TheJeanyus
03-01-2005, 03:44 PM
...this is what the guy said about rear coilovers:
I do not know where you heard that "using rear coil overs with IRS can result in less traction", this is absolutely false, in fact it is quite the opposite. I am assuming that the person who said this was running too stiff of a spring for his combination, resulting in reduced compliance of the rear tires. When correct spring rates are used with coil-overs there is nothing on the market that can match their performance or excellent ride quality.
It is ideal to run coil-overs front and rear, this will produce the best results and most balanced ride. Coil-overs can be used in the front only, however you must use an extremely stiff stock location spring out back or a very soft coil-over spring up front to keep the car feeling neutral.
And some other advice he had:
If wheel hop is an issue for you the Delrin Control Arm Bushings are what you need. Wheel hop is caused by the original soft rubber bushings, urethane will reduce this deflection but not eliminate it. Delrin Control Arm Bushings will offer the largest reduction of wheel hop for your money. Some people are intimidated by them because they think that they will bring NVH (noise, vibration, harshness) into the vehicle, this is false. In this particular location delrin is very acceptable, any NVH will still be isolated at the four subframe bushings. This means the delrin is no more intrusive than stock.
If you are experiencing a driveline vibration, like most IRS equipped Cobra owners, at higher freeway speeds the 3-Piece Aluminum Differential Mounts are for you! These bushings will offer pinion angle adjustment to eliminate that annoying driveline vibration. Due to the fact that they also solidly mount the differential means that you will never experience any differential housing/cover failures (common with other 2-piece kits on the market). These will transmit a bit of gear whine into the interior, mainly in reverse and when cruzing on the highway with the windows up. It is not nearly as intrusive as the supercharger whine.
He never did recommend a spring rate, but it sounds like front/rear coil over conversions with soft springs are the way to go?
I do not know where you heard that "using rear coil overs with IRS can result in less traction", this is absolutely false, in fact it is quite the opposite. I am assuming that the person who said this was running too stiff of a spring for his combination, resulting in reduced compliance of the rear tires. When correct spring rates are used with coil-overs there is nothing on the market that can match their performance or excellent ride quality.
It is ideal to run coil-overs front and rear, this will produce the best results and most balanced ride. Coil-overs can be used in the front only, however you must use an extremely stiff stock location spring out back or a very soft coil-over spring up front to keep the car feeling neutral.
And some other advice he had:
If wheel hop is an issue for you the Delrin Control Arm Bushings are what you need. Wheel hop is caused by the original soft rubber bushings, urethane will reduce this deflection but not eliminate it. Delrin Control Arm Bushings will offer the largest reduction of wheel hop for your money. Some people are intimidated by them because they think that they will bring NVH (noise, vibration, harshness) into the vehicle, this is false. In this particular location delrin is very acceptable, any NVH will still be isolated at the four subframe bushings. This means the delrin is no more intrusive than stock.
If you are experiencing a driveline vibration, like most IRS equipped Cobra owners, at higher freeway speeds the 3-Piece Aluminum Differential Mounts are for you! These bushings will offer pinion angle adjustment to eliminate that annoying driveline vibration. Due to the fact that they also solidly mount the differential means that you will never experience any differential housing/cover failures (common with other 2-piece kits on the market). These will transmit a bit of gear whine into the interior, mainly in reverse and when cruzing on the highway with the windows up. It is not nearly as intrusive as the supercharger whine.
He never did recommend a spring rate, but it sounds like front/rear coil over conversions with soft springs are the way to go?