SAFC Deceleration Setting help - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

four · 03-01-2004, 07:38 AM

I programmed my safc to work with the atmospheric BOV i have. However, on a cold start, it idles very bad, and if i dont give it gas, it will stall.
When the engine is warm, then my car idles just fine, no problems whatsoever. My only problem is cold-starts in the morning, or during the day if i park somewhere for a while.

My car is an s14 w. a redtop
My current DECEL - Air readings are as follows:

Thr - .9%
NE1 - 1.4
NE2 - 1.9
Thanks in advance for anyone that can help.

*AceInHole* · 03-01-2004, 07:42 AM

I just played with the NE1 % untill the cold start idle was bareable. Around 2.3+ worked for my hacked MAF KAT. With the S-AFC and an open atm BOV you're pretty much stuck with either crappy cold start idle or dead idle after deceleration. It's hard to find a happy medium....

four · 03-01-2004, 07:45 AM

Cool, thanks for the quick reply.

I know its possible, because a friend of mine had it on his setup, but he doesnt remember what he had for that setting. (he sold the s-afc and got a power FC)

what is your complete readings?

Thr?
ne1 - you said was 2.3
ne2?

IIRC, it says on the manual that ne1 must be less than ne2

thanks again in advance

*AceInHole* · 03-01-2004, 07:52 AM

I'm not sure if the manual said what it was supposed to say... there's a lot that seems lost in translation.

My NE2 was set to like .5 or something. The settings I used most were like:
Thr: 0.4%
NE1: 2.5%
NE2: 0.5%

It will most likely be a bit different for your car, though.

four · 03-01-2004, 08:04 AM

What setup are you running? Do you have a KA-T or SR?

Edit:

Also, what are your ne1 and ne2 RPM settings?

I think this is where i F*ed up

*AceInHole* · 03-01-2004, 08:29 AM

I'm running a KAT. NE1 = 1000rpm, NE2 = 3000. I'd rather have them closer together but I did this for more resolution up top where I need it more (SAFC II v. 1)

four · 03-01-2004, 08:33 AM

Yea, thast where its different because i dont think my gap is that much.

I guess ill try to mess with it again, and re-tune.

Thanks

four · 03-01-2004, 12:08 PM

okay, i pretty much tried re-tuning it...basically until the idle doesnt bogg on me anymore..and it seems you cant get it somewhere in the middle..you're right...when i deacelerate...it still sort of hops down rpms, then goes to where it belogs...but its not as bad as before...

im gona keep trying to fine tune...i didnt get to really do it well because by the time i was getting somewhere with the tuning, the engine warmed up...hopefully i can solve this by tonight

Soulja · 03-01-2004, 02:58 PM

I always wondered, why not place the MAF on the cold pipe, after the BOV, that way is not metering the air that being vented?

four · 03-01-2004, 03:14 PM

because tahts custom work haha

four · 03-02-2004, 07:47 AM

---Bump---

Touring240 · 04-16-2004, 09:09 PM

bump for an old thread

did you ever get some settings worked out dec air on your red top? if so what were they? thanks

03-01-2004, 07:38 AM	#1
four Zilvia Addict Join Date: Mar 2002 Location: Northern New Jersey Age: 41 Posts: 673 Trader Rating: (0) Feedback Score: 0 reviews	SAFC Deceleration Setting help I programmed my safc to work with the atmospheric BOV i have. However, on a cold start, it idles very bad, and if i dont give it gas, it will stall. When the engine is warm, then my car idles just fine, no problems whatsoever. My only problem is cold-starts in the morning, or during the day if i park somewhere for a while. My car is an s14 w. a redtop My current DECEL - Air readings are as follows: Thr - .9% NE1 - 1.4 NE2 - 1.9 Thanks in advance for anyone that can help.

