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MazdaSpeed 3/6 - Suspension & Brakes Discussion for suspension items like coilovers, springs, sway bars, mounts,chassis bracing and brakes.


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 Old 02-10-2012, 01:47 PM   #1
 
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Default H&R springs / Koni Yellow bumpstop question

Pulled the trigger on a set of H&R springs and Koni Yellows for my 08 MS3. I have been reading bump stop related threads for days now trying to decide what type to put in, and if any cutting is necessary. I know that my rear stops are still in decent condition, but the fronts are destroyed. SO... the main question is;

What are others with the same spring / strut / shock combo running? What stops did you end up using? Did you trim them? etc... I know there are FCM's and ground control, but which is best?

10 years ago i would have just slammed the car and dealt with it, but now I actually want a good ride with my low stance

Any input is appreciated.
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 Old 02-10-2012, 04:18 PM   #2
 
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Some are reporting the FC and GC are essentially the same height and of the same material. So if it were me I'd go with the cheaper one. I will always suggest leaving the rears untouched. They technically assist the rear springs during jounce.
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 Old 02-10-2012, 04:20 PM   #3
 
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^^This.
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 Old 02-10-2012, 05:40 PM   #4
 
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Originally Posted by Design View Post
Some are reporting the FC and GC are essentially the same height and of the same material. So if it were me I'd go with the cheaper one. I will always suggest leaving the rears untouched. They technically assist the rear springs during jounce.
shit... just dropped cash on the fatcat fronts... oh well! So the rears should remain the same length even with the car lowered?

thanks for the replys!
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 Old 02-10-2012, 06:11 PM   #5
 
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Yes. Most manufacturers offset the rear spring rate slightly to compensate.
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 Old 01-29-2013, 09:32 AM   #6
 
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Did you wind up cutting the front stops at all? Im going to start ordering parts next month so I want to get all my ducks in a row. I am going with swift R springs and koni yellows, probably with the whiteline WALK as well. Seems like everything im finding of worth is for the FSD's on stock or cobb springs...
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 Old 08-27-2013, 04:36 AM   #7
 
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Originally Posted by Design View Post
Some are reporting the FC and GC are essentially the same height and of the same material. So if it were me I'd go with the cheaper one. I will always suggest leaving the rears untouched. They technically assist the rear springs during jounce.
I hate to bump this thread, but is that right? I'm getting swift Springs on koni Yellows in the next few weeks and I just want to make sure I do it right. I shouldn't cut the rear or change them for the gc ones? This is just the first thread in searching that said that.
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 Old 08-27-2013, 10:15 AM   #8
 
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Most won't recommend replacing the rears. In addition to loss of spring rate under cornering, you'll have to find a way to reattach the dust shields. They are bolt-on plastic cylinders that attach to the third ring of rear jounce bumper.
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 Old 08-27-2013, 10:21 AM   #9
 
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Originally Posted by raigekijin View Post
I hate to bump this thread, but is that right? I'm getting swift Springs on koni Yellows in the next few weeks and I just want to make sure I do it right. I shouldn't cut the rear or change them for the gc ones? This is just the first thread in searching that said that.
Order the ground control bump stops. They are cheaper and work great. I would say don't cut the rears and see how it feels. I cut approx 1/2" off my rears with no negative effects. You will likely need to pull the rear shocks a time or two, so you can change the settings. You can cut them then if you feel necessary.
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 Old 09-30-2013, 12:03 PM   #10
 
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I have the yellows with Eibach pro springs. I didn't cut anything other than my knuckle when reattaching the rears. I left my original OEM stops on my rear shocks (full soft) and they are fine. The fronts (medium soft) have new OEM stops and pivot bearings. I would order a spare OEM pivot bearing for the front. One of them may go out with the tighter suspension. I have had to replace both after swapping the suspension. Note: the OEM bump stops are longer and softer than the FC stops.
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