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In a message dated 5/5/00 7:16:57 PM Pacific Daylight Time, CarterCM writes:
<< you get underwater when initiating a turn >> s/b understeer!
Sorry, no, Gordon wasn't talking about a submarine (damn auto spellchecker).
Craig
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From: CarterCM@aol.com
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Date: Fri, 5 May 2000 22:16:57 EDT
Subject: Fwd: Understeering a-rama
To: datsun-roadsters@autox.team.net
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In a message dated 5/5/00 6:29:40 PM Pacific Daylight Time, glasgow@serv.net
writes:
<< What's probably happening is that the LSD is set on the tight side? When
that happens, you get underwater when initiating a turn, particularly at low
speed. >>
Right...plus the LSD friction disks get glazed and "grabby" over time and
with lower speed driving, making it worse. Try "conditioning" the LSD by
going to parking lot. Stop and crank wheel hard left and hold it. Drive in a
tight circle for 10-15 revolutions @ slow speed. Repeat for right turn. LSD
should be working better.
Craig Carter
Fountain Valley, CA
1970 SRL-311#-14100
1968 SRL DP Racecars
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Date: Fri, 05 May 2000 18:35:47 -0700
From: Gordon Glasgow <glasgow@serv.net>
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To: datsun-roadsters@autox.team.net
Subject: Re: Understeering a-rama
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Reply-To: Gordon Glasgow <glasgow@serv.net>
It probably has nothing to do with the bump stops. They would only come into
play if you were
already in a turn and had major lateral G's going, to the point where the body
roll allowed the
frame and bump stops to meet.
What's probably happening is that the LSD is set on the tight side. When that
happens, you get
understeer when initiating a turn, particularly at low speed. Try this test.
Find a flat parking lot
someplace, put the car in neutral with the handbrake off, turn the steering
wheel a goodly ways
over, and try to push the car by hand. If it feels like the handbrake is still
set, that's the LSD.
About the only way to do a donut with that setup is to start the turn slowly,
stuff in the clutch,
bring up the revs and dump the clutch. You should get a pretty good snap-spin.
Not recommended for
parts longevity, though. Ring and pinions and LSD's are pretty spendy items.
Better leave that stuff
to the CART guys.
Daniel Neuman wrote:
> Hello All,
> I forgot to tell you guys that the other night when I was
> in the rather questionable part of town I tried to do a couple of
> donuts in a big fourway intersection(at night in an'industrial' neighborhood
> with no-one else around for miles). I could not do it?? The car was under
> steering so badly that it couldn't stay in the intersection.. I almost
> hit a curb.
> Now Iknwo that it understeers because I have the 4.11LSD and I
> cut the rear bumpstops down to the improved street version (from Bob
> Sharps manual) but have not yet touched the front bumpstops.. Should I
> go with the improved street profile or jsut go with the racing
> 'to increase oversteer' profile?? Or should I jsut do one and if it
> still oversteers just go withthe more radical racing profile??
>
> Daniel 69 2000
> SF CA
>
--
Gordon Glasgow
http://www.gordon-glasgow.org
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