Product • Support • Tuning
928-706-6112 • www.TheEFIStore.com
Cart 0
Free Shipping On orders over $1,000
Expert Support Product. Support. Tuning.
Expert EFI Tuning Support TheEFIBrain 24 Hour Chat
Top Brands Holley, MSD, RacePak & More
Secure Checkout Safe & secure shopping

Home / Tech Center / Shift Table Calculator

Shift Table Calculator

Road speed over engine RPM in every cell, throttle across the top — the grid and the curve in one window. Type into either number and the other follows. This is a planning tool, not a tune — book a session or call 928-706-6112 to get it dialed in.

Driveline Setup

Tire Size
Diameter in
Width mm
Aspect
Rim in
ring & pinion ratio
Model
Gear set
4 forward gears
rpm — graph marker & autofill top
rpm at WOT — flags shifts that land under it
% — converter slip, raises engine rpm
TPS Axis Autofill shift rpm to · drop · floor

Shift Speed vs. Throttle Position

every cell — mph over rpm
Table is consistent.

Shift Curve

Plot
Highlight

WOT Shift

Set every shift to rpm

Move It In & Out

format as

Driveshaft Critical Speed

the rpm the shaft starts to whip
Tube
Length in
Tube OD in
Wall in
Material
Length is between the U-joint centers, not end to end. A two-piece shaft on a carrier bearing is two short shafts — measure one section.
RPM = MPH × 336.135 × gear ratio × final drive ÷ tire diameter  ·  MPH = RPM × tire diameter ÷ (336.135 × gear ratio × final drive)  ·  converter or clutch slip divides engine rpm by (1 − slip)
Expert Tech Support We know performance
Same Day Shipping Order by 2PM MST
Hassle Free Returns 30-Day Money Back Guarantee
Financing Available Buy Now, Pay Later