Differential Strength Component - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

slicktop · 10-12-2013, 02:20 AM

So maybe I'm not using the right terminology but I'm just looking for clarification.

Our rear end is a weak point. I'm trying to decide on the best route for upgrades. Looking at 800whp+. The routes currently are the FullBlown 8.8 Ford rear end conversion or upgraded axles/gears in the diff.

My question is, the axles and gearset are the strength of the rear end, correct? The differential casing is just a protective housing... mostly. Is that an accurate statement?

Suberman · 10-12-2013, 10:38 AM

Not at the power levels you're describing.

All that torque is transferred to the wheels by reaction against the diff housing. One significant advantage to IRS is being able to bolt that diff firmly to the chassis. Live axles bend and twist and jump around under all that torque.

One of the biggest issues with carbon fibre transmission cases developed for F1 was engineering the structure so it would not twist and pop the bearings.

The diff case is a very specialized casting designed to hold all the bearings and seals precisely aligned while that torque is directed at 90 degrees.

JerryMichaels7 · 10-12-2013, 10:47 AM

I have yet to hear of a diff actually going pop...axles yes diff no. upgrade the axles and be done...only plus to going with the 8.8 is ALOT of gear ratios are out there already.

boredom.is.me · 10-12-2013, 11:41 AM

Why the hell do you need 800+whp?

Dipstik-sportech · 10-12-2013, 12:53 PM

Quote:

Originally Posted by boredom.is.me

Why the hell do you need 800+whp?

Because racecar. Duh

slicktop · 10-12-2013, 04:55 PM

Quote:

Originally Posted by boredom.is.me

Why the hell do you need 800+whp?

I need 800whp so I can autox around the track faster.

slicktop · 10-12-2013, 04:57 PM

Quote:

Originally Posted by Suberman

Not at the power levels you're describing.

All that torque is transferred to the wheels by reaction against the diff housing. One significant advantage to IRS is being able to bolt that diff firmly to the chassis. Live axles bend and twist and jump around under all that torque.

One of the biggest issues with carbon fibre transmission cases developed for F1 was engineering the structure so it would not twist and pop the bearings.

The diff case is a very specialized casting designed to hold all the bearings and seals precisely aligned while that torque is directed at 90 degrees.

Makes perfect sense. Thank you for the reply!

mike the snake · 10-12-2013, 05:10 PM

I'm curious about the Ford 8.8 rear end. Is it an independent setup, or straight axle?

slicktop · 10-13-2013, 07:50 AM

Quote:

Originally Posted by mike the snake

I'm curious about the Ford 8.8 rear end. Is it an independent setup, or straight axle?

Independent. Cost is around 5k.

http://www.ft86club.com/forums/showthread.php?t=31474

10-12-2013, 02:20 AM	#1
slicktop Senior Member Join Date: Mar 2013 Drives: 2013 Raven FRS 2JZ-GTE/V160 swapped Location: Hampton, VA Posts: 960 Thanks: 376 Thanked 623 Times in 315 Posts Mentioned: 18 Post(s) Tagged: 0 Thread(s)	Differential Strength Component So maybe I'm not using the right terminology but I'm just looking for clarification. Our rear end is a weak point. I'm trying to decide on the best route for upgrades. Looking at 800whp+. The routes currently are the FullBlown 8.8 Ford rear end conversion or upgraded axles/gears in the diff. My question is, the axles and gearset are the strength of the rear end, correct? The differential casing is just a protective housing... mostly. Is that an accurate statement?

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10-12-2013, 10:38 AM	#2
Suberman Banned Join Date: Jul 2013 Drives: Subaru BRZ Sport Tech Satin White Location: Calgary, Alberta,Canada Posts: 1,228 Thanks: 147 Thanked 320 Times in 225 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Not at the power levels you're describing. All that torque is transferred to the wheels by reaction against the diff housing. One significant advantage to IRS is being able to bolt that diff firmly to the chassis. Live axles bend and twist and jump around under all that torque. One of the biggest issues with carbon fibre transmission cases developed for F1 was engineering the structure so it would not twist and pop the bearings. The diff case is a very specialized casting designed to hold all the bearings and seals precisely aligned while that torque is directed at 90 degrees.

10-12-2013, 10:47 AM	#3
JerryMichaels7 Senior Member Join Date: Mar 2013 Drives: Whiteout FRS Location: South, Ga Posts: 348 Thanks: 19 Thanked 144 Times in 80 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I have yet to hear of a diff actually going pop...axles yes diff no. upgrade the axles and be done...only plus to going with the 8.8 is ALOT of gear ratios are out there already.

10-12-2013, 05:10 PM	#8
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'm curious about the Ford 8.8 rear end. Is it an independent setup, or straight axle?

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