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Old 03-21-2015, 01:50 AM
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Whippled SRT - Transmission relearn?

My 1st post here!

I have a 2015 SRT and I added a Whipple 2.9 blower. She dyno'd around 580 WHP on a Dynapack...and she runs very strong. She runs beautifully - just like stock only much more responsive and obviously a lot quicker. Oddly enough, fuel consumption is pretty much the same under normal driving with a few WOT's here and there.

She has a lot of power left in her. We pulled timing and AFR's are more towards the rich than lean side. I haven't yet done anything inside the motor, so I'm not going to take her to the edge right now, tuning-wise. Eventually, I'll forge the internals and pin the crank so I get that last 50-70 WHP out of her.

The only issue I have, is that the transmission seems to fall flat on it's face during WOT shifting in the higher gears. It almost feels like it can't decide what to do; shift, or stay where she is.

I am getting the feeling that she only needs a transmission relearn - and it feels like software to me...

Before I start digging deeper, I have a simple question:

Does the 8 speed transmission have a simple relearn capability and if so, what's needed to initiate a relearn, battery disconnect/ reconnect? Has anyone else here seen this issue on their WK2 after adding more power? I have also noticed the transmission clunking hard under WOT while (auto) downshifting, intermittently. There's no slipping though.

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Old 03-21-2015, 02:40 AM
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Re: Whippled SRT - Transmission relearn?

I was told by my dealer that the tranny is always relearning (I think they said over a 50 start cycle). I too saw "hesitation" and what felt like hitting the rev limiter when I first got my SC but it sorted itself out pretty quickly.
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Old 03-21-2015, 04:54 AM
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Re: Whippled SRT - Transmission relearn?

I have put about 600 miles on it with the new blower...about a week now. How long did it take for yours to smooth itself out? Mine is as bad as it was right after the blower install...
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Old 03-21-2015, 04:28 PM
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Re: Whippled SRT - Transmission relearn?

Mine was fine after about that time.... but I was also sending logs back to RIPP (in my case) and they were forwarding new tunes. My experience was doing WOT in 0-100 runs and I say it was 3rd with the "hesitation" at near max rpm. What gear is giving you grief?

Also you may find that hard shifts are part of the learned behaviour. The dealer was saying that they get a few wives complaining about hard shifts when they drive the Jeep. They say they are cautious in their response but the tranny has learned it's shift pattern from the husband driving... and they will have been driving enthusiastically recently.
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Old 03-22-2015, 02:05 PM
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Re: Whippled SRT - Transmission relearn?

I get the hesitation in 4th and up...but worse in the higher gears.
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Old 03-23-2015, 07:25 PM
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Re: Whippled SRT - Transmission relearn?

The trans is always learning.....so after a new tune is flashed in, it takes 25-100kms of varied driving to do a gross learn and then it continually fine tunes after that.
Best to start off gently and gradually give it more gas as it learns especially if it is now boosted. The large increase in torque from a blower will also need different numbers fed to the trans to make it work sweetly.
If you are using the Whipple base map and have just modified the fuel/spark, it will still need some more work. Their tune is really basic and needs lots of reworking/rescaling and many other changes including the torque numbers.
Look at:
Tables/Torque Calculation/Friction Torque Loss
Scalars/Torque Calculation/Max friction Adaptive Limits
Tuning these tables will change shift points and quality to better suit a blower.
Also, in the Whipple tunes I have seen, they turn off the Airflow and Spark Reduction to the trans but this can make the trans hang before changing as it is seeing too much torque. Re-enabling these in Scalars/Torque Management and allowing it to relearn will result in much faster,smoother shifts.
Your tuner should be able to sort this for you.
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Old 03-23-2015, 11:03 PM
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Re: Whippled SRT - Transmission relearn?

That's a very detailed explanation in response to my question. Thank you for taking the time to post that!

We didn't use a Whipple base tune - I had mentioned it to my tuner and asked him to call Whipple - and they told him they had nothing for that truck, so he built the tune from scratch, over 3 days. Truck runs perfectly.

I will forward this post to him and I'm sure he'll find it quite useful. Now, I will mention that during the 1st 20 miles after the build/ tune - we ended up doing many WOT runs only to find out the plugs blew. This caused a lot of headaches for us while shifting. Changed the plugs for colder plugs and the issues went away, but the transmission continues to shift like shit under WOT, not in all gears, but in a few of the higher ones. Under normal, or even moderately aggressive driving - the transmission shifts up/ down smoothly with no issues.

Sounds like we'll need to adjust some parameters and reflash for the initial re-learn to start.
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