S14 sr super high afr PLEASE HELP - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Breakbeat93 · 09-10-2011, 08:25 AM

I just got my s14 sr in and running. Feels strong, and I hear no detonation, but my afr is at 16-18 at wot until about 4500 rpm. Then it comes down to about 13.5 and goes down to about 12 by redline. The o2 is mounted right under the shifter. Walbro pump, z32 filter, 3 inch catless exhaust, front mount, s14 mafs, stock ecu tune. I have a cheap pos fuel pressure gauge showing about 50lbs at idle and jumps to 60 when I pull the throttle. I don't wanna pop my engine before I even get to use it. PLEASE HELP!

EDIT: I'm reading up to about 6 psi at the manifold while my afr is still buried in the red

*fliprayzin240sx* · 09-10-2011, 06:47 PM

You double checked your timing and made sure its not advanced? Also, if everything is stock, kick the FPR down to 40 psi with out a vacuum source hooked up to.

fufanu180 · 09-10-2011, 07:18 PM

At stock that's what the fuel pressure should be at? 40lbs?

Breakbeat93 · 09-10-2011, 07:54 PM

Stock should be 43. I pulled vac from my fpr. No change

fufanu180 · 09-24-2011, 09:08 PM

Pulling the vacuum line will cause it to rise to like 48 correct?

On the s14 sr20det, the vacuum hose comes from the port off the intake manifold or the throttle body?

CenTex240

09-10-2011, 08:25 AM	#1
Breakbeat93 Zilvia Member Join Date: Dec 2010 Location: Southern NY Age: 42 Posts: 180 Trader Rating: (4) Feedback Score: 4 reviews	S14 sr super high afr PLEASE HELP I just got my s14 sr in and running. Feels strong, and I hear no detonation, but my afr is at 16-18 at wot until about 4500 rpm. Then it comes down to about 13.5 and goes down to about 12 by redline. The o2 is mounted right under the shifter. Walbro pump, z32 filter, 3 inch catless exhaust, front mount, s14 mafs, stock ecu tune. I have a cheap pos fuel pressure gauge showing about 50lbs at idle and jumps to 60 when I pull the throttle. I don't wanna pop my engine before I even get to use it. PLEASE HELP! EDIT: I'm reading up to about 6 psi at the manifold while my afr is still buried in the red

09-10-2011, 06:47 PM	#2
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	You double checked your timing and made sure its not advanced? Also, if everything is stock, kick the FPR down to 40 psi with out a vacuum source hooked up to. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

09-10-2011, 07:18 PM	#3
fufanu180 Zilvia Junkie Join Date: Dec 2009 Location: Austin, Tx. Age: 34 Posts: 481 Trader Rating: (12) Feedback Score: 12 reviews	At stock that's what the fuel pressure should be at? 40lbs?

09-10-2011, 07:54 PM	#4
Breakbeat93 Zilvia Member Join Date: Dec 2010 Location: Southern NY Age: 42 Posts: 180 Trader Rating: (4) Feedback Score: 4 reviews	Stock should be 43. I pulled vac from my fpr. No change

09-24-2011, 09:08 PM	#5
fufanu180 Zilvia Junkie Join Date: Dec 2009 Location: Austin, Tx. Age: 34 Posts: 481 Trader Rating: (12) Feedback Score: 12 reviews	Pulling the vacuum line will cause it to rise to like 48 correct? On the s14 sr20det, the vacuum hose comes from the port off the intake manifold or the throttle body? CenTex240