Knocking in suspension - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

spadz93 · 01-28-2020, 07:14 AM

Last weekend, me and a buddy installed 1" brand new BMR lowering springs on the car. Before we started, there weren't any pronounced noises, but now if I go over a bump that's a little harsher (not a pothole), I'll hear a thudding coming from the back.

I went back over the work and made sure to triple check everything and make sure everything's cranked down, but I'm at a loss for where this noise could be coming from. We even used a shock compressor to make sure the shock hats were fully seated. The only thing I can think of is that the bushings weren't re-indexed because we were working on jackstands, and I blew a bushing out from driving the car too much without doing this. I also didn't see any bump stops in the suspension, not sure if that's a mag ride thing or not. Running the factory mag ride, about 15k on these shocks and about 50k on the car, nothing else was changed.

Crash76 · 01-28-2020, 04:52 PM

When you lower the car you have to loosen the suspension bolts and retighten them with a load on the wheels/car.

Coop[580 · 01-28-2020, 05:38 PM

Let’s see the stance when u get a chance. I’m still in limbo on wether to do the 1in drop springs. I’m leaning towards doing them. Let me know what u think minus the problem your having now

ZMEnow · 01-28-2020, 11:57 PM

Quote:

Originally Posted by Crash76

When you lower the car you have to loosen the suspension bolts and retighten them with a load on the wheels/car.

Ditto. And remember that lower arm bolt has a torque to yield spec.

01-28-2020, 07:14 AM	#1
spadz93 BUMBL Z Drives: 2015 ZL1 Join Date: Nov 2013 Location: Northern NJ Posts: 2,577 View My Garage	Knocking in suspension Last weekend, me and a buddy installed 1" brand new BMR lowering springs on the car. Before we started, there weren't any pronounced noises, but now if I go over a bump that's a little harsher (not a pothole), I'll hear a thudding coming from the back. I went back over the work and made sure to triple check everything and make sure everything's cranked down, but I'm at a loss for where this noise could be coming from. We even used a shock compressor to make sure the shock hats were fully seated. The only thing I can think of is that the bushings weren't re-indexed because we were working on jackstands, and I blew a bushing out from driving the car too much without doing this. I also didn't see any bump stops in the suspension, not sure if that's a mag ride thing or not. Running the factory mag ride, about 15k on these shocks and about 50k on the car, nothing else was changed. __________________ Sold: 2015 ZL1 M6, Rotofab Intake, LS3 throttle body, 2.55 Upper/9.17 Lower, Custom Camshaft, DMS Reinforced Brick, ID1050X, 1 7/8" Headers, ProSpeed HX/Reservoir, DSX Aux Pump/Flex Fuel Sensor, E85, McLeod RXT, BMR 1" Drop, 680rw 93/750rw E85, Tuned by CSP Sold: 2010 2SS, some bolt ons, 415rwhp/400rwtq Last edited by spadz93; 01-28-2020 at 07:38 AM.

01-28-2020, 05:38 PM	#3
Coop[580 Drives: 2012 ZL1 Ashen Grey Join Date: Apr 2017 Location: NW Indiana Posts: 378	Let’s see the stance when u get a chance. I’m still in limbo on wether to do the 1in drop springs. I’m leaning towards doing them. Let me know what u think minus the problem your having now __________________ 2012 M6 Kooks 1 7/8, off road pipes , full corsa exhaust ID1300s/ 22% lower / 2.5 upper, JLT CAI, DSX flex fuel, DSX AUX fuel pump. S19 cam Tuned and built by Speed Inc 635/632-93 octane 725/738-E85

01-28-2020, 04:52 PM	#2
Crash76 Team 913 Drives: '14 ZL1, '15 Jeep GC, ‘22 Ram 2500 Join Date: Apr 2015 Location: USA, Central CA Posts: 1,119	When you lower the car you have to loosen the suspension bolts and retighten them with a load on the wheels/car.