at what points does it pump? Is it a set rpm window? is it a set throttle posison? Can some on shed some light for me?

 

It pumps from the minute the engine starts, but it changes depending on the signal sent form the ECU. from playing with a OMP from an FD it seems to get data from ECu related to TPS, and Boost sensor.

but I still don't have it all figured out as when we were playing with it its volume is so much lower than the old mechanical OMP's that its hard to tell visually the difference in volume its pumping.

 

your saying that the pump is always pumping. So does volume increase with tps % and boost preasure?


Do you think you could make the electric omp function if you were to give it a voltage signal that increased ar rpm's increased? And would it work on a liniear scale?


Im in the market for an EMS and most of then do not have provisions to controle an electronic omp. So i am trying to figure out a way to build a sub controler for the electronic omp.

 

Its like a drop of oil every 30 mins, its crazy. Also to think that the Rx8 consumes one half less oil.

 

im not worried about amount of oil just yet im more worried about what to tap off of, like a tach signal or whatnot, to actuate the pump. And if its a liniear value of how much is pumped. Say if @ 1000rpm x amount of oil is pumped then at 2000rpm is 2x amount of oil pumped. Not worried just yet about what x is.

 

I would guess not that exact more between. 1,000-6,000 rpm + time at the RPM = x
Then 6,001-redline + time at that RPM = X

Its ALOT of variables.

 

fatman do you know what variables i will have to figure out to get this working?

 

Honestly alot, but from my understanding time (how long your at a certain RPM), temps, boost, and I think one or two more things.

 

do you think that if i could figure out how much oil is injected with each opening of the injecter for a car that premixes and used that formula i could figure out how much oil to inject at each point?


Also what is the usual ratio for premixing on a full tank of gas and how mcuh gas will a full tank hold?

 

A Full tank
FD=20 gallons
FC=16 gallons

Mind if I ask you why you would like to do this? The mix is Im not sure, but its barely anything, a few oucnes per tanK!

 

well when i get my project up and going i would like to put a 13b-re in my s4 and run a standalone ems. And if im not mistaked the 13b-re runs an electric omp and most ecu dont have provision to controle and electric omp. I think the haltech e11 is the only one, and that seems to be more ecu than i need for my application so im not gonna run out and drop $2000 or what ever the e11 cost when i can spend $1000 to $1500 for a microtech lt8 or a haltech e6x which dont have the provisions.


Now i know that premixing is a well proven and well accepted way to keep the apex seals lubricated. But i dont alway run my tank all the way to empty and fill it completly up every time i need gas. So i dont want to spend the time figuring out how many gallons i got and how much oil i need to add. Plus carry'n the funnel and oil and towels around just seems like a hassel to me.

While if i can figure out the formula to make an electric omp run, i have enough friends that know computers that i can have one of them program me something simple to run it. The i just build a case for the chip and circut board, wire it in and go.

Then once i have a controler buy the rotary aviation adaptor to have the omp feed off of an external source. Build a small oil tank (maybe a 1/2 quart to a quart) because i have all the provisions to easily build my own for under $15.

Then with the omp computer and external resivour all's i need to do is check the oil level in the tank whenever i check the engine oil and top it off it needs it. No math no nothing.

And i want to figure all the formulas out before i get started on my project so i can put it into my budget. And becuase i always like to do alot of research before i jump into stuff.

So anything on the subject is really help full, and thanks for you input so far fatman.

-matt

 

If you do a search for premix you will find something. I was recomended 200:1 for normal drivng and 150:1 for the track.

-Destin

 

thanks destin

 

that would probably work out just fine...
i've seen an engine that was run 3 FULL WEEKS with absolutely NO oil injection whatsoever!!
this engine was overheated, so i swapped it out for the guy.

to my shock, when i pulled it apart, the internals looked nearly PERFECT!!! wear on the irons and rotor housings was standard, no burned apex seals, everything was in order....


what i'd suggest doing is getting that sump kit from rotary aviation. use a reservoir, and pay close attention to how much oil you're using. you can then add a potentiometer or resistor to your voltage line to limit the flow if you're using too much.

 

would there be any adverse affect to to much oil?

 

Drops your octane leve a few points (1 or 2 maybe 3 most) and harded to ignite so maybe a bit of hesitation or bogging, but to bog it would have to have ALOT of oil.

 

well i did more research and bassicly i found out that it is better to premix so i thing im just gonna have to drop my project.

for any one that was interested this was very informative http://www.fc3spro.com/TECH/FAQ/premix.html


What realy swayed me was about the lack of pressure that the omps pump at and the lack of coverage they speak of.

Thanks for all you help though guys.

 

the compression of the engine helps distribute the oil and helps convert it to a mist.

if you don't believe me, pop out your egi fuse and pull the spark plugs while a friend cranks the engine--you'll see a very fine mist of oil and air shoot out.

 

GUITARJUNKIE28 thanks for the extra info man.

 

no problem.

i wanna see someone make this work...

 

For those concerned about premix and ratios, it's not an exact science. Close is fine. And you don't have to drain your tank each time... just learn where your gas gauge points and how much to put in.

For me (88 SE), half tank is about 6-7 gal, so I put in an 8oz bottle. Quarter tank takes about 10 to fill, so I put in a 12oz bottle. Not difficult.

-=Russ=-

 

GUITARJUNKIE28, if you can figure out exactly how the electronics on the omp work i have all the reasorces to build and program a controller for it. I just need to figure out when its on, how long its on, how much volume it moves, and so forth. If you can get a hold of this info, ill make it work.

 

if you can get me an s5 to play with for a week, sure. i can datalog 4 voltage inputs at the same time... i'll just log the **** out of it, then put all the info together.

i need to correct myself though... i was tired when i was talking about how the oil gets misted....

it's really the vacuum of the engine--not the compression. it's basically the same effect as the venturi on a carburetor. i can't explain things for ****...i got my head up my *** today

 

hey man post in you regional forum and see if some one with and s5 will let you log it. And we can go from there.

 

i would, but i've got an fd and 3 fc's i'm working on right now... just not enough time to actively pursue this idea.