Zage Turbo Kit Install - Toyota Yaris

[06YarisRS]

Originally Posted by DarkShadowFox

is this 4AT U340E/U341F safe? someone told me the trans can handle an extra 50-100 hp. :T

When I was investigating turboing my 2zr-swapped Yaris, I made inquiries at Monkey Wrench racing and Turbokits. The impression I got from those outfits is that the U340 is good for up to 275 HP crank. Frankly, I would be very surprised if it could handle that much power. There was no mention of torque capacity. I bought an SAE paper on the U340E. It gives a figure of 150NM as the capacity which roughly translates to 110 ft/lbs. I expect that's just based up on what the 1.5 produces and does not represent the max capacity. I am not easy on mine, though I don't do burnouts and I installed a thermostatically-controlled fan and cooler. Even under boost the fluid stays in the 180 - 190 range and I have detected zero slipping. I do change my transmission fluid a lot more than recommended, not that it needs it but I like to give it the best fighting chance. Sometimes the shift might be rough when downshifting from OD. I like to manually shift from third to forth as I can keep it in the power band better and it makes for smoother shifting. Sorry, for being so long-winded, but I thought I'd give you my experiences with the trans.