Hello guys,
The car is a RF97 Van Diemen FC.
I have been reading up on shocks/springs and have a few questions on rebuilding them. I searched the apex archieves and got a few answers. What are some "do's" and "don'ts" of the job? I'm not looking to re-engineer the internals with different jets or needles, just thoroughly clean up what I have, replace the o-rings, replace the oil (5w Penske oil or "yellow" oil from Pegasus), and reset all the settings back to a solid baseline.
1- First off, I know that they are triple-adjustable Penske's but what exact model shocks do I have? old style 8760's? 8765's?
2-What are the 3 "shim-looking" rings between the spring retainer and the spring on one end of each of the shocks? What do they do? control suspension droop? bump steer? ride height?
3-What is a good baseline for front and rear? I have a Primus racing baseline guidebook for the "97 road course" that came with the car which suggests the following for Goodyear tires:
-FRONT-
SPRING RATE: 400lbs
SPRING PRELOAD: 6 turns from contact
RIDE HEIGHT: 28mm-34mm
PENSKE DAMPER VALVING PISTON: Linear 2 degrees bump/linear 1 degree rebound with 0.040 bleed (I'm not sure what this means)
SHIM STACKS: A-bump/d+rebound (I'm not sure what this means)
CANISTER PRESSURE: 200lbs
DAMPER SETTINGS: HIGH SPEED BUMP-6 off full hard/LOW SPEED BUMP-10 off full hard/REBOUND-7 off full hard
-REAR-
SPRING RATE: 650lbs
SPRING PRELOAD: 1 turn from contact
RIDE HEIGHT: 36mm-42mm
PENSKE DAMPER VALVING PISTON: 2 degree bump/digressive rebound 0.012 preload with 0.040 bleed (I'm not sure what this means)
SHIM STACKS: A-bump/E rebound (I'm not sure what this means)
CANISTER PRESSURE: 200lbs
DAMPER SETTINGS: HIGH SPEED BUMP-5 off full hard/LOW SPEED BUMP-10 off full hard/REBOUND-4 off full hard
-CHASSIS RAKE: 6mm-9mm
What do you guys think of this baseline? Outdated? Suggestions? Changes?
Thank you guys for the help,
Jon Updegrove
jonupdegroveracing@gmail.com
610-509-7321
The car is a RF97 Van Diemen FC.
I have been reading up on shocks/springs and have a few questions on rebuilding them. I searched the apex archieves and got a few answers. What are some "do's" and "don'ts" of the job? I'm not looking to re-engineer the internals with different jets or needles, just thoroughly clean up what I have, replace the o-rings, replace the oil (5w Penske oil or "yellow" oil from Pegasus), and reset all the settings back to a solid baseline.
1- First off, I know that they are triple-adjustable Penske's but what exact model shocks do I have? old style 8760's? 8765's?
2-What are the 3 "shim-looking" rings between the spring retainer and the spring on one end of each of the shocks? What do they do? control suspension droop? bump steer? ride height?
3-What is a good baseline for front and rear? I have a Primus racing baseline guidebook for the "97 road course" that came with the car which suggests the following for Goodyear tires:
-FRONT-
SPRING RATE: 400lbs
SPRING PRELOAD: 6 turns from contact
RIDE HEIGHT: 28mm-34mm
PENSKE DAMPER VALVING PISTON: Linear 2 degrees bump/linear 1 degree rebound with 0.040 bleed (I'm not sure what this means)
SHIM STACKS: A-bump/d+rebound (I'm not sure what this means)
CANISTER PRESSURE: 200lbs
DAMPER SETTINGS: HIGH SPEED BUMP-6 off full hard/LOW SPEED BUMP-10 off full hard/REBOUND-7 off full hard
-REAR-
SPRING RATE: 650lbs
SPRING PRELOAD: 1 turn from contact
RIDE HEIGHT: 36mm-42mm
PENSKE DAMPER VALVING PISTON: 2 degree bump/digressive rebound 0.012 preload with 0.040 bleed (I'm not sure what this means)
SHIM STACKS: A-bump/E rebound (I'm not sure what this means)
CANISTER PRESSURE: 200lbs
DAMPER SETTINGS: HIGH SPEED BUMP-5 off full hard/LOW SPEED BUMP-10 off full hard/REBOUND-4 off full hard
-CHASSIS RAKE: 6mm-9mm
What do you guys think of this baseline? Outdated? Suggestions? Changes?
Thank you guys for the help,
Jon Updegrove
jonupdegroveracing@gmail.com
610-509-7321
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