I can't remember exactly but I think its 2 second or so before it hits limp mode.
There must be different models as I do know that this is being used for the Patrols. I'm crap when it comes to deciphering this electrical stuff. But I dont think they are using the rpm side of it. Just accessing the maf voltage signals.
https://cdn.shopify.com/s/files/1/01...anual.pdf?1955
http://www.14point7.com/pages/softwa...-documentation