Rear axle options for small RWD

Hell, Demon-Tweeks also has fiberglass arches and they are known to ship to the US no problem. So that problem is sorted (aside from money of course).





New problem: I want to locker all the things now.

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Pete Remner
Cleveland, Ohio

1984 RX-7 (rallycross thing)
1978
Silence is golden, but duct tape is silver.

i kinda wish i went Ford 8.8 for my rear axle in the Rx7 instead of the toyota 8"

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First Rally: 2010 First RallyX: 2004 (a bunch)
Driver (0), Co-Driver (7)
Organizer (3), Volunteer (3)
Cars Built (2.5), Engines Blown (2) Cages Built (0) # of rotations (3.5)
Last Updated, Apr 9, 2023

The 8.8 IRS in my friend's Exploder has howled like mad since nearly new. Replace all bearings, check lash, etc., and it gets quiet for 20k miles, then howls again. POS.

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Andrew Steere
Lyndeborough, NH
KB1PJY

Quote
Gravity Fed
i kinda wish i went Ford 8.8 for my rear axle in the Rx7 instead of the toyota 8"

No you don't. You just think you do..

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John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
CALL +1 206 431-9696
Remember! Pacific Standard Time
is 3 hours behind Eastern Standard Time.

well now i have to redrill rotors for the front and use a spacer for the rotor to have the right brakes, then the rear has a wonkly combo of parts to make something that looks like disc brakes, which currently i have more rear braking piston area than front (i want to redo the rear brakes eventually).

---

First Rally: 2010 First RallyX: 2004 (a bunch)
Driver (0), Co-Driver (7)
Organizer (3), Volunteer (3)
Cars Built (2.5), Engines Blown (2) Cages Built (0) # of rotations (3.5)
Last Updated, Apr 9, 2023

The grass is always greener on the other side of the fence.

On the other hand, the grass is greener if you water it.

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Pete Remner
Cleveland, Ohio

1984 RX-7 (rallycross thing)
1978
Silence is golden, but duct tape is silver.

9" grass?

---

First Rally: 2010 First RallyX: 2004 (a bunch)
Driver (0), Co-Driver (7)
Organizer (3), Volunteer (3)
Cars Built (2.5), Engines Blown (2) Cages Built (0) # of rotations (3.5)
Last Updated, Apr 9, 2023

Quote
john vanlandingham

Quote
Gravity Fed
i kinda wish i went Ford 8.8 for my rear axle in the Rx7 instead of the toyota 8"

No you don't. You just think you do..

What's wrong with the 8.8?

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Self-righteous douche canoe

Quote
hoche

Quote
john vanlandingham

Quote
Gravity Fed
i kinda wish i went Ford 8.8 for my rear axle in the Rx7 instead of the toyota 8"

No you don't. You just think you do..

What's wrong with the 8.8?

Bigger, heavier by a good deal..
And a shitty 2 pinion design..

Diffs you gonna beat on you want 4 pinion/planets..You want some plates and more lock-up..
And you don't want or need something that big and did I mention HEAVY


( I am making the increasingly foolish assumption that the subject is about a RALLY car and not a theoretical or idealized imaginary car)

---

John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
CALL +1 206 431-9696
Remember! Pacific Standard Time
is 3 hours behind Eastern Standard Time.

Best part about the Toyota 8"...cheap available parts, PLUS easy setup.

Front loader with threaded side bearing cups means fast setup time. And gear ratios can be swapped rapidly if you buy another center chuck/LSD/gear set. About 20 minutes.

It is much lighter than an 8.8 too.

---

Opel is a 4-letter word...
http://www.flickr.com/photos/10498579@N07/sets/

Quote
john vanlandingham

Quote
hoche

Quote
john vanlandingham

Quote
Gravity Fed
i kinda wish i went Ford 8.8 for my rear axle in the Rx7 instead of the toyota 8"

No you don't. You just think you do..

What's wrong with the 8.8?

Bigger, heavier by a good deal..
And a shitty 2 pinion design..

Diffs you gonna beat on you want 4 pinion/planets..You want some plates and more lock-up..
And you don't want or need something that big and did I mention HEAVY


( I am making the increasingly foolish assumption that the subject is about a RALLY car and not a theoretical or idealized imaginary car)

The nice thing about the 8.8 is that it uses the same axle spline counts/diameters as the Ford 9", so if you wanted, you could put 9" bearing ends on the 8.8 so as to eliminate the C-clips, and then you can run any diff you wanted.

On the other hand, you're pretty much limited to spools, lockers, shit limited slips, or Torsens, since I don't think anybody ever geared up for the "real clutch type diff for pervs who put retained bearing ends or better yet floater ends on a Ford 8.8 rear". Because people who have a choice and need a rearend that big just go straight for the 9". People run the 8.8 because they have to, not because they want to. (Admittedly, it IS a lot lighter than a 9", if you're using iron parts. On another forum when I mentioned that my all-up 9' rear was about 180-190lb, I was asked how the fuck did I get a 9" that LIGHT....)

There's a company that makes pumpkins that plug into a 9" rearend but use Chevy 12-bolt guts, which are almost as strong but have a lot less frictional loss since the pinion is a lot closer to axle centerline. Worth a tenth or two on a drag car. Relevance here: Zero. But interesting nonetheless.

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Pete Remner
Cleveland, Ohio

1984 RX-7 (rallycross thing)
1978
Silence is golden, but duct tape is silver.



Edited 1 time(s). Last edit at 05/14/2018 09:19PM by Pete.

aaaaaaand the 9" lasted six runs before I blew it up.

It wasn't so bad I can't make it home but clearly there are Unhappy Things in the diff.

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Pete Remner
Cleveland, Ohio

1984 RX-7 (rallycross thing)
1978
Silence is golden, but duct tape is silver.

Quote
john vanlandingham

Bigger, heavier by a good deal..
And a shitty 2 pinion design..

Diffs you gonna beat on you want 4 pinion/planets..You want some plates and more lock-up..
And you don't want or need something that big and did I mention HEAVY


( I am making the increasingly foolish assumption that the subject is about a RALLY car and not a theoretical or idealized imaginary car)

Yeah, I feel like we are saying the same shit over and over again.

You know, things like : CHECK YOUR FUCKING EMAILS NOW!!!!!!!

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Ask for work.
If they don't give you work, ask for bread.
If they do not give you work or bread, then take bread.

- Emma Goldman

Quote
Vincent Gagnon

Quote
john vanlandingham

Bigger, heavier by a good deal..
And a shitty 2 pinion design..

Diffs you gonna beat on you want 4 pinion/planets..You want some plates and more lock-up..
And you don't want or need something that big and did I mention HEAVY


( I am making the increasingly foolish assumption that the subject is about a RALLY car and not a theoretical or idealized imaginary car)

Yeah, I feel like we are saying the same shit over and over again.

You know, things like : CHECK YOUR FUCKING EMAILS NOW!!!!!!!

Didya get the tracking number?

---

John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
CALL +1 206 431-9696
Remember! Pacific Standard Time
is 3 hours behind Eastern Standard Time.