Hi Guys,

I have been scratching my head with this one for a while now. Cant not find the answer anywhere online which points to it being a completely stupid question.
However I have no logical answer so hence the post.

When tuning a car on aftermarket management and initially setting up the fuel map you run through each RPM zone increasing throttle opening and manifold pressure.

For example at 2000 RPM you run through varying manifold pressures (-100 KPA -> 0 KPA) by adjusting the amount of throttle.

How does increasing the amount of throttle or running wide open throttle not increase RPM at the same time? I have seen videos where tuners can hover in a single RPM zone and increase the throttle opening without RPM increasing.

Do some dyno's have some sort of function to stop this?

Any feedback would be appreciated.

Thanks