is much higher than stock (although less than some other coilovers on the market). I haven't noticed any bottoming out. I'm about 4 3/8" to the front jacking puck holes, and a little higher in the rear... which is a little more than a 1/2" drop from stock.
The only non-adjustable Bilsteins I know of are DRM and LGM and I believe both use Hyperco springs so the rates should be scratched in to the ends of the springs.
As a complete rumor: I've heard LGM has two versions of their Bilstein coilovers, one that is much shorter than the other, but I've never confirmed it.
Motion ratios are ~0.65 front and ~0.6 (average) in the rear. So 4" of stock travel is very roughly 6" of wheel travel in the front, and 6.5" in the rear.
05-18-2010, 12:02 PM
#7
Safety Car
One more thing to note. A shorter/longer body may not help if you can't also change the piston rod length... the piston & rod have to go somewhere when it enters the shock body. And don't forget there's some volume taken up by the shock oil and gas...
05-18-2010, 03:06 PM
#8
How are you checking travel, by the way?
Stock C6 Z51 shocks:
My DRM Bilstein coilovers are shorter, with less stroke (but no bump rubber)... but the spring rate is much higher than stock (although less than some other coilovers on the market). I haven't noticed any bottoming out. I'm about 4 3/8" to the front jacking puck holes, and a little higher in the rear... which is a little more than a 1/2" drop from stock.
The only non-adjustable Bilsteins I know of are DRM and LGM and I believe both use Hyperco springs so the rates should be scratched in to the ends of the springs.
As a complete rumor: I've heard LGM has two versions of their Bilstein coilovers, one that is much shorter than the other, but I've never confirmed it.
Motion ratios are ~0.65 front and ~0.6 (average) in the rear. So 4" of stock travel is very roughly 6" of wheel travel in the front, and 6.5" in the rear.
Stock C6 Z51 shocks:
- Front shock is 17" from frame mount to T-bar. 11 3/8" body, 5 1/4" stroke, 30mm (1 1/5") bump rubber
- Rear shock is 17.75" from frame mount to lower clevis eyes. 11 1/4" Body, 5" stroke, 30mm (1 1/5") bump rubber
My DRM Bilstein coilovers are shorter, with less stroke (but no bump rubber)... but the spring rate is much higher than stock (although less than some other coilovers on the market). I haven't noticed any bottoming out. I'm about 4 3/8" to the front jacking puck holes, and a little higher in the rear... which is a little more than a 1/2" drop from stock.
The only non-adjustable Bilsteins I know of are DRM and LGM and I believe both use Hyperco springs so the rates should be scratched in to the ends of the springs.
As a complete rumor: I've heard LGM has two versions of their Bilstein coilovers, one that is much shorter than the other, but I've never confirmed it.
Motion ratios are ~0.65 front and ~0.6 (average) in the rear. So 4" of stock travel is very roughly 6" of wheel travel in the front, and 6.5" in the rear.
Question now is what to upgrade to?
05-18-2010, 04:21 PM
#10
I measured travel with an O-ring on the shaft which ended up pounded into the bottom bump stop
I'd like to hear how satisfied anyone is with their Penske or Moton units?
What's good or could be better?
