Looney fuel shifting - Ford Powerstroke Diesel Forum
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  #1  
Old 12-24-2012, 05:58 PM
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Looney fuel shifting

I have Vivian's looney fuel on my 05 f250 and am having some shifting problems. When my transmission is cold the 3-5 shift slams into 5th, jumps back out, jumps back in, back out, and back in. It does this under normal acelleration. Earlier today it did it in 5-6 shift too. Has any one else had this problem? I love the tune, more power than my srl, and im getting used to the lights witch effect but the shifting can be brutal. Vivian's customer service is top notch too, she has already revised my tune 4 times to try and work out the shift points and torque converter points but never got them right. I decided to take a break on trying to get it worked out but the way the trans is acting when cold is starting to scare me. Probably gunna get back in touch with her after Christmas. I would like to point out out my srl doesn't do this and my truck strategy is vxcf0.
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Old 12-25-2012, 06:39 AM
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My opinion is the extra Hp and Tq are exposing a weak Tranny.

As example... if you had done nothing to it and this was happening what would you think was wrong?

I realize it's not what you want to hear, and probably doesn't do it when stock tune loaded which supports my theory.

d
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Old 12-25-2012, 06:51 AM
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I'm assuming your tune has the normal (factory) TQ lock up?
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Old 12-25-2012, 07:29 AM
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I thinks it does have stock torque converter lock. It was supposed to lock in 5th and 6th but it doesn't. The third revision of this tune did lock in 5th but it would shift into 6th locked almost immediately after. This made the 5th lock seem pointless to me. In the fourth and most recent revision I tried to get those shift points worked out but for some reason it lost the ability to lock in 5th. So my shift pattern is 1-2-3-5-6-6locked. That is the stock shift pattern correct?
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Old 12-25-2012, 07:45 AM
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I'm not going to rule anything out but I really don't think its a weak tranny. I bought this truck in August 2011 with 68000 miles, completely stock and no gooseneck hitch. As far as extra power, this tune has most of its power when I hit about 45% throttle, my shifting problem will happen before that power ever comes on. I would also like to add that once the transmission warms up it shifts like a dream no matter how hard I accelerate.
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Old 12-25-2012, 07:54 AM
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Is the tune corrupt? Define cold, the 5R's go into a defensive mode when very cold. All of the shifts are hard when cold. Viv's shifts are generally pretty soft and you are saying it only happens cold so I am guessing it is the tranny protecting itself from the sludge pumping through it when cold.
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Old 12-25-2012, 07:59 AM
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Once the transmission fluid temp gets over about 70 degrees it starts to get better. What is the shift flare I have heard about?
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Old 12-25-2012, 08:03 AM
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Seeing that you are in Texas I doubt it is cold enough outside to cause the tranny to protect itself.
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Old 12-25-2012, 08:20 AM
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My truck will do the same on Tony Wildman's extreme tune occasionally, and never when the trans is at operating temps. No issues with stock tune and Atlas 40.
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Old 12-26-2012, 01:50 AM
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I recall the shift pattern more like 1-2-3-4-6 when cold, then 1-2-3-5-6 when warm.

Try the following:
Make sure the engine and transmission are at operating temps. Shift thru the following sequence three times (N-R, N-D, D-R, R-D) pausing three seconds between each engagement.
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