Pinion angle - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

twag4 · 07-21-2018, 12:11 PM

I have a drivetrain vibration with my cd009 vq transmission swapped 2013. I have 600hp driveshaft shop axles, and the PST carbon fiber driveshaft that came with the transmission kit. One of the axles has issues, it is slinging a lot of grease out of the outer cv boot. The vibration only reveals itself above 70mph. I am swapping back stock ads for now, to try and eliminate that as a possibility and to get DS shop to deal with the grease issue. (Still awaiting their reply as I just messaged them). My question is about pinion angle. It is very difficult to compare the transmission output angle to differential pinion angle, but that could cause my vibration. Is there a way to adjust pinion angle on our cars? Please advise!

Ultramaroon · 07-21-2018, 02:21 PM

Both ring and pinion gears are shimmed to position axially but they are fixed in angle perpendicular to each other.

You should be able to identify the source of the vibration by its frequency. Does it follow wheel speed, or driveshaft speed?

https://demos.starbase7.net/t3Portal...00O5A01DX.html

twag4 · 07-21-2018, 11:22 PM

Quote:

Originally Posted by Ultramaroon

Both ring and pinion gears are shimmed to position axially but they are fixed in angle perpendicular to each other.

You should be able to identify the source of the vibration by its frequency. Does it follow wheel speed, or driveshaft speed?

https://demos.starbase7.net/t3Portal...00O5A01DX.html

Pinion angle is the angle in relation to the driveshaft. If the driveshaft is 3 degrees offset from the transmission output shaft, the pinion shaft needs to be -3 degrees offset from the driveshaft.

twag4 · 07-21-2018, 11:23 PM

So I put the stock axles back on, no difference. I suspect that my pinion angle does not mirror the transmission output shaft angle. Gotta figure out how to address that now.

Ultramaroon · 07-21-2018, 11:54 PM

Ok, that's a new term for me. Do you have any reason to believe your pinion gear is no longer coaxial with your output shaft?

humfrz · 07-22-2018, 02:08 AM

I'll guess that the vibration is caused by your car's driveshaft being out of balance ..

Is your new CF driveshaft a single piece or two piece?

humfrz

toyubie · 07-22-2018, 04:05 AM

Quote:

Originally Posted by humfrz

I'll guess that the vibration is caused by your car's driveshaft being out of balance ..

Is your new CF driveshaft a single piece or two piece?

humfrz

IIRC, the Mazworks kit is a single-piece but OP did not specify which kit he used. The other kits I found are steel shafts.

humfrz · 07-22-2018, 04:52 AM

Quote:

Originally Posted by twag4

So I put the stock axles back on, no difference. I suspect that my pinion angle does not mirror the transmission output shaft angle. Gotta figure out how to address that now.

I found this educational (for me at least) ..

https://www.quickperformance.com/Pin...ent_ep_45.html

humfrz

sid94 · 07-22-2018, 10:14 AM

Maybe you got the height wrong when you got the trans mount welded in?

Sent from my iPhone using Tapatalk

twag4 · 07-22-2018, 10:18 AM

Yes MazWerks kit. There is really not enough room to manipulate the transmission much. The overpipe will hit either the body of th car or the sway bar. I tried to just match the original engine angle. Trying to measure the transmission output angle is difficult due to lack of room. I will pull the driveshaft soon and use the end of the transmission shaft to measure.

twag4 · 07-22-2018, 10:18 AM

And it is a one piece carbon fiber driveshaft

gtengr · 07-22-2018, 11:07 AM

Have you tried clocking the driveshaft 180 degrees?

Ultramaroon · 07-22-2018, 12:43 PM

Quote:

Originally Posted by gtengr

Have you tried clocking the driveshaft 180 degrees?

Interesting idea. For the sake of description, if the driveshaft's axis of rotation is lined up with an imaginary z-axis, it is symmetrical about the x and y planes. In my head, that means clocking angle would have no effect. Am I missing something?

