Discussion in 'Ford F-150 Raptor General Discussions [GEN 2]' started by bumwhine, Jan 17, 2018.
Didn't the Gen 1's have the 9.75"?
You asked about the front replacement. This thread is about the possibility for a rear Wavetrac application.
The front differentials in the Gen1 are 8.8".
Raptor has electronic traction and stability control so a LSD is kind of redundant on the road.
I assume you opted out of the front Torsen differential then. Good thing about the Wavetrac is when it’s torque biasing (under zero load conditions) it’s helping to limit the use of electronic driving aids. We obviously see this more in road race / track day situations, but it would have benefits here both on- and off-road.
I have the Torsen, but find it annoying on the street because of the excessive torque steer. I only use 4A when I absolutely need it because I hate the steering feedback.
I think you're confusing torque steer with traction. Drive an open differential FWD car pointed straight and mash the throttle, fighting to stay in the lane is a result of torque steer. It's a definitely a different feeling if you're not used to it.
I'm familiar with FWD and AWD vehicles, but the Torsen is on a different level. It is so pronounced it convinced many Raptor owners into thinking something is wrong with their truck. There are plenty of threads here on the subject. Raptors without the Torsen don't have this torque steer and neither do Ford's other AWD vehicles.
I gather you don't have a Raptor, but it feels like a rubber band is trying to keep the steering wheel centered and it is especially pronounced if there is a crown in the road. Non-Torsen Raptors feel like normal AWD vehicles in 4A and this weird feeling is probably why the Torsen is an option and not standard.
And mechanically this sensation makes sense because the Torsen is designed to keep both wheels spinning at the same speed, which means it fights you every time you are in a turn (taking power from the faster wheel and transferring it to the slower wheel). You don't get this resistance in a traditional diff that is perfectly content letting the wheels spin at different speeds.
I have a 2018 802A with the Torsen. Regardless, this thread is about gauging interest on a REAR application for a Wavetrac differential... of which there seems to be none.
A Torsen is designed to bias torque to the wheels that can accept the traction, which is why they aren't a true 'limited slip' differential. If by 'traditional diff' you mean 'open differential' you are correct, the wheel is free to spin. The differential is not fighting you, it is aiding you. To imagine that you'd replace a mechanical limited slip or helical differential in any performance-oriented car with an electronic nanny is pretty humorous though. Maybe if it was an electrohydraulic clutch system like those in some Audi Quattros I'd agree.
Good lord I can't get this forum's YouTube embed to work: https://youtu.be/JEiSTzK-A2A
Another video comparing pros/cons of each type: https://youtu.be/x40WGUtdaLI
Wavetrac differential: https://youtu.be/QEhLGe_M6XU
Raptor has electronic nannies for street use and locking diff for "performance" use. I'm not sure where the LSD fits in and the lack of a compelling use case is why you are not seeing any enthusiasm for your proposal.
The locking diff turns off at 20mph and does not work in 2WD without splicing a module into the wiring harness. Replacing the differential works at any speed, in any condition, all the time.
Thank you for your input.
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