SCT Shifting Rough - Ford Powerstroke Diesel Forum
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Old 07-16-2008, 10:17 PM
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SCT Shifting Rough

Got the truck flashed after some warranty work and had innovative write me some new tunes. I absolutely love the smoothness of the stock tranny shifting but love the power of the tuned engine (xtreme street) and dread the shifting. For some reason I cannot get the dang thing to shift smoothly. I give it 100+ miles of driving before I try to change the shift pressure and it will shift smooth if I don't get on it but it feels like I am dropping the tranny when I get on it to keep up with normal traffic flow. When stock the tranny shifts like butter and makes me feel all good inside. I am half tempted to go back to stock. So here are some questions:

1)What is the shifting option for WOT do?
2)Should I be doing anything else?
3)If I change to street instead of xtreme street will it shift better? What about tow agg?
4)Am I screwing up the tranny?
5)What would you do?
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Old 07-16-2008, 11:38 PM
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i would like to know this as well so here's a bump
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Old 07-17-2008, 12:10 AM
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shift at WOT will change at what percent of WOT it will shift at ( i believe ). try reducing your pressures a little more, maybe another 5 to 10 percent and try it out.
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Old 07-17-2008, 06:21 AM
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I would immediately return it to my Extreme Race program since the shifting on ER seems to work better on my truck.
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Old 07-17-2008, 08:39 AM
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Quote:
Originally Posted by hvyw8 View Post
Got the truck flashed after some warranty work and had innovative write me some new tunes. I absolutely love the smoothness of the stock tranny shifting but love the power of the tuned engine (xtreme street) and dread the shifting. For some reason I cannot get the dang thing to shift smoothly. I give it 100+ miles of driving before I try to change the shift pressure and it will shift smooth if I don't get on it but it feels like I am dropping the tranny when I get on it to keep up with normal traffic flow. When stock the tranny shifts like butter and makes me feel all good inside. I am half tempted to go back to stock. So here are some questions:

1)What is the shifting option for WOT do?
2)Should I be doing anything else?
3)If I change to street instead of xtreme street will it shift better? What about tow agg?
4)Am I screwing up the tranny?
5)What would you do?
okay a couple things... first off the "smooth buttery" shifting is actually BAD for your truck when making more power than stock, even stock power for that matter. the "dropping the tranny" feeling that you get with it tuned is GOOD for your truck.. i know this sounds funny, but a hard firm gear change is a "no slip" gear change. the factory tuning uses pulse width modulation of the converter to allow for those smooth shifts by actually letting it "slip" a little bit.. this in the long run will lead to excess wear, and also creates more heat. the firm hard shift is because there is no "slip" and this results in the clutch packs in your tranny lasting longer and running cooler.

as for your questions :
1. the shifting option for WOT should be left alone. DO NOT MAKE CHANGES TO THIS OPTION. i finally got an answer from eric about this a few days ago, and i've been asking him for a long time, the answer was detailed, but simply put eric says do not mess with this one... make sure you have axle ratio and tire revs/mile set correctly. i've been going round and round with eric lately about shifting issues also, and he's got me dialed in very well now. please see the thread a i just posted in a few minutes ago about shift issues

2. see above for this answer, yes, do change axle ratio,revs/mile etcc

3. my street did shift a tad better, but the couple hundred less horsepower just made me not want to keep it loaded

4. as long as you have the tunes loaded from eric and you have clean fresh fluid you shouldn't be screwing up your tranny. of course this doesn't mean that holding the converter stalled up for extended periods of time is not bad for it.. keep the stall times to a bare minimum, only what you need to build boost and then GO ! ! get a trans temp gauge and monitor this is the best way to know whats going on. heat is the NUMBER ONE killer of automatic transmissions.

5. i would do whatever eric says
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Old 07-17-2008, 09:24 AM
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Reduce Shift pressure in all gears -10 percent!
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