Page 40 - Longacre 2017 Catalog

A Totally NEW Kind Of Tire

Pressure Gauge

Setting The Most
Tire Pressure/ Accurate Tire Pressures:
Pyrometer
Combined If tire pressures are critical to your car's
performance – closer than +/- 1 psi – then you
really need what this gauge can do for you.
Pressures must be set in the pits but the tires
sitting there can easily vary by as much as
20°. You are setting on-track hot pressures
Angle and ball by guessing (lots of experience here) at the
chuck included starting cold pressure. If you want the tire to
grow to 38 psi on the track you set it in the pits
at say 28 psi. Sounds reasonable. You have been
.1% doing it for years.
Accuracy But what was the temperature in the pits? If it was 80°
US Pat. (like it usually is) you are OK. But what if one or two had
#6,983,209 been in the sun and had crept up to 90°? For every 10° temp
Temperature Compensating change there is a .8 psi change. So instead of 28 psi (at 90°)
you effectively set it at 27.2 psi (what it would have been at
Tire Pressure Gauge – To .1 psi 80° rather than 90°).
Would this make a difference? If not turn the page and look
• Corrects tire pressures back to a standard temperature at our other gauges. If it would, (NASCAR® Cup teams fret
• Displays what the pressure would be if the tire was about .2 - .3 psi) you really need to set all starting pressures
actually at this temperature • 0-100 psi by .1 psi at the same temperature, week in and week out. This way the
• Will also function as a traditional tire pressure gauge on-track pressures will be the same. But how do you do that?!?
You will have great difficulty controlling the temperatures
showing actual pressures – all 4 stored on display (impossible really). And yet you need to.
• And it will work as a precision tire pyrometer, A better way is to correct the pressures to what they would
displaying all 12 tire temps at the same time have been had you been able to keep the tires at a constant
#53050 0-100 psi...............$398.90 temperature. You could use a pyrometer to measure the tire's
temp, then use a calculator to compute what the pressure
#53007 0-60 psi................$349.90 should be at that temp rather than just putting in 28 psi. Slow
#53030 0-150 psi with foot valve.....$429.90 and cumbersome to say the least.
#53053 gauge and case only.....$349.90 But you don't have to do that. This "Temperature
(less probe – for tire pressure Compensating Tire Pressure Gauge" will do it for you. It can
only – see page 42) take the temperature of the tire using a traditional tire temp
probe, instantly calculate the correction back to a standard
• Back light • Silver case temperature, and show the pressure you should be putting in
for night use and adjustable the tire. It may not be the actual pressure at that moment. But
• Accurate to .1% tip tire probe included it will be the correct pressure when it counts, on the track.
• Reads to .1 psi • 3 bleed buttons for faster adjustments
Here's how it works. Plug in the tire probe in the side of the gauge as shown. Measure the Shown w.
temperature the usual way – in the tread area. Push the Mode button to get to Temp Compensation. tire temp
While in this Mode the pressures will be compensated and corrected back to a standard probe
temperature (80°F). Push Mode again to go to tire temps or back to traditional tire pressures.

TRADITIONAL TIRE PRESSURE MODE: PYROMETER MODE: Ultra fast response COMPENSATED PRESSURE MODE:
Displays actual tire pressures. PLUS it displays all 12 temps so you don't Displays what pressures would be at the
need to write them down as you go. standard temperature (80°F).
Tire pressures Tire temps
stored on stored on
display display

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