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Suspension improvements should be among the first items on your agenda for upgrading your 911. Besides Driver Training, these are the most important and cost effective changes to your Porsche that will make your car faster and more controllable.

             greg1.JPG (40960 bytes)  An autocrossing 911 in need of suspension work

 

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Here is a street-driven 911 with a properly prepared suspension on slicks exiting (old) Turn nine at Portland International Raceway

Rennsport Systems offers many choices when upgrading your suspension components for racing, autocrossing, or everyday driving. We can help you choose the proper components that will transform your 911/930's handling and make the car a lot more fun and much easier to drive.

Changing Shock Absorbers, Swaybars, Torsion Bars or Springs, Chassis Stiffeners, replacing rubber bushings with Poly-Bronze® are all components that can be improved individually or as a complete system. Many upgrades will have a negligible effect on ride quality.

Tires and wheels play the largest role in how your car handles. Fact is, tires are the single most important performance component on your car. The traction that they provide allows the springs, shocks, and swaybars to help generate higher cornering forces and the ability for the braking system to slow the car down.

Some of the adjustments listed below can affect the car's handling and cornering capabilities; others will affect the transitions from acceleration-to-braking and corner entry and exit. Aerodynamics play a larger role at higher speeds.

When fine tuning your Porsche, make One Change at a Time. This will allow you to evaluate these effects and will enhance your understanding of how your car handles.

Here are some well proven suspension packages for varying year 911's:

Year Shocks T-bars/Springs Swaybars
Street '66-'68 Bilstein HD 21mm/26mm 20mm F&R
Street/Track '66-'68 Bilstein HD/Sport 22mm/27mm 20mm F&R
Street '69-'73 Bilstein HD 21mm/26mm 20mm F&R
Street/Track   '69-'73 Bilstein HD/Sport 22mm/27mm or 22mm/28mm 20mm F&R
Track '69-'73 Bilstein Sport or RSR 22mm/28mm or 22mm/29mm 20mm or 23mm F&R
Street '74-'77 Bilstein HD 21mm/26mm 20mm F&R
Street/Track '74-'77 Bilstein HD/Sport 22mm/27mm 20mm or 23mm F&R
Track '74-'77 Bilstein HD/Sport 22mm/27mm 20mm or 23mm F&R
Street '78-'89 Bilstein HD 22mm/28mm 20mm or 23mm F&R
Street/Track '78-'89 Bilstein HD/Sport 22mm/28mm or 22mm/29mm 23mm F&R
930 Street Bilstein HD/Sport 22mm/29mm 23mm F&R
930 Track Bilstein RSR 22mm/31mm or  22//33mm 23mm/25mm
964 C2/C4 Bilstein HD H&R Sport RS adjustable 23mm/18mm
964 RSA Bilstein HD H&R Sport RS adjustable 23mm/18mm
964 Track Moton Clubsport Custom main/tender package RS adjustable 23mm/20mm
993 & TT Street Bilstein HD H&R Sport RS adjustable 23mm/20mm
993 & TT Street/Track PSS-9 PSS-9

      RS        adjustable    23mm/20mm

993 & TT Track Moton Clubsport Custom main/tender package RSR adjustable 23mm/22mm
996 Bilstein HD H&R Sport GT-3
996 TT Street/Track PSS-9 PSS-9 GT-3
GT-3 Street/Track Moton Clubsport Custom main/tender package GT-3 (stock)

Chassis Tuning & Modifications

Tires

Modification To Reduce Understeer or Increase Oversteer To Reduce Oversteer or Increase Understeer
Front Pressure Increase in 2.5 lb increments Decrease in 2.5 lb increments
Rear Pressure Decrease in 2.5 lb increments Increase in 2.5 lb increments
Front Tire Width Increase Width Decrease width
Rear Tire Width Decrease Width Increase Width
Front Aspect Ratio Higher Ratio Lower Ratio
Rear Aspect Ratio Lower Ratio Higher ratio
Front Tread Depth Decrease Depth Increase Depth
Rear Tread Depth Increase Depth Decrease Depth

Wheels

Front wheel width Wider Narrower
Rear Wheel width Narrower Wider
Front wheel weight Lighter Heavier
Rear Wheel Weight Heavier Lighter

Alignment

Front Camber More Negative More Positive
Front Caster More Positive More Negative
Front Toe More Toe-out More Toe-in
Rear Camber More Positive More Negative
Rear Toe More Toe-out More Toe-in

Swaybars

Front Soften Stiffen
Rear Stiffen Soften

Spring or Torsion Bar Rates

Front Soften or Smaller Stiffen or Bigger
Rear Stiffen or Bigger Soften or Smaller

Shocks

Front Soften Stiffen
Rear Stiffen Soften

Suspension Bushings

Front Stiffen Soften
Rear Soften Stiffen

Brake Proportioning

Front Reduce Pressure Increase Pressure
Rear Increase Pressure Reduce Pressure

Weight Distribution

Front Reduce Increase
Rear Increase Reduce

Aerodynamics

Front Increase Downforce Decrease Downforce
Rear Decrease Downforce Increase Downforce

We also have the superb ERP Racing Suspension Systems and Products.

These are the very best no-compromise suspension parts available for the 911/930/964/993/996-series cars.

Call or e-mail us us for an individual consultation and recommendations for street or track suspension systems.

E-mail to: info@rennsportsystems.com or call 503.244.0990