I'm talking the fuel injector air bleed and the OMP lines that normally go to the spider. I had my OMP spider line blow off, causing a screwy MAP sensor reading and detonation. It would be less hose to blow off under boost, and they aren't supposed to see actual vacuum anyway right?

 

No. One reason being that it will cause a vaccume leak after the MAF so the car will try to idle too lean. As well, under boost it will probably blow air and probably a fair bit of fuel out through the breather filter. it's just not going to work good in any aspect.

 

OMP injectors run on fresh air though, not vacuum? So if you blocked off the nipple on the back of the UIM and open vented the oil injectors it seems like it would be ok (except for the small possibility of debris getting in there I guess). But that's only if the air that goes to the oil injectors does not go into the runners at all.

I'm not sure what effect open venting the injector air bleed line would be. Does that run on vacuum, vacuum/pressure , or just fresh air?

And I am running a standalone btw with no AFM.

 

Both of them run on at the very least pressure, I would have to look up which barb by the throttle plates is what before I could figure out if they use vaccume or not. The bottom line is that these are there for a purpose... and if your vaccume lines are hard and brittle from 20+ years of service than replace them. I have never had a new vaccume line blow off on me. Don't try to fix a system that works, just replace the worn out components.

 

The oil injectors themselves SUCK air into the rotor chamber, FROM the spider who gets FILTERED AND METERED air from the thottle body nipple.

There is no suction from the spider i.e the throttle body. Vacuum is FROM the oil injector. Did I already say that?

The answer is no to the threads question. If a filter was installed then it would be a vacuum leak i.e. unmetered air entering the rotor chamber. I think that was said in a post above.

 

He has a standalone, so the unmetered air issue is not a problem as I understand it.

I am very interested in this discussion myself (hence my .02 being thrown in)

 

It's unmetered air.

 

Yes it would be despite the fact that he's on a standalone.

IMO, just ziptie the bitches on. You're running 20psi - it wouldn't take many bumps/vibrations/3rd gear pulls to slip one loose.

Maybe they were ziptied? In that case, wipe a little RTV on the nipple, then slide the hose on, then zip tie. I've never lost a hose using that method even up to 25psi on a GT3574

But I wouldn't mess with venting them - vaccum leak city IMO.

 

stand alone's meter air via pressure, not velocity. air leak means loss of pressure meaning wrong values being read compared to what the engine is using.

simple really.