I am creating software to determine what gear I am in and display the gear for me and later a shift light for redlining. Does anyone know of a way to calculate if I am in neutral. I know how to calculate my speed based on my RPMs and Transmission gear ratio and Differential Gear Ratio. I have a VW GTI 2010 that I am going to test my software with. My formula is this 0.00595*((RPM*10.994625)/(TransGear * DifGear)) = Speed. Once I figure out the speed I compare it to my current speed and if it is in a certain bound i'm in such and such gear. So after a long winded story how would I calculate my engines Idle speed. would I need my compression ratio, temperature, etc? If I can't calculate it can someone give me some possible logic i could use in my software. I usually calculate for three gear at the same time(Lower, Last Known Current, Higher). I want to indicate gear Neutral when the user shifts out of gear but is still rolling whether its down a high or on the flats.

Below is my gear ratios:

Trans Gear Ratio

1st 3.36 GVT

2nd 2.09 GVT

3rd 1.47 GVT

4th 1.10 GVT

5th 1.11 GVT

6th 0.93 GVT

Reverse 1.64 GVT

Differential ratio

Final I 3.94 GVT *for Gear 1-4, R

Final II 3.09 GVT *for Gear 5-6

Below is my gear ratios:

Trans Gear Ratio

1st 3.36 GVT

2nd 2.09 GVT

3rd 1.47 GVT

4th 1.10 GVT

5th 1.11 GVT

6th 0.93 GVT

Reverse 1.64 GVT

Differential ratio

Final I 3.94 GVT *for Gear 1-4, R

Final II 3.09 GVT *for Gear 5-6

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