New Product: Bilstein + Hypercoil Kit
11-24-2008, 09:41 PM
#16
Rennlist Member
I will also say that the more I drive cars with Bilstein/Eibach it makes me want to vomit. The progressive springs I think are total crap, and allow the car to wallow and pitch in a way that is gone with the straight rate 600/400 Hypercoils. I would rather drive a 928 with soft stock springs and Bilsteins than with the Eibachs. At least the valving is a good match to the springs.
Sorry to be such a bastard about this, but my quest for better suspension was a long one. I also found that the Blue Ridge Parkway was the only great place to test suspension, and we only go there every June for SITM... My local roads are no good for testing stuff.
Sorry to be such a bastard about this, but my quest for better suspension was a long one. I also found that the Blue Ridge Parkway was the only great place to test suspension, and we only go there every June for SITM... My local roads are no good for testing stuff.
Now that its been a few years I'm ready to go back in and change the Eibachs for stock. There was no doubt the OEM Boges were shot.
11-25-2008, 08:39 AM
#18
Just chiming in with another data point, I have the adjustable Koni and Hypercoil kit from carl on my 79 5spd, (600/400 spring rates) and it rocks. Totally driveable on the street, but nice on the track as well. Goes round the Nurburgring really nicely too.
I weighed the parts on the bathroom scale when I did the installation, and there was something like a 4kg weight saving per corner as well.
Joel
I weighed the parts on the bathroom scale when I did the installation, and there was something like a 4kg weight saving per corner as well.
Joel
11-25-2008, 10:23 AM
#19
Nordschleife Master
That is a very nice side benefit and one large reason why i think i will go with the hypercoils on the next car i purchase
thanks for the feedback
11-25-2008, 10:49 AM
#20
Developer
Thread Starter
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.
11-25-2008, 10:51 AM
#21
Developer
Thread Starter
The outside tube on a 928 Koni shock is the fluid reservoir the smaller inside tube has the piston and does the work , very old twin tube technology. The Bilstein is a single tube mono shock design and as such can have a larger working piston in a smaller body as well as other design features. Koni offers mono tubes as well just not for the 928....
11-25-2008, 06:11 PM
#25
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I think a reasonable set-up might be 400/300 or 400/275 with Bilsteins. Then maybe stiffer sway bars if you wanted to control body roll. The re-valve is probably cheaper than even just a front sway bar though... Then the 600/400 keep everything flat as a pancake.
11-25-2008, 06:27 PM
#26
Nordschleife Master
I would be running 19" wheels (But from experience the 19"s with more modern rubber rode much better then the 17's with inferior tires)
11-25-2008, 06:37 PM
#27
Developer
Thread Starter
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.
11-25-2008, 06:53 PM
#28
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I do think a good street set up for many would be stock springs and the off the shelf Bilsteins. I do think the great Bilsteins are just under damped for even the eibach progressive springs.
Revalving is cheap, it's just a pain in the ***. Your 928 will be on jackstands for 2-3 weeks waiting for the shocks to come back. I think it is very worth it though.
11-25-2008, 07:23 PM
#29
928RC51 - I want to send in my bilsteins for the same re valving you did. I think the work center is right here in Poway, CA. Can you share (if you haven't already) the specific detail you gave them to valve the shocks properly for the 600/400 hypercoils?
11-25-2008, 07:24 PM
#30
Nordschleife Master
please post specifics