My FDR is about 5.1 (ish) I am running 17.5 though so the 13.5 boys will run higher. With my car on Blinky I just change my FDR to get a little more top end or acceleration. On our track acceleration is key as its so twisty, with one short straight it is a waste to gear the car for that, although I try to be at top speed around 60-70% along the straight.
I use 64dp gears to allow fine adjustments to change my FDR as usually even just changing the pinion up or down one tooth makes a noticeable difference.
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