 
     |
| Rear suspension seems to bottom out over medium bumps in road and dips.. ??? (Page 1/3) |
|
phils88GT
|
OCT 22, 10:17 PM
|
|
I have an 88 GT with factory everything. Last year I changed out the worn our rear struts with KYB GR2's and the front, along with all ball joints, tie rods, etc. Weird thing is, the rear suspension, when hit just the right bump or dip in the road at just the right speed, feels like it is bottoming out. Not sure what to do about this. Anyone else have similar issues?
thanks
|
|
|
Patrick
|
OCT 22, 11:06 PM
|
|
And this is with factory (non-cut) springs? 
Even with lowering/cut springs in both my '84 and Formula, I've never had the rear suspension bottom out on either car.
|
|
|
|
fieroguru
|
OCT 23, 06:57 AM
|
|
The 88 rear springs are quite soft at about 145 lb/in, so the rear bump stops are pretty important. Did you replace those when you swapped struts?
|
|
|
|
phils88GT
|
OCT 23, 08:03 AM
|
|
They are uncut factor springs in the back. I will have to check on the bump stops. Been a while since I have been back there really to look at anything.
Is there anything out there in the way of stiffer springs that don’t lower the car a ton?
|
|
|
|
Vintage-Nut
|
OCT 23, 10:16 AM
|
|
|
|
|
phils88GT
|
OCT 27, 08:20 AM
|
|
|
Is there any way to stiffen up the rear suspension of the 88 GT without much lowering? It just seems far too soft, causing my bottoming out issues...
|
|
|
Vintage-Nut
|
OCT 27, 09:19 AM
|
|
IMHO
With uncut factor springs, I bet your suspension issue is your KYB GR2 strut choice and not the springs.
This is called suspension dampen {Compression and Rebound} that control the energy generated by springs.
*Compression rates depend on how quickly the shock/strut compresses the spring
High compression compresses slowly / Low compression compress quickly
*Rebound rate is how fast it returns to its original, uncompressed state
High rebound allows for a softer ride / Low rebound is for stiffer.
KYB GR2 has less dampen
KYB Excel-G has more dampen
------------------
Original Owner of a Silver '88 GT
Under 'Production Refurbishment' @ 136k Miles
|
|
|
|
fieroguru
|
OCT 27, 10:53 AM
|
|
New bump stops would likely fix the issue. The springs rates don't change significantly, so strut wear and bump stops are the likely cause.
Some of my customers switched to coilovers to get stiffer spring rates while keeping the ride height stock, but that is much, much more expensive than just replacing the bump stops.
|
|
|
Vintage-Nut
|
OCT 27, 03:49 PM
|
|
Listen to fieroguru - he is in the Fiero Suspension Business!
And especially if you didn't replace the bump stops when you {or the shop} installed the new struts...........
|
|
|
|
phils88GT
|
OCT 27, 05:35 PM
|
|
Thank you for the advice. I installed these struts about 8 months ago. I would say they have less than 2500 miles on them. I can’t say I remember them even having bump stops on them though.
Will have to check. Next weekend probably.
|
|
|
