New ISX motor ?

[schISM]

(05-08-2019 )Camstyn Wrote:  Still a little concerned about the jake performance, as from everything I’ve heard it’s supposed to be very impressive and it’s not, at all. Works good enough for the light duty work we’re doing but it doesn’t seem right.

Im not sure about the X-15 but other models use a different cpl for 500hp and above. If you turned it down with a factory tune chances are it’s wrong and affecting the Jake and mileages adversely.