Ultramaroon · 07-22-2018, 01:02 PM

Quote:

Originally Posted by twag4

Yes MazWerks kit. There is really not enough room to manipulate the transmission much. The overpipe will hit either the body of th car or the sway bar. I tried to just match the original engine angle. Trying to measure the transmission output angle is difficult due to lack of room. I will pull the driveshaft soon and use the end of the transmission shaft to measure.

Is there room to line a straight edge up with one of the side ribs in the transmission housing?

Also, do you have a local shop that can verify the integrity of your new driveshaft?

07-21-2018, 12:11 PM	#1
twag4 Senior Member Join Date: Sep 2013 Drives: frs Location: The depths Posts: 749 Thanks: 355 Thanked 427 Times in 241 Posts Mentioned: 5 Post(s) Tagged: 2 Thread(s)	Pinion angle I have a drivetrain vibration with my cd009 vq transmission swapped 2013. I have 600hp driveshaft shop axles, and the PST carbon fiber driveshaft that came with the transmission kit. One of the axles has issues, it is slinging a lot of grease out of the outer cv boot. The vibration only reveals itself above 70mph. I am swapping back stock ads for now, to try and eliminate that as a possibility and to get DS shop to deal with the grease issue. (Still awaiting their reply as I just messaged them). My question is about pinion angle. It is very difficult to compare the transmission output angle to differential pinion angle, but that could cause my vibration. Is there a way to adjust pinion angle on our cars? Please advise! __________________

07-21-2018, 02:21 PM	#2
Ultramaroon 義理チョコ Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 31,866 Thanks: 52,121 Thanked 36,516 Times in 18,918 Posts Mentioned: 1106 Post(s) Tagged: 9 Thread(s)	Both ring and pinion gears are shimmed to position axially but they are fixed in angle perpendicular to each other. You should be able to identify the source of the vibration by its frequency. Does it follow wheel speed, or driveshaft speed? https://demos.starbase7.net/t3Portal...00O5A01DX.html __________________ service manuals

07-21-2018, 11:23 PM	#4
twag4 Senior Member Join Date: Sep 2013 Drives: frs Location: The depths Posts: 749 Thanks: 355 Thanked 427 Times in 241 Posts Mentioned: 5 Post(s) Tagged: 2 Thread(s)	So I put the stock axles back on, no difference. I suspect that my pinion angle does not mirror the transmission output shaft angle. Gotta figure out how to address that now. __________________

07-21-2018, 11:54 PM	#5
Ultramaroon 義理チョコ Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 31,866 Thanks: 52,121 Thanked 36,516 Times in 18,918 Posts Mentioned: 1106 Post(s) Tagged: 9 Thread(s)	Ok, that's a new term for me. Do you have any reason to believe your pinion gear is no longer coaxial with your output shaft? __________________ service manuals

07-22-2018, 10:18 AM	#10
twag4 Senior Member Join Date: Sep 2013 Drives: frs Location: The depths Posts: 749 Thanks: 355 Thanked 427 Times in 241 Posts Mentioned: 5 Post(s) Tagged: 2 Thread(s)	Yes MazWerks kit. There is really not enough room to manipulate the transmission much. The overpipe will hit either the body of th car or the sway bar. I tried to just match the original engine angle. Trying to measure the transmission output angle is difficult due to lack of room. I will pull the driveshaft soon and use the end of the transmission shaft to measure. __________________

07-22-2018, 02:08 AM	#6
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 29,866 Thanks: 28,787 Thanked 31,813 Times in 16,424 Posts Mentioned: 708 Post(s) Tagged: 2 Thread(s)	I'll guess that the vibration is caused by your car's driveshaft being out of balance .. Is your new CF driveshaft a single piece or two piece? humfrz

07-22-2018, 10:14 AM	#9
sid94 Senior Member Join Date: Jan 2014 Drives: 2013 frs Location: Miami fl Posts: 206 Thanks: 38 Thanked 49 Times in 38 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Maybe you got the height wrong when you got the trans mount welded in? Sent from my iPhone using Tapatalk

07-22-2018, 11:07 AM	#12
gtengr Senior Member Join Date: Nov 2016 Drives: 2017 BRZ Location: USA Posts: 655 Thanks: 326 Thanked 258 Times in 177 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Have you tried clocking the driveshaft 180 degrees?

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