New vibration after lowering - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

ClawSS · 11-06-2013, 12:44 PM

Pfadt springs installed followed by Aggressive Street alignment specs (as close as we could get with stock eccentrics).

New vibration detected right around 85-88 mph that continues through the 90's and ends around 108-110. I pop it into neutral and the vibration will come and go as the mph drops.

No vibration was detected at this speed prior to springs and alignment.

Give me options, please. I think maybe driveshaft harmonics (L99 so 3.23's) have become both audible and physical due to lowered pinion angle?

Wouldn't I feel a wheel balance issue in a different spot as well as the "high speed" spot? Like at 45 and at 90?

Maybe a trip to IPS on the 4-wheel?

ClawSS · 11-07-2013, 09:00 AM

Ok, no insights from the masses or experts?

How about the stock half-shaft angle? Were they flat and went + or were they - and went closer to 0?

Bmags · 11-07-2013, 08:02 PM

where do you feel the vibration, the seat of your pants or the does the steering wheel vibrate back and forth?

ClawSS · 11-07-2013, 08:16 PM

Right in the seat. Coke bottle vibrates in the cup holder. Steering wheel smooth as silk.

Bmags · 11-07-2013, 08:38 PM

your vibration is most likely coming from one of your rear wheels, I would suspect it lost a wheel weight. I would recheck the rear wheel balance first, also check for trueness of the wheels at the same time. If this checks out ok then its a driveline vibration like driveshaft or coupling disc. It doesn't take a lot of missing weight to make a pretty bad vibration at higher speeds. At lower speeds its most often not present or so slight it goes without notice.

ClawSS · 11-13-2013, 08:16 AM

Both rear wheels were out by .75oz. Road force balanced just fine after that. I have not been able to "retest" but suspect the vibration to be all but gone as .75 is not a small amount. thank you.

11-06-2013, 12:44 PM	#1
ClawSS High-tech Redneck Drives: '10 CGM SS, '02 2500HD, '09 300SRT8 Join Date: Nov 2010 Location: Lexington, KY Posts: 757	New vibration after lowering Pfadt springs installed followed by Aggressive Street alignment specs (as close as we could get with stock eccentrics). New vibration detected right around 85-88 mph that continues through the 90's and ends around 108-110. I pop it into neutral and the vibration will come and go as the mph drops. No vibration was detected at this speed prior to springs and alignment. Give me options, please. I think maybe driveshaft harmonics (L99 so 3.23's) have become both audible and physical due to lowered pinion angle? Wouldn't I feel a wheel balance issue in a different spot as well as the "high speed" spot? Like at 45 and at 90? Maybe a trip to IPS on the 4-wheel? __________________ "My friends call me Chris. Are you my friend?" 2010 CGM L99 2SS/RS - GPI SS3 VVT, BTR DoD Delete, Circle D 4c, BTR springs, Katech C5R Timing Chain, MRR-228 315/275, CAI, Elite catch-can, TSP 1 7/8" Headers + offroad pipes, Magnaflow 3", Pfadt springs, BMR LCAs, toelinks, trailing arms, cradle bushings, & sway bars w/ endlinks, Vitesse paddles, heritage grille, and an eBay splitter. Power upgrades by Race Proven Perf.; Tuning by ShorTuning.

11-07-2013, 09:00 AM	#2
ClawSS High-tech Redneck Drives: '10 CGM SS, '02 2500HD, '09 300SRT8 Join Date: Nov 2010 Location: Lexington, KY Posts: 757	Ok, no insights from the masses or experts? How about the stock half-shaft angle? Were they flat and went + or were they - and went closer to 0? __________________ "My friends call me Chris. Are you my friend?" 2010 CGM L99 2SS/RS - GPI SS3 VVT, BTR DoD Delete, Circle D 4c, BTR springs, Katech C5R Timing Chain, MRR-228 315/275, CAI, Elite catch-can, TSP 1 7/8" Headers + offroad pipes, Magnaflow 3", Pfadt springs, BMR LCAs, toelinks, trailing arms, cradle bushings, & sway bars w/ endlinks, Vitesse paddles, heritage grille, and an eBay splitter. Power upgrades by Race Proven Perf.; Tuning by ShorTuning.

11-07-2013, 08:16 PM	#4
ClawSS High-tech Redneck Drives: '10 CGM SS, '02 2500HD, '09 300SRT8 Join Date: Nov 2010 Location: Lexington, KY Posts: 757	Right in the seat. Coke bottle vibrates in the cup holder. Steering wheel smooth as silk. __________________ "My friends call me Chris. Are you my friend?" 2010 CGM L99 2SS/RS - GPI SS3 VVT, BTR DoD Delete, Circle D 4c, BTR springs, Katech C5R Timing Chain, MRR-228 315/275, CAI, Elite catch-can, TSP 1 7/8" Headers + offroad pipes, Magnaflow 3", Pfadt springs, BMR LCAs, toelinks, trailing arms, cradle bushings, & sway bars w/ endlinks, Vitesse paddles, heritage grille, and an eBay splitter. Power upgrades by Race Proven Perf.; Tuning by ShorTuning.

11-13-2013, 08:16 AM	#6
ClawSS High-tech Redneck Drives: '10 CGM SS, '02 2500HD, '09 300SRT8 Join Date: Nov 2010 Location: Lexington, KY Posts: 757	Both rear wheels were out by .75oz. Road force balanced just fine after that. I have not been able to "retest" but suspect the vibration to be all but gone as .75 is not a small amount. thank you. __________________ "My friends call me Chris. Are you my friend?" 2010 CGM L99 2SS/RS - GPI SS3 VVT, BTR DoD Delete, Circle D 4c, BTR springs, Katech C5R Timing Chain, MRR-228 315/275, CAI, Elite catch-can, TSP 1 7/8" Headers + offroad pipes, Magnaflow 3", Pfadt springs, BMR LCAs, toelinks, trailing arms, cradle bushings, & sway bars w/ endlinks, Vitesse paddles, heritage grille, and an eBay splitter. Power upgrades by Race Proven Perf.; Tuning by ShorTuning.

11-07-2013, 08:02 PM	#3
Bmags Drives: 2013 Camaro 2SS/RS SIM Join Date: Mar 2013 Location: Maryland Posts: 106	where do you feel the vibration, the seat of your pants or the does the steering wheel vibrate back and forth?

11-07-2013, 08:38 PM	#5
Bmags Drives: 2013 Camaro 2SS/RS SIM Join Date: Mar 2013 Location: Maryland Posts: 106	your vibration is most likely coming from one of your rear wheels, I would suspect it lost a wheel weight. I would recheck the rear wheel balance first, also check for trueness of the wheels at the same time. If this checks out ok then its a driveline vibration like driveshaft or coupling disc. It doesn't take a lot of missing weight to make a pretty bad vibration at higher speeds. At lower speeds its most often not present or so slight it goes without notice.