OMP Injectors vented or not?
#26
Big Snail
I spoke to Don at Marvel Speed, Keith at KG Parts, and Ari at Rx7.com. They said to just connect them to a vacuum source on the upper intake manifold. I can't recall if it had anything to do with my 3mm seals.
#27
Lives on the Forum
The vac lines on the OMP injectors need to be plumbed to a filtered source that doesn't see positive manifold pressure. That means either in front of the turbo or to their own dedicated filter. Here's why.
Some other good info in this thread:
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/omp-how-works-modification-amecu-discussion-regarding-premix-60867/
Unfortunately there's some bad info in that thread as well Always seems to happen when an OMP discussion comes up.
Some other good info in this thread:
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/omp-how-works-modification-amecu-discussion-regarding-premix-60867/
Unfortunately there's some bad info in that thread as well Always seems to happen when an OMP discussion comes up.
Last edited by DamonB; 01-29-07 at 04:36 PM.
#30
Sharp Claws
iTrader: (30)
Originally Posted by 93FD3S
I spoke to Don at Marvel Speed, Keith at KG Parts, and Ari at Rx7.com. They said to just connect them to a vacuum source on the upper intake manifold. I can't recall if it had anything to do with my 3mm seals.
unfortunately they gave you bunk info then. it is quite surprising how many people don't know how the oil metering system really works, alot of guys opt for pre-mixing and omit it and never really took the time to understand it.
#31
Big Snail
Ok well for the omp, would be ok to just tee of my wastegate signal line coming from my intercooler pipe just out of the compressor housing?
Originally Posted by Karack
unfortunately they gave you bunk info then. it is quite surprising how many people don't know how the oil metering system really works, alot of guys opt for pre-mixing and omit it and never really took the time to understand it.
#32
Sharp Claws
iTrader: (30)
Originally Posted by 93FD3S
Ok well for the omp, would be ok to just tee of my wastegate signal line coming from my intercooler pipe just out of the compressor housing?
not sure that that would be a wise place to tee into because if your injectors are faulty or the natural pressure being forced back into that line then it could cause your boost level to be erratic. the injectors really should have a port all to themself.
teeing into the wastegate line is always a bad idea, most people do not realize the importance of that one single line.
#36
Original Gangster/Rotary!
iTrader: (213)
Originally Posted by 93FD3S
Ok well for the omp, would be ok to just tee of my wastegate signal line coming from my intercooler pipe just out of the compressor housing?
#37
Big Snail
Thanks Rich....you gotta pic? I know I'm a caveman, I like pictures! :-P
Originally Posted by GoodfellaFD3S
I would definitely not do that for a few reasons. Best to do it the way the factory does, and source atmospheric (not vacuum, lol) air from between the air filter and compressor housing. I just drilled my comp housing (11/64 bit I think?) and tapped it for 1/8th NPT, then threaded in a brass bung bought from pep boys along with some teflon tape. Works like a charm
#39
www.lms-efi.com
iTrader: (27)
Originally Posted by jacobcartmill
anybody know the mazda part # for the stock fd oil injectors?
i did the blow test on both of mine last night (at the same time with the vacuum tee) and they let air in AND out of the housing
i did the blow test on both of mine last night (at the same time with the vacuum tee) and they let air in AND out of the housing
N3G1-14-631
About $25-30 from your neighborhood dealer.
#40
Original Gangster/Rotary!
iTrader: (213)
Originally Posted by 93FD3S
Thanks Rich....you gotta pic? I know I'm a caveman, I like pictures! :-P
Jacob, yes, as I mentioned, to source atmospheric air you'd have to drill into the inlet, if you drill into the compressed side you'd be making a nice pressure source for your wastegate, but not a good choice for OMP injectors or oil filler neck
#42
Original Gangster/Rotary!
iTrader: (213)
Originally Posted by jacobcartmill
should i have my oil filler neck breathing through the stock turbo inlet? i have it hooked up to the UIM with a check valve
#43
Sharp Claws
iTrader: (30)
the three methods all work fine i would say though, you can either put a port prior to the throttle plates, vent them with a vent cap off a spare solenoid or place a line prior to the turbo that is filtered. obviously with the FD and the MAP sensor based system it doesn't necessarily need to be plumbed back in anywhere so long as it has filtered air. on second gen models the metered air is very important which is why they plumbed it back in but why not do it like the FD setup and hook it in prior to the turbo? my guess is either setup works they are relatively similar.
Last edited by RotaryEvolution; 01-30-07 at 09:41 PM.
#46
Senior Member
Originally Posted by jacobcartmill
i ordered a pair of new oil injectors today from ray @ malloy mazda 24.50 a piece.
jacoh
haha.... this is only the beginning LOL !!!!!
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