Coil over springs or just springs
03-24-2003, 09:00 AM
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Coil over springs or just springs
I am looking to lower my 1991 C4 and put some cross drilled rotors on my 964. I am doing this mostly for looks and do not plan to race the car. For reference I have updated the Porsche with all OEM RS America body parts (17" cup wheels, mirror, and rear whale tall). My question is the local Porsche shop wants 2,100 to put H&R springs on it (they buy the springs) and put my supplied drilled rotors and new pads and do all the needed adjustments. I am pretty handy on doing most jobs my self and not in a hurry, but a little nevous to do springs myself. Are coil over springs less work to put on myself? Should I just get coil overs and do the job my self? Thanks Alan
03-24-2003, 01:56 PM
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Alan,
Go to <a href="http://www.porsche964.co.uk" target="_blank">www.porsche964.co.uk</a> and look in the technical section where you'll find several suspension articles that talk to several upgrades, most which include the springs. As long as you have a spring compressor, and observe good safety practices working with compressed springs, you can do that yourself. Wouldn't hurt to have one of the several publications available which cover the various torques when you put things back together. Pads and rotors are a snap to do, I was just doing that this weekend, as a matter of fact. When you're done, you will need the shop to do an alignment, and I'd recommend a corner balance too.
As with any work, unless you're knowledgable and comfortable working with the suspension and especially the brakes, then consider having a shop do the work.
Go to <a href="http://www.porsche964.co.uk" target="_blank">www.porsche964.co.uk</a> and look in the technical section where you'll find several suspension articles that talk to several upgrades, most which include the springs. As long as you have a spring compressor, and observe good safety practices working with compressed springs, you can do that yourself. Wouldn't hurt to have one of the several publications available which cover the various torques when you put things back together. Pads and rotors are a snap to do, I was just doing that this weekend, as a matter of fact. When you're done, you will need the shop to do an alignment, and I'd recommend a corner balance too.
As with any work, unless you're knowledgable and comfortable working with the suspension and especially the brakes, then consider having a shop do the work.
03-25-2003, 07:41 AM
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Hi Alan,
If you are going to do this at home, there are a few things to consider.
Firstly with the 91 model year there are two versions of the rear suspension, the later version having shorter springs (mounts were lowered in order to make more room for the cabriolet model), so you need to identify what springs you need to order.
Secondly, replacing the springs on the front requires the brake line to be disconnected and you may need to bleed the brakes. The C4 uses a high pressure hydraulic system that needs a Bosch hammer to be connected in order to correctly bleed the brakes (in order to open various valves in the system), without it you could result in
brake failure, so be careful.
Also, I would suggest replacing both the springs and shocks at the same time, using your original shocks with lowered springs can result in shock failure soon after fitting. You really should match the shocks to the springs and there has been lots written about this.
Good luck
Ade
If you are going to do this at home, there are a few things to consider.
Firstly with the 91 model year there are two versions of the rear suspension, the later version having shorter springs (mounts were lowered in order to make more room for the cabriolet model), so you need to identify what springs you need to order.
Secondly, replacing the springs on the front requires the brake line to be disconnected and you may need to bleed the brakes. The C4 uses a high pressure hydraulic system that needs a Bosch hammer to be connected in order to correctly bleed the brakes (in order to open various valves in the system), without it you could result in
brake failure, so be careful.
Also, I would suggest replacing both the springs and shocks at the same time, using your original shocks with lowered springs can result in shock failure soon after fitting. You really should match the shocks to the springs and there has been lots written about this.
Good luck
Ade
03-25-2003, 02:47 PM
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Dear Alan,
If you are doing this just for looks I would recommend you contact RUF. They have a lowering kit which would meet your requirements. This kit uses your existing springs, struts and shocks.
Part number is R65 30 341 00
info@ruf-automobile.de
I do not know the US address or dealers I am afraid.
Ciao,
Adrian
911C4
If you are doing this just for looks I would recommend you contact RUF. They have a lowering kit which would meet your requirements. This kit uses your existing springs, struts and shocks.
Part number is R65 30 341 00
info@ruf-automobile.de
I do not know the US address or dealers I am afraid.
Ciao,
Adrian
911C4