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Old 05-19-2013, 09:06 PM   #1
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whine after lowering

I just lowered my 2010 Mustang GT with the following:

Koni oranges
H&R springs
BMR upper and lower control arms
BMR Lower control arm relocation brackets
BMR upper control arm bracket
BMR panhard bar
MM caster camber plates

i drove ~15 miles to get it aligned going no faster than 40 mph. On the way home from the alignment i started hearing a whine at 60mph up through 80mph. I only hear the whine while under acceleration. I measured the pinion angle and found: +0.5 on the drive shaft and +3.0 on the yoke. Is this correct? Is there anything else the noise could be from?

Few more details: The car only has 9,500 miles. i drove it 85 miles immediately prior to lowering the car with no whine at all. While lowering the car i also painted the rearend, drive shaft and everything else that was rusty.
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Old 05-19-2013, 09:14 PM   #2
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1- Noise get's amplified when you get raid of all the stock rubber rear suspension parts.
Noise may have been there before.
2- Check you pinion angle.
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Old 05-19-2013, 09:20 PM   #3
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since you have practically the same setup I can tell you that the BMR UCA on mine was almost all the way pulled in. The two locking nuts had barely any gap between them and the alignment bolt nut.

Also your pinion angle for a manual should be between -2.0 and -3.0

pinion angle is drive shaft angle minus pinion yolk angle. Car has to be completely level and with the axle loaded to get a correct reading.

also which hole did you put your UCA in? Once mounted to the car my UCA is mounted in the very most bottom hole. Sits as close to the ground as possible.
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Old 05-19-2013, 09:31 PM   #4
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Quote:
Originally Posted by nosympathy View Post
since you have practically the same setup I can tell you that the BMR UCA on mine was almost all the way pulled in. The two locking nuts had barely any gap between them and the alignment bolt nut.

Also your pinion angle for a manual should be between -2.0 and -3.0

pinion angle is drive shaft angle minus pinion yolk angle. Car has to be completely level and with the axle loaded to get a correct reading.

also which hole did you put your UCA in? Once mounted to the car my UCA is mounted in the very most bottom hole. Sits as close to the ground as possible.
Why did you use the bottom hole on the UCA bracket?
Is it because of your drop.
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Old 05-19-2013, 09:33 PM   #5
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+0.5 driveshaft - +3.0 pinion yoke is -2.5 correct? i am getting my measurements while all 4 tires are sitting on cinder blocks.

I put the UCA arm in the upper hole per direction from BMR. The LCA are in the lowest hole.

Nosympathy - you don't have any whine?
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Old 05-19-2013, 09:49 PM   #6
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Quote:
Originally Posted by blacked out gt View Post
+0.5 driveshaft - +3.0 pinion yoke is -2.5 correct? i am getting my measurements while all 4 tires are sitting on cinder blocks.

I put the UCA arm in the upper hole per direction from BMR. The LCA are in the lowest hole.

Nosympathy - you don't have any whine?
not even a little bit. my rear end is dead super solid and very quiet. I expected all kinds of NVH from everything, really wasn't the case.

---------- Post added at 10:49 PM ---------- Previous post was at 10:47 PM ----------

Quote:
Originally Posted by racksteris View Post
Why did you use the bottom hole on the UCA bracket?
Is it because of your drop.
that and it said it was the hole for drag applications which is what I have my LCA set too. Figured I'd match them. Also the upper hole seemed like the UCA might hit the frame of the car when the springs compress. This does not happen on the lower hole. Might not on the upper hole, but I am beyond happy with how it turned out.
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