6R80 with EEC-IV/EEC-V

[Slow94]

you can always use a 6r ecu to just control the trans no problem, same as the 4r and 6r people have done for years with 2 ecus.

im not sayibg the 10r is a bad trans but theres little to no benefit swapping from a 4r for the 6 or 10.

What same version vehicles are you referring to ?

Mustang and f150's specifically with coyotes. The coyote makes terrible torque but sure does like rpm. There is a very large performance gap between 2nd gen coyotes and 3rd gens. That isn't due to the few more HP. The 10 speed makes a huge difference in performance. I keep up with the Ford truck scene the most and the 10 speed trucks are miles away from the 6 speed trucks with same mods or HP levels. Heavy trucks that make little torque need the gearing to get moving and all the extra gears to keep it high in rpm range where the coyote makes power. For reference my buddy had a 2016 and 2018 rcsb coyote truck both with blowers and E85. Similar boost numbers the 2nd gen would run 6.6's in the 1/8th and the 3rd gen would run low 6's. It was quite literally a half second quicker with similar mods and actually a heavier truck. Now there is a limit to where the extra gears become a hindrance, but that comes well over 1000 rwhp. Usually that is when strength is prioritized and it's more simple to run a conventional 3 speed. Both the 6r and 10r have a useless 1st gear ratio with high horsepower so that makes the 6r left with 3 forward gears just like the 4r... The 10r however has 6 forward gears that allows coyotes in particular to stay high in the rev range. Good trans tuning is a must though.

[decipha]

Thats not a fair comparison as the gen 2 is 365hp and the gen3 is 435. Thats a 70hp difference all else being the same.

Even at the same peak power level the gen 3 will out torque the gen 2 across the board so thats not a fair comparison at all.

But thats all besides the point, the OP wanted to swap a 6r in lieu of the 4r I only mentioned the 10r as reference.

[Slow94]

Thats not a fair comparison as the gen 2 is 365hp and the gen3 is 435. Thats a 70hp difference all else being the same.

Even at the same peak power level the gen 3 will out torque the gen 2 across the board so thats not a fair comparison at all.

But thats all besides the point, the OP wanted to swap a 6r in lieu of the 4r I only mentioned the 10r as reference.

For comparison a gen 2 2017 f150 has 385hp and the gen 3 2018 has 395.... They are very close. 10hp and 13hp difference between the gens there. I'm not comparing gen 1 and gen 3. All the fastest trucks out there are running 10rs unless it's a full on race truck. At that point a th400 or similar makes more sense. But I agree that I would just stick to a 4r as it's a beast of a trans. The 6r has no useful benefits over the 4r unless used for highway mpg and that will be negligible. The 10r if it could be controlled is best option for performance and mpg within a certain power range say stock to 1000 wheel HP or so. Again my experience is mostly limited to trucks so take that how you will.

[Luis5.oh]

Then maybe because the cars with 6r and 10r are usually the ones with higher hp is why I feel them like better transmission

[Sevensecondsuv]

Thanks for all the info guys. I'm glad to hear there are properly tuned 10Rs running around. The application I originally had in mind when I started this thread was 90s/00s trucks and panthers with relatively stock 200-300 HP engines. It seems the wider total ratio spread of a 6R would be a very nice improvement over a 4R for that range of HP/weight ratio vehicles.

Out of curiosity, how does running 2 ECUs work? How many other parts and inputs are required to get the 6R ECU to function? Does it require a CANbus? One issue I see is EEC-IV/V is mechanical throttle body while anything with a 6R is electric throttle. Can a 6R ECU actually control a trans without also controlling the throttle body? My understanding was the throttle body and transmission were both fully integrated into the torque management control strategy such that removing the throttle body from the equation would basically result in needing to rewrite the entire strategy.