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Old 05-01-2007, 16:45   #1 (permalink)
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Question Can't keep up!!!!

We're running a BF XR6 turbo ute thats currently been flashed and fitted with a F6 Air box and intercooler.Cars real quick but the problem we're having now seems like the 6 speed auto can't keep up with the engine.Any thoughts or idea's to this would be appreciated.
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Old 06-17-2007, 05:59   #2 (permalink)
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Re: Can't keep up!!!!

The 6 speed software was purposely designed with a very narrow rpm/torque band for each gearchange, so these boxes will always try to shift up/down around these parameters. That's why there is 2 different versions of it for the stock and performance models. It also has it's own control unit (TCM) as opposed to the 4 speeds that were controlled by the PCM. I understand the TCM software is very hard to overwrite and everyone I've spoken to have gone to the 6 speed manual as their only way around this. Hope this helps.
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Old 01-15-2008, 17:18   #3 (permalink)
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Re: Can't keep up!!!!

ok so if i have a 05 xr6t and i highly mod i will have trouble with the 4 speed??
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Old 01-15-2008, 22:00   #4 (permalink)
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Re: Can't keep up!!!!

Short answer: Yes, eventually.
If you modify the engine without upgrading the gearbox you'll blow the box up. It's not so much the extra power as the extra torque that damages them. Keep in mind that when Ford released Typhoon, which has only 30-40 kw more than a stock turbo, it was only sold as a manual, precisely because the 4 speed box could not handle the extra torque.
Marc
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