[ever_green]

Originally Posted by mwebb

$500 for software that does not connect to the car ...
ok
it calculates things based on inputs that are supplied by the user , assuming the software writers did their job correctly ...

the user can see calculations which may or may not be correct or close to correct
neat ? then what ? will you be able to measure or test the results of your tampering to see if there is an improvement in something ? or an UN improvement ?
no you can not not even a little ....

but
imho it is better to be able to measure what is really happening


another calculated value BUT based on inputs from the actual car MEASURED by the software , if you change something the software will MEASURE it and the values will be reflected in the graph or log or whatever
Escan by ats

and

SpeedTracer a no extra charge clingon in AutoEnginuity

yes
both have a learning curve , but both of these software s actually connect to your system and measure changes in your system , modifications can be MEASURED and TESTED

software that calculates but does not measure ?
define educated guess. there are online calculators that guess very well ,
results based on user inputs and the online software calculations.
they are free .

you can not accurately calculate VE at partial load .

Test do not guess .

cool stuff, but this was not about accuracy. this was more about simulations in engine build and the fun factor in it. BSFC was just an example i was giving and nothing to be relied upon. The most interesting thing about this software is learning what affects certain performance aspect of powertrain. ie. smaller diameter/length runners improve low end torque or retarding cam timing can improve top end performance + reduce knock. wasn't trying to or even pretending to actually use data from this system. Even still the torque curve i posted above is a 90% match to the torque curve my vehicle pulled on a chassis dyno. specially the cummins 5.9L which is almost identical to manufacturer specs. 90% coincidence? maybe, but i'm not too sure...