Standard Automotive Conversions

Length 

1mm = 0.03937 in.

1inch = 25.4mm

Example: (a)   60mm x 0.03937 = 2.36 inch

                (b)   3 inch X 25.4 = 76.2mm

Torque

1 kg-m = 7.2330139 ft-lb

1 ft-lb = 0.138255 kg-m

Flow Rate

1 lbs./hr. = 10.5 cc/min

1 cc/min = .095238 lbs/hr

Speed

1 mph = 1.609344 km/h

1 km/h = 0.6213712 mph

Temperature

( _C x 1.8) + 32 = _F

(_F - 32)/1.8 = _C

Example: (a) (750C x 1.8) = 1350

                                            1350 + 32 = 1380 F

                (b) (190F - 32) = 158

                                            158 / 1.8 = 87.8C

Turbo Timer Wiring

Wires

Connection
Red  +12V constant
Green  +12V Ignition
Blue +12V Accessory
Black  ~Chassis Ground

Note: for cars with two ignition (ON) wires, connect the Green wire to the Ignition (ON) wire which does not drop voltage when the starter is activated. Then connect the Blue wire to the other ignition wire.

Greddy Electronic Gauge Wiring

Wires

Connection
Red  +12V constant
Orange  +12V Ignition
White +12V Light Source
Black  ~Chassis Ground
Yellow ~Negative Ground Output 

Note: Yellow wire is only on 60mm Warning Gauges. Installation of the yellow wire is optional.

Tire Speed Rating

On new tires any symbol denoting a fixed maximum speed capability will be shown in the tire's service description (205/60R-15 89H). Currently used tire speed rating symbols and their maximum speeds are shown below:

Q = 99 mph

T = 118 mph

V = 149 mph

R = 106 mph

U = 124 mph

W = 168 mph

S = 112 mph

H = 130 mph

Y = 186 mph

When a Z appears in the tire size designation (225/50ZR-16) it signifies a maximum speed capability in excess of 149 mph. If a service description also appears, the maximum speed is indicated by the service description as shown below:

225/50ZR-16

= 149+ mph

205/45ZR-17  88W

= 168 mph

285/35ZR-19  99Y

= 186 mph

Formulas

Tire diameter =               Circumference
                                        Pi (3.14159265)

MPH =                 Tire diameter (inches) X RPM (at redline)
                             336 X gear ratio (must be final drive ratio)

RPM =             336 X gear ratio (must be final drive gear ratio)
                                            Tire diameter in inches

Tire Diameter =    336 X MPH X Gear ratio (must be final drive gear ratio)
                                                                        RPM

Final Drive Gear Ratio =   Transmission Input to output ratio X Rear end gear ratio
                                          Ex: Transmission output = 1.2:1
                                          Rear end Gear = 3.89:1
                                          Final Drive Ratio = 1.3 x 3.89 = 5.057:1

Maximum Gear Ratio =         Tire diameter (inches) x RPM (at redline)
                                          336 (a constant number) x MPH (maximum speed)

 

Tire and Wheel Sizing

 

PIAA Lighting Terminology

 

AN Size to Standard Conversion Chart

AN Size

Metal Tube Outside Diameter in Inch

Thread size SAE

2

1/8

5/16-24 SAE

3

3/16

3/8-24 SAE

4

1/4

7/16–20 SAE

5

5/16

1/2-20 SAE 

6

3/8

9/16-18 SAE

8

1/2

3/4-16 SAE

10

5/8

7/8-14 SAE

12

3/4

1-1/16-12 SAE

16

1

1-5/16-12 SAE

20

1-1/4

1/5/8-12 SAE

24

1-1/2

1-7/8-12 SAE

28

1-3/4

2-1/4-12 SAE

32

2

2-1/2-12 SAE

AN = Army-Navy Size.

 

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