N/V Value Converter

Used for creating the value required for dialing in your gear change (ring and pinion) in your tuning. It's really just a dummy way of figuring Gear Ratio/812 or Engine Speed / Vehicle Speed = N/V

Commonly used in SCT and TunerPro software. You can see the help topic taken directly from SCT PRP if you want by going here.

Go to the Gear Swap and Transmission Shifting Write-up here.

HINT: You must also figure your multipliers and other values.

Quick Math for example below;

127.5 = ____ ?RPM (127.5 is ths max ECU recognized speed value)

So in short if you want 6700 max RPM in 1:1 you would figure 52.5 X 127.5 (N/V) to get 6,693.75 RPM.

Example;

A 3.55:1 Gear Ratio = an entry of 3.55, and gives you an output of  43.7192118226601. Only use what is underlined and only the first THREE numbers. Place them in your tuning software like 43.7

Ideally, if using our CalibrVIIItor software as an example, you would figure this;

1. N/V Base = 43.7
2. Multiplier = 10
3. N/V Product = 437
4. Min Learned for Trans = .75
5. Max Learned for Trans = 1.25

After all of this stuff you still might not be completely dialed in. Its best to throw a value at it that accomodates the math. Changing the N/V can also change WOT shift points, shift schedules and sometimes even fueling tables. Be careful as you could throw it outta whack.

N/V Converter for dialing in gear ratio changes