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From what I have been told (by multiple suspensions manufacturers/builders) and read, BC, Border, Feal and some of those, are all the same manufacturer out of Taiwan. I know Border offers different top hats options for 997 but finding someone to get them is the hard part but it makes me believe that BC could source them as well.
I have mine maxed out of stiffness and still too soft. I have installed stiffer Swift springs and it helped but not enough. Front is perfect but the rear is where the issue is for me. They were designed for a C4 and guessing the turbos have more weight in the rear plus additional down force at speeds.
your correct… all those manufacturers are sourced by a Taiwan company… the affordable “rebuildable “
coilover…
mine is just a C2 .2, when I bought it the car was stock… but the owner had bought the BC’s new so I installed them.. I probably would have bought one of the other heavy hitters personally
Last edited by GT3twenty10; 04-07-2024 at 03:26 PM.
In that video that was the way the Indy shop adjusted the no preload… I get back home and that side was 1/4” lower than the other so I took off the wheel and “clunk clunk”… I did give it preload, about 5mm and I can still make it clunk by hand but I have to pull hard on it… so when the wheel is on the ground, you think that weight still gets off setted by a bump it’s enough to clunk? More preload??
roger that on preload^
If you have 5mm preload, you should not be able to move the spring by hand...
From what I have been told (by multiple suspensions manufacturers/builders) and read, BC, Border, Feal and some of those, are all the same manufacturer out of Taiwan. I know Border offers different top hats options for 997 but finding someone to get them is the hard part but it makes me believe that BC could source them as well. Best way to test your bearing on the top hats is to see how stiff they are when you move your top hats around. The issue is that it will throw your alignment off
I have mine maxed out of stiffness and still too soft. I have installed stiffer Swift springs and it helped but not enough. Front is perfect but the rear is where the issue is for me. They were designed for a C4 and guessing the turbos have more weight in the rear plus additional down force at speeds.
Maxed out front stiffness would insane. I'm probably around +6 to +8. Can def tell a difference between these and Ohlins on my e46 M3. The rebound/absorbing mainly.
If you have 5mm preload, you should not be able to move the spring by hand...
I can’t twist it unless I have rubber gloves and a mighty grip… I can however pull towards the top and still make it clunk a little. 5mm is a good
amount preload… so I’m not disagreeing with u
As others have said it's most likely your camber plates. Most aftermarket camber plates are monoball metal-on-metal so they'll make a bit of a knocking sometimes. I've had Elephant Racing camber plates, JRZ camber plates, Vorshlag (in BMWs), etc and they've all made knocking/clunking noises on harsh bumps at lower speeds.
As others have said it's most likely your camber plates. Most aftermarket camber plates are monoball metal-on-metal so they'll make a bit of a knocking sometimes. I've had Elephant Racing camber plates, JRZ camber plates, Vorshlag (in BMWs), etc and they've all made knocking/clunking noises on harsh bumps at lower speeds.
thus the reason I’m considering koni’s with H&R’s and calling it a day… 😂
preload: can anyone measure up front from top of the spring to the bottom of the spring. I’m just curious if I’m close on preload.. I’ve got the wheel off and I can twist the spring and shake it making the clunk… maybe I need more… granted it’s going to a little different each car. I’m about 6.5” to the bigger perch ring
Last edited by GT3twenty10; 04-07-2024 at 05:19 PM.
Maxed out front stiffness would insane. I'm probably around +6 to +8. Can def tell a difference between these and Ohlins on my e46 M3. The rebound/absorbing mainly.
My front are at 10 on the stiffer side with 6k Swift springs, my rear are maxed out on the stiffer settings with as much preload as possible and 13k Swift springs. My wife loves the ride because it is comfortable when riding around but it is on the soft side to really push the car on high speed turns with confidence.
[QUOTE=rsalicrup;19374857]My front are at 10 on the stiffer side with 6k Swift springs, my rear are maxed out on the stiffer settings with as much preload as possible and 13k Swift springs. My wife loves the ride because it is comfortable when riding around but it is on the soft side to really push the car on high speed turns with confidence.[/QUOTE
when you say as much as possible, what are we talking?
My front are at 10 on the stiffer side with 6k Swift springs, my rear are maxed out on the stiffer settings with as much preload as possible and 13k Swift springs. My wife loves the ride because it is comfortable when riding around but it is on the soft side to really push the car on high speed turns with confidence.[/QUOTE
when you say as much as possible, what are we talking?
Just enough that doesn’t bind during full compression. I think like 10-15mm.
wonder if that much will fix my fronts..? I’d imagine that much would have to turn with a wrench and not by hand?
It will not fix the clunking from a bearing. You will need the wrench the put any preload on the springs. Hearing some bearing noise should be normal. Is when they sound like maracas that’s when you should be worried.
thus the reason I’m considering koni’s with H&R’s and calling it a day… 😂
preload: can anyone measure up front from top of the spring to the bottom of the spring. I’m just curious if I’m close on preload.. I’ve got the wheel off and I can twist the spring and shake it making the clunk… maybe I need more… granted it’s going to a little different each car. I’m about 6.5” to the bigger perch ring
you’re in luck, had my wheels off today.. unfortunately I’m AWD, so might be different… odd that yours is shorter than mine
My newly purchased 997.1 turbo came with new Bilsteins B16 Damptronics (?). All sorts of slop but no noise. I do know the previous owner had returned the car to the installer because of noise but I don’t know what was done. My suspension pogosticks and is much too low. The top of that spring mount has about 1/4” of open space.
We seem to be in the same boat.
I can’t seem to attach my .mov.
Last edited by Sresites; 04-08-2024 at 05:08 AM.
Reason: Attachment problems
and if you grab that spring will is move out of place on top at all? Does the spring spin? Just curious .. thx for the pic. Im about 1/4” more preload than you. Is that the rear or maybe the 4S is different??
Last edited by GT3twenty10; 04-08-2024 at 06:53 AM.
04-07-2024, 03:24 PM
