Originally Posted by
Slapmaster6000
Well.... I admit that I do not do anything to the motors short of an air hose, but this whole speedo nightmare is hair pulling.
With the Duo's, you get your choice of 0, 10, or 20 as they are fixed drilled holes in the end bell. Since the holes are drilled roughly 3mm apart, my only choice would be to run the 10* time hole. Since I have not seen a "profile = timing" chart for the SPX, I will test with your recommendation. Since it sounded as it was going to blow the foam off of the wheels, it should be safe to assume that r/o is going to have to be quite a bit lower.
The 13.5 Duo certainly did not preform correctly set at 0* @ #7 rolled at 67 or 64mm in my experience.
Brian
This may not be right, but it's working for me so far...
When you go with the increased timing, the motor becomes more power than torque, so you need to drop the gearing. On 0deg motor and 0deg timing, my 10.5 runs at about 58 mm/rev. It's OK all round the track, but lacks top end on the straight.
The more timing I add, the more top-end I get and the lower the ratio gets. At the last big race, I was running 2.5mm advance on the motor, and No 7 on the (LRP) speedo. The ratio was down to 51mm/rev. Above that, the car was slow to pick up out of corners. Also, when the advance is high, I notice that the batteries also make a difference, with my best packs being noticeably better than my worst ones. This difference goes away when you have no timing on the motor/speedo.
This might be helpful, but YMMV. HTH
