Resource

I've been doing some searching and it says this will cause the ECU to go into to limp mode. Is this true? How can I fix this besided putting the OMP back on?

I have the Power FC.

Thanks!

rynberg

Why in the hell would you remove the OMP?
You do know that the OMP lubricates the apex seals, right? The PFC doesn't have a "limp home" mode, that is only the stock ecu.

People who rely only on pre-mixing for apex seal lubrication do so because they either have a haltech ecu or they can't afford to replace a bad omp.....

Please explain your reasoning behind removing the OMP.

Resource

I get rid of everything I don't need. If adding a little premix will help clean things up and save a few pounds then I'm all for it.

Thanks for cursing me.

ejmack1

hahahah....

rynberg

are you laughing at me or Resource?

Resource: I'm trying not to sound insulting but it seems really, really dumb to remove the OMP just to save a few pounds. To totally rely on pre-mixing just seems risky to me, which is why I would never consider using a Haltech ecu.

sub-zero

I have a PFC and had to remove My OMP also because the Guy who made My mani thought I was running Haltech and made the mani without enough room for the OMP. After reading lots about it I think it is not that bad as I will run synthetic oil and wont be injecting dirty oil, plus premix will lubricate the seals better. Not much weight savings though.

Resource

Not risky at all. Premix actually does a better job at lubricating than the OMP.

rynberg

Could you provide any evidence to back up that statement? I notice several of the tuners recommend running pre-mix IN ADDITION to the OMP. If running pre-mix only was superior with no negative side effects, I would think it would have become as common as installing a downpipe. But it hasn't....

Resource

Because removing the OMP doesn't add power.

rotorbrain

the omp does too good of a job at lubing the apex seals to get rid of it. the weight savings is minimal. you cant beat variable oil pumping for our applications. pre-mixing is a pain. why not get the omp block-off/adapter for it. that way you can run 2-stroke oil and keep the omp. go to www.rotaryaviation.com and look around. youll find it. i have it and so does another guy (garfinkle) out here in tennessee. it works great as we use amsoil 2-stroke. . . no ash. that is by-far the best street setup IMO.

paul

VTECthis

iTrader: (4)

None of you think for yourselves do you? Did you ever think that the cylinder temps are high enough to burn the oil upon contact with the inside of the combustion chamber? The OMP is a total waste. It does nothing and anyone who thinks it does is not thinking. Mazda made a futile attempt at lubricating apex seals, its a flaw of the motor design, you cant lubricate them properly. All premixing does is dilute the gasoline to a lower octane. Stop listening to other people and think for yourselves. Everyone on this forum just repeats whatever theyve heard over and over. If your car is running like butt, it probably has nothing to do with the OMP, since i know of more than a few cars you probably know of too which dont run the OMP at all and dont run premix either.

rxrotary2_7

not to get into another debate about pro-premix or not... but resource, your reason behind removing it is retarted IMO
rotorbrain, the adapter you speak of is for a mechanical OMP, so its not a direct bolt-on but i still agree its a good idea.
vtechthis, i do think for myself most of the time, but some things MAZDA thinks of and i rely on that. i believe you are mistaken in your theory. if you were correct, then i am sure mazda must haev not spent a ton of money on R&D in that area. OH WAIT! i think they did! doesnt the new renisis motor have 2 oil injectors per rotor housing now? HMMM... there must be for a reason. how many apex seals in history have chiped off corners? i am going to say A LOT! spreading the lubrication across the entire seal *could* help with this and *may* be the reason why they are tring to lube in a more spread out area instead of directly over the middle of the apex seal. premixing could help also. not in the cruing around mode as the fuel is only entering on one side of the rotor until higher rpms where both sides would be lubricated.
oh, and how many octane points does premixing drop the final octane number? i want to hear what you have to say. i would guess at most 2 points?...

Marshall

Would you care to share your wisdom on how a 2 stroke engine gets part of its lubrication?

rxrotary2_7

i am with you on this one... how would premixing ONLY be *better*? as i statted in my last post oil is now only being injected via the intake ports, which is ONLY the primary, only one side of the seal/rotor/chamber (whatever you want to say) durring idle or cruising around under light duty, low RPMs. wit the OMP stil inplace PLUS premixing, would you not have 2/3 of the seals being lubricated?

rxrotary2_7

rynberg

I notice from your profile you are a student. Keep studying.

I'll take your advice. Starting with you....

ejmack1

Geeez rynberg, chill. If you have seen Resources car... there is nothing non-essential on it... All HE wants to do is remove it to reduce clutter, extra hoses, and weight(might be minimal but **** adds up). He asked a question on whether it would cause problems, he never posted to be questioned upon why he did it....

rynberg

A lot of people remove things from their car for dubious reasons. Newbies follow suit thinking it's ok. I just wanted to know why he would remove something important to the health of the engine. I asked for evidence why removing the OMP and pre-mixing works BETTER than the OMP and haven't heard anything. I'm not asking to bust his *****, I'm asking because I'm always trying to learn more about the car.

In my experience, when people are asked for evidence of something and they get defensive, it means they don't have any......

rxrotary2_7

i have seen it. engine looks nice and yeah the turbo is impressive but anyone can have that... we are talking about the same guy right? the one running 24ishhh LBS of boost on a stock map sensor and running all this through stock rails but ran -10 line to a rail tapped for 1/4NPT... https://www.rx7club.com/forum/showth...hreadid=168384
maybe he used a dented rotor or scored housings durign rebuild after blowing up the first time (that i am aware of) at the track? ask InitialD FC about dented rotors and scored housings. https://www.rx7club.com/forum/showth...hreadid=170073

paw140

This is perhaps THE most ignorant post I have ever read on this forum. Congratulations You don't have any clue, do you? Metal-on-metal surfaces need lubrication. Have you ever run a two-stroke motor without premix? It won't last very long.

13brv3

How do you figure that only one side gets lubricated when only the primary injectors are operating? Does the fuel and air stay on one side of the rotor housing too

There's really no end to the OMP vs premix debate, but since either works fine, who cares. The only real downside to the OMP is that it can fail, lines can break, etc. If you premix, YOU can fail by forgetting to add the oil. It really boils down to whether you want to take responsibility for the oil, or trust the system.

Another thing to remember is that Mazda has no choice but to use an OMP. This doesn't mean they believe it to be superior to premix. It only means that they won't sell many cars if people have to premix. They would also get tons of warranty claims when people forget to add the oil. I'm sure Mazda knows which method is better, and I'd love to see their findings.

Cheers,
Rusty
'93 R1, OMP and 4oz MMO per tank
'03 RV-3B aircraft, turbo 13B, premix only

rxrotary2_7

lets say lubricated well. is does burn up and is entering on one side...

rotorbrain

rxrotary2_7, they are offering ones for electrical omps as well, BUT (and i forgot to mention) the omp does have to be altered if using twins. im running single so it slipped. sorry about that. its a nice piece though. very much worth it.

paul

black99

I agree, it looks "ok" but way too many newbies jock it like it's grape illusion cool-aid. But they do that to just about anyone who has a huge turbo and is supposedly making huge power.

Now that's just messed up but it's not suprising.

jumprdude

Really? From the subject line you started this thread with, you'd almost conclude otherwise.