This works fine on the stock tune or even most SCT base files but not on my tunes.įor example say you went to 3.73 gears from the stock 3.31's, at 55mph you used to be doing around 2300 rpm's but now with 3.73's your doing nearly 2600 rpm's. When you update your tunes using the user options on both SCT and Diablosport products it is simply changing the Speedometer settings and correcting this part of the equation. So now your transmission shifts faster, depending on the new gear ratio how much faster. Now when you update your gear ratio this changes everything for the shifting as the MPH points remain the same but the engine RPM at that MPH point is different. The shift points are set mainly by MPH instead of RPM, except at WOT. "As I'm sure you know if you have my automatic tunes my shifting is entirely different then that of the stock tunes or even the SCT or Diablosport base files. Here's what Doug from Bamachips says about changing gears with his auto tunes: Suggest that you contact Brenspeed to see if your car needs either the current tune to be updated, or a new tune. Give your tuner a call let him know your changing gears.he will send you a new tune. Not changing the shifting will feel like the car is shifting sooner at like 39mph at a pedal position of 540. The same thing will have to be done to the torque converter table. It will be necessary,for proper upshifting and downshifting to ratio the table (mph vs PP) upwards for the new gears. The reason is at 49mph your engine rpm will now be 6751rpm at a pedal position of 540 this has to be done for each upshift and downshift. With the stock gears at a pedal position of 540 and 44mph the engine rpm will be 5991. The second screen shot shows the shift points for a stock rearend gear. The first screen shot is where the "axle Ratio Switch" must be turned off. Here are two screen shots for automatic tranny truning. Click to expand.Changing of the gears in the x2 or x3 will only allow the speedo to read correctly.
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