If this connection was loose it could/would cause the tune to be lean. If you reconnect it would/could cause the tune to be lean?

I will need to check mine to see if the zip tie is still there and then replace it with a worm gear hose clamp.

Escape of metered air (eg boost leak) will cause a rich condition under boost and a lean condition under vacuum. If you tune for the leak by taking fuel out THEN fix the leak you will get a lean condition under boost .
Adding complexity to this is what your ECU does to try to correct via LTFTs .

Long story short ..... never tune with a boost leak .

FYI: heres a video of what that leak would sound like in the bay..its a pretty distinct sound
http://s6.photobucket.com/albums/y21...306_112522.mp4

hmm... Mine sounds very similiar to that except I was assuming mine was just my intake making that sound:

http://www.youtube.com/watch?v=4LXgI...el_video_title

I'll follow my Jet air hose to confirm its still attached

Thanks Greg . Also added a dyno to the 2nd post to show what the effect on power of this hose blowing off is .

very hard to tell on yours..that greddy intake is pretty noisey

^ Considering that is before I even had teh wheels back on the car I'd guess my hose is still attached (and I still havent hit a positive manifold pressure either). I'll still take a look at it and most likely put a house clamp on it.... Is it possible to get one on it with just the air pump removed?

if you remove the air pump its pretty easy to access

beauty.... Thanks

Brettus that engine bay looks like it could use a wipe down...:rofl:

/\ hehe - was looking at that myself - shamefull . Have not touched it in over a year .

Also see this thread for some additional clips of how it sounded for me. It gave a distinct and annoying whining noise.

https://www.rx8club.com/series-i-trouble-shooting-95/whine-uim-area-208149/

was it ?

I took a look at it but I couldn't see much with the Air pump in place. I would remove it but I have been busy with school lately and I really don't feel like working in my garage in the mid -20C's we've been getting of late. It's supposed to warm up so I will remove my air pump then. I tried to trace the line and to me it looked like it went behind the alternator then took a jog toward the firewall bettween the UIM and LIM near the fuel rail. From there I couldn't follow the line any further with the air pump in place. I noticed the picture of yours with the red circle and could see about the same thing as your picture. Does the Jet air hose make it's way back to that location or did I mess up with hose is which? (pretty sure I didn't but who knows)


Either way I fired the engine up and the only sound I could hear like the videos is coming directly from the GReddy intake. So I am assuming that my Jet Air is still in place; but like I said I have not hit any positive manifold pressures yet and my car is currently parked until the snow melts off the roads.

the hose you are tracing toward the fuel rail is the OMP line.

THANK GOD for this thread and thank you NGO.... So I went out and looked again and I traced the hose which I thought was the OMP line and it meets up with the Steel line exactly where the picture dictated (still connected). So turns out I had my Jet Air hose and OMP hose mixed.... on the plus side should be an easy fix.

Also I believe this little swap should not have affected my Data logs for Jeff at all. Any opinions on this? I was hoping to get my next map on tuesday or thursday when he does the Live chat sessions. I am still on the base map so I only have a log at idle and cruise (no boost, no WOT).

So OMP saw boost and jet air would be leaking back into intake under boost . Should not be a dramatic effect on logs but obviously better to get it right . Don't forget the ziptie on the hose in the red circle :).


Also - do you need to change your post on the first page showing which hose is which ?

Yup post fixed ... and I will be hose clamping the jet air thats for sure... it lookes pretty easy to reach with the air pump gone. And yeah my OMP would be seeing boost had I gotten that far haha.

Yeah I realize the logs are better if the hoses are proper but I just can't get another log right now and was hoping that it wouldn't make a big deal so I could get a 4.01 log from MM on tuesday. I'll have to take it up with him during the session to be 100% clear.

Okay so I swapped around my Jet Air hose and OMP hose.... now I am getting a loud whining sound from the intake. Upon further investigation it is coming from the line on the top of my intake closest to the front of the vehicle; the line has a large amount of suction at idle... wtf is going wrong here? The line that is making the whining is the OMP breather line as it goes behind the alternator and then toward the back of the bay between the LIM and UIM near the fuel rail.

Here is a video:

http://www.youtube.com/watch?v=Jxc498WVMPk

nothing to do with the tee you have going to the boost solenoid ?

Dont believe so... I mean you can clearly hear the noice stop when I was blocking off the OMP hose so.... The OMP hose is supposed to be under vacuum at idle right?

ok - yes there is vacuum from mine as well but only a very small amount nothing like what you are getting .

Damn... no suggestions for that hey? The suction on mine is not that strong... but you can hear it when I put my thumb off and on the end... I guess I can try and go screw around with it some more

It didnt start making that high pitched noise untill the car was warm too btw

It could be to do with a faulty oil injector - some kind of resonance vibration from the check valve maybe :dunno:

Others have had the same noise apparently - the Greddy intake does not muffle the sound well .

Well it seems odd that it would just start doing that after I swapped the hoses; and I don't have a check valve on the OMP line, or any line for that matter.... What are typical OMP values read from the AP during warm idle... I could monitor those I guess. Will I need a check valve on the OPM line? will it see positive pressure?