EFIDynoTuning Forum

decipha wrote: ↑2025 Jan 15, 08:39 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.

decipha wrote: ↑2025 Jan 13, 22:07 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.

There is merit to both sides... The 10 speed will out perform a 6 or 4 speed in a drag racing situation up to a certain power level. I have driven and raced against both and the 10 speeds versions will absolutely walk the 6 speed versions of same vehicle... However if you start making north of 4 digits the 10 speed starts to lose its benefits. A properly tuned 10 speed is a bad mofo from a performance standpoint. It may not have some of the robustness of a 4r or 6r but it surely can get down the 1/4 mile quicker if done right given same platform. I actually really like the 10 speed in my 2023 f250 as well. It is has much better programming than the 10 speed that was in my 2019 f150. Ford did good with that one.

Lol, I thought the EPA done tried to get you and you was on the run.

mbsvt1 wrote: ↑2023 Aug 25, 11:40 Hello, I am looking to get a 04 Lightning they said has a bad PCM (won't stay running)
My question is will a EK01 or EK02 work if I tune it with my QH? I have both of the pcm in my stock.
Thank you
MB

It will work, however it won't run your intercooler pump. I have an 04 lightning and put in the same ECU you listed and there is something different in the pinout where it won't run the pump. I just wired my pump to run fulltime but I'm sure it's easy enough to make it work like factory. Also if you ever want to get rid of one of those ECU's let me know.

I will add that it depends on what your long term goals/mods will be. I took the stock speed density really far with my 94 lightning but finally met the limit of it. I went pimpxshift and it is great. But I subject my stock bottom end to 800+ hp so yeah lol.