For a project I\'m working on. Looking for any information I can get hold of, as I want to build a standalone driver for an oil memtering pump.
Anything you\'ve got would be much appreciated :Thumbsup!
They look like a standard stepper 7.5 Degree - 4 wire drive
the maps I have seen on my haltech ECU are based on the TPS position and look very linear and uncomplicated.
Rotary aviation do an external supply pump for the oil pump. I think it is very linear to revs !
Shaun
Cheers guys, that\'s exactly what I wanted :wiggle
Is the position sensor there to simply let the ECU know that the thing is functioning correctly, or does it play a larger role in oil metering? I can\'t think of a reason it would, or there wouldn\'t be much sense in using a stepper motor. The sensor looks like a 360 degree potentiometer from the wiring diagram.
I\'ll try and get a scope to it while it\'s running on the stock ECU and see what goes on.
Do the old school mechy ones work on revs and TPS, revs alone, or TPS alone?
Thanks again
Ian
Quote from: ianelvarCheers guys, that\'s exactly what I wanted :wiggle
Is the position sensor there to simply let the ECU know that the thing is functioning correctly, or does it play a larger role in oil metering? I can\'t think of a reason it would, or there wouldn\'t be much sense in using a stepper motor. The sensor looks like a 360 degree potentiometer from the wiring diagram.
I\'ll try and get a scope to it while it\'s running on the stock ECU and see what goes on.
Do the old school mechy ones work on revs and TPS, revs alone, or TPS alone?
Thanks again
Ian
Ian - I think they work off an actuator rod connected to the throttle body, but pump driven by engine RPM - so somehow possible that the oil amounts are a function of both RPM and Throttle position.
Your correct about the position sensor - it\'s just a pot - I think it\'s purpose is in checking the metering point on the OMP and if it doesn\'t register correctly the engine is put in limp home mode.
Perfect, I think that\'s all I need to be going on with. Cheers dude :Thumbs-up
Came across this a while back when looking into Premix - describes the OMP systems a bit :
http://fc3spro.com/TECH/FAQ/premix.html (http://fc3spro.com/TECH/FAQ/premix.html)
Upto the 2nd gen 13b EGI the pump was a mechanical one so only ran off revs.
Shaun
yes but the linkage to the throttle varied it by how far the throttle was open as well. There are specs for the 1st gen in the haynes manual (for checking purposes)
Ah right, Im going to need to investigate this for my new engine..... Going to use the double barrel 12a one on the 13b with a home made pickup on the new throttlebody.
Shaun
this is the linkage from a 6 port (converted to be actuated by the spindle on a 48 dellorto)
(http://i6.photobucket.com/albums/y219/MikeLMR/Stuff%20For%20Sale/DSCF0294.jpg)
Cool :D
Shaun
Thanks again. It looks like it\'ll be fairly easy to drive, I just need to work out how it\'s mapped.
As an aside, do many people convert the OMP to inject 2 stroke oil from a seperate oil reservouir?
I\'ve never seen that done over here - but the yanks have a neat little gizmo that fits between the OMP and the block, effectively prevents engine oil from getting to the OMP, and a nipple on the device allows a secondary oil source just for the injectors on the rotor housings.
linky here : http://rotaryinsider.com/rx8-93.html (http://rotaryinsider.com/rx8-93.html)
Quote from: ianelvar;404187For a project I\'m working on. Looking for any information I can get hold of, as I want to build a standalone driver for an oil memtering pump.
Anything you\'ve got would be much appreciated :Thumbsup!
just trawling,, and i noticed this old chestnut
i teamed up with my electronic fiend friend and went there
,, this is the result
The Electronic Oil Metering Pump Controller - And other technical errata.. (http://eomp.info/)
primarily,, it was aimed to help those with s4 car, dash and ECU,,
wanting to run the s5 block direct ( with injector ballast bypass )
without the multitudes of issues encountered in trying to rig the s5 ECU or retro-fitting the s4 timing cover
but also at those with LPG,, wanting to run the variable EOMP of late blocks
( i myself was forced to a mech pump and timing cover conversion when i first went LPG )
if you are still looking for the info\'s ,, all these years down the track -
i can relate to your the mechanism by which mazda went about to use this
-- and also the crude info i have for the map it used related with rpm and load
-- some of it is mazda bulletin,, others SAE and also anecdotes from ken
Very nice bit of kit. Did you ever think of making it in to a kit ??
Shaun
Quote from: shaunwil;606038Very nice bit of kit. Did you ever think of making it in to a kit ??
Shaun
unfortunately,, not a lot of demand for a device that saves $$$ on timing cover swaps,, ECU exchanges
-or gets around the outboard 2 stroke smoke joke at every fill !
- too many just blank it,, or ignore it,, and just top up the oil lots
( if left defaulted )
or just pull down the blinkers when joe public laughs at them
---cause they add oil to the petrol at the servo
we can make them on demand,, or to order for other purposes,, on a one is one private basis
( entirely hobby assembly )
-- to show what its capable of,, we have a 5a version capable of running the TRC blade on supra engines
( ie,, follow the TPS, but self adjust at low rpm to set point idle ,, and interact for throttle cut on high boost and overrev=== IE LPG !!! )
-- so its not all EOMP,,.,, theoretically you could use it to dial in torque split on your audi
---or any other device that uses feedback stepper control
Its very cool. The FB has a 12a cover on the 13b engine running on LPG and this would have enabled me to keep the original cover and Oil sump and welded in some mount adapters. Would mean not needing an ecu to control the OMP and have the car running on a conventional carb.
Shaun