Suggested tire pressure with x74 Suspension?
01-05-2013, 06:48 AM
#17
Instructor
Somehow the concept of installing the X74 kit, then running tire pressures well below factory spec because "it's too harsh" does not compute. If you want a plush ride, buy an old Cadillac land yacht and retrofit an air suspension kit. 
But seriously...start with the same pressures post-X74 that you ran pre-X74. Pay careful attention to tire wear, both to ensure the alignment you had done after installing the X74 kit is working, and to watch for any premature/unusual tire wear due to inflation pressures. Adjust up or down from your pre-X74 numbers as you deem appropriate.
FWIW, I run factory 36/44 in my '02 Cab with the R030 RoW suspension package, on Houston's roads which are not at all brilliant. While this set up does not have the same cushy ride as my wife's SUV, I'm happy to trade that for razor-sharp handling which is part of why I chose my Porsche in the first place.
But seriously...start with the same pressures post-X74 that you ran pre-X74. Pay careful attention to tire wear, both to ensure the alignment you had done after installing the X74 kit is working, and to watch for any premature/unusual tire wear due to inflation pressures. Adjust up or down from your pre-X74 numbers as you deem appropriate.
FWIW, I run factory 36/44 in my '02 Cab with the R030 RoW suspension package, on Houston's roads which are not at all brilliant. While this set up does not have the same cushy ride as my wife's SUV, I'm happy to trade that for razor-sharp handling which is part of why I chose my Porsche in the first place.
01-05-2013, 01:42 PM
#19
Somehow the concept of installing the X74 kit, then running tire pressures well below factory spec because "it's too harsh" does not compute. If you want a plush ride, buy an old Cadillac land yacht and retrofit an air suspension kit.
But seriously...start with the same pressures post-X74 that you ran pre-X74. Pay careful attention to tire wear, both to ensure the alignment you had done after installing the X74 kit is working, and to watch for any premature/unusual tire wear due to inflation pressures. Adjust up or down from your pre-X74 numbers as you deem appropriate.
FWIW, I run factory 36/44 in my '02 Cab with the R030 RoW suspension package, on Houston's roads which are not at all brilliant. While this set up does not have the same cushy ride as my wife's SUV, I'm happy to trade that for razor-sharp handling which is part of why I chose my Porsche in the first place.
But seriously...start with the same pressures post-X74 that you ran pre-X74. Pay careful attention to tire wear, both to ensure the alignment you had done after installing the X74 kit is working, and to watch for any premature/unusual tire wear due to inflation pressures. Adjust up or down from your pre-X74 numbers as you deem appropriate.
FWIW, I run factory 36/44 in my '02 Cab with the R030 RoW suspension package, on Houston's roads which are not at all brilliant. While this set up does not have the same cushy ride as my wife's SUV, I'm happy to trade that for razor-sharp handling which is part of why I chose my Porsche in the first place.
It's not about cushy ride for everyone but rather trying to find the best grip and balance possible for your setup and driving style. The settings Porsche recommends is a trade off for the streets and a typical driver in a stock car. Once you change things, even like different brand of tires, those settings although a good baseline gets thrown out the window.
