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ST4 sequential transmission


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Anyone running one?

Is the -1.0 staying for 2020 and beyond?

are there any other limitations such as ratios or number of gears, paddle shift, no lift shift?


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  • 4 weeks later...
  • National Staff

There have been no decisions for 2020 regarding this.

One idea that has been proposed by drivers is that in addition to the current Mod Factor, that the Avg HP formula for these vehicles and any other vehicle with high numbers of gears (over 6) be this:

7.2.3 For vehicles with a redline less than 6000 rpm and all Forced Induction vehicles:
The three (3) highest data points of the above sixteen (16) will be used in the calculation below:
Avg HP = Max HP +(sum of the three highest data points)/4

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