1-2 shudder at WOT

[djxfactor]

My Flex CONSISTENTLY does this on a WOT.  I have always attributed this to wheel hop/spin and never had a clue that it could be a transmission shudder from line pressure.  I was convinced it was my tires breaking loose and wreaking havoc on the driveline.  Its like my dash is shaking apart when the 1-2 shift happens and it scares the crap out of me that I'm going to break something.  I'm going to reach out to Torrie to see if he can revise my tune to account for the shudder.  Thank goodness Steal Blue revived this dead thread!!

[AJP turbo]

There is more to it than shift pressures....thats only half of it

[StealBlueSho]

There is more to it than shift pressures....thats only half of it

Alright Eco-Wan Kenobi... help enlighten me? Rumor has it, its shift pressure, you yourself posted that in this thread earlier...

[AJP turbo]

There is more to it than shift pressures....thats only half of it

Alright Eco-Wan Kenobi... help enlighten me? Rumor has it, its shift pressure, you yourself posted that in this thread earlier...

I did along the way yes....but things have changed...this i will keep for the time being

[djxfactor]

There is more to it than shift pressures....thats only half of it

Alright Eco-Wan Kenobi... help enlighten me? Rumor has it, its shift pressure, you yourself posted that in this thread earlier...

I did along the way yes....but things have changed...this i will keep for the time being

Well, crap.  That doesn't help me till I can afford to pay you for your Jedi-tuning skills...

[StealBlueSho]

I am just assuming he already has all the transmission stuff taken care of in the tunes he provided to me...

[StealBlueSho]

Interesting response from LMS....

Basically, they were aware of the transmission stuttering issue in the past and made corrections to the tunes... and re-released the "4+X" as the "4+x race" tune with needed adjustments...

Funny, when I flash the 4+x tune, there is no issues, once the transmission "learns", I start having issues.... Anthony didn't really have a response for that...

He mentioned that since they have never made any adjustments for my strategy and have not written a softer shifting 4+x for my strategy, they are going to have to rewrite the whole thing....

Any how.... fun fun... not sure about my strategy but it continues to give tuners headaches....

I just don't understand why it would only start stuttering after the transmission does its adaptives... it shifts harder while its learning without an issue ...

[Brucelinc]

Stealblue, when was the last time you changed your transmission fluid?

When I first experienced the 1-2 shift shudder a couple of years ago, I asked for and received a tune with less trans hydraulic pressure.  That solved the problem but I missed the shift firmness.  I was also puzzled as to why it was great for 15,000 miles or so with the higher pressure and then began the shudder all of a sudden.   I changed my trans fluid and put the original tune back in.   The shudder was gone and the shift firmness was back like I liked it.

Since then, I have changed the fluid annually and never had another shudder - including multiple back-to-back runs at the track. 

Was it the fresh fluid that solved the issue or was it just a freaky fluke?   Maybe just reflashing the tune somehow "fixed" it?   I really have no idea.     

[StealBlueSho]

Stealblue, when was the last time you changed your transmission fluid?

When I first experienced the 1-2 shift shudder a couple of years ago, I asked for and received a tune with less trans hydraulic pressure.  That solved the problem but I missed the shift firmness.  I was also puzzled as to why it was great for 15,000 miles or so with the higher pressure and then began the shudder all of a sudden.   I changed my trans fluid and put the original tune back in.   The shudder was gone and the shift firmness was back like I liked it.

Since then, I have changed the fluid annually and never had another shudder - including multiple back-to-back runs at the track. 

Was it the fresh fluid that solved the issue or was it just a freaky fluke?   Maybe just reflashing the tune somehow "fixed" it?   I really have no idea.   

Good question, I had all the fluids (PTU, Transmission, RDU, and Motor) changed/flushed 3K miles ago.

I just got back from the shop this morning to verify they used to correct TYPE of fluids, which they did. The only concern I have is they used Cam2 full synthetic performance fluids for the tranny and RDU, which is obviously not Motorcraft, I specifically asked for OEM fluids...they informed me that they used OEM equivalent!

I have been using this shop for a long time, the master mechanic is one of my best friends... they got a new manager which I think screwed me? Dunno... not a fan of word smithing to get what you want or imply something that it's not..

http://www.cam2.com/products/Automatic-Transmission-Fluid/CAM2-Dexron-VI-Multi-Vehicle-Full-Synthetic-ATF.html

Googling seems to say it's good stuff..

Even so, I can't image fluid breaking down that bad in 3K miles...


I am tempted to do a drain and fill with motorcraft... although I doubt that will change much..

I have various tunes from LMS, AJP, and Torrie...

The ONLY tune that causes the stutter is the 4+X.... and it's not right away... once the transmission does it's adaptives does it happen... I reflash.... goes away for awhile...

[AJP turbo]

Stealblue i thought the trans used low viscosity fuel efficient atf? That cam2 fluid looks to be regular?

[StealBlueSho]

Stealblue i thought the trans used low viscosity fuel efficient atf? That cam2 fluid looks to be regular?

Looking it up, but he product sheet says it's designed for cars that take Mercon LV... along with other low viscosity atf fluid...


http://www.cam2.com/images/product_files/7907.pdf

You get my email about the E20 tunes?

[StealBlueSho]

I have no issues getting them to do a fluid swap with Mercon LV if the Cam2 is not OE...

[StealBlueSho]

Stealblue i thought the trans used low viscosity fuel efficient atf? That cam2 fluid looks to be regular?

Website claims its low viscosity....

http://www.cam2.com/images/product_files/2691.pdf

[StealBlueSho]

Mercon LV Data Sheet -> https://www.fcsdchemicalsandlubricants.com/main/additionalinfo/Product%20Data%20Sheet%20MERCON%20LV.pdf

Cam2 Dextron-VI Full synthetic LV Data Sheet -> http://www.cam2.com/images/product_files/7907.pdf


They are within .5% of each other's viscosity ratings...

The only difference would be additives at this point...

[AJP turbo]

Ah ok, it's probably good stuff then...I'm just used to the LV fluids showing that on the bottle face....Either LV or fuel efficient. But I see the specs where it says Mercon LV