always faster

iTrader: (6)

I know that this topic has been beaten to death and i search a lot,even have done a post like 3 years ago but im still lost with the stupid noise and vibe.So ill get has more precise that i can.

I get kinda lot of noise over 70mph and noise and vibration over 100mph(kinda scary).I probably don't understand how to adjust my TA correctly...

Here are the fact/test:

-Stock TA with stock 10 bolts = no noise,no vibe
-Sphon adj chassis mount TA with stock 10 bolts = noise and vibe
-Spohn adj chassis mount Ta with strange 12 bolts = noise and vibe
-Sphon adj chassis mount TA with strange 12 bolts and new sphon shotgun driveshaft = noise and vibe

I then change the Ta because i hate the clunk noise from the chassis mount Ta.

-UMI full lentgh adj TA with relocation trans brackets with strange 12 bolts and spohn shotgun driveshaft = noise and vibe

So the problem is not the rear end or the DS and u-joint its probably the bad angle that i ve set...Could you help me and give me the basic on this.

Ex:
-If my DS point 1.5 degree down toward the back of the car
-If my diff point 1.5 degree down toward the front of the car(degree took on the flat part of the ta under the pumpkin)

Does this mean that i got a - 3 degree or a 0 degree pinion angle???

Ex 2 :
-If my DS point 2 degree down toward the back of the car
-If my diff point 1 degree down toward the front of the car(degree
took on the flat part of the ta under the pumpkin)

Does this mean that i got a -3 degree or a -1 or a 1 degree pinion angle???

Does the angle from the diff(flat TA parts) needs to be higher than the ds one.(ex: ds is 1 degree down and diff pointing 2 degree down) or it doesnt matter.

I read on the TA instruction that if you got 2 degree down on the ds and 2 degree down on the diff/pumpkin/flat part of TA and you get 0 degree pinion angle

On this link below if you got 2 degree down on the ds and 2 degree down on the diff/pumpkin/flat part of the TA you got -4 degree pinion angle
http://www.ssz28.com/tech/Pinionangle.html

I also saw/read that you should take the crank/trans(drivetrain) angle and match it by the opposite with the diff angle(ex: if your crank/trans(drivetrain) is leaning down by 2 degree you diff should point upward 2 degree to achieve 0 degree).Check this link:
http://www.streetissuecustoms.com/pinionangle.html

Damn could you help me clear this up for me and don't be shy to give me a
couple of example.My goal is to clear all the vibe and the noise to finnally drive the car

Thanks

Eric

jmd

iTrader: (4)

Have you tried (amt. of angle at the trans. + 1 or 2) at the pinion?

camar0corey

iTrader: (22)

Here is the site I've used as a guide: adjusting torque arm.

I don't have the angle finder in front of me, but I can't picture in my head which way the values would be in your example. I think on the angle finder it tells you if you are positive or negative.

SS RRR

iTrader: (2)

I don't believe the finder displays negative numbers. Just zero and a count of numbers on each side. As stated in one of those links if you place the angle finder and are looking at it on the drivers side the numbers on the right side of zero are negative values. When the pinion is being adjusted and moving towards the ground it is being adjusted at a negative value.

C_Rules

iTrader: (7)

go to the bmr website they actually have a good video and explanation of the whole process on an fbody.

Example 1 answer 0
Example 2 answer -1


just some math pointers below which might help you figure things out

-3 - (-3) = 0
-3 - 3 = -6

3 - (-3) = 6
3 - 3 = 0

SS RRR

iTrader: (2)

Takes me back to elementary math. I had forgotten two negatives equal a positive.

always faster

iTrader: (6)

Quick one here:

If i take the angle measure on the crank pulley it will be the same has the tranny output shaft since the engin/trans are align and doesnt deflect?

Thanks

wrd1972

iTrader: (12)

Yes. I always take my reading off of the harmonic balancer.

always faster

iTrader: (6)

Well thanks

So for my problem here are the numbers that i got right now.

-The engine/trans/tranny output shaft is pointing 2.4 degree down toward the rear of the car(of course)

-My DS is pointing 2.4 degree upward toward the rear of the car

-My diff pinion is pointing 3.7 degree downward toward the front ont the car.

Im kinda confused right now my ds should follow the angle that my engin/trans got???Right now my engin/trans is pointing down and my ds is pointing up.

GIZMO

iTrader: (8)

Is your car lowered? Or, have you done something with the engine/transmission mounts?

always faster

iTrader: (6)

Yep car is lowered with Stranos springs(about 1.5 inch i think)

always faster

iTrader: (6)

Yep car is lowered with Stranos springs(about 1.5 inch i think)

GIZMO

iTrader: (8)

I have a feeling that some of your issue might be here. Lowering the car 1.5" shouldn't mess with you much, but having the transmission, etc. pointing down hill will.

always faster

iTrader: (6)

Any sugestion? Im not the only one who run this relocation trans bracket

robsquikz28

iTrader: (246)

lca relocation brackets will center the tq arm better.... but watch the video of bmr adjusting the tq arm its very easy and you dont need the lca brackets but they help

C_Rules

iTrader: (7)

your pinion angle doing it the way spohn and bmr recommend using the driveshaft and flat piece of the torque arm that mounts to the rear would net you +6.1 with the numbers you have given above.

2.4 - (-3.7) = +6.1

also remmeber that this is a higly debated topic and people do it different ways and even throw in the engine angle in the mix. you will read different articles and they will say different things that will just aid in confusing you. i simply chose to go with what the major manufacturers recommended. you should really check out the video on the bmr website.

BMR Sales2

iTrader: (40)

Here is the video that you guys are tlaking about. It makes adjusting the pinion angle a breeze.

http://www.bmrtvonline.com/video_detail.php?mId=3788

If you need any further help just give us a call at the shop. (813)986-9302

always faster

iTrader: (6)

Well i ve watch the video at least 30 times(specialy the calculation method) and i came to this.

I want a 0 degree angle because i want it to be the most quiet

So my driveshaft point upward by 2.4 degree so its a positive 2.4
And my rear end is pointing downward by 2.4 degree so its a negative 2.4

BMR calculation:

Rear End Angle: -2.4
+
Driveshaft Angle: 2.4
=
0 degree

So it would be good...right?????

BMR Sales2

iTrader: (40)

PM sent back to you.

camar0corey

iTrader: (22)

Actually watching that video just made it more confusing to me.

I always used driveshaft-angle of the rear. That video said BMR uses rear end angle+driveshaft. So say you have -3 for the drive shaft and -2 for the rear. Using one method yields -1 while the other way yields -5.

This now has me confused??