[Fot] LSD

[Stutzmans]

Years ago I modified the rear springs of my TR4 as outlined by Carroll Smith 
in TUNE TO WIN page 157.  It really works well.  I removed the track rods 
that were problematic.  I turned the front half of the springs into trailing 
arms by tightly clamping the leaves together which located the axle.  The 
back half of the spring does the springing.  First, however, I installed the 
late TR4 springs that are longer behind the axle.  Works well!
Bruce
.


----- Original Message ----- 
From: "J.C. Hassall" <jhassall at blacksburg.net>
To: "MadMarx" <tr4racing at googlemail.com>
Cc: <fot at autox.team.net>
Sent: Saturday, June 02, 2012 2:47 PM
Subject: Re: [Fot] LSD


> On 6/2/2012 2:04 PM, MadMarx wrote:
>> I used an idea from a engineering book but I suppose that the angle of 
>> the
>> rod is too large.
>> I drove into a McDonald parking when the left rod snapped.
>> With one working rod the on-off-throttle steer was back again...greatly 
>> more
>> than it was but the car felt much better.
>> So I'm going back to the stock situation and remove the rods.
>>
>> Cheers
>> Chris
>> And thank you all for input. Learned a lot.
>>
>>
>>
> Chris, as I recall from my old DP car with a Detroit Locker differential; 
> the car would squat to one side or the other under 
> acceleration/deceleration; after I installed a set of torque rods the 
> problem went away.  It is important to have the axis of the rod parallel 
> to the frame when the car is at half suspension travel.  That should 
> minimize surprises as the suspension hits the limits, as Duncan said 
> below.  By the way, it appeared from your video that the rods were welded 
> to the top of the axle.  Mine were mounted to a plate under the spring 
> pad; the front of the rods mounted to a bracket I welded to the frame.
>
> I have some pictures of a Traction Master rod like I had installed which I 
> can send if you want them.
>
> Gluck auf!
>
> jim
>> -----Urspr|ngliche Nachricht-----
>> Von: Duncan Charlton [mailto:duncan.charlton54 at gmail.com]
>> Gesendet: Samstag, 2. Juni 2012 19:38
>> An: MadMarx
>> Betreff: Re: [Fot] LSD
>>
>> Chris,
>>
>> Does the rod's arc of movement exactly match that of the axle?  That is,
>> does the front mount of the reaction rod use the same axis of rotation as
>> the front eye of the spring?  If not, it's trying to twist the axle 
>> relative
>> to what the spring is doing, creating resistance to movement, adding roll
>> stiffness.
>>
>> Another approach might be to clamp together the front leaves of the 
>> spring
>> but leave the rears alone.  One other solution I've seen (on a Sunbeam
>> Tiger) was to wrap the front end of the second leaf around the spring eye
>> bushing (inside the main leaf eye, and using a smaller-diameter bushing),
>> effectively doubling the stiffness of the front half of the spring.
>>
>> Duncan
>> (Texas)
>>
>> On Jun 2, 2012, at 12:08 PM, MadMarx wrote:
>>
>>
>>> Hi Guys,
>>>
>>> I installed rods to the axle.
>>>
>>> http://youtu.be/QPCCN96x8_U
>>>
>>>
>>> The leaf spring is now calmated but the car does oversteer badly.
>>> Seems to stiffen up the suspension now.
>>> I'm not sure if I should maintain that idea.
>>>
>>> Cheers
>>> Chris
>>
>
>
> -- 
> Jim Hassall
> Blacksburg VA
> '63 TR4 in autox preparation
> 99% finished, 90% to go
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