I looked at the vaccum diagram and it shows that the oil metering nozzle tubes are hooked up on the compressor side of the turbo on a stock turbo system.

I searched and found one thread on this issue, but it wasn't real clear on what to do. Alot of people do different things. One ran them to the throttle body,some people leave it un capped/un hooked up. Some people cap it?

1. Will oil get sucked up the vaccum tube? I have the nozzle out of the car, and i sucked on the nipple where the hose attaches on top, and it seems to pull air thru the two holes on the side. Does the oil from the omp go thru these holes,so that means theres a path for the oil to go up the top,especially if there's a vacuum to help it also.


There's 2 tubes that are on the LIM on the side of the fuel rails are, near the bolts that the secondary rail bolts to the LIM. Could i use thoses for a source of vaccum? I belive they get capped anyways.

 

Ideally they should be set up like the stock system. Either tap the compressor housing where the filter mounts or put a nipple in the filter. They need a constant source of vacuum and the only place for that is before the turbo. Everywhere else sees boost.

 

Thanks, Do you know where i can find a nipple that i can mount into the intake coupler? I could just install one nipple and T it off to both, that would work?

Can oil get sucked thru this and into my intake, then thru my turbo?

 

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


Cliff notes:

Oil injector nipples need filtered ambient air. Not vaccum.
Convenient spot for this is pre-turbo.
Pre-turbo is not a vacuum source.

For those that will say turbo inlet is vacuum it is not. I've made that mistake in thinking in the past...it's in the link above. "But I put my hand over the inlet and I feel the vacuum!" That because you're creating a restriction to the flow which creates the vacuum. Just like a throttle plate in an intake. Remove the throttle plate (open it wfo) and you get atmospheric pressure in the intake. A diesel engine that runs with no throttle plate (no restriction) does not see vacuum in the manifold.

 

+ 100 million

I have tried to explain this in many threads. I have even torn apart one of my oil injectors to verify that there is nothing other than a simple check valve inside. I even calculated how much vacuum you would likely see in the stock primary intake elbow at WOT (it was negligible).

BTW, you should not be able to suck air from the top nipple. The check valve has failed and you need to buy a new oil injector.

 

IIRC, the rear nipple on the LIM went to the stock FPR

The nipple pointing towards the front of the car needs to be connected somewhere that sees boost, but before the throttlebody. It has something to do with injector/fuel atomization. I don't recall its exact function, I just hooked it up as it was stock.

 

If you decide to pull filtered air from the turbo inlet you could probably use a fitting like this:

http://www.atpturbo.com/Merchant2/me..._Code=ATP-FTG1


I just used a pair of those small filters from the stock rats nest solenoids. I simply attached a filter on top of each oil injector with a short piece of silicone hose.

 

Those work great.

Also, people are probably going to get confused by the link above and think you're telling them to plug boost pressure into the injector nipple.

 

Hmmm... yeah I guess those pics could mislead some people. Don't install the nipple in the compressor outlet as shown in the pics. It needs to be installed in the turbo inlet to source filtered air.

Or you can source filtered air somewhere else. Whatever is easier for people.

 

Thanks for the link and info. I like the idea of the small filter from the stock rats solenoids, I'm gonna go that route.

Also, It seems people tap a nipple on the coupler that holds the intake on the single turbo(pre-turbo) for a source of vacuum for a oil catch can. So i shouldn't run my oil catch from that spot since there's no vacuum.

 

IMO that just seems like a good method to insert oil into your turbo intake.

I'm not convinced that there is any benefit in applying vacuum to the "crankcase" on a rotary. Tons of people (including me) run a catch can that is simply vented to atmosphere. If you want to get even more complicated you can route a drain line back into the rear oil return on the engine.

Having said that, there will be a SMALL amount of vacuum in the air filter under WOT (due to the filter's flow restriction and increased velocity of the air). It is negligible when compared with the vacuum seen after the throttle plates.

Think about a vacuum gauge on an NA car. Do they see vacuum with the throttle open? NO