2024 Mustang Dark Horse — Whipple Stage 1, 10R80 — Persistent flutter/stutter + downshift clunk. Anyone seen this? (Taking it to Ford next week)

[135Hoser]

Ok

My understanding is: Don't lug the motor. Seeing knock retard in 8th/9th when going into boost is pretty normal. Your motor doesn't like it, don't do it.

Second, You really shouldn't be frequently going into boost in anything past 7th. The transmission from factory isn't physically designed to handle the torque of a supercharged whipple in those high gears. Whipple talks about this in their product literature.

I don't think chatgpt is being helpful on ideas 2 or 4. If it's an issue with the mapping, wouldn't *every* whippled 10r80 suffer from this? or more than just you? Honestly if anything my 10r80 shifts too firmly.

Check transmission fluid level, if it was a u-joint why would it matter what temp the transmission fluid is at. I'm pretty sure on whipple tunes if Knock retard says -4 that means its adding 4 degrees of timing. Throw a can of octane booster at it if you want to rule that out.

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[SC Dark Horse]

Ok

My understanding is: Don't lug the motor. Seeing knock retard in 8th/9th when going into boost is pretty normal. Your motor doesn't like it, don't do it.

Second, You really shouldn't be frequently going into boost in anything past 7th. The transmission from factory isn't physically designed to handle the torque of a supercharged whipple in those high gears. Whipple talks about this in their product literature.

I don't think chatgpt is being helpful on ideas 2 or 4. If it's an issue with the mapping, wouldn't *every* whippled 10r80 suffer from this? or more than just you? Honestly if anything my 10r80 shifts too firmly.

Check transmission fluid level, if it was a u-joint why would it matter what temp the transmission fluid is at. I'm pretty sure on whipple tunes if Knock retard says -4 that means its adding 4 degrees of timing. Throw a can of octane booster at it if you want to rule that out.

All of the behavior I described is while driving on the stock Ford transmission tune leveraging true auto. I'm not paddle shifting or intentionally lugging. I would assume if this is the issue, Ford would be able to identify this and recal the transmission to alter the behavior. I did drop it off yesterday and just received an update that they've put in a ticket with Ford to pinpoint an "issue." Not sure what it is yet, but will be sure to update the thread when I know more. Thanks for the feedback!