Jack,
I am currently running 585 lbs/in in the rear and 385 lbs/in in the
front. Stock geometry, 2 1/2 degrees neg camber in the front, 1 1/2
degrees neg camber in the rear, a 1" front bar and a 7/8" rear bar.
Spax shocks in the front and the stock lever arms in the back. The car
is very neutral and turns in nicely however, it seems that I'm lifting
the rear inside wheel too much when I see photos of the car in tight
corners. There still seems to be too much body roll. I assume that it
is the springs. I'll be adding additional rate this year to the springs
in hopes of reducing lift. I plan to go to 600 lbs/in rear and at least
450 lbs/in or more in the front. I know that a certain amount of body
roll helps the car turn in so I want to find a balance between this and
understeer. I know that the guys in England run high spring rates all
around (600). When I talked to Kas about this he seemed to remember
that they were running rear rates close to 700 lbs. Of course, tires
were different then.
I would be curious to know what others are running?
Allen
On Feb 2, 2008, at 1:44 PM, Jack W. Drews wrote:
> Good advice from Ted.
>
> I failed to mention that I had help on this project from Ted
> Schumacher. He identified springs he had in stock that could be
> modified to approach my specifications. Low price, quick delivery,
> good quality. Try Ted first.
>
> I purchased a set, modified and installed them. I have had a chance
> to test them only on a limited basis because the test weekend was cut
> short by other problems, but my initial reaction is that the car is
> responding positively to stiffer springs. They are in the car at the
> minute. I think it's going to be fun to do the comparison.
>
> I went on to purchase a set of springs from Revington because they
> were closer to the rate that I was shooting for. I don't know if the
> car will handle any better with them. I'll have to wait until I have
> a chance to try them. So if you are looking for a somewhat higher
> rate than the popularly used MGB-GT springs, Ted's are some to
> consider.
>
> Of course this raises a point that may provide fodder for discussions
> well into Springtime -- how stiff should the springs in a TR4 be? I
> know of springs in current race cars that are stock, springs that are
> 480 or so (MGBGT) and springs that are 600 lbs/in. Some folks say we
> should use relatively soft springs and let the suspension do its job
> -- but with the abominable front end geometry we have, one could
> question why we would want the front end to move at all from static.
> In addition, all the modern tracks we run on are as smooth as glass
> (except Grattan, of course) so we're no longer looking at dealing with
> bumps.
>
> There are lots of formulae around to help select spring stiffness.
> I've never been smart enough to bring one of those engineering
> approaches to completion, so decided to try some things and see what
> feels best to my hind end.
>
>
>
>
>>> Jack, when you receiove the springs, do a rate check. See how
>> accurate they are. Ted
>
> uncle jack
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Jody & Allen Washatko
N65 W5567 Columbia Road
Cedarburg, WI. 53012
USA
tel. (262) 375-6888
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