of course it will!
i stop and help people whos cars have broken down all the time!
wait a minute, no i dont. an old HQ, yes. a new SS? ha ha. efi, ecu, plastic fantastic. ill help you push it off the road.
fabian, you love to make things complex. nothing personal, so do i at times.
efi is not simple at all. why do all mechanic shops now need this fancy gizmo called a scanner, and most apprentices these days wouldnt have a clue on how to do anymore than fit a turbo and remap the efi on a dyno? its oil changes and filter changes now. hard to find a mechanic that can tune by ear these days. try finding someone to dial in a stacked set of 42mm mikuni CV carbs on a 4 cylinder. it requires knowledge and feel. and some patience too!
it is simple and reliable when its a stock setup, in good trim. its a nightmare when anything is modified or custom! its used predominately as an efficiency thing. though now its performance is up there! once again, EPA rules and all that
. twostrokes are notorious for being ineeficient/dirty. so efi just wasnt ever really developed in that direction.
(havent checked out dragsters for a while...what do they use? carbs or EFI? not sure...)
lets see now... EFI...fuel pump. regulator. plumbing. injectors small enough to be precise. injectors need cleaning, and when you only have one... hmmm. two stroke engine, still needs oil.
varying oil ratios affect viscosity therefore flow rate therefore throwing off all the calculations based on injector flow. dealing with microseconds of opening time, to deliver precise quantities of fuel! has to be accurate! it either needs to be injected or you have to be exact when mixing. each and every time.
two stroke has a fuelling delay due to crank induction which (if an O2 sensor therefore feedback is used) leads to an unstable mixture as system overcompensates, then under compensates. injector would need to be direct cylinder injector. then hows the oil get in the crank? requires a "dry sump" like a harley. with an oil tank. that one forgets to top up occasionally. same deal when injecting the oil. level needs monitoring. still doesnt cure the fact that some oil will be sucked into the cylinder, which leads to the dirty factor again.
still havent considered the electricity to run the processor or pump. that needs to be present before the engine can start, so you will need a battery. relevant wiring and switches. a generator as the fuel pump is going to chew the power up once running!
standard o2 sensors get gummed up by twostrokes. putting one in the exhaust port will affect pressure wave formation in any exhaust fitted and get gummed up.
a tuned pipe will really mess up any calculations used by the processor cus thats airflow it never considered that is next to impossible to measure or predict!!
all of this to be available for next to nothing, or at least the price of a whole engine kit.
(look up sarichs orbital. if you have never heard of ralph sarichs...shame on you! call yourself an aussie? i say this so you cant say "but isnt there a two stroke injector system in use?" yes, theres a few, invariably semi mechanical, not true EFI.)
you can buy cheap kits for the thumpsters now.
http://www.ecotrons.com/Small_Engine_EFI_PNP_kit.html
maybe worth experimenting? 399 US for the basic is pretty cheap!
i wont be the first
used to be $2000+. honda and everyone elses love of efi has helped with small efi systems becoming feasible.
but, lets move onto the software, the mapping!
either you calculate every possible variation, and spend years tweaking each point on a dyno until the system is bulletproof and ready for the general public. air temp, rpm, TPS, O2, plus many others in complex systems! knock sensors! head temp! fuel temp! oh. crank angle sense is a must.
i looked into this years ago, before it was so commonplace. yes, about a decade ago..
i found this...
http://rjhowlett.complexnet.co.uk/papers/2004-2.pdf
contacted dr howlett himself, and that led into what software he used...
basically, i downloaded the trial software, and with two simple variables, rpm and manifold pressure, i got this type of map
it looks AMAZINGLY like a standard sort of efi map! and, with only a few variables, with only a few "steps", calibration/tuning is a breeze! any fool can tune it! with a smart phone, possibly, (OS dependant)on the fly!
its not calculating a definite value and storing it in memory to be accessed when that situation arises like in real EFI, which takes time and computing power, then modifying those points via PC and dyno, its more a system of..."its near this point more than its near that point, so ill turn this on for about this long". very easy to implement...in theory! very hard to actually write code as puters dont like "sort of" as an input!
so. software was easy to use. everything looked great to go. what processor to use? lil baby PIC14F82 or similar. easily programmed, cheap and useful. used in everything these days!
the software even has a PIC compiler, for programming the thing. they do use a unique command system, with only 32 instructions. saves a lot of brainpower! have you ever played with boolean mathematics? tried tripling in binary? or even, converted simple hexadecimal to binary? and octal pops up occasionally. decimal? whats decimal? you need to know these things to program a pic chip! and then theres all that logic
with parity and checksum bits and extra bits on a byte as its a 12 bit D/A converter that get carried to ..... its a big learning curve. i gave up on it after a bot or three. learnt the basics but.
so, i got a quote for the software, didnt i? the freebie trial download wont actually compile code, of course.
8000 Euro for a CDrom in the mail. and a black box
not really worth it for my use...
end story.
