Drenth gearboxes - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

edeekeos · 11-28-2014, 10:37 AM

Wow. This is unsettling. What's crawford doing with theirs? Don't they have a 450+ setup?

ATL BRZ · 11-28-2014, 10:44 AM

No one in their right mind should be surprised or unsettled that the gearbox in our cars breaks at the aforementioned power levels. It was made for 200hp and 151tq. Doubling that output is going to break stuff inevitably.

mike the snake · 11-28-2014, 01:39 PM

I bet any of these aftermarket gearboxes can handle quite a bit more that our OEM boxes.

Gearboxes are expensive, that's all there is to it.

I found a couple setups that convert manual shifting to sequential, but these modify the shifting only, the gearboxes are untouched.http://www.tunersgroup.com/TunerWire...equential.html

http://www.sqsracing.com/

Sequential shifting is not realistic for street use, but it is SO totally cool! I'd love to have it because racecar.

Same with single nut wheel hubs.

cdrazic93 · 11-28-2014, 03:49 PM

Has anyone broken the OEM auto trans yet?

mike the snake · 11-28-2014, 03:59 PM

Isn't our gearbox basically the same box that's used in the Honda S2000?

One of those companies sells boxes for the S2000.

Torque ratings for these sequential boxes might not seem as high as we need, but they are built for 100% abuse, so I'm sure they'd hold up a lot better than our OEM boxes.

Decay107 · 11-28-2014, 04:25 PM

Quote:

Originally Posted by mike the snake

Sequential shifting is not realistic for street use.

What makes you say that? Genuinely curious here as I've never felt sequential boxes were inadequate on any of my street driven motorcycles. Are they different when it comes to cars?

Ultramaroon · 11-28-2014, 04:59 PM

Quote:

Originally Posted by mike the snake

Isn't our gearbox basically the same box that's used in the Honda S2000?

I don't think so. I stumbled upon this article a while back.

mike the snake · 11-28-2014, 05:01 PM

Mainly cost, and that I've read they need servicing around every 3000 miles.

I've wondered the same thing, our motorcycle boxes go forever and are sequential dog boxes.

I'd LOVE to have a sequential street gearbox in my car.

Quote:

Originally Posted by Decay107

What makes you say that? Genuinely curious here as I've never felt sequential boxes were inadequate on any of my street driven motorcycles. Are they different when it comes to cars?

Ultramaroon · 11-28-2014, 05:27 PM

Quote:

Originally Posted by mike the snake

Mainly cost, and that I've read they need servicing around every 3000 miles.

I've wondered the same thing, our motorcycle boxes go forever and are sequential dog boxes.

I'd LOVE to have a sequential street gearbox in my car.

I've been wondering exactly the same thing and this just occurred to me - maybe we don't have to service our motorcycle gearboxes because they share oil with the engine. Other than swapping oil, do the automotive sequential boxes require anything else?

Do Harley people have to service their gearboxes? I'm a straight-4 guy.

Reaper · 11-28-2014, 07:13 PM

Dog engagement just plain wears out.

Ultramaroon · 11-28-2014, 07:24 PM

Quote:

Originally Posted by Reaper

Dog engagement just plain wears out.

which ones?

themadscientist · 11-28-2014, 07:29 PM

Yeah, syncros are bulletproof.

xwd · 11-28-2014, 08:52 PM

Quote:

Originally Posted by Ultramaroon

which ones?

All of them. The dog rings wear over time just like synchros do but may be much worse based on how you shift the car.

Elite Racing has a good sequential box for the Impreza that handles quite a bit of torque, but it's $12k+.

Ultramaroon · 11-28-2014, 09:15 PM

Got it. Thx. I wasn't sure whether reaper was referring to automotive, or Harley gearboxes.

Even more now, what's so special about motorcycle gearboxes? Why don't they crap out? Aren't they essentially the same thing?

*sets off to google, fully prepared to realize it was a stupid question*

11-28-2014, 10:44 AM	#16
ATL BRZ TEQSPORT Brand Manager Join Date: Jun 2012 Drives: '24 GR86 + '16 FR-S Location: Atlanta Posts: 3,666 Thanks: 3,725 Thanked 4,137 Times in 1,707 Posts Mentioned: 90 Post(s) Tagged: 6 Thread(s)	No one in their right mind should be surprised or unsettled that the gearbox in our cars breaks at the aforementioned power levels. It was made for 200hp and 151tq. Doubling that output is going to break stuff inevitably. __________________ ________________________________Toyota \| Lexus Parts & Performance Specialists__________________________________

11-28-2014, 03:49 PM	#18
cdrazic93 Junior Join Date: Aug 2013 Drives: a car Location: Probably at school Posts: 4,341 Thanks: 3,184 Thanked 2,512 Times in 1,502 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	Has anyone broken the OEM auto trans yet? __________________ "Ah! What music! They could have never imagined, those pioneers who invented the automobile, that it would posses us like this, our imaginations, our dreams. Men love women, but even more than that, men love CARS!"-Lord Hesketh

11-28-2014, 07:13 PM	#24
Reaper in orbe terrum non visi Join Date: Jan 2014 Drives: violent Location: Mountains Posts: 1,747 Thanks: 279 Thanked 762 Times in 446 Posts Mentioned: 62 Post(s) Tagged: 1 Thread(s)	Dog engagement just plain wears out. __________________ I have E85 where there isn't E85, that's my secret. http://www.ft86club.com/forums/showt...t=reaper+build

11-28-2014, 09:15 PM	#28
Ultramaroon not playing cards Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 32,395 Thanks: 53,053 Thanked 37,228 Times in 19,308 Posts Mentioned: 1118 Post(s) Tagged: 9 Thread(s)	Got it. Thx. I wasn't sure whether reaper was referring to automotive, or Harley gearboxes. Even more now, what's so special about motorcycle gearboxes? Why don't they crap out? Aren't they essentially the same thing? sets off to google, fully prepared to realize it was a stupid question __________________ service manuals

11-28-2014, 01:39 PM	#17
mike the snake Senior Member Join Date: Jul 2013 Drives: 2013 BRZ Location: Norcal Posts: 1,592 Thanks: 1 Thanked 623 Times in 378 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	I bet any of these aftermarket gearboxes can handle quite a bit more that our OEM boxes. Gearboxes are expensive, that's all there is to it. I found a couple setups that convert manual shifting to sequential, but these modify the shifting only, the gearboxes are untouched.http://www.tunersgroup.com/TunerWire...equential.html http://www.sqsracing.com/ Sequential shifting is not realistic for street use, but it is SO totally cool! I'd love to have it because racecar. Same with single nut wheel hubs.

11-28-2014, 03:59 PM	#19
mike the snake Senior Member Join Date: Jul 2013 Drives: 2013 BRZ Location: Norcal Posts: 1,592 Thanks: 1 Thanked 623 Times in 378 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	Isn't our gearbox basically the same box that's used in the Honda S2000? One of those companies sells boxes for the S2000. Torque ratings for these sequential boxes might not seem as high as we need, but they are built for 100% abuse, so I'm sure they'd hold up a lot better than our OEM boxes.

11-28-2014, 07:29 PM	#26
themadscientist Hotlink Terrorist Join Date: Nov 2014 Drives: 2015 WRB BRZ Spec S Location: "Dirty South" Japan Posts: 2,077 Thanks: 1,525 Thanked 2,624 Times in 1,196 Posts Mentioned: 12 Post(s) Tagged: 0 Thread(s)	Yeah, syncros are bulletproof.

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