Early shift between 1st and 2nd

[floatdrop]

Greetings from Australia,

WOT, trans shifts at aprox 5000 rpm rather than redline. Just had injectors ultrasonically cleaned and inlet ports de-carbonised. Mapped, BMC filters and sec cat delete, all a couple of years ago. 660hp at wheels. Transmission map is std. Could the transmission map be upshifting early due to higher than expected torque?

[welwynnick]

What happens if you accelerate at less than full throttle, so the torque isn't higher than expected?

Nick

[floatdrop]

Hi Nick

50% of WOT, manual shift off paddles, still changes automatically at 5-5500 rpm.

[welwynnick]

When did it start behaving like this - was there a particular trigger event?

Nick

[floatdrop]

Nick,

After the injector and carbon clean.
I had the transmission rebuilt around 18 months ago, had them check it, oil looks good, no fault codes. Leaning toward something not connected correctly after the clean.