MoTeC Global Forum

I have turbo speed setup in my CDL3 for an EFR 7670, it has 14blades although not evenly spaced, the rpm's seem a bit high (20%) for the given boost,

A few things to check:

Are the blades actually unevenly spaced? That would seem a bit unusual. If it is the case then it won't work into the Dash. It has to be evenly spaced.

Does the speed sensor have a divisor? Most of them don't give you 1 pulse per blade but something like 1 pulse per 8 blades. Do you have a datasheet for it you can post?

Thanks Adrian,

Yes found the specs:


I have seen someone set it up in an ADL3 digital input like this:

29.17hz = 1,000rpm
4375hz = 150,000rpm

The equation is as follows:
1,000,000rpm * number of comp blades (14 for a 9174) = 1,400,000 blade passes per minute
1,400,000/60sec/min = 23,333 blade passes per second (hz)
23,333 / 8 count sensor divisor = 2,917 hz sensor output frequency.

The EFR 7670 has a max of 139,200rpm from memory so 150,000rpm should work.

I have seen someone set it up in an ADL3 digital input like this:

29.17hz = 1,000rpm
4375hz = 150,000rpm

The equation is as follows:
1,000,000rpm * number of comp blades (14 for a 9174) = 1,400,000 blade passes per minute
1,400,000/60sec/min = 23,333 blade passes per second (hz)
23,333 / 8 count sensor divisor = 2,917 hz sensor output frequency.

The EFR 7670 has a max of 139,200rpm from memory so 150,000rpm should work.

That calibration is correct. You don't need to worry about the maximum value of 150,000rpm, the Dash will extrapolate the channel value if the input goes over that value.

Thanks Adrian, I entered info into SPD1, Turbo Speed, custom calibration