Fixed timing and electronic dynamic boost timing
 

Hi all,

I have a question about the endbell can fixed timing and esc boost timing. When we get a modified motor like the Hobbywing G3 4.5T from the shelf, it usually comes with 30° of fixed timing or so.
In modified onroad racing most of the time racers use settings like 4° of boost and 43° of turbo which add up to the fixed timing value.
What I'm wondering about, is why using such an amount of fixed timing when we know that in the low RPM range it will induce a much less efficiency and more heat, where we could rather use a small fixed timing value and a greater boost value so that the ESC will dynamically apply it across the RPM range improving efficiency and performances ?

It's usually less efficient to go below 30 degrees endbell even at low RPM. Most of the time I see settings with such small boost and a lot of turbo is for tracks with a really tight infield where more boost just gives too much power making it harder to drive. I'm usually using around 10 boost and 20 turbo for the tracks I drive on.
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Thank you for your answer. I don't get why this is less efficient to go below 30°? In my view having so much endbell timing means your commutation is way off the motor neutral plane at low RPMs thus generating more heat.

How many times are you coming to a complete stop in a race? Hopefully not often. You're probably still doing 5k+ RPM at a minimum in the slow sections. The neutral plane deforms once the motor starts spinning which is generally why you see 20-30 degrees minimum for timing.

All right thanks for this info.