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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.
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Q: does that EAP software allow you simulate engine conditions other than WOT, such as part-throttle, high-loading, highest gear--ie: hypermiling?
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no unfortunately only wide open throttle simulations are available.
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It just so happens that 2320-2800 rpm = 1000-1200 ft/mn piston speed.
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Wow, I would LOVE to have that software to tinker with!
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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.
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Ah... no version for Macs. guess I'll have to dust off the old laptop!!!
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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.
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the new 3.9 version apparently supports part throttle calculations and variable valve timing
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hmmm no
$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 http://farm3.staticflickr.com/2481/5...aa23e08b_b.jpg 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 http://farm5.staticflickr.com/4032/4...30a4b021_b.jpg 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 . |
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no input for aerodynamics
no input for aerodynamics on a chassis dyno or the engine calculation software
you can learn a great deal from scan data when viewed in real time before and after a tampering event most tampering reduces FE and power output in the real world you will never know this unless you have a way to measure it you can not measure it with out the correct tooling . you can not guess accurately the software predicts results based on expensive changes to the engine in your car changes that will most likely result in problems and reductions in every thing that is good .... then what .... can you un ring the bell ? it is time consuming to learn theory and then implement it successfully it is impossible to do if you do not have a way to evaluate in real world conditions what you have changed $400 dollar software VCDS Knock retard per cylinder and exhaust gas temperature per bank VW R32 2008 at wide open throttle pass http://farm8.staticflickr.com/7226/7...682cc2d7_b.jpg or graph any other parameter ID from the menu which software will provide a way to actually test modifications in the real world .... test ? or guess ? the choice is clear. |
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It is no substitute for testing an actual working engine, it is a complement to that. It can help you avoid dead-ends when trying to spec out an engine setup that you want to build. Once it's built, then you can test and tune and optimize. -soD |
i know mwebb i have a bit of tunning experience with hondas and subarus. i have seen friends use escan and speedtracer. but they have a totally different purpose compared to EAP. apples and oranges....its like saying dont use a flight simulator just hop on the plane and do it old school.
dave i couldnt agree more. |
no - you can not test and tune and optimise
no
the average joe can not test and tune and optimize engine internals they have no clue how to disassemble then reassemble an engine from a car built later than around 2000 , let alone the tooling . so for the average joe the software you are promoting is right next to useless , worse than that it may / will cause people to begin projects that can never be successful because the average joe has no theory and no tools to use the info that may be gleaned from the software and to apply it to his car and because the software in his car will be angered by his tampering and he will not be able to comprehend why , should he get the whole mess running again , however unlikely that really is . on the other hand scan tool software can measure simple modifications to intake / exhaust / aerodynamics / suspension to verify improvement or lack thereof and it is much more likely that the average joe can apply that data to his tampering along with the limited tooling and level of theory that the average joe has imho this forum is or appears to be all about the average joe they average joe would be better served spending the dollars on tools and scan tools and studying up on theory BEFORE delving into re engineering the engine in his car . pain is a good teacher but it is better to learn the lesson without the pain |
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