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-   -   Greddy turbo - correct connection of vacuum hoses - don't stuff this up!!!!!!!!!!!!! (https://www.rx8club.com/series-i-major-horsepower-upgrades-93/greddy-turbo-correct-connection-vacuum-hoses-dont-stuff-up-211884/)

9krpmrx8 04-05-2011 03:24 PM

So how do i know if my kit is the newer kit?

RotaryMachineRx 04-05-2011 03:26 PM

There will be a nipple on the chargepipe that goes to ur TB that the JET Air hose connects to.

RotaryMachineRx 04-05-2011 03:27 PM

it is circled in Brettus' first post somewhere

Chris 04-05-2011 03:41 PM

on the charge pipe near where it couples up to the throttle body there will be a nipple coming off for the jet air hose. My kit is an older kit thus it didnt have this nipple originally, however, the previous owner decided to weld a hidious nipple which is the wrong size too :(

FazdaRX_8 04-05-2011 03:58 PM

I have a top mount, but my jet air is hooked to the charge pipe right now, I am thinking of adding a check valve, to see if it changes anything, cant decide if intake would have more pressure then right at throttle body. It still could be a leak of sorts.

Chris 04-05-2011 04:31 PM

if you are connecting jet post turbo then you shouldnt need a check valve. we use the check valve to keep the jet air from blowing air back into the intake pre turbo

RotaryMachineRx 04-05-2011 06:14 PM


Originally Posted by RWD+LSD=Zoom (Post 3935810)
if you are connecting jet post turbo then you shouldnt need a check valve. we use the check valve to keep the jet air from blowing air back into the intake pre turbo

exactly :yesnod:

FazdaRX_8 04-05-2011 07:27 PM

IF the jet has more pressure then the throttle its a boost leak, or reverse flow, possiblie shooting fuel right at throttle body

RotaryMachineRx 04-05-2011 09:17 PM

^^ I'm trying to find the drawing I had earlier with no luck; but where does the jet air hose tie into? I would Imagine that the pressure before the throttle body is always greater than the pressure in the manifold and it shouldn't matter as the direction of the pressure difference will always be away from the intake.... but i'm still looking for that damn drawing to see if I even make sense haha...

FazdaRX_8 04-05-2011 09:24 PM

On mine its on the bottom center of the lower intake maifold.
If preassure is leaking back to the throttle body, its a boost leak. If the throttle body has more pressure then your boosting the manifold directly, helping mix fuel.

I just cant decide which is the case.

RotaryMachineRx 04-05-2011 10:16 PM


Originally Posted by FazdaRX_8 (Post 3936096)
On mine its on the bottom center of the lower intake maifold.
If preassure is leaking back to the throttle body, its a boost leak. If the throttle body has more pressure then your boosting the manifold directly, helping mix fuel.

I just cant decide which is the case.

I'm not sure if we're saying the same thing or not but with the Jet air hose connected to the LIM, just from basic fluid mechanics there should be more pressure upstream (i.e charge pipe just before the TB) than downstream (i.e LIM) because of pressure drops (losses) in between the two locations. Meaning there should be no need for a Check valve if you have your jet air hose hooked to your charge pipe as flow will always be going from larger pressure (Charge pipe) to lower pressure (LIM). Although the difference between the two would be miniscule.

Chris 04-05-2011 10:28 PM

thats the basic idea, however, with running more pressure (connecting jet air to charge tube "boost") you run the risk of blowing the jet air tube off at different connections. This is what this thread is all about. be sure to either put zip ties or clamps on the connections.

RotaryMachineRx 04-06-2011 06:51 PM

Hose Clamps to be more safe

warren(silver-roxy-8) 06-10-2011 12:05 AM

quick question, what hose connects to the nipple on the wastegate actuator? reviving 2 month old thread ftw.

Brettus 06-10-2011 12:32 AM


Originally Posted by warren(silver-roxy-8) (Post 4001462)
quick question, what hose connects to the nipple on the wastegate actuator? reviving 2 month old thread ftw.

A . None of the above


Answer 2 : It depends



Will you have a boost controller ?

warren(silver-roxy-8) 06-10-2011 08:01 AM

^^I will not have a boost controller

wcs 06-10-2011 11:20 AM


Originally Posted by pdxhak (Post 3880745)

Great thread Brettus, Thanks everyone.
I would just like to point out that to me ....... on my computer this picture represents the OMP hose (White stripe) being connected to where they are suggestion the Jet hose (Yellow stripe) should be connected.

I thought this was suppose to be Greddy's updated instructions lol, or it's just the picture being rendered poorly on my machine.

Love to stay and chat off to read the OMP thread by MM.

NgoRX8 06-10-2011 11:49 AM


Originally Posted by warren(silver-roxy-8) (Post 4001615)
^^I will not have a boost controller

wastegate actuator to turbo outlet


Originally Posted by wcs (Post 4001822)
Great thread Brettus, Thanks everyone.
I would just like to point out that to me ....... on my computer this picture represents the OMP hose (White stripe) being connected to where they are suggestion the Jet hose (Yellow stripe) should be connected.

I thought this was suppose to be Greddy's updated instructions lol, or it's just the picture being rendered poorly on my machine.

Love to stay and chat off to read the OMP thread by MM.

took a look at the manual online. and zoomed in on it. it is yellow. haha

warren(silver-roxy-8) 06-10-2011 11:51 AM

another thing, I connected the one way check valve hose (originally goes from the bottom of the throttle body to the to the vacuum chamber) to the nipple of the blow off valve. thoughts on this? also, there is a green sensor connected to the VFAD solenoid valve. What does this sensor read?

warren(silver-roxy-8) 06-10-2011 12:15 PM


Originally Posted by NgoRX8 (Post 4001856)
wastegate actuator to turbo outlet

turbo outlet=compression pipe c-1? (that's how greddy instructions label it)

NgoRX8 06-10-2011 12:22 PM

yes.

and your bov signal should not have a check valve

warren(silver-roxy-8) 06-10-2011 12:36 PM

ok. any recommendations as to where the bov hose should be connected?

StealthTL 06-10-2011 12:41 PM

BOV signal comes from the VFAD nipple.

The green 'sensor' in the VFAD line is the solenoid valve to send the vacuum signal to the VFAD.

Chris 06-10-2011 12:43 PM

just incase you need this info: the vfad nipple is on the bottom of the UIM just after the TB.

warren(silver-roxy-8) 06-10-2011 12:49 PM

^^ok, so just to make sure I understand, the VFAD nipple is located post throttle body on the underside of the UIM and all I need to do is remove the check valve hose and replace it with a "regular" hose. as for the green sensor, that is safe to be unplugged as there will be no vacuum signal to send because there is no VFAD?


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