SAFC not working below 3400rpms - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

txrxs · 11-07-2008, 08:29 AM

So I've got a basic kae-t setup with 550's and an safc II. Car runs great overall, but under 3400 rpms the wideband seems to just bounce around and there is no adjustment using the safc. Over 3400 rpms and up in any gear it stays solid on 13.6ish(obviously lower when boosting) and I can adjust my settings accordingly.

My NE points are
800
1600
2200
2800
3400
3800
etc.

What would be causing this and what needs to be done to fix it?

IngS14 · 11-07-2008, 01:48 PM

have you upgrade your Fuel Pressure Regulator?

txrxs · 11-07-2008, 02:22 PM

Yup, Aeromotive. Along with a walbro. Pretty much everything is accounted for, just trying to figure this out. The car runs great, I'm just curious to why I have no correction below 3400rpms.

OBEEWON · 11-07-2008, 02:51 PM

Boost leak.

ewuzh · 11-07-2008, 04:33 PM

Sounds like the ECU is operating in closed loop and "correcting" the SAFC adjustments you're trying to make.

Here's a good post about it: http://www.turbo240.com/forums/viewtopic.php?t=18

txrxs · 11-07-2008, 04:41 PM

Quote:

Originally Posted by ewuzh

Sounds like the ECU is operating in closed loop and "correcting" the SAFC adjustments you're trying to make.

Here's a good post about it: Turbo240 Forums :: View topic - How a SAFC works (Part One)

<3, I actually read a similar article today and it seemed that was the issue. It's not even really an issue, but more of a I wanted to know what was up thing.

11-07-2008, 08:29 AM	#1
txrxs Zilvia Junkie Join Date: Sep 2005 Location: Indy Posts: 549 Trader Rating: (8) Feedback Score: 8 reviews	SAFC not working below 3400rpms So I've got a basic kae-t setup with 550's and an safc II. Car runs great overall, but under 3400 rpms the wideband seems to just bounce around and there is no adjustment using the safc. Over 3400 rpms and up in any gear it stays solid on 13.6ish(obviously lower when boosting) and I can adjust my settings accordingly. My NE points are 800 1600 2200 2800 3400 3800 etc. What would be causing this and what needs to be done to fix it? __________________ DRIFTINDY

11-07-2008, 01:48 PM	#2
IngS14 Zilvia Addict Join Date: Jul 2004 Location: DriftHeaven,CA Age: 41 Posts: 647 Trader Rating: (7) Feedback Score: 7 reviews	have you upgrade your Fuel Pressure Regulator? __________________

11-07-2008, 02:22 PM	#3
txrxs Zilvia Junkie Join Date: Sep 2005 Location: Indy Posts: 549 Trader Rating: (8) Feedback Score: 8 reviews	Yup, Aeromotive. Along with a walbro. Pretty much everything is accounted for, just trying to figure this out. The car runs great, I'm just curious to why I have no correction below 3400rpms. __________________ DRIFTINDY

11-07-2008, 02:51 PM	#4
OBEEWON Post Whore! Join Date: Feb 2006 Location: Hightened State of Emergency Posts: 6,051 Trader Rating: (9) Feedback Score: 9 reviews	Boost leak. __________________

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11-07-2008, 04:33 PM	#5
ewuzh Zilvia Member Join Date: Oct 2006 Location: SoCal Age: 36 Posts: 263 Trader Rating: (0) Feedback Score: 0 reviews	Sounds like the ECU is operating in closed loop and "correcting" the SAFC adjustments you're trying to make. Here's a good post about it: http://www.turbo240.com/forums/viewtopic.php?t=18