What we need is more sophisticated graphing (probably no surprise to get a request like this from a technically minded audience). The simplest version graph I want for this occasion would map variance of a selected variable, e.g. fuel compression on the vertical, and I can click on the resultant variables, e.g. economy, to see the effect the different values have plotted. A little more sophisticated version would allow multiple variables to be plot alongside each other, say I might want to find a balance of HP against torque.
I imagine some groundwork is already laid with the plotting of the torque and hp test results, so it's just a case of hooking the variables up, doing a bunch of test runs in the background, and some UI design, right?