12-07-2018, 10:11 PM
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CC Member
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Join Date: Apr 2007
Cobra Make, Engine:
Posts: 1,009
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Quote:
Originally Posted by Sawdust
Awesome result guys, congratulations! Well done.
I notice after each run after you cross the finish line you "flick" a toggle switch at the bottom of the dash. What are you turning off?
Stu.
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That is the switch that arms the on board engine data acquisition. He turns it off so it does not re-trigger and over write data from the run. We monitor throttle opening, fuel air ratio, drive shaft speed, drive shaft acceleration per .1 sec, traction control intervention, spark advance, RPM, MPH, intake air temp and water temp. We use the data mostly for setting traction control parameters but also look at air fuel ratios and peak rpm. We have another system that monitors G loads, GPS speed, position on the course, and average speed. Both are time based so we can see where on the course we are getting excessive wheel spin or less than expected lateral or fore and aft G loads. For example, we got about 1.4 lateral G with viper fronts on all four wheels but our acceleration dropped about .1 to .2 vs Bridgestone rear tires.
We backed to back on Friday and found that the four Kuhmo's were faster than the Kuhmo/Bridgestone combo ( which only pulled 1.3 lateral G) by about 1 second.
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