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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 12-09-2019, 11:45 PM   #57
Steveiam
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Did it overheat even with a transmission cooler?
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Old 12-10-2019, 01:06 AM   #58
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Originally Posted by 86TOYO2k17 View Post
Im torn between doing clutch pack / valve body or attempting a swap to a different auto.
Wish someone made an easy solution to swap in a ZF 8HP. An 8 speed with 6 usable gears and holding 400+wtq with ease would be amazing. 3-4 is just too long we need an in-between gear and then 5th is not really usable.


Time for an os giken rear diff.


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Old 12-10-2019, 01:16 AM   #59
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Time for an os giken rear diff.


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That would be cool if/when i am making more power and have a solid transmission setup already.

I want to stay auto. And want a trans capable of 350+ wtq, and a nice bonus would be better gearing. The zf 8hp would be perfect. I just dont know whats all involved like the can bus / trans module, and bolting to engine and and drive shaft.

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Old 12-10-2019, 07:42 AM   #60
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Originally Posted by 86TOYO2k17 View Post
How long/many track days did the ssp clutch pack last? Do you think the heat was more responsible then the power for destroying the clutch packs?

The next big purchase for my build is building the trans. But I really want to swap in a ZF 8HP having 6 close ratio usable gears instead of the 4 capable of handling plenty of power and swapping to a 3.7 FD with 400whp+ would be amazing. Just don’t know what would all be necessary for the ZF swap.
I'm guessing, but I would say about 20 track days. The heat was definitely responsible for both sets of clutch packs failing. I've only overheated the trans twice (idiot light came on) and both times I've had to replace them. Just having 4 usable gears sucks, I've thought about going with 4.88 final drive but that shift from 4th to 5th is terrible. I've also looked into the 3.7 and may end up going this route; with the 3.7 I wouldn't have to shift to 5th on track anymore.
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Old 12-10-2019, 09:57 AM   #61
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I'm guessing, but I would say about 20 track days. The heat was definitely responsible for both sets of clutch packs failing. I've only overheated the trans twice (idiot light came on) and both times I've had to replace them. Just having 4 usable gears sucks, I've thought about going with 4.88 final drive but that shift from 4th to 5th is terrible. I've also looked into the 3.7 and may end up going this route; with the 3.7 I wouldn't have to shift to 5th on track anymore.
Ah ok that's a little more reassuring then.
I had a 4.5 FD on originally from my NA days but after boosting 4th just topped out way too low and 5th was still useless, you would need a 5.1FD to make 5th usable. A 3.7-3.9 could be another good option. but then 4th starts becoming really long. with a 3.73 3rd would get you to about 105mph and then 4th to about 145mph. If you got the power to keep pulling though or really need the longer gearing in the straights could be good.

now a zf hp8 with a 3.73 fd would be money.
with the zf 8hp 70 rated at 516 lb·ft, gearing with a 3.73 fd 7500rpm stock tire diam

1st Gear
31.34

2nd Gear
47.01

3rd Gear
69.94

4th Gear
88.29

5th Gear
114.56

6th Gear
147.15
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Old 12-10-2019, 05:21 PM   #62
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Originally Posted by cdrazic93 View Post
Torque is what breaks things. Not horsepower. HP is a product of torque.

From the nature of this engine, if you have 400 lb ft of tq, you'll have more hp.
550hp @7200rpm
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Old 12-10-2019, 05:29 PM   #63
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I've been using the stock WS but overheated the tans twice (very hot days on track) costing me 2 sets of clutch packs. This time I'm going to add a friction modifier which also reduces temp (according to claims) add a temp gauge, and change fluid more frequently. Also considering switching to Amsoil Signature series or OE; both of which are replacements for WS.
It adds heat anytime it slips. more slip = more heat
A lot of the v8 drag guys have been running john deere hydraulic oil.
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