RE: diff question

Sun, 13 Mar 2005 18:11:31 -0800

Title: Message
Mark,
Fitting adjustable height bump stop elastomer pads to limit travel. When the elastomer pad comes up against a bracket (supported from the body) the elastomer stops the arm from travelling further. Raising and lowering the pad adjusts the total amount of travel. You can also do it by fitting bump stops in shockers but they are less rugged.
 
R31 IRS shafts are fine as well.
 
Cheers
Feral Errol
www.datrats.com.au
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mark O'Connor
Sent: Monday, March 14, 2005 12:11 PM
To: [email protected]
Subject: RE: diff question

Cheers Errol,
 
That tends to make sense. Although not sure what you mean by limiting control arm travel.
 
You suggest 280ZX shafts - are they better than the R31 skyline shafts?
 
Mark
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Errol Smith
Sent: Monday, 14 March 2005 11:12 AM
To: [email protected]
Subject: RE: diff question

Of the two diff types, I would go for an LSD (if cost is no option) as the LSD is a little easier on drive shafts.
 
As Jeff said, beam axles are a lot easier to setup for drag use.
 
With IRS, you can still get a good result if you use low rate (around 600 lb) rear springs so you get rear weight transfer to get of the line. The problem with using lower rate springs is that as the suspension squats during weight transfer, you get camber change that reduces the tyre contact surface and increases stress on universal joints in drive shafts with the large drive direction change.
 
One way to solve the camber change problem is to limit control arm travel with adjustable rising rate elastomer spring bump stops. I am doing this on my coupe rear arms. To solve the uni type drive shaft problems and generally improve the rear drive train performance, I am having R30 drive shafts modified to suit the R180. If you are using an R200 use 280ZX shafts. The CV shafts dont break and power losses are minimal through larger angle changes.
 
Cheers
Feral Errol
www.datrats.com.au
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jeff
Sent: Monday, March 14, 2005 10:22 AM
To: [email protected]
Subject: RE: diff question

How about not having IRS for a start !
IRS is notorious for having traction problems with high HP engines.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On Behalf Of Mark O'Connor
Sent: Monday, March 14, 2005 8:18 AM
To: [email protected]
Subject: diff question

Can anyone tell me - in drag racing are you better off with an LSD or locker diff in a 1600?
 
 
 
MARK OCONNOR

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