2big bronco You get this thing figured out or no? I've been reading about the 74Weld Portals for the last couple days and it really does seem like the way to go, but I only want a stick shift and I'd like no problems with when the time comes. Considering what I had in my last DD/Off-Road rig, $20k for the Portals and another $4K for wheels and tires really isn't that bad if you start with the right platform. I had probably that same amount in my old truck on 35's. Portals get you better gearing and 37's all in one shot.
So, is it a limitation of the Ford software that prevents setting it up right? That seems to be the case with the largest tire size of 2800 and max gearing of 5.40, but Forscan won't play ball? That's what I gather from this thread and the one over on B6G. I guess that winds up being the question, is Forscan worthless for a Portal'd Bronco so far as tire and gear is concerned and you have to go Procal or did you get Forscan to stop being fucky?
Going off the online calculator on Spicers site (
Spicer Transmission Ratio RPM Calculator), the max values should get you about 1mph off at 2000 rpm.
Factory
FD - 4.7
Tire - 32.5
RPM - 2000
6th Gear - 0.646
Speed - 63.72mph
Portal w/Max Settings in Forscan or Procal (the best I can determine)
FD - 5.40
Tire - 37 (2800mm in Forscan apparently, or 2890, depends on what you read)
RPM - 2000
6th Gear - 0.646
Speed - 63.13mph
At the end of the day, do you just set Forscan or Procal to the max settings and send it to shut the computers up?