Is there any difference between the 99s IRS and the 03-04 when it comes to choosing lowering springs. What springs are you guys running? And is anyone running wheel spacers on the back with the stock wheels. If so are you running 1 or 1 1/2 inch spacers?
99 cobra irs questions
- Thread starter kepple022
- Start date
As I recall the factory lists a different spring for the 03-04 but most aftermarket suppliers do not, I'm running Steeda Sportlines on mine, if you do run a spacer I would suggest Eibachs since they seem to be the most robust, I've autocrossed on them w/o issues.
Wheel Spacers | eibach.com/america
Wheel Spacers | eibach.com/america
I have maximum Motorsports coil over 575lbs springs in the rear very nice ride and not a lot of wheels hop. My gt wheel hopped more then the IRS with a solid axle go coil over in the rear at least you will thank yourself
http://www.svtperformance.com/forums/suspension-modifications-211/365383-spring-rate.html
IRS spring summary by Jefe/JRGoffin/Starnsey
IRS Spring Rates:
• 1999/2001 Cobra F: 500 R: 470
• 2000 Cobra R F: 800 R: 750
• 2003/2004 Coupe F: 600 R: 600
• 2003/2004 Vert F: 500 R: 470
• Steeda Cobra F: 720-780 R: 650-790
• H&R Race F: 760-850 R: 770
• H&R Sport F: 700-760 R: 685
• Eibach Pro-Kit F: 450-570 R: 650-820
• Kenny Brown F: 725 R: 825
• Vogtland F:400-742 R: 274-713
Double check in thread above
If you lower the 99-01, you will need aftermarket rear shocks.
The oem shocks are phyically not able to hold up to lowering springs; they will be crushed.
H&R Race in the stock OEM locations (non-CO) seem to be a favorite. 800#/770#
Again you will need bilstein B6, B8 or koni sports shocks...or something
The Vogtland springs are picking up a following too..
Then there is this:
http://www.svtperformance.com/forums/how-230/626015-complete-how-cut-your-stock-springs-thread.html
IRS spring summary by Jefe/JRGoffin/Starnsey
IRS Spring Rates:
• 1999/2001 Cobra F: 500 R: 470
• 2000 Cobra R F: 800 R: 750
• 2003/2004 Coupe F: 600 R: 600
• 2003/2004 Vert F: 500 R: 470
• Steeda Cobra F: 720-780 R: 650-790
• H&R Race F: 760-850 R: 770
• H&R Sport F: 700-760 R: 685
• Eibach Pro-Kit F: 450-570 R: 650-820
• Kenny Brown F: 725 R: 825
• Vogtland F:400-742 R: 274-713
Double check in thread above
If you lower the 99-01, you will need aftermarket rear shocks.
The oem shocks are phyically not able to hold up to lowering springs; they will be crushed.
H&R Race in the stock OEM locations (non-CO) seem to be a favorite. 800#/770#
Again you will need bilstein B6, B8 or koni sports shocks...or something
The Vogtland springs are picking up a following too..
Then there is this:
http://www.svtperformance.com/forums/how-230/626015-complete-how-cut-your-stock-springs-thread.html
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I am guessing that cutting the springs is not an option for those with over 100k miles, right?
I did the cut spring route but i went pretty low. I was not happy with ride quality after a few months. I decided to go with Steeda springs and kept my Tokico HP dampers. I am obviously higher but now I am not hearing scraping from my mufflers. And of course ride and handling are much improved. By the way the Steeda springs are specific to 99-01 cars.
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