2 Stage Boost Solenoid

[STAGE-A]

Hey everyone .. after readin bout the black wire trick i looked into a bit more and found an easier way ( connecting the 2 pipes together job done!!) and yup sure does work.

question .. as we dont have the factory boost guage its impossible for me to monitor if thats givin me the same boost as what there doin with the black wire .. now im assuming its just another way of achieving the same thing (there tricking the solenoid to stay open all the time, im jus by-passing it ..if im right no probs but if not ouch!!

soo have any of you done this the way i have or see any reason why this is a bad idea or any other reason why this shouldnt be done at all.

im asking this here due to the fact ive been reading alot of your posts over the last few weeks and respect your opinions.

appreciate any input

cheers Lee

[Sydneykid]

Sorry, I am not sure what the question is exactly that you are asking. The wastegate actuator spring on the Stagea is designed for ~0.25 bar (4psi). So if you feed boost direct to that it will open at 0.25 bar (4 psi) and that is the max boost you will get. The standard boost control solenoid bleeds off 0.15 bar (2 psi) back into the inlet. That's how 0.4 bar (6 psi) is achieved.

This is what I wrote in a post on the Jaycar IEBC and DFA thread ......

This is the 10 minute no cost boost to 0.5 bar rerouting of the vacuum hoses. Disconnect the two vaccum hoses from the solenoid. Then connect the boost feed (from the cross over pipe on the left of the picture) to a the standard T piece. Connect one side of the T piece directly to the wastegate actuator (on the right of the picture). The remaing connection on the T piece goes back into the inlet via the BOV return pipe (on the standard fitting). Make sure to put the the standard brass restrictor in that vacuum hose to bypass the desired amount back into the turbo inlet. The standard bypass hole of 1.25 mm bypasses enough air flow for 0.5 bar.

I hope that answers your question

cheers

Edited December 27, 2005 by Sydneykid

[STAGE-A]

ok .. i think ive achieved the same thing, im positive its boosting a lot harder than 4psi. just really not sure if its boosting too hard.

heres what ive done .. simpy joined the 2 pipes together (the top and bottom pipes that went into the boost solenoid).

i have read posts where people are doing all sorts of different variations of modifying this but some are finding its sendin the boost right up to bout 20psi.

Is it possible from the way i have done it to be runnin that high?

Before it felt debatable as to it even being turbo ...now no mistaking it, does this sound normal? can just a few psi make such a significant difference?

Sorry makes it a lil hard as i only found out where the boost solenoid was last night, and the wastegate actutaor i still have no idea.

cheers Lee

[StageZilla]

ok .. i think ive achieved the same thing, im positive its boosting a lot harder than 4psi. just really not sure if its boosting too hard.

heres what ive done .. simpy joined the 2 pipes together (the top and bottom pipes that went into the boost solenoid).

i have read posts where people are doing all sorts of different variations of modifying this but some are finding its sendin the boost right up to bout 20psi.

Is it possible from the way i have done it to be runnin that high?

Before it felt debatable as to it even being turbo ...now no mistaking it, does this sound normal? can just a few psi make such a significant difference?

Sorry makes it a lil hard as i only found out where the boost solenoid was last night, and the wastegate actutaor i still have no idea. 

cheers Lee

<{POST_SNAPBACK}>

i suggest a boost gauge before u do any major damage, it could be running without a wastegate line and be free boosting, you never know, though my old rb30et from 6-10psi was a huge difference in power and made 6 psi feel like half throttle (seriously).

[Sydneykid]

ok .. i think ive achieved the same thing, im positive its boosting a lot harder than 4psi. just really not sure if its boosting too hard.

heres what ive done .. simpy joined the 2 pipes together (the top and bottom pipes that went into the boost solenoid).

i have read posts where people are doing all sorts of different variations of modifying this but some are finding its sendin the boost right up to bout 20psi.

Is it possible from the way i have done it to be runnin that high?

Before it felt debatable as to it even being turbo ...now no mistaking it, does this sound normal? can just a few psi make such a significant difference?

Sorry makes it a lil hard as i only found out where the boost solenoid was last night, and the wastegate actutaor i still have no idea. 

cheers Lee

<{POST_SNAPBACK}>

Hi Lee, big mistake. From what you are describing there is now no restriction in the bypass line (the one that goes to the turbo inlet) so a whole pile of boost is being bypassed and therefore not going to the wastegate actuator.

Standard, the restrictor is in the line out from the intercooler return pipe, there is a red stripe on the vacuum hose to mark where the restrictor is. Nissan use the restrictor to dampen the boost hit. This is a picture of the vacuum hose with the red stripe on it.

To get around 8 psi, the restrictor needs to be in the vacuum hose that goes to the turbo inlet. That's the vacuum hose fitted to the LHS of the T piece in the following picture;

The vacuum hose on the RHS of the T piece goes to the wastgate actuator, that vacuum hose (in the picture) has a yellow stripe on it.

Cheers

[neostagea]

i was contemplating doing this mod while working on the car today and when i removed the air box cover i discovered that there was a vaccum hose which had a bolt in the end of it <_<

on looking at SK's pics the hose coming from the pipe on the left is connected to the right of the t piece where the hose with the yellow line is connected. and the hose with the yellow line on it has a bolt on the end of it.

i have no idea what this could be doing??? do any of you know if this could cause any longterm damage as i have no idea how long it has been like this

any advice would be appreciated

[STAGE-A]

cheers SK, ive put it back to stock.. but will be fittin a boost guage today so will try again after that when i can monitor it ... will post back some results

Lee

[Sydneykid]

i was contemplating doing this mod while working on the car today and when i removed the air box cover i discovered that there was a vaccum hose which had a bolt in the end of it <_<

on looking at SK's pics the hose coming from the pipe on the left is connected to the right of the t piece where the hose with the yellow line is connected. and the hose with the yellow line on it has a bolt on the end of it.

i have no idea what this could be doing??? do any of you know if this could cause any longterm damage as i have no idea how long it has been like this

any advice would be appreciated  

<{POST_SNAPBACK}>

The hose with the yellow stripe on it )in my picture) goes to the wastegate actuator. If this is not connected then there is no boost control. Which sounds unlikely, so I suggest you check which vacuum hose is actually connected to the wastegate actuator.

cheers

[neostagea]

thanks SK i have got this sorted now