New Product: Bilstein + Hypercoil Kit
11-25-2008, 11:43 PM
#31
Drifting
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Talk to Ramone there, he does all the revalving. I asked him for 40% more low speed compression and 50% more rebound.
I got shock dynos back that were hard to interpret, so that's all the info I have. The dyno graphs and #s were posted in a thread I started back in April or May of '08.
I got shock dynos back that were hard to interpret, so that's all the info I have. The dyno graphs and #s were posted in a thread I started back in April or May of '08.
11-26-2008, 01:11 AM
#32
How are the low speed jitters?
11-26-2008, 04:58 AM
#33
Drifting
just to add my two cents - the orange car has bilsteins with hypercoils and spring rates of 650/425, i needed to revalve the bilsteins to cope with these springs, even for fast road use as they did not have enough rebound damping. the guys here at bilstein in the uk did a good job and id reccomend the valving they achieved (should be available to all bilstein service agents) especialy for a car that will see the track a fair amount.
11-26-2008, 06:54 PM
#34
Race Car
Good call wrt local roads, too
11-26-2008, 07:14 PM
#35
Administrator - "Tyson"
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So to sum up, if you want to run 600/400 or more springs, either re-valve the Bilstein's offered with this kit or just skip to the Koni's?
11-26-2008, 09:12 PM
#36
Rennlist Member
Adam,
I cannot hazard a guess as what shock you have without seeing them.
You may have the Koni Sport Yellow-style shock (no longer made for the 928)
with the little white **** on top. Or, like our $395 per Koni externally adjustable upgrade, you may have a **** on the bottom of the shock for adjusting compression stroke, and the little *** on top for adjusting the rebound. I dont know.
I cannot hazard a guess as what shock you have without seeing them.
You may have the Koni Sport Yellow-style shock (no longer made for the 928)
with the little white **** on top. Or, like our $395 per Koni externally adjustable upgrade, you may have a **** on the bottom of the shock for adjusting compression stroke, and the little *** on top for adjusting the rebound. I dont know.
I currently have the Crumb-spec Eibach springs that have the progessive windings. I think for street use and occasional track use these springs are excellent. However on the track, when I push it say 9/10's or more, I can get some behavior from the springs which can be a little unsettling at speed. I'm willing to give up the plush street ride of the Eibachs for a potentially stiffer street ride with heavier duty hypercoils if it means I will have 100% confidence when I'm pushing as hard as I can on the track, even though those track situations probably make up less then 1% of my overall time driving my 928.
11-27-2008, 07:06 AM
#37
Former Vendor
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Nice product Carl!
The below quote from Carl should be copied into everyone's "keeper folder" for anyone interested in 928 suspension modifications and what each setup will do and not do. Probably will need to be updated once Carl comes up with the remote reservoir adjustable shock set up.
Interestingly, my former 1986.5 928S track car came with JRZ double adjustable shocks at all four corners and Eibach springs. Also had the Devek front adjustable sway bar and one of the first sets of Professor Ott's rear sway bar links on the stock rear sway bar. The 928 was a dream to drive on the track and very nuetral with the shocks reset at their base levels for both bump and rebound. This great handling was later confirmed by Mark Anderson when he drove the car at the 2007 Sebring PCA club races. We only had to adjust the rear shock pressures a bit, made them lower, to make the car handle to his liking.
The current owner has not changed a thing on the suspension set up and he always surprises his PCA instructors on how well the "big heavy 928" can manage itself around the track.
Cheers,
Constantine
The below quote from Carl should be copied into everyone's "keeper folder" for anyone interested in 928 suspension modifications and what each setup will do and not do. Probably will need to be updated once Carl comes up with the remote reservoir adjustable shock set up.
Interestingly, my former 1986.5 928S track car came with JRZ double adjustable shocks at all four corners and Eibach springs. Also had the Devek front adjustable sway bar and one of the first sets of Professor Ott's rear sway bar links on the stock rear sway bar. The 928 was a dream to drive on the track and very nuetral with the shocks reset at their base levels for both bump and rebound. This great handling was later confirmed by Mark Anderson when he drove the car at the 2007 Sebring PCA club races. We only had to adjust the rear shock pressures a bit, made them lower, to make the car handle to his liking.
The current owner has not changed a thing on the suspension set up and he always surprises his PCA instructors on how well the "big heavy 928" can manage itself around the track.
Cheers,
Constantine
Keep in mind that each product has a target application where it perfroms well, and they perform less well when pulled outside of their intended use.
Example: Eibach springs. High quality, very good progressive rate springs. Very good for certain drivers and their application. But: high-performance drivers and racers will not like the spring rate changing mid-corner as a progressive spring will do, so they prefer constant rate springs, like Hypercoils. Lesson: dont blame the Eibachs. Blame the fella who takes a 7-iron and trys to tee off with it. Sure, they are both golf clubs, but...
Shocks: Want a high-quality all-around street shock that will laste a good long time? Bilstein. Want to stiffen your suspension with high-rate springs and need to control them? Koni's.
Both of these are less than say, Moton shocks with remote reservoirs, but at $1460 per wheel for Moton shocks, they are quite a bit cheaper and provide real good value.
We are trying to locate something for the racers that are better then the Konis, adjustable, and not as nuts expensive as the Motons. Its coming along, but this project is just down the list a tad compared to others we are working on.
Just wanted you to know that there will be a step up above the Konis and Bilsteins someday.
Example: Eibach springs. High quality, very good progressive rate springs. Very good for certain drivers and their application. But: high-performance drivers and racers will not like the spring rate changing mid-corner as a progressive spring will do, so they prefer constant rate springs, like Hypercoils. Lesson: dont blame the Eibachs. Blame the fella who takes a 7-iron and trys to tee off with it. Sure, they are both golf clubs, but...
Shocks: Want a high-quality all-around street shock that will laste a good long time? Bilstein. Want to stiffen your suspension with high-rate springs and need to control them? Koni's.
Both of these are less than say, Moton shocks with remote reservoirs, but at $1460 per wheel for Moton shocks, they are quite a bit cheaper and provide real good value.
We are trying to locate something for the racers that are better then the Konis, adjustable, and not as nuts expensive as the Motons. Its coming along, but this project is just down the list a tad compared to others we are working on.
Just wanted you to know that there will be a step up above the Konis and Bilsteins someday.
