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Sorry if I'm cluttering this section up but there is no Fueltech section. Can you keep the stock OMP for a S5 FC with the Fueltech FT550? It says 8 of it's 24 outputs are Push-Pull or Half-bridge and can be used for stepper motor control. Do I just use one of these? Also are these protected in some way so if the OMP fails it doesn't kill the ECU like it does the stock one? Thanks.
So far it sounds like the Fueltech can use a yellow output for the OMP. But I can't verify that will work. I think you also need an input, not sure if it's possible.
I have contacted a mod, really hoping we get a forum. I would love have a place to share answers to this stuff. I've also reached out to Fueltech directly.
I've also heard of an EOMP adaptor by some Australian guy, allows you to run the OMP as a stand-alone with a MAP sensor. Would be nice to conserve ECU inputs.
"to be honest it's not a feature with a high demand at the moment to prioritize development"
So unless you consider a 4 wire conversion using a bunch of outputs with half functionality as acceptable, Fueltech will not run the OMP without outside help.
That "outside help" my be coming soon. Not my place to spill the beans on this bread, but it sounds like we might have full OMP control soon with minimal ECU requirements..
"to be honest it's not a feature with a high demand at the moment to prioritize development"
So unless you consider a 4 wire conversion using a bunch of outputs with half functionality as acceptable, Fueltech will not run the OMP without outside help.
That "outside help" my be coming soon. Not my place to spill the beans on this bread, but it sounds like we might have full OMP control soon with minimal ECU requirements..
I guess premix it is. At least for the short term. Of course at the rate I'm going for my install this solution you speak of may be available by the time I get it in the car.
Rest assured, it is being worked on by a member of this forum. A working prototype has already been made.
Don't ditch the OMP, just add a little pre-mix for the time being. I believe the OMP will inject 50% flow if disconnected, don't take that as gospel but I do believe that is the "no signal" default flow rate.
I can share some details here. It isn't a secret exactly, it's just that I want to make a big roll-up post with all the information in one place later. Also I'm sure the forum has rules about selling products and I have yet to actually go through them to ensure I'm in compliance. So for now, here are the basics.
Everything following is subject to change, although it's basically completed.
I've made a PWM commanded OMP controller. You connect it to a PWM output on your standalone (unpowered, not powered) and make a map based on RPM x Load. Then whatever duty cycle you put in the bins, the controller will follow it. It has complete feedback control using the sensor in the OMP, with a mean accuracy within 0.65% of the commanded OMP opening.
I call it EZ-OMP:
It's not a very complicated circuit, and it would be easily replicated. So I have no problem showing a picture of the board here. The code is the complicated part anyways. An Arduino does all of the thinking, and then I have some additional supporting hardware for a few other features I will explain below.
(The above case is a prototype. I have since altered some print settings for better fit and finish, but it is functionally similar).
The case has changed a little bit since the one you see there, including a clear window for an activity light. The Deutsch DT connector is waterproof. Because demand is unknowable (although it definitely seems to be more than I had expected), I will need to make them to order. I also included a TPU seal to make the entire case water-resistant. I am not calling it water-proof since I can't possibly test each unit underwater, but the unit is designed for in-cabin installation anyways.
There are two M6 mount points so it can be easily attached to an ECU panel or other flat surface of your choosing.
So far it has been tested with an S5 OMP and works great. I am obtaining an S6 in short order to test that as well. It should work with any and all OMPs except Rx8 because I built-in an auto-ranging function, but I won't be promising that until it's tested with the various types.
Feature List:
- Full PID feedback correction.
- Auto-ranges OMP sensor at each startup (should make it compatible with all types of OMP except Rx8).
- Error detection (in case of stepper not reaching target, disconnected sensor, etc) with buzzer for error codes.
- Error light output, triggered with either of the above errors & if board is unpowered when the ECU is turned on (burnt fuse, etc).
- Limp mode output. Connect it to the tableswitch input on your ECU and use it to command a reduced boost pattern if your OMP fails, for example. Triggered when the error light is triggered.
- Park function that moves the OMP to maximum when you turn the engine off.
- Requires only the one ECU output (and optionally the input for the limp mode trigger).
- Deutsch DT connector with included pigtail.
- Water-resistant case.
I started this as a school project and as a solution to my OMP problem, and then at some point I decided to go all the way and make it a complete product, even if it was only me who wanted one. But now it seems like there might be more interest than I thought, so after I finish rigorously testing my work I will be offering units for sale. So far, no prototypes have failed. A hardware warranty will be offered on the EZ-OMP unit and pigtail; no warranty is offered or implied on your ECU, OMP, engine, or anything else other than the EZ-OMP unit. There are far too many variables in play for me to warranty anything other than the unit.
There will be a lead-time, as they will be hand-assembled and made to order. Unless volume is massive and economies of scale kick in, there is no way that having units pre-built will be economical.
I also don't know exactly when they will be ready for sale, as I'm currently finishing my exams and I also work. It's 95% of the way there, but we all know that the last 5% is the most time-consuming.
Price TBD. All of the above may be subject to change at a later date.
Hope this has been interesting. More details to come as soon as I have them.
EDIT:
Oh, here's a screengrab of me datalogging with one of the prototype units:
Finally got my car started, along with the EZ-OMP. Ran some tests to check the flow with the car running, it was easy to go from a smoky idle to clean using just the PWM control. Tuner was impressed as well.
Definitely recommend Christian as a good guy with a good product.
05-29-21, 10:22 AM
Interested!!!
