Engine Analyzer Pro with Pictures
 

Engine analyzer pro is an engine designer for professionals and engineers to simulate engine dynamometers. I have been playing with this sim for about a week now and have had surprisingly accurate results. Now i must warn people that are interested in such software that EAP is very tedious and you need to know a LOT about your engine to get some accurate results. Also its an expensive piece of software. One main reason i'm using this software was to estimate the brake specific fuel consumption or BSFC for my cars (there are a lot of information that this software can provide, BSFC is only one of many). With EAP You basically edit information such as your short block, heads, intake, exhausts, cams/valves and turbo/supercharger. Then you can get your end performance results after the software analyzes this information. this is just a page from the cam/valve spec section that i filled out:

http://img841.imageshack.us/img841/6362/eap1.jpg

once you enter the information required as accurately as possible then you can calculate the peformance.

EAP analyzing the engine (dyno):
http://img845.imageshack.us/img845/9238/eap2.jpg

and here is what i got for results on brake specific fuel consumption, brake torque, fuel flow and volumetric efficiency:

http://img844.imageshack.us/img844/9238/eap2.jpg

BSFC alone:
http://img51.imageshack.us/img51/6362/eap1.jpg

so according to this simulation my brake specific fuel consumption (SOHC 2.5L impreza) is lowest at 2200-2400 rpm during wide open throttle. I know it's all a simulation but its pretty interesting still. Also there are a lot more information that EAP provides such as knock index, brake horse power, cylinder pressure, exhaust pressure and so on...

if you provide me with information such as your cam timing, valve sizes, valve lift i can estimate a result for you. i really like to see one for a honda insight so i have something to compare against, since insight is so well documented BSFC wise.

Q: does that EAP software allow you simulate engine conditions other than WOT, such as part-throttle, high-loading, highest gear--ie: hypermiling?

no unfortunately only wide open throttle simulations are available.

It just so happens that 2320-2800 rpm = 1000-1200 ft/mn piston speed.

Wow, I would LOVE to have that software to tinker with!

yep its a lot of fun and if you know what your doing and read the 240 page manual its accurate too. you can download the trial or the older version for free if you google a bit. ill be working on the gm 1.4l turbo and a 1.8l honda next.

Ah... no version for Macs. guess I'll have to dust off the old laptop!!!

ok here is one with cummins 5.9L with truck diesel fuel

http://imageshack.us/a/img20/8915/cummins.png

compared to official results:
http://ecomodder.com/wiki/images/1/1...9-175_BSFC.gif

I think usually the case is that peak BSFC is at a slightly lower rpm than the peak BSFC at WOT. Your peak WOT BSFC is at ~2000rpm, which is a really slow engine speed! Peak BSFC might arrive at something like 1900rpm and 85% of that torque.