Originally Posted by
Graham Because the only way you can get the timing correct is to have the rolling road hold rpm constant as you adjust the timing to see what gives best power, before moving onto the next load/speed site you are going to, on the road if you adjust the timing the engine speed will go up or down so you are no longer on the same part of the map you are trying to set.
when mapping the higher load and speed sites you do a power run, then make a second power run with a timing adjustment, and over lay the two results so you can see exactly where the engine did and didnt want the change, again, something you cant do on the road, on the road you can only guess at the timing or advance it until it pinks, which isn't very satisfactory and certainly you will never get the best out the engine, and quite possibly destroy it in the process!
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