03-01-2004, 07:42 AM	#2
AceInHole Autox Technician Join Date: Dec 2001 Location: New Haven, CT Age: 44 Posts: 3,961 Trader Rating: (0) Rides Gallery: AceInHole Feedback Score: 0 reviews	I just played with the NE1 % untill the cold start idle was bareable. Around 2.3+ worked for my hacked MAF KAT. With the S-AFC and an open atm BOV you're pretty much stuck with either crappy cold start idle or dead idle after deceleration. It's hard to find a happy medium.... __________________

03-01-2004, 07:52 AM	#4
AceInHole Autox Technician Join Date: Dec 2001 Location: New Haven, CT Age: 44 Posts: 3,961 Trader Rating: (0) Rides Gallery: AceInHole Feedback Score: 0 reviews	I'm not sure if the manual said what it was supposed to say... there's a lot that seems lost in translation. My NE2 was set to like .5 or something. The settings I used most were like: Thr: 0.4% NE1: 2.5% NE2: 0.5% It will most likely be a bit different for your car, though. __________________

03-01-2004, 08:29 AM	#6
AceInHole Autox Technician Join Date: Dec 2001 Location: New Haven, CT Age: 44 Posts: 3,961 Trader Rating: (0) Rides Gallery: AceInHole Feedback Score: 0 reviews	I'm running a KAT. NE1 = 1000rpm, NE2 = 3000. I'd rather have them closer together but I did this for more resolution up top where I need it more (SAFC II v. 1) __________________

03-01-2004, 07:45 AM	#3
four Zilvia Addict Join Date: Mar 2002 Location: Northern New Jersey Age: 41 Posts: 673 Trader Rating: (0) Feedback Score: 0 reviews	Cool, thanks for the quick reply. I know its possible, because a friend of mine had it on his setup, but he doesnt remember what he had for that setting. (he sold the s-afc and got a power FC) what is your complete readings? Thr? ne1 - you said was 2.3 ne2? IIRC, it says on the manual that ne1 must be less than ne2 thanks again in advance

03-01-2004, 08:04 AM	#5
four Zilvia Addict Join Date: Mar 2002 Location: Northern New Jersey Age: 41 Posts: 673 Trader Rating: (0) Feedback Score: 0 reviews	What setup are you running? Do you have a KA-T or SR? Edit: Also, what are your ne1 and ne2 RPM settings? I think this is where i F*ed up

03-01-2004, 08:33 AM	#7
four Zilvia Addict Join Date: Mar 2002 Location: Northern New Jersey Age: 41 Posts: 673 Trader Rating: (0) Feedback Score: 0 reviews	Yea, thast where its different because i dont think my gap is that much. I guess ill try to mess with it again, and re-tune. Thanks

03-01-2004, 12:08 PM	#8
four Zilvia Addict Join Date: Mar 2002 Location: Northern New Jersey Age: 41 Posts: 673 Trader Rating: (0) Feedback Score: 0 reviews	okay, i pretty much tried re-tuning it...basically until the idle doesnt bogg on me anymore..and it seems you cant get it somewhere in the middle..you're right...when i deacelerate...it still sort of hops down rpms, then goes to where it belogs...but its not as bad as before... im gona keep trying to fine tune...i didnt get to really do it well because by the time i was getting somewhere with the tuning, the engine warmed up...hopefully i can solve this by tonight

03-01-2004, 02:58 PM	#9
Soulja Join Date: Nov 2003 Location: Jersey Shore Age: 45 Posts: 48 Trader Rating: (0) Feedback Score: 0 reviews	I always wondered, why not place the MAF on the cold pipe, after the BOV, that way is not metering the air that being vented?

03-01-2004, 03:14 PM	#10
four Zilvia Addict Join Date: Mar 2002 Location: Northern New Jersey Age: 41 Posts: 673 Trader Rating: (0) Feedback Score: 0 reviews	because tahts custom work haha

03-02-2004, 07:47 AM	#11
four Zilvia Addict Join Date: Mar 2002 Location: Northern New Jersey Age: 41 Posts: 673 Trader Rating: (0) Feedback Score: 0 reviews	---Bump---

04-16-2004, 09:09 PM	#12
Touring240 Zilvia Junkie Join Date: Jan 2003 Location: Victoria BC Posts: 432 Trader Rating: (0) Feedback Score: 0 reviews	bump for an old thread did you ever get some settings worked out dec air on your red top? if so what were they? thanks