Early shift between 1st and 2nd

5.0 V10 50v biturbo - 571 bhp
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floatdrop
Neutral
Posts: 15
Joined: Sun Oct 26, 2014 10:40 am

Early shift between 1st and 2nd

Post by floatdrop » Mon Sep 09, 2019 7:26 am

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
2nd Gear
Posts: 161
Joined: Fri May 25, 2018 4:53 pm

Re: Early shift between 1st and 2nd

Post by welwynnick » Mon Sep 09, 2019 9:19 am

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

Nick

floatdrop
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Posts: 15
Joined: Sun Oct 26, 2014 10:40 am

Re: Early shift between 1st and 2nd

Post by floatdrop » Tue Sep 10, 2019 1:33 am

Hi Nick

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

welwynnick
2nd Gear
Posts: 161
Joined: Fri May 25, 2018 4:53 pm

Re: Early shift between 1st and 2nd

Post by welwynnick » Tue Sep 10, 2019 8:40 am

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

Nick

floatdrop
Neutral
Posts: 15
Joined: Sun Oct 26, 2014 10:40 am

Re: Early shift between 1st and 2nd

Post by floatdrop » Wed Sep 11, 2019 1:20 am

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.

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