|Welcome to Ultramax Support
at Ultramax Racing Chassis, we put a tremendous amount of effort
into each and every product we put on the market. However, we
realize that it is not enough to give you the highest quality
product that we can produce...
That is why we are dedicated to making sure that you get the
most out of our product through our technical support programs
and online owners manual area offered on this site.
Owners Manual Page 2:
4 Setting your Ackerman
For this season, Ultramax Racing
Chassis has implemented Ackerman adjustability on our chassis.
The function of Ackerman in front-end geometry is to turn the
inside tire at a higher rate than the outside tire. This is
based on the geometric understanding that the left front tire
is traveling on a tighter arc than the right front tire.
In most cases your desired Ackerman setting will be with the
left front tie-rod end one hole closer to the king pin bolt
than the right front tie-rod end. In unison with the correct
Pitman arm angle, this will give you the correct amount of left
front steering lead for most conditions.
Although this setting will be ideal for most track conditions
you may encounter certain situations that you will benefit from
a change in Ackerman. On a fast, hard biting racetrack, moving
the left front tie-rod end forward another hole may free the
front-end up from the apex to corner exit, allowing for you
to exit the corners lower without binding the chassis or engine
RPMs (picture above). Likewise, on a slower racetrack
that lacks bite, you may find it helpful to move the left front
tie-rod end back a hole to stabilize the chassis on corner entry
to the apex.
As with all adjustments on our chassis, if you are not comfortable
with the adjustments or just like to keep your adjustments simple,
we recommend that you run the settings that we recommended above.
These are settings that will be ideal for all situations and will
not hinder performance under certain track conditions like the other
settings may, if the wrong adjustment is made. Now that we have discussed
Ackerman settings we are ready for step 5, squaring the chassis.
Step 5 Squaring your Chassis
With all of our front-end geometry set we are now ready to square
the chassis. We recommend using the Square-N-Toe by Ultramax Racing
Chassis to ensure the most accurate alignment possible. First, with
the steering locked by the steering pin, we need to remove the right
rear hub and apply the squaring arm to the axle as shown below in
the picture on the left. Next we need to loosen the right front tie-rod
and lengthen or shorten it until the locking arm falls onto the spindle
arm as shown in the middle picture. With the spindle arm in place,
we can now tighten the right front tie-rod. Next, apply the toe plate
to the left front spindle and lock it in place as shown in the picture
on the right. After this is done, check the toe and adjust it to 1/8"
out by lengthening or shortening the left front tie-rod. Then, tighten
This process should be repeated during a race weekend if any changes
in front end geometry are made, or in the case of an accident that
may have slightly bent any front-end components. Once we have the
chassis on the scaling plate and have applied the correct camber settings
we will again adjust the toe to ensure correct alignment. With our
squaring and alignment now finished on your new Ultramax Chassis,
we can move on to the rest of your chassis preparation.
The axle in a chassis is a very important structural component.
It is very important that the axle is secured in the chassis
and that it is in the least amount of bind that is possible.
In order to complete this step, you will need 6 axle locking
collars, lock tight and a set of sprocket guards.
First, remove each set screw one at a time from the axle bearings,
place a drop of lock tight on them and place them back into
the axle bearings tightly. Next, make sure that your brake rotor
is spaced evenly away from each brake pad to ensure free rotation
without drag. Once this is done, make sure the rotor hub is
tightened securely. It is now recommended that you place sprocket
guards on your sprocket hub to ensure that the chain stays in
position even in those tight altercations that we all tend to
get into from time to time on the track.
Finally, we are ready to install the axle collars. One collar should
be placed on both sides of each axle bearing and tightened securely
to assist the set screws in ensuring the axles position in the axle
bearings. Next, set your right rear wheel hub spacing by placing a
10" wheel on the right rear and moving the hub to where the wheel
is a ¼" off of the frame. Once this is done, place an axle
collar just inside the hub and tighten it down securing your hubs
position on the axle. A collar should be placed just inside the left
rear wheel hub to ensure its position on the axle. Its spacing will
be discussed later in the final setting up of the chassis. Once your
axle work is complete, it should look like the picture above. We are
now ready to move on in our chassis preparation.
4 Mounting the Seat
Another very critical step in your chassis preparation is the picking
and mounting of your set. The seat holds the driver and in karting,
the driver is the single biggest piece of ballast and therefore,
the largest portion of weight transfer on the chassis. With this
understanding, it is clear that the type of seat used and its position
on the chassis is very significant in your chassis handling characteristics.
We recommend using a heavyweight seat with a good lip around every
edge. This lip and thickness will prevent a large amount of flex
in the seat and give the chassis the amount of stiffness and stability
that it needs to perform at its optimum level.
We recommend using a heavyweight
seat with a good lip around every edge. This lip and thickness will
prevent a large amount of flex in the seat and give the chassis
the amount of stiffness and stability that it needs to perform at
its optimum level.
Go Page Three...
Go Back to Start
Site Designed & Maintained by
||Contact us with any questions you may have.
by Ultramax Racing 2595 Rutherford Road Greenville, SC 29609
Tel. 864-322-0504 Fax 864-322-0266