RB20 boost leak? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

SilS13Coupe · 11-01-2009, 06:20 PM

My friends RB20 has a boost leak, he turned up the boost to about 18psi and then the manifold came loose.

Can anyone help with the problem? Where would be the couple of places to check?

Thanks

kushlivin · 11-01-2009, 06:41 PM

the manifold maybe. intercooler piping/mount.bov,etc,etc...

SilS13Coupe · 11-01-2009, 06:52 PM

Quote:

Originally Posted by kushlivin

the manifold maybe. intercooler piping/mount.bov,etc,etc...

Yeah, pain in the ass to check every single place. He says the boost gauge will read its boosting, but its not boosting at all.

Sileighty_85 · 11-01-2009, 06:56 PM

Quote:

Originally Posted by SilS13Coupe

My friends RB20 has a boost leak, he turned up the boost to about 18psi and then the manifold came loose.

Can anyone help with the problem? Where would be the couple of places to check?

Thanks

I dont understand your question/ Problem... Which manifold? intake or exhaust????

so the manifold came loose cuz of boost causing a boost leak?

Maybe you should tighten the manifold back down..... sounds crazy but that just might fix your manifold

SilS13Coupe · 11-01-2009, 07:02 PM

Quote:

Originally Posted by Sileighty_85

I dont understand your question/ Problem... Which manifold? intake or exhaust????

so the manifold came loose cuz of boost causing a boost leak?

Maybe you should tighten the manifold back down..... sounds crazy but that just might fix your manifold

He says exhaust mani came loose and when he bolt it back on it wouldnt boost anymore.

Sileighty_85 · 11-01-2009, 07:14 PM

Quote:

Originally Posted by SilS13Coupe

He says exhaust mani came loose and when he bolt it back on it wouldnt boost anymore.

what turbo is he running?

Im gonna ROTFL if you say stock.... please say stock

SilS13Coupe · 11-01-2009, 07:18 PM

Quote:

Originally Posted by Sileighty_85

what turbo is he running?

Im gonna ROTFL if you say stock.... please say stock

Lol yup stock turbo. I guess we solved the issue? A new turbo is in need?

Sileighty_85 · 11-01-2009, 07:25 PM

Quote:

Originally Posted by SilS13Coupe

Lol yup stock turbo. I guess we solved the issue? A new turbo is in need?

BINGO!!!

The Stock turbo exhaust wheel is ceramic so anything over basically 12psi (some say 10 some sy 14) with destroy the exhaust wheel= No Boost

Tell your buddy hes a dumbass

kushlivin · 11-01-2009, 07:31 PM

Quote:

Originally Posted by Sileighty_85

BINGO!!!

The Stock turbo exhaust wheel is ceramic so anything over basically 12psi (some say 10 some sy 14) with destroy the exhaust wheel= No Boost

Tell your buddy hes a dumbass

thats too fu*king funny

^^

SilS13Coupe · 11-01-2009, 07:33 PM

Quote:

Originally Posted by Sileighty_85

BINGO!!!

The Stock turbo exhaust wheel is ceramic so anything over basically 12psi (some say 10 some sy 14) with destroy the exhaust wheel= No Boost

Tell your buddy hes a dumbass

hahaha, well hes selling it because he doesnt know whats going on.

Maybe i should pick it up and just replace the turbo.

Sileighty_85 · 11-01-2009, 07:38 PM

Quote:

Originally Posted by SilS13Coupe

hahaha, well hes selling it because he doesnt know whats going on.

Maybe i should pick it up and just replace the turbo.

lol maybe...

FYI same goes for the RB25 Turbo too.

SilS13Coupe · 11-01-2009, 07:41 PM

Quote:

Originally Posted by Sileighty_85

lol maybe...

FYI same goes for the RB25 Turbo too.

So most likely, just replacing the turbo will be ok right. If that is the case, i'll definitely pick it up. Hes selling it for cheap.

What kind of turbos are on the RB's?

Unique · 11-01-2009, 07:43 PM

I remember one of my boys having a similiar problem, his brake booster took a crap which caused a vaccum leak which caused the car to run lean and not letting the car boost regularly.

Sileighty_85 · 11-01-2009, 07:54 PM

Quote:

Originally Posted by SilS13Coupe

So most likely, just replacing the turbo will be ok right. If that is the case, i'll definitely pick it up. Hes selling it for cheap.

What kind of turbos are on the RB's?

