Flywheel bolt torque? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Turdinator · 03-04-2013, 01:50 AM

So this little beauty arrived for me today but i can't find what to torque the bolts going into the crank should be tightened to. Anyone know?

Racecomp Engineering · 03-04-2013, 07:17 AM

Did you order the complete kit?

http://www.toda-racing.co.jp/en/prod...heel/fa20.html

Mw

Turdinator · 03-04-2013, 06:33 PM

Just the flywheel. I have been told a few times that the TODA clutch is just a rebadged exedy unit. Plus i aren't planning on going FI so the std clutch should be fine for me

FirestormFRS · 03-04-2013, 07:32 PM

They're plastic region bolts so don't reuse the old ones. I'd wager 50nm +90 +45degrees would be sufficient.

Turdinator · 03-04-2013, 07:37 PM

Quote:

Originally Posted by FirestormFRS

They're plastic region bolts so don't reuse the old ones. I'd wager 50nm +90 +45degrees would be sufficient.

Good to know. Do ARP make replacements?

FirestormFRS · 03-06-2013, 07:57 PM

Quote:

Originally Posted by Turdinator

Good to know. Do ARP make replacements?

Not sure.

cplabaunza · 03-06-2013, 08:08 PM

Do these lightweight Flywheels come balanced or do they need to be balanced by a machine shop prior to installing? I ask because for my Vette, balancing a lightweight flywheel was recommended if installing one. Thanks...

Flywheel Balancing Vid =
[ame="http://www.youtube.com/watch?v=sl8F_ZtMhNk"]Subaru Flywheel lightening and Balancing - YouTube[/ame]

Turdinator · 03-06-2013, 08:27 PM

Quote:

Originally Posted by FirestormFRS

Not sure.

Checked out the ARP 2013 catalogue and they don't list flywheel bolts for any Subaru engine unfortunately. If i can find the thread specs maybe something would match up though.

Quote:

Originally Posted by cplabaunza

Do these lightweight Flywheels come balanced or do they need to be balanced by a machine shop prior to installing? I ask because for my Vette, balancing a lightweight flywheel was recommended if installing one. Thanks...

The Toda lightweight flywheel comes balanced BUT I personally like to get my flywheel and clutch balanced together for peace of mind. I have had this done twice now on my old Celica with a Toda flywheel and Exedy HD clutch. The firts time they were already spot on balanced, the second there was only a slight imbalance which was corrected.

EDIT: I wouldn't recommend lightening your stock flywheel. Doing so can weaken it and the last thing you want is a flywheel failure at 7500rpm.

FirestormFRS · 03-06-2013, 08:49 PM

Just make sure you don't put drive plate bolts in place of flywheel bolts. The AT bolts are the same length and thread count but they do not stretch. Trying to stretch them will likely destroy your crank or break the bolt off.

King Tut · 03-07-2013, 01:51 PM

I bought new bolts from Subaru when I installed my ACT flywheel/clutch. I believe they are the same part number as for the STI. If nobody gets you the torque specs, I have them printed out of the factory service manual and can post them up tonight.

Turdinator · 03-07-2013, 06:12 PM

Quote:

Originally Posted by King Tut

I bought new bolts from Subaru when I installed my ACT flywheel/clutch. I believe they are the same part number as for the STI. If nobody gets you the torque specs, I have them printed out of the factory service manual and can post them up tonight.

Thats would be awesome. I dont suppose you have the bolt part numbers as well?

King Tut · 03-07-2013, 09:29 PM

Quote:

Originally Posted by Turdinator

Thats would be awesome. I dont suppose you have the bolt part numbers as well?

I can't find the receipt for the part numbers. The instructions in the manual state this:

Quote:

Tighten the eight bolts in the order as shown in the figure.
Standard value:T=85N·m {867kgf·cm} {62.7ft·lbf}

The order is 12 o clock, 6 o clock, 9 o clock, 3 o clock, 10 o clock, 4 o clock, 1 o clock, and 7 o clock. Basically pairs across from one another repeated.

