Z32 MAF Grounding/Run lean? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

MrFairlady · 07-27-2009, 09:47 PM

I'm trying to Diag an issue that my car is Running leaner than it should be.
SR20,Enth ECU tune,D/W 550 etc GT2860RS
the 2 Grounds on the Maf Wiring and the "ABCDEF".
-Some say to ground/Solder together into the stock SR Maf wiring(which is what I'm running).
-Some say to run a ground to the body.

Which is it?
COULD a Diff ground cause a dif reading and Run Lean?
Car is running like 15/High 16.9's @ idle (should be flat on its face) and 15's-16's cruise but when I hit 10psi 1 time it only made it to like 13's.No Bueno'!
Runs/idles Great - No Breaking up - nothing
I just don't Wanna blow it up 1st time out and can't get to a dyno ATM.

My Brand new AEM wideband though, is Mounted very far down the pipe,right up against/near the Flange for the Cat to start.Wondering if thats why is Reading Leaner than it is maybe?
Checking the Maps w/ consult - I'm actually MAXING out the MAP w/ a Z32.That Def should not be!

---------------------------------------------------------------------
theres so many diagrams and yes I've searched and everyone seems to agree on whoevers thread "thanks" or "Thats a good write up".
Not the correct or incorrect way I guess.
http://www.zilvia.net/f/tech-talk/58...f-upgrade.html

http://jimwolftechnology.com/wolfpdf...%20NISSANS.PDF

http://zilvia.net/f/tech-talk/97622-...0det-pics.html

VNG704 · 10-07-2009, 02:56 PM

2 month old thread, but did you ever find out what the problem was? how did you fix it?

MrFairlady · 10-07-2009, 03:01 PM

Enthaply Tune (tuned for 50psi base) + D/W injectors Flow rate states on the Chart that 50psi Base Pressure = 553 (+/-) cc injectors.

MEANING basically at 43psi Stock base pressure, i was only getting like 480cc's worth.
Car Ran Like a Champion till #2 Rod Bearing Took a shit.

VNG704 · 10-08-2009, 08:10 AM

Ran lean and lead to the rod bearing crapping on you? So then if you bumped to 50 psi, you would have been in the good? Making sure b/c I'm kinda having a similar predicament. thnx.

MrFairlady · 10-09-2009, 08:58 PM

Quote:

Originally Posted by VNG704

Ran lean and lead to the rod bearing crapping on you? So then if you bumped to 50 psi, you would have been in the good? Making sure b/c I'm kinda having a similar predicament. thnx.

No..lean in fuel didn't cause the Bearing to go...someone before me that had this engine was a Moron and didn't take care of it.
It was Pretty Dirty Inside and Most likely didn't like to change the oil much.So It decided to "just go" 1 day.Oh well.All Getting fixed now.

50psi had my a/f's in Great shape after I adjusted it.
My injectors are Rated "550" at 49psi.Stock pressure is 43psi IIRC, and the injectors only flowed like 470 at that setting.

07-27-2009, 09:47 PM	#1
MrFairlady Nissanaholic! Join Date: Mar 2007 Location: Fascination Street,N.C Age: 42 Posts: 1,701 Trader Rating: (31) Rides Gallery: MrFairlady Feedback Score: 31 reviews	Z32 MAF Grounding/Run lean? I'm trying to Diag an issue that my car is Running leaner than it should be. SR20,Enth ECU tune,D/W 550 etc GT2860RS the 2 Grounds on the Maf Wiring and the "ABCDEF". -Some say to ground/Solder together into the stock SR Maf wiring(which is what I'm running). -Some say to run a ground to the body. Which is it? COULD a Diff ground cause a dif reading and Run Lean? Car is running like 15/High 16.9's @ idle (should be flat on its face) and 15's-16's cruise but when I hit 10psi 1 time it only made it to like 13's.No Bueno'! Runs/idles Great - No Breaking up - nothing I just don't Wanna blow it up 1st time out and can't get to a dyno ATM. My Brand new AEM wideband though, is Mounted very far down the pipe,right up against/near the Flange for the Cat to start.Wondering if thats why is Reading Leaner than it is maybe? Checking the Maps w/ consult - I'm actually MAXING out the MAP w/ a Z32.That Def should not be! --------------------------------------------------------------------- theres so many diagrams and yes I've searched and everyone seems to agree on whoevers thread "thanks" or "Thats a good write up". Not the correct or incorrect way I guess. http://www.zilvia.net/f/tech-talk/58...f-upgrade.html http://jimwolftechnology.com/wolfpdf...%20NISSANS.PDF http://zilvia.net/f/tech-talk/97622-...0det-pics.html __________________ z-tERty-2

10-07-2009, 03:01 PM	#3
MrFairlady Nissanaholic! Join Date: Mar 2007 Location: Fascination Street,N.C Age: 42 Posts: 1,701 Trader Rating: (31) Rides Gallery: MrFairlady Feedback Score: 31 reviews	Enthaply Tune (tuned for 50psi base) + D/W injectors Flow rate states on the Chart that 50psi Base Pressure = 553 (+/-) cc injectors. MEANING basically at 43psi Stock base pressure, i was only getting like 480cc's worth. Car Ran Like a Champion till #2 Rod Bearing Took a shit. __________________ z-tERty-2

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10-07-2009, 02:56 PM	#2
VNG704 Zilvia FREAK! Join Date: Dec 2008 Location: Wisconsin Posts: 1,575 Trader Rating: (17) Feedback Score: 17 reviews	2 month old thread, but did you ever find out what the problem was? how did you fix it?

10-08-2009, 08:10 AM	#4
VNG704 Zilvia FREAK! Join Date: Dec 2008 Location: Wisconsin Posts: 1,575 Trader Rating: (17) Feedback Score: 17 reviews	Ran lean and lead to the rod bearing crapping on you? So then if you bumped to 50 psi, you would have been in the good? Making sure b/c I'm kinda having a similar predicament. thnx.