Hi Keith and Terry,
When you decide to run a spool, you also decide to weight the car properly.
Keith talked about stagger...well he is right on target. The real trick is
to get the weight right at speed. Aero loading is just as important as
static loading, as it can push down on a corner of the car that you did not
expect. Torque is also a factor. Lots of stuff to consider. No problem for
my car, as it turned out, but it sure can be for cars that were not
designed to run 200 MPH+. Anyway...a spool is the best way to go for max
traction.....weight the car......drive carefully until you learn how it
handles and maybe adjust the aerodynamics....spoilers, fences, etc. I think
you're right on track with the throttle ratio/position adjustment. I'd be
careful, though, with gear ratio changes on the dirt to fix handling. Could
make the problem worse. But maybe an expert on dirt will chime in?
Hang in there...it'll work.
Skip
At 05:09 AM 10/13/01 -0500, you wrote:
>This is my story about traction, speed, ballast, spoiler,spool, and stagger.
>
>We have almost always been capable of spinning the tires at about any speed
>on the salt.... at Maxton we have spun the tires running 180mph and Muroc
>was a skating ring posing as a race course... up to 196mph...
>
>So I can honestly say I have lost traction bout everyway you can lose it...
>Obviously we had the same kinda handling problems at Bonneville this
>year.... BUT I have never until this year had the car do anything but go
>straight as an arrow while it was spinning the tires.... and I run a spool.
>We are fixing to hear from the world about how a Spool isn't the way to
>go.... BUT I have to work within the limits of my experience... and until
>this year where I had a Major Stagger problem with the tires... and a
>preload in the rear end due to Springs being different sizes... My car has
>always gone straight ....
>
>To fix my Problem at Muroc we installed 100lbs of ballast in the rear of the
>car.... added a ton of spoiler and Low and behold... the car hooked up and
>hauled butt..... went from a 196 to the 205mph....
>
>Some folks are going to say to run an open rear end... as it's basically a
>spool once your up to speed anyway.... others are going to say to run some
>kinda posi unit.... Still others are going to lament the benifets of the
>locker.... Hell I don't know.... I only know what has worked in the past for
>me....
>
>Keith
>----- Original Message -----
>From: "Rose & Terry Hunt" <hunt@Kuentos.guam.net>
>To: "land-speed@autox.team.ne" <land-speed@autox.team.net>
>Sent: Saturday, October 13, 2001 5:07 AM
>Subject: Oct./El Mirage
>
>
>> Hello list, Rose and I just returned from the mainland last night. Seven
>hours
>> later we experienced a 7.0 earthquake. No damage at home but the power's
>still
>> out a day later. We get a lot of these,. More than in Calif. We enjoyed
>the
>> Gas Up and El Mirage. It was the first time I had made other than a
>licensing
>> run. It's MUCH harder going fast on dirt. I broke traction in all gears.
>In
>> 3rd the car got to cycling right and left. Finally I decided to pedal
>before I
>> spun the car. I gathered it up and went a disappointing 170 mph. I've
>decided
>> that more ballast, increased spoiler angle, and a higher gear (3.40 vs.
>3.70)
>> are things I'll try next time. I've always run a spool in the Franklin QC.
>> Also, I intend to change my throttle pedal ratio and position to make it
>more
>> comfortable. I need to have better control over the new F/I motor. It
>makes
>> very good power and the throttle response is WAY quicker than last years
>> carbureted set up. Your input on this handling problem would be
>appreciated.
>> Terry Hunt, Guam Bomb, #743
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