Coheed · 03-08-2013, 12:10 AM

I have never in my life seen a TTY bolt used for flywheels. And those torque specs do not have a degree of stretch in the specs... so I don't think they are.

I'm not saying they aren't, but if they are it will be the first I've worked on. Of course, the FSM always recommends replacement parts for critical parts regardless of whether they are requiring replacement.

03-06-2013, 08:08 PM	#7
cplabaunza Member Join Date: Feb 2013 Drives: 2013 Scion FR-S Location: Bay Area, CA Posts: 74 Thanks: 6 Thanked 27 Times in 21 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Do these lightweight Flywheels come balanced or do they need to be balanced by a machine shop prior to installing? I ask because for my Vette, balancing a lightweight flywheel was recommended if installing one. Thanks... Flywheel Balancing Vid = [ame="http://www.youtube.com/watch?v=sl8F_ZtMhNk"]Subaru Flywheel lightening and Balancing - YouTube[/ame] __________________ Red 2014 SRT Viper GTS Whiteout 2013 Scion FR-S(SOLD) Cyber Grey Metallic 2012 Chevrolet Volt(SOLD) Black 2010 Victory Cross Country Black 2008 Chevrolet Corvette 1LT/NPP/Z51/M6(SOLD*)

03-07-2013, 01:51 PM	#10
King Tut NASA SpecE30 Racer Join Date: May 2012 Drives: 2006 Honda S2000 Location: Gulf Breeze, FL Posts: 7,279 Thanks: 607 Thanked 5,759 Times in 3,055 Posts Mentioned: 274 Post(s) Tagged: 10 Thread(s)	I bought new bolts from Subaru when I installed my ACT flywheel/clutch. I believe they are the same part number as for the STI. If nobody gets you the torque specs, I have them printed out of the factory service manual and can post them up tonight. __________________ - King Tut Street/Track Car: 2006 Honda S2000 TT3 \|\| Race Car: 1987 BMW 325is SpecE30 \|\| Tow Vehicle: 2014 RAM 1500 EcoDiesel Sold Cars: 2012 BMW M3 \|\| 2013 Subaru BRZ \|\| 2012 Porsche Cayman R \|\| 2009 Chevrolet Z06 \|\| 2009 BMW M3 \|\| 2004 BMW M3 \|\| 2004 Nissan 350Z

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03-04-2013, 07:17 AM	#2
Racecomp Engineering Join Date: Nov 2011 Drives: 2016 BRZ, 2012 Paris Di2 & 2018 STI Location: Severn, MD Posts: 5,517 Thanks: 3,541 Thanked 7,412 Times in 3,032 Posts Mentioned: 310 Post(s) Tagged: 9 Thread(s)	Did you order the complete kit? http://www.toda-racing.co.jp/en/prod...heel/fa20.html Mw

03-04-2013, 07:32 PM	#4
FirestormFRS Senior Member Join Date: Jul 2012 Drives: 2013 FR-S Location: Anytown Posts: 920 Thanks: 73 Thanked 643 Times in 302 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	They're plastic region bolts so don't reuse the old ones. I'd wager 50nm +90 +45degrees would be sufficient.

03-06-2013, 08:49 PM	#9
FirestormFRS Senior Member Join Date: Jul 2012 Drives: 2013 FR-S Location: Anytown Posts: 920 Thanks: 73 Thanked 643 Times in 302 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Just make sure you don't put drive plate bolts in place of flywheel bolts. The AT bolts are the same length and thread count but they do not stretch. Trying to stretch them will likely destroy your crank or break the bolt off.

03-08-2013, 12:10 AM	#13
Coheed Senior Member Join Date: Jun 2012 Drives: DGM BRZ Limited Location: Seattle Posts: 813 Thanks: 209 Thanked 225 Times in 157 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I have never in my life seen a TTY bolt used for flywheels. And those torque specs do not have a degree of stretch in the specs... so I don't think they are. I'm not saying they aren't, but if they are it will be the first I've worked on. Of course, the FSM always recommends replacement parts for critical parts regardless of whether they are requiring replacement.

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