Not sure on the turbo's Numbers but they can be compared to the SR's turbos
RB20=T25
RB25=T28

RB20 Right RB25 Left

SilS13Coupe · 11-01-2009, 07:58 PM

Quote:

Originally Posted by Sileighty_85

Not sure on the turbo's Numbers but they can be compared to the SR's turbos
RB20=T25
RB25=T28

RB20 Right RB25 Left

Thanks alot! But before i pick it up, i just want to make sure that IS the problem..

Sileighty_85 · 11-01-2009, 08:02 PM

Quote:

Originally Posted by SilS13Coupe

Thanks alot! But before i pick it up, i just want to make sure that IS the problem..

right the problem will be oblivious due to no exhaust wheel/broken fins

i can pretty much gaurentee you thats the problem

Yellow4g63 · 11-01-2009, 08:16 PM

If he turned it to 18psi on the stock turbo how much u want to bet he has a stock pump in it too. Could have hurt the motor or head gasket too.

SilS13Coupe · 11-01-2009, 08:18 PM

well he said that the car starts up fine, no smoke or anything. And he said you can still hear the turbo wheels spinning.

Sileighty_85 · 11-01-2009, 08:24 PM

Quote:

Originally Posted by SilS13Coupe

well he said that the car starts up fine, no smoke or anything. And he said you can still hear the turbo wheels spinning.

Thats just the Ball bearing CHRA, the wheel is destroyed so it wont build boost at all cuz it cannot spin fast enough.

Like Yellow said check that pump

SilS13Coupe · 11-02-2009, 01:05 PM

Quote:

Originally Posted by Sileighty_85

Thats just the Ball bearing CHRA, the wheel is destroyed so it wont build boost at all cuz it cannot spin fast enough.

Like Yellow said check that pump

Would i just need to the replace the turbo itself? I want to pick it up, but i dont wanna risk buying it, replacing the turbo and find out the motor is gone.

It if doesnt blow any smokes, the gasket should be ok and the motor should be ok too right?

Sileighty_85 · 11-02-2009, 05:06 PM

Quote:

Originally Posted by SilS13Coupe

Would i just need to the replace the turbo itself? I want to pick it up, but i dont wanna risk buying it, replacing the turbo and find out the motor is gone.

It if doesnt blow any smokes, the gasket should be ok and the motor should be ok too right?

cant really say for certian that is the only problem but i would check the turbo first.

If he still has a cat (doubtful) pull the cat and look for little ceramic pieces

SilS13Coupe · 11-04-2009, 12:06 AM

It has cutouts.

11-01-2009, 06:20 PM	#1
SilS13Coupe Leaky Injector Join Date: Oct 2009 Location: Socal O.C Posts: 90 Trader Rating: (1)	RB20 boost leak? My friends RB20 has a boost leak, he turned up the boost to about 18psi and then the manifold came loose. Can anyone help with the problem? Where would be the couple of places to check? Thanks

11-01-2009, 07:43 PM	#13
Unique Leaky Injector Join Date: Jan 2006 Location: Los Angeles, Cali. 818 Age: 27 Posts: 104 Trader Rating: (1)	I remember one of my boys having a similiar problem, his brake booster took a crap which caused a vaccum leak which caused the car to run lean and not letting the car boost regularly. __________________

11-01-2009, 08:16 PM	#17
Yellow4g63 Zilvia Junkie Join Date: Jan 2003 Location: Moreno Valley, Ca Age: 33 Posts: 347 Trader Rating: (0)	If he turned it to 18psi on the stock turbo how much u want to bet he has a stock pump in it too. Could have hurt the motor or head gasket too. __________________ protech-fabrication.com ftw!!

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11-01-2009, 06:41 PM	#2
kushlivin In time-out for misbehaving. Join Date: Nov 2008 Location: Fontana,California 92336 Age: 25 Posts: 389 Trader Rating: (5)	the manifold maybe. intercooler piping/mount.bov,etc,etc...

11-01-2009, 08:18 PM	#18
SilS13Coupe Leaky Injector Join Date: Oct 2009 Location: Socal O.C Posts: 90 Trader Rating: (1)	well he said that the car starts up fine, no smoke or anything. And he said you can still hear the turbo wheels spinning.

11-04-2009, 12:06 AM	#22
SilS13Coupe Leaky Injector Join Date: Oct 2009 Location: Socal O.C Posts: 90 Trader Rating: (1)	It has cutouts.