I am looking to ask a question of someone who has a real working knowledge of EFI.

My question is this: what would be the maximum injector size that EFI live could accurately control? There has to be an upper limit where either the smallest increment to the pulse width adds too much fuel or each pulse width becomes inaccurate (too much then too little...random).

My thought is this: since I have EFI live, the next time I do and injector change I'm thinking to add the biggest injectors possible to give the most opportunity to do whatever: race, tow, etc.

 

I cannot directly answer your question on how big, but I know people are out there running large sticks and fuel limited tunes while they save up the cash for compounds. And I'm not talking for a month, I'm talking the tune is such they could run the large sticks for good. Then when they get the air they add the fuel. No more pulling your sticks if you do a air upgrade, just change the tune.

 

That's what I'm thinking to do. I wonder how big is the biggest nozzle out there. Any ideas?

There still must be a limitation though...it's not like you could install injector tips the size of McDonalds drinking straws. (I'm lovin' it)

There has to be a resolution size in EFI - the smallest increment, also a lower limit and an upper. Been tempted to just buy it...an engineer/mechanic in Calgary has a dyno and said if I got EFI live he'd learn on his own truck then tune mine for free.

 

Its very cost effective to contact someone custom tuning now, you will get your truck dialed in after a few data log runs and they know what they are doing. You might want to PM ATP, chances are they have already done what you are referring too and can advise you. Also remember very small sticks with all your air can make huge numbers. I don't know what you are looking for but trips change things immensely. 700+ has been done on little old 90's, .

 

Yeah, I can understand that. I'm trying to follow the old adage of "measure twice, cut once".

I've made too many goof ups on my truck because I didn't research enough. My Carli starter suspension is a good example...nice upgrade but I feel every crack in the road...now I'm trying to figure out how to best upgrade to a smoother rise.

I have no idea where I'm going with the truck HP so I'd rather go too big and tune it back than be disappointed with performance and have to re-purchase and waste time reinstalling.