PGM-FI Setting
18
Engine Speed Calculation
Engine Speed= Vehicle speed (km/h) x 1,000/60/Tire circumference x
Primary ratio x Transmission ratio x Final ratio
Example: (cross ratio transmission, final ratio 16/43)
4.926 rpm = 60 km/h x 1,000 ÷ 60 ÷ 2,000 x 1.604 x 2.286 x 2.687
An actual engine speed changes depending on the circumference of the tire
and other factors.
So we recommend an actual speed of the vehicle to be measured.
When the pit road is down slope, the actual speed might higher than the cal-
culated speed.
So we recommend that the engine speed to be set 200 min
-1
(rpm) lower than
the calculation value.
The pit road speed list is included in the CD-ROM (Microsoft Excel file).
The each tire circumference value in this list is the reference value.
So measure each tire actual circumference and reculculate the vehicle speed.
Primary ratio:
Gear teeth
Ratio
48/77
1.604
Transmission ratio:
Cross ratio transmission
Standard transmission
Gear teeth
Ratio
Gear teeth
Ratio
1st
14/32
2.286
13/33
2.538
2nd
17/33
1.941
17.33
1.941
Summary of Contents for PGM-FI
Page 27: ...Memo...
