H&S Trans Tuning - Ford Powerstroke Diesel Forum

6.4L Performance Parts Discussion What has or has not worked for you?

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post #1 of 17 Old 01-18-2013, 07:20 AM Thread Starter
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H&S Trans Tuning

So before I lifted my truck, I ran the S2M tranny tuning and loved it. Now that I've lifted and put on 37's it seems like the converter doesnt want to lock in until 65mpg (already adjusted speedo for bigger tires)...so here's my question for you lifted guys...What have you found to be the best trans tune when running bigger than stock tires?

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post #2 of 17 Old 01-18-2013, 07:36 AM
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I love the S1L. With stock tires I like the S2M or S1M.

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post #3 of 17 Old 01-18-2013, 08:51 AM
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Honestly, this transmission tuning is confusing to me and defies what I know about gasser trans tuning..
In most gasser transmissions, modern, anyway, the pressures bounced off the speed sensors regulate shifting.. and, at least with mopar diesels in the 48rfe configuration, that holds true.. the t/c lock is a product of an electronic solonoid sensing steady pressure and constant speed, and literally flipping the switch that mechanically locks the main shaft and converter together..

These things seem to be regulated by speed alone.. seriously.. I can reach 50mph and shift to 5th locked (S1L), and stand on the throttle while remaining in 5th locked..

My question, and the point Im trying to make is: either that mph needs to be adjusted for proper shifting, and will vary with tire size/ overall gear ratio, or the tuner only manipulates the output of the mph reading to the gauge, and the tables/script in the pcm are reading it before its manipulated- and shifting based off of that.. which isn't optimum if that's the case..

Does anyone here know if the transmissions on these rigs are managed by hydraulics or if they are managed by a very rigid speed to shift event?
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post #4 of 17 Old 01-18-2013, 01:33 PM Thread Starter
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I'll give S1L a shot and see how I like it...I know for a fact that the transmission tuning from H&S shifts based on speed...at least I thought so because before I lifted the truck it would lock in the converter at 55mph...now it doesnt lock it until 65mph. My speedo is right on though..so it's weird. Anyhow, I'll try S1L and see how I like it...I'll be back. HAHAH

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post #5 of 17 Old 01-18-2013, 02:15 PM
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i only have 35's ,but i only like the S2 tunes. i dont care fore the 4th and 5th lock.

Im doing the S2L now and i like it. S2M i liked also. both shift around 50-55.
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post #6 of 17 Old 01-18-2013, 08:23 PM
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I have the s1l but have tweaked it through the mcc with the help of a friend. There are some minor changes that can be made to make the shifts quicker and lockup a little earlier in 5th and it will really shave some time off. We have seen 12.70s with the hd 300 tune with the modified s1l program on a ccsb with filter, intake , & exhaust. The s1l is the fastest setting at the track and has yeilded the best mpg on my trucks. Rpms stay low when easing around and if you step on it it locks and takes off.

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post #7 of 17 Old 01-18-2013, 08:24 PM Thread Starter
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Yep that's what I set it on...S1L and I loved it! We'll see how it is tomorrow!

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post #8 of 17 Old 01-19-2013, 02:54 PM
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H&S trans tunes settings (such as the torque converter lockup) are based on rpm not speed.


S1L for me.

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post #9 of 17 Old 01-20-2013, 07:58 AM Thread Starter
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Welp I think S1L is the one!

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post #10 of 17 Old 01-20-2013, 08:18 AM
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Re: H&S Trans Tuning

Plus, the S1's lock in both 4th and 5th whereas the S2's only lock in 5th.

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