Rear end

Jax Grafx S2K · 11-20-2007, 04:59 PM

Why is the differential a weak point. Is it the gear or what that makes it weak?

Java Junky · 11-20-2007, 05:21 PM

In-breedin'.

gomarlins3 · 11-21-2007, 08:55 AM

Because it is designed by another company for cars with less HP. There is flexing that goes on in the housing I believe and this allows the gears to move slightly apart. The torque generated (as little as it is) will cause the ring to slip past the gear and the grinding occurs. This is just my theory, I do not have actual proof in my hands.

Kalm_Traveler · 11-21-2007, 01:05 PM

Quote:

Originally Posted by gomarlins3

Because it is designed by another company for cars with less HP. There is flexing that goes on in the housing I believe and this allows the gears to move slightly apart. The torque generated (as little as it is) will cause the ring to slip past the gear and the grinding occurs. This is just my theory, I do not have actual proof in my hands.

All the research I did supports this to the T. The case gets ripped apart because the differential itself shimmies around inside - thus putting stress on the case sideways rather than the way it was designed to hold things.

jagg · 11-21-2007, 01:54 PM

Jagg's theory,

Many auto manufacturers do not build or design their own rear diff assemblies, yet it's rarely a failure related to application or design.
typically, fluid loss due to lack of proper maintainence is the reason for a differential's failure..
Go is correct that the rear is designed for less powerful applications,
but they're not really producing any less torque than what stewie has.

I believe that the rears are designed with too little backlash for a car with such a sportscar drivetrain. (personally, I"ve never seen a rear end with less backlash built into it than on an S2000)
They attempt to elilminate this issue via the dampening design of the driveshaft, and also up front at the clutch (i.e. clutch delay valve)....but for the really hard drivers, it's not enough.There's nowhere for the power to go before the ring and pinion are fully loaded, and wham! she snaps.
I understand why they use this weight and size saving design....but most beneficial things under a car have a drawback somewhere.
Bottom line, Stewie ain't got enough slop through the drivetrain, and sometimes under harsher circumstances, something's got to give.

just my opinion,
regards,
jagg

Java Junky · 11-21-2007, 02:04 PM

'Pretty damned "jus' the facts m'am" opinion Jagg.
So, as usual, everybody'z aware'a this brand "X" manufacturer producin' Stewies rear . . except me. So I godda ask: Who makes Stewie's rear n' was it intended for a specific car 'r jus' put on a shelf for universally fittin' whatever came along?
Be well all,
Java

MarkZ28 · 11-21-2007, 02:14 PM

Datsun used to use Fuji heavy industry rears and Subaru is now using the same rear ends, has been for a while to. I know its not the same company that makes the Miata's rear since I just changed fluids in both today.

11-20-2007, 04:59 PM	#1 (permalink)
Jax Grafx S2K Junior Member Join Date: Jul 2007 Posts: 18	Rear end Why is the differential a weak point. Is it the gear or what that makes it weak?

11-20-2007, 05:21 PM	#2 (permalink)
Java Junky Resident Curmudgeon Join Date: Jun 2005 Location: Joisey Posts: 5,432	In-breedin'. __________________ In life-long pursuit of that most mythic of beasts: the ever-elusive perfect corner. Well . . . that, r' at least a whole lodda clear spin-out room.

11-21-2007, 08:55 AM	#3 (permalink)
gomarlins3 "Enjoy the drive" Join Date: Jul 2005 Location: Kuna Idaho Posts: 2,811	Because it is designed by another company for cars with less HP. There is flexing that goes on in the housing I believe and this allows the gears to move slightly apart. The torque generated (as little as it is) will cause the ring to slip past the gear and the grinding occurs. This is just my theory, I do not have actual proof in my hands. __________________ Yablownowitz Racing brought to you by Anytime Fitness. Happiness is a nice road, great weather, and driving the S with Sue in the seat next to me. "Whatever you do, where ever you go, enjoy the drive." I know for a FACT that the last year of production of the S2000 is 2003!!!!! After that, it will be the S2200 under an assumed name.

11-21-2007, 02:04 PM	#6 (permalink)
Java Junky Resident Curmudgeon Join Date: Jun 2005 Location: Joisey Posts: 5,432	'Pretty damned "jus' the facts m'am" opinion Jagg. So, as usual, everybody'z aware'a this brand "X" manufacturer producin' Stewies rear . . except me. So I godda ask: Who makes Stewie's rear n' was it intended for a specific car 'r jus' put on a shelf for universally fittin' whatever came along? Be well all, Java __________________ In life-long pursuit of that most mythic of beasts: the ever-elusive perfect corner. Well . . . that, r' at least a whole lodda clear spin-out room.

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11-21-2007, 01:54 PM	#5 (permalink)
jagg Senior Member Join Date: Sep 2007 Location: The Endless Mountains Posts: 2,520	Jagg's theory, Many auto manufacturers do not build or design their own rear diff assemblies, yet it's rarely a failure related to application or design. typically, fluid loss due to lack of proper maintainence is the reason for a differential's failure.. Go is correct that the rear is designed for less powerful applications, but they're not really producing any less torque than what stewie has. I believe that the rears are designed with too little backlash for a car with such a sportscar drivetrain. (personally, I"ve never seen a rear end with less backlash built into it than on an S2000) They attempt to elilminate this issue via the dampening design of the driveshaft, and also up front at the clutch (i.e. clutch delay valve)....but for the really hard drivers, it's not enough.There's nowhere for the power to go before the ring and pinion are fully loaded, and wham! she snaps. I understand why they use this weight and size saving design....but most beneficial things under a car have a drawback somewhere. Bottom line, Stewie ain't got enough slop through the drivetrain, and sometimes under harsher circumstances, something's got to give. just my opinion, regards, jagg

11-21-2007, 02:14 PM	#7 (permalink)
MarkZ28 Senior Member Join Date: Oct 2007 Posts: 123	Datsun used to use Fuji heavy industry rears and Subaru is now using the same rear ends, has been for a while to. I know its not the same company that makes the Miata's rear since I just changed fluids in both today.