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GT GAS Part# 40417
18. The GT Gas will prompt you to select settings for the “Download Functions”. Be aware that some functions
are not available for every vehicle.
TUNING VEHICLE
INSTALLING THE TUNE
– JEEP VEHICLES ONLY –
Jeep vehicles require slightly different installation steps than other vehicle applications, the
following are the steps you need to follow for Jeep installation.
POWER LEVELS
Choose the option that matches the octane of fuel
in the gas tank.
Premium: 91+ octane; up to 35
lbs. additional peak horsepower
and 40 additional peak torque
Regular: 85+ octane; 15-20
additional peak horsepower and
15-20 additional peak torque
Stock: Original factory
horsepower settings. (This option
enables the GT Gas Special Functions without changing
engine performance.)
REV LIMITER
Limit how fast (in RPMs) the engine will run.
D REV LIMITER (Drive): Set the
maximum engine speed while the
vehicle is in gear.
N REV LIMITER (Neutral): Set the
maximum engine speed while the
vehicle is in Park or Neutral.
WOT SHIFT POINTS
(SELECT VEHICLES)
Change the RPMs at which automatic transmission
will change gears.
1-2 SHIFT: Set the shift point
between first and second gears.
2-3 SHIFT: Set the shift point
between second and third gears.
SPEED LIMITER
Change your vehicle's top speed.
MDS
(SELECT VEHICLES)
Enable or disable MDS
(4-cylinder mode multi-
displacement.)
TIRE SIZE
Set the tire size; correct the
vehicle speedometer if you
have changed your tire size
from stock.
AXLE RATIO
Set the axle ratio; correct
the vehicle speedometer if
you have changed the gear
ratio from stock.
POWER LEVEL
ENTER
Select Power Level
Premium
Regular
Stock
MDS
ENTER
Select MDS Setting
Disabled
Enabled
TIRE SIZE
ENTER
Up
Down
Set Tire Size
By using the
Up and down Arrows
30.0
INCHES
(23.0 to 45.0)
TIRE SIZE
ENTER
Up
Down
Set Tire Size
By using the
Up and down Arrows
30.0
INCHES
(23.0 to 45.0)
N REV LIMITER
ENTER
Up
Down
Set Neutral Rev Limiter
By using the
Up and down arrows
4000
RPM
(2000 to 6700)
1-2 SHIFT
ENTER
Up
Down
Set 1-2 Shift Points
By using the
Up and down arrows
5600
RPM
(5400 to 5800)
SPEED LIMITER
ENTER
Up
Down
Set Speed Limiter
By using the
Up and down arrows
106
MPH
(45 to 200)
19. The GT Gas will The GT Gas will build and
download the tuning file.
DO NOT INTERRUPT THE GT GAS.
When the GT Gas has finished installing the
tuning file, the download is complete!
Slide the switch on the adapter plug to “KEY”
