Quote:
Originally Posted by 2muchboost
So I have been doing a little bit of research to get a better understanding of how to properly run 2 sets of injectors. The theory is that a smaller set of "primary" injectors are used under normal driving conditions and a set of "secondary" injectors are setup to kick in at a programmed rpm/boost level/spark....etc.
This concept interests me for a number of reasons but one being fuel consumption and driveability. In the future I will be using my car 2-3 times a week to commute to work (70+ miles a day) in order to give my poor daily a rest. It would be awesome if I could keep close to stock mpg when driving the car under normal conditions and then have a set of upgraded injectors kick in when they are truly needed at which point I would watch my mpg disappear.
I would like to hear from anyone that has done this and what their experience has been like...both good and bad. To be honest I am not hell bent on keeping good mpg on my 240sx because I have a daily but if I could set the car up with a setup like this then I would be interested in possibly doing so.
FYI if anyone cares to know, the setup would be controlled by a Pro Efi 128 unit since its already waiting to be installed.
I have posted a link to SF where one of the members a different setup with his RB30 swap and so far has had great success. I frequently talk to the member there but am interested if anyone here has some insight to further the knowledge. He is running a Walbro 255 at "low" demand and a Bosch 044 under "high" demand.
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There is absolutely no gain to get in using 2 sets of injectors, on our engines anyway. there WAS an advantage before, because big injectors also meant big latencies, but it is not true anymore.
Some engines use dual injector setup, but they are BUILT for that in the first place. Most of these are bike engines that have specs like 15.000 rpm before redline, 200HP/L AND still meet emission regulations.
Your fuel system just delivers the fuel needed, if you deliver less you will just run lean and kill your engine. Want better MPG ? Get an economical engine. There is just no miracle in engine management. You could get slight better MPG by running higher compression ratio, but it also means high octane fuel ( read: use a 1mm HG and e85 fuel )