Rb20 boost problem - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

lovethatpssh · 03-24-2015, 07:54 AM

Was boosting 14 and Boost and vaccum where working fine thenTheexhaust pipe coming from the turbo broke lose got it welded and now no vaccum at all and doesn't even boost 5 psi dk wht else todo

Mikester · 03-24-2015, 08:27 AM

Wastegate stuck open or flopping freely due to disconnection from actuator arm.

Dboyizmlg · 03-24-2015, 09:53 AM

^^ that right there

lovethatpssh · 03-25-2015, 08:59 AM

Thank you.... And Not to sound stupid but whts the best way to fix

Mikester · 03-25-2015, 11:28 AM

Connect the actuator back to the wastegate. There is a little c-clip that holds in on.

lovethatpssh · 03-27-2015, 12:43 PM

I've looked At mine I don't see and actuator rob or anything sorry if I sound like I dk wht Im talking about I'm lost tho

lovethatpssh · 03-27-2015, 12:49 PM

Here's a picture of it

lovethatpssh · 03-27-2015, 12:51 PM

Here's a pic

Mikester · 03-27-2015, 10:40 PM

Kinda hard to tell from your pic- Looks like an external wastegate (no rod/flapper door on those)...? Check that your vacuum lines etc going to it are properly connected and that there isn't any leaks in the connections/flanges/gaskets. I've never run an external wastegate; so other than the basics, I have no other wisdom to offer. I know the theory of operation is pretty much the same; meaning that something is either not connected, stuck in the open position or otherwise malfunctioning- The reason you aren't building boost is that the wastegate is most likely allowing all of the exhaust flow to bypass the turbine. Sorry dude.

Mike

cotbu · 03-28-2015, 09:11 AM

That looks like the worst place to put an external gate. If it every worked you'd have to worry about, the divided flange, and having shitty gaskets.

I wanna see what the exhaust side of the turbo looks like, now. Maybe I'm wrong and this is the best place for an external gate.

Sent from my Highly Tuned Note 4.5!!!

lovethatpssh · 03-30-2015, 02:44 PM

Here's another

Yellow4g63 · 04-01-2015, 09:47 PM

Stock RB turbo?

Sileighty_85 · 04-02-2015, 12:21 AM

Might have a leak somewhere, Look at your fire wall, the plastic wire loom cover is melting

seagrasser · 04-02-2015, 10:08 AM

We need more basic information.

What turbo are you running (stock or aftermarket)
When you say exhaust "broke loose", how did that happen and what parts broke loose. What was welded, be specific.
Looks like an aftermarket wastegate and exhaust setup, please describe it or take better pictures.

Sounds like you are not building pressure, so that means either a leak or the wastegate is stuck open. There are any number of reasons for this, especially if the exhaust suffered a catastrophic failure at or near the turbo flange.

lovethatpssh · 04-07-2015, 02:47 PM

I fixed it it was actually just the boost gauge wasn't reading the hose had a crack replaced and everything's fine... But just in case. 57 trim Garrett turbo hks exhaust. And it broke loss from the turbo.

03-24-2015, 07:54 AM	#1
lovethatpssh Join Date: Mar 2015 Location: Hickory Age: 29 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	Rb20 boost problem Was boosting 14 and Boost and vaccum where working fine thenTheexhaust pipe coming from the turbo broke lose got it welded and now no vaccum at all and doesn't even boost 5 psi dk wht else todo

03-24-2015, 08:27 AM	#2
Mikester Nissanaholic! Join Date: Jun 2007 Location: Kathleen, GA Age: 50 Posts: 1,941 Trader Rating: (0) Feedback Score: 0 reviews	Wastegate stuck open or flopping freely due to disconnection from actuator arm. __________________

03-25-2015, 11:28 AM	#5
Mikester Nissanaholic! Join Date: Jun 2007 Location: Kathleen, GA Age: 50 Posts: 1,941 Trader Rating: (0) Feedback Score: 0 reviews	Connect the actuator back to the wastegate. There is a little c-clip that holds in on. __________________

03-27-2015, 10:40 PM	#9
Mikester Nissanaholic! Join Date: Jun 2007 Location: Kathleen, GA Age: 50 Posts: 1,941 Trader Rating: (0) Feedback Score: 0 reviews	Kinda hard to tell from your pic- Looks like an external wastegate (no rod/flapper door on those)...? Check that your vacuum lines etc going to it are properly connected and that there isn't any leaks in the connections/flanges/gaskets. I've never run an external wastegate; so other than the basics, I have no other wisdom to offer. I know the theory of operation is pretty much the same; meaning that something is either not connected, stuck in the open position or otherwise malfunctioning- The reason you aren't building boost is that the wastegate is most likely allowing all of the exhaust flow to bypass the turbine. Sorry dude. Mike __________________

03-28-2015, 09:11 AM	#10
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 47 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	That looks like the worst place to put an external gate. If it every worked you'd have to worry about, the divided flange, and having shitty gaskets. I wanna see what the exhaust side of the turbo looks like, now. Maybe I'm wrong and this is the best place for an external gate. Sent from my Highly Tuned Note 4.5!!! __________________ LoverTechnologies "Half Broken Things!"

03-24-2015, 09:53 AM	#3
Dboyizmlg Nissanaholic! Join Date: Aug 2011 Location: SoCal (I.E.), San Berdino, Colton, Redlands Posts: 1,666 Trader Rating: (17) Feedback Score: 17 reviews	^^ that right there

03-25-2015, 08:59 AM	#4
lovethatpssh Join Date: Mar 2015 Location: Hickory Age: 29 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	Thank you.... And Not to sound stupid but whts the best way to fix

03-27-2015, 12:43 PM	#6
lovethatpssh Join Date: Mar 2015 Location: Hickory Age: 29 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	I've looked At mine I don't see and actuator rob or anything sorry if I sound like I dk wht Im talking about I'm lost tho

03-27-2015, 12:49 PM	#7
lovethatpssh Join Date: Mar 2015 Location: Hickory Age: 29 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	Here's a picture of it

04-01-2015, 09:47 PM	#12
Yellow4g63 Zilvia FREAK! Join Date: Jan 2003 Location: Socal Posts: 1,451 Trader Rating: (5) Feedback Score: 5 reviews	Stock RB turbo? __________________ 95 240sx RB20 415whp 91 Nx2000 VVL yo

04-02-2015, 12:21 AM	#13
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	Might have a leak somewhere, Look at your fire wall, the plastic wire loom cover is melting __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

04-02-2015, 10:08 AM	#14
seagrasser Zilvia Member Join Date: Nov 2011 Location: Lynnwood WA Age: 46 Posts: 256 Trader Rating: (2) Feedback Score: 2 reviews	We need more basic information. What turbo are you running (stock or aftermarket) When you say exhaust "broke loose", how did that happen and what parts broke loose. What was welded, be specific. Looks like an aftermarket wastegate and exhaust setup, please describe it or take better pictures. Sounds like you are not building pressure, so that means either a leak or the wastegate is stuck open. There are any number of reasons for this, especially if the exhaust suffered a catastrophic failure at or near the turbo flange. __________________ S14 RB25

04-07-2015, 02:47 PM	#15
lovethatpssh Join Date: Mar 2015 Location: Hickory Age: 29 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	I fixed it it was actually just the boost gauge wasn't reading the hose had a crack replaced and everything's fine... But just in case. 57 trim Garrett turbo hks exhaust. And it broke loss from the turbo.

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