I already did a search for 'electronic OMP' on this forum and all I came up with was 'MS won't support an S5 electronic OMP'. The threads were sorta old, I was wondering if anyone has made any progress on this front?

If no progress has been made, is it possible to retrofit an earlier (86-88) mechanical linkage OMP without replacing the engine front cover?

 

The bolt patterns dont line up, you need to run the front cover that matches the OMP, unless you want to get creative and machine an adapter.

 

Rotary aviation sells a adaptor by "PCM technologies" that converts the 3 rd. gen OMP to a 2nd. gen mech. OMP. The 3rd. gen elec. OMP has the same bolt pattern as the S5 elec. OMP.It also needs a separate tank to hold the 2-cycle oil.

http://www.rotaryaviation.com/oil_in...p_adaptors.htm (the bottom one listed)

That being said apparently it's not a bolt on affair. The info is in this thread

https://www.rx7club.com/showthread.p...&highlight=OMP

The guy in the thread that's using it sort of talks in circles and it's not very clear in what needs to be done to get it work. But you need an adaptor for the adaptor basically.


Another more promising option is to try one of these. A reverse engineered stand alone OMP controller. The guy is on this forum and goes by "bumpstart".

http://eomp.info/

 

I was working on a converter that takes a signal from the wide-range TPS, a tach input, and the 0-5v input from the OMP, and outputs signals to drive the stepper motor.

However I've had no time in the last several months to work on it at all. I still intend to get it done though, it's just going to be a while.

There are actually a couple of options here though. I believe I could get this working with an ms2 now with just a position table based on TPS and RPM using the built-in ms2 stepper motor driver to drive the OMP. Would people mind being required to use ms2 for this?

Ken

 

A small price to pay for the ability to control the S5/S6 elec. OMP. Sounds like most are moving in the MS2 direction anyway and probably more so since the code is maturing.

Those other solutions I listed above would be more expensive to implement anyways. From what I gather the apexi power FC and more expensive haltech offering (E8,E11) just have the ability to drive the elec. OMP stepper in it's basic state(i.e.2 D map table without stepper position feedback to detect a failed MOP).
I'm sure that would be a welcome addition for S5/S6 MS users looking to keep the elec. OMP .

 

I would gladly upgrade to MS2 for that feature.

 

Ummm you do realise there is already a stand alone controller that controls your eomp if you want it. ?

A Aussie down here made it to really work in conjunction with all the crap microtechs that cant control the eomp. So would work with all other ecu's

here is a link.
http://eomp.info/

 

Having the ability to use MS2's built in stepper controller to run the elec. S5/S6 OMP would still be a much cheaper more compact/elegant solution hands down. The disadvantage is you lose extra output's with an already more limited MS2 (compared to MS1-extra).

 

After I fix the IAC stepper idle control, I'll look into controlling the OMP with the stepper controller using a spare ADC input to sense position.

There'll be probably a 6x6 or 8x8 table with throttle position or load on the y axis, and RPM on the x axis, and position given in terms of % open or closed.

A calibration routine will have to be run to get the min and max.

I suppose there will have to be some time delays too... for example, you probably don't want to increase the oil flow on a quick blip to rev-match a downshift...

Ken