I'm trying to write a math channel for throttle speed in AIM Race Studio. In Bob Knox's book, he says that the equation is:
(deriv(Throttle Position)/Max Throttle Position)*100 I've tried this plus multiple variations on it without success. Does anybody know the correct formula? Thanks.

 

Make sure you are using your actual channel names. Make sure you are using your actual channel names.

 

The actual channel name is THROTTLE_POS When I test the equation, the software says that some part of Max THROTTLE_POS is wrong. Have written max or MAX or Max with or without a space between Max and THROTTLE but nothing works.

 

Maybe max(THROTTLE_POS)

 

Your formula seems wrong to me. If your max throttle is 100, which I assume it would be, then this equasion (deriv(Throttle Position)/Max Throttle Position)*100) is really this deriv(Throttle Position). Is this what Bob Knox is looking for? Explain what you are tring to see on the graph.

 

I'm trying to see the speed that throttle is being applied as expressed by the % of full throttle per second. Jorge Seeger's book says that throttle speeds should be less than 150%/sec

 

OK, I looked at my data and saw that my Throttle was max at 107%, so my formula is deriv(THROTTLE/107)*100. Your formula was similar but maybe the parentheses was in the wrong place. Go to RS 2 Analysis and open the test and go to Math channel. Go to the functions box and double click "deriv". This will put up the equasion "deriv(ChanOrVal)". Inside the parentheses delete the "ChanOrVal" and leave the cursor there. Now go to "Identifiers" box and double click your identifier for throttle. Now inside the parenthesis devide throttle by your max throttle value, in my case it was 107. Then multiply everything bu 100. It should look like this deriv(THROTTLE/107)*100. I've attached a couple screen shots to help clarify:

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Yep, that worked. Thanks for your help.

 

On this subject: what kind of info do you try to extract with that channel? How smooth you are with your right foot? Isn't it hard to make conclusions with data?

 

In my opinion you can't be "too fast" coming off the throttle in a straight line breaking zone, so I don't agree with a max 150% off throttle, if that was Jorge's intention. Going to full throttle is dependent on the power you have, but I do agree that you can be "too fast" adding throttle and 150% seems to be a good place to start.

 

Jorge's recommendation for keeping throttle speeds less than 150%/sec is for medium and high powered cars exiting a corner but before the point they will accept full throttle.