rb20det help needed - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

mberistianos · 02-27-2014, 08:29 PM

I have a rb20det and it feels like it isn't building boost under load. it will build boost if I am just sitting and reving the engine but it will not get up and go when I am driving. I know for sure a ka24de has more power than this right now. it has a garrett t3/t4. 650 injectors. front mount intercooler. plenum intake. aftermarket coil packs. stock igniter box. walbro 255. ecu was sent out to be tuned for what I have and to be around 14-18 psi of boost. it shows 0psi when I am driving it. it also seems to be running rich. the fuel pressure is at 60 when idling. if I go any lower the power cuts out.

*brndck* · 02-27-2014, 09:26 PM

I'm guessing either your wastegate is shit or the vacuum line to it is incorrectly routed or leaking. Either that or you have a boost leak.

Sileighty_85 · 02-27-2014, 09:28 PM

if your boost gauge reads 0 psi when driving, then you have a big boost leak which would also explain the engine running rich.

Start with basics kid. Did you even look at the engine before posting this?

mberistianos · 02-28-2014, 05:54 PM

I started the car and got underneath and the waste gate is not sealing. I took it off and it's cx racing and it doesn't seal at all. Any input?

Sileighty_85 · 03-01-2014, 01:00 AM

find out why it dosent close, IE Rust/Carbon build up ans clean it

Or buy a Tial

*brndck* · 03-01-2014, 01:32 AM

Quote:

Originally Posted by mberistianos

I started the car and got underneath and the waste gate is not sealing. I took it off and] it's cx racing] and it doesn't seal at all. Any input?

There's your problem right there.
Buy QUALITY components and you won't have these kind of issues.

supersayianjim · 03-01-2014, 08:41 AM

or maybe you didn't install the wg gasket properly/ at all?

mberistianos · 03-02-2014, 11:23 PM

I had a spare waste gate laying around and I noticed that the other waste gate did not have a fire ring on it. So there was the sealing problem. Now that I have changed that. My car won't start..... So I will pull it lose tomorrow and try to start it but i don't see how that would affect it not starting. It just cranks and cranks. And all I messed with was the waste gate.

mberistianos · 03-02-2014, 11:24 PM

And thanks for the help.

mberistianos · 03-03-2014, 07:27 PM

So I pulled the wastegate off and it started then I put the wastegate back on and it started so thanks everybody. It must have been an electrical issue.

02-27-2014, 08:29 PM	#1
mberistianos Join Date: Dec 2013 Location: valley springs Age: 28 Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	rb20det help needed I have a rb20det and it feels like it isn't building boost under load. it will build boost if I am just sitting and reving the engine but it will not get up and go when I am driving. I know for sure a ka24de has more power than this right now. it has a garrett t3/t4. 650 injectors. front mount intercooler. plenum intake. aftermarket coil packs. stock igniter box. walbro 255. ecu was sent out to be tuned for what I have and to be around 14-18 psi of boost. it shows 0psi when I am driving it. it also seems to be running rich. the fuel pressure is at 60 when idling. if I go any lower the power cuts out. Last edited by mberistianos; 02-27-2014 at 08:31 PM.. Reason: needed more info

02-27-2014, 09:28 PM	#3
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	if your boost gauge reads 0 psi when driving, then you have a big boost leak which would also explain the engine running rich. Start with basics kid. Did you even look at the engine before posting this? __________________ 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

03-01-2014, 01:00 AM	#5
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	find out why it dosent close, IE Rust/Carbon build up ans clean it Or buy a Tial __________________ 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

03-01-2014, 08:41 AM	#7
supersayianjim Nissanaholic! Join Date: Jan 2010 Location: location X Posts: 1,807 Trader Rating: (10) Feedback Score: 10 reviews	or maybe you didn't install the wg gasket properly/ at all? __________________ http://www.240sxforums.com/forums/rb...ject-s-rb.html

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02-28-2014, 05:54 PM	#4
mberistianos Join Date: Dec 2013 Location: valley springs Age: 28 Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	I started the car and got underneath and the waste gate is not sealing. I took it off and it's cx racing and it doesn't seal at all. Any input?

03-02-2014, 11:23 PM	#8
mberistianos Join Date: Dec 2013 Location: valley springs Age: 28 Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	I had a spare waste gate laying around and I noticed that the other waste gate did not have a fire ring on it. So there was the sealing problem. Now that I have changed that. My car won't start..... So I will pull it lose tomorrow and try to start it but i don't see how that would affect it not starting. It just cranks and cranks. And all I messed with was the waste gate.

03-02-2014, 11:24 PM	#9
mberistianos Join Date: Dec 2013 Location: valley springs Age: 28 Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	And thanks for the help.

03-03-2014, 07:27 PM	#10
mberistianos Join Date: Dec 2013 Location: valley springs Age: 28 Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	So I pulled the wastegate off and it started then I put the wastegate back on and it started so thanks everybody. It must have been an electrical issue.