What should I do with this hose?

[GTRSOAR]

Hey everyone, quick question: I put in a hard piping kit in my R32 GTR and ever since my boost has dropped from .9Bar to .6Bar. Other symptoms are it drops down to 0 Rev on the Tach and juuuussttt about stalls until it revs it back up to 1000rpm every time the clutch it held in. I checked all my clamps and bolts and everythings tight. I suspect I may have capped off a hose I shouldn't have. On the stock intake system there is a small hose that plugs in to the intake pipe after the MAFS and on the new hard piping kit there's no place for it so I capped it off. Should I have done that or should I tee it off another vacuum hose/open it to atmosphere? Thanks in advance for your help!! Desperately trying to fix this before RevScene!

The kit completed:


The hose I capped:



Where it was on stock intake piping:



Should I tee it in to another vacuum hose or is it fine capped like this? Thanks in advance everyone!

[GTRSOAR]

Anyone?

[sharpshotta]

https://sites.google.com/site/tyndag...agram.rev3.JPG this might help

[GTRSOAR]

Ya the vacuum control tube. Does this still need to be connected to something or can it be capped? Anyone know what this controls?

[jrhdohc]

it's part of stock boost controller.

stock boost control:
hose A from intake plentum goes to actuators to limit boost.
hose B T'ed from A goes to boost soleniod. soleniod opens to bleed air and raise boost.
hose C exits soleniod and runs to intake (can't be bleed to atmosphere because AFM already counted it and thinks it's enroute to engine).

the hose you have capped is C. by capping it you prevent the soleniod from increasing boost. basically turns off the stock ecu boost controller.

don't know why it's stalling probably lack of air flow by passing the turbos thru the system or leak somewhere else.

it needs to be connected between AFMs and turbos.

[jrhdohc]

does your new intake have BOV recirculation?

[GTRSOAR]

Excellent, thanks so much!! Wheres the best place to connect it between the AFMs and turbos??

No it does not have BOV recirc, im running I have a Tial BOV

[GTRSOAR]

If it normally runs into the intake to bleed off pressure, if I let if bleed off to atmosphere wouldn't that be the same thing or should i still Tee it between AFMs and turbos?

[jrhdohc]

best place is stock nipple. haha...
i don't know... maybe weld a new one? or remove all you stock boost controls and replace with aftermarket electronic one?
Blow-off to atmosphere might cause your stalling.

[jrhdohc]

if it bleeds to atmosphere your AFR will be out of wack.
AFM measures air. so if air pass thru it. computer puts more fuel into the engine. if you let the air out via a leak... the compute doesn't know... and still puts in the fuel

[markc32]

id put it back on the same spot somehow...that hose u blocked needs vacuum/pressure to the boost solenoid

[GTRSOAR]

Hmmmm, no idea how to tie in that hose to a coupler :S

[jrhdohc]

hope you can work it out.

stalling is from BOV. once the boost controller is operating. higher boost will making the stalling issue worse.

i would 1. put everything back to stock or 2. switch to speed density.

[GTRSOAR]

Took me 23 hours to put it on, not touching it haha. Whats speed density? If I put the hose back to a vacuum line it should be just the same as stock, no?

[jrhdohc]

only works between AFMs and turbos.
anything after the trubos are vacuum/boost lines. you can't bleed boost into boost.