Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - Do you drive an Exedy Stg. 2 Clutch? Come in and share your experience.

RallySTI · 10-09-2014, 11:44 AM

Thank you for the feedback of our products. I just went out and measured 5 random BRZ/FRS stage 2 clutch disc splines. First I tested against a Subaru spline guage. All five fit fine without issue and moved freely back and forth. I measure the major and minor spline diameter. The major diameter measured 25.2-25.8mm on all five samples. The blueprints state the majr diameter is 25.2mm +0.13mm/-0.00mm. The minor diameter measured 22.64-22.71mm. The blueprint states the minor diameter as 26.2mm +0.13mm/-0.00mm.

The BRZ/FR-S use the same Subaru spline as Impreza/Forester/Legacy etc. We are the OEM supplier to Subaru/Scion for the BRZ/FR-S. The same broach is used to cut the splines for all models, both OEM and aftermarket.

With most of these issues occuring after warm up it sounds like an issue with the hydraulic system. The clutch that comes OEM is VERY weak. The OEM clamp load when new is 1046lbs (4650N). The stage 1 and stage 2 clutch clamp load when new is 1652lbs (7350N). This is a 63% increase in clamp load over OEM. Most the time we try to keep the increase at no more than 30%. We do have this option as well part number TK07H and TK07T (clamp load is 1349lb). These are for the OEM flywheel and these kits are sold as cover/disc only (no bearings). However do not attempt to use on a boosted application as the wheel torque capacity assuming 20% driveline loss on stage 1 is 166ft/lbs (259ft/lbs clutch torque) and stage 2 is 199ft/lbs(311ft/lbs clutch torque).

Has anybody upgraded their OEM hydraulic system? Has anybody had Issues with Clutch Master, ACT, SPEC or Competition Clutch?

Appreciate the feedback.

Evan Cline @ Exedy

10-09-2014, 11:44 AM	#38
RallySTI Member Join Date: Oct 2014 Drives: 2013 Subaru BRZ Location: Toledo, Ohio Posts: 65 Thanks: 27 Thanked 45 Times in 31 Posts Mentioned: 1 Post(s) Tagged: 1 Thread(s)	Thank you for the feedback of our products. I just went out and measured 5 random BRZ/FRS stage 2 clutch disc splines. First I tested against a Subaru spline guage. All five fit fine without issue and moved freely back and forth. I measure the major and minor spline diameter. The major diameter measured 25.2-25.8mm on all five samples. The blueprints state the majr diameter is 25.2mm +0.13mm/-0.00mm. The minor diameter measured 22.64-22.71mm. The blueprint states the minor diameter as 26.2mm +0.13mm/-0.00mm. The BRZ/FR-S use the same Subaru spline as Impreza/Forester/Legacy etc. We are the OEM supplier to Subaru/Scion for the BRZ/FR-S. The same broach is used to cut the splines for all models, both OEM and aftermarket. With most of these issues occuring after warm up it sounds like an issue with the hydraulic system. The clutch that comes OEM is VERY weak. The OEM clamp load when new is 1046lbs (4650N). The stage 1 and stage 2 clutch clamp load when new is 1652lbs (7350N). This is a 63% increase in clamp load over OEM. Most the time we try to keep the increase at no more than 30%. We do have this option as well part number TK07H and TK07T (clamp load is 1349lb). These are for the OEM flywheel and these kits are sold as cover/disc only (no bearings). However do not attempt to use on a boosted application as the wheel torque capacity assuming 20% driveline loss on stage 1 is 166ft/lbs (259ft/lbs clutch torque) and stage 2 is 199ft/lbs(311ft/lbs clutch torque). Has anybody upgraded their OEM hydraulic system? Has anybody had Issues with Clutch Master, ACT, SPEC or Competition Clutch? Appreciate the feedback. Evan Cline @ Exedy