Wideband owners... afr question? - Page 3

**Zach** · 5-13-08, 10:18

Any thoughts/input on the Zeitronix ZT-2 system? Seems fairly reasonable with what comes 'in the box'

Also, the add-on LCD screen is a very nice touch.

Wide Band Air Fuel Ratio Meter

**RbluEMx6** · 5-13-08, 11:29

Quote:

Originally Posted by fredio54

thats a mis fire i bet you! 13 is pretty rich, how are the leads/plugs/cap/rotor/etc and what are you using for engine management? whats dwell set at? can you data log? it could be dropping sync and removing fuel for an instant or something. Can you feel these as kicks or bucks? even slightly?

Leads are new MSD 8.5mm wires and NGK R5671A-8 (of which I have a few new sets laying around). While cruisin and it does that, I can't feel those kicks. But when I get off the throttle, shift, and get back on the throttle I could feel those bucks when the gauge jumps to 19-22.

Under wot and boost it maintains a steady 12 afr. I can data log it and see whats going on.

**fredio54** · 5-13-08, 14:21

Well if you can feel it then odds are it's real :-)

Lean could be miss fire or actual lean ness for some reason to do with your ecu. The miss could be because of the ecu too i guess.

**Mazda Carnage** · 5-14-08, 1:36

For those who are still on stock ECU and have a wideband, you can adjust your A/F's at idle.
After everything is set up properly (vacuum, timing, idle), you ground the test connector and use the screw on the air flow meter (the one hidden under the aluminum plug) to adjust idle A/F's, this will affect RPM at Idle which should then be returned using the Idle adjustment screw on the TB. then check the timing (all with the test connector grounded).

As far as Idle A/F's (on all my engines and different set ups, with different wide-bands and only two constants, all had new Bosh o2 narrow band sensors replacing the factory ones and 90+ GT injectors instead of the 88-89 gt...)

I idle at 3 lights on the digital dash (4 lights is roughly 750 RPM) maybe 600 rpm with the engine at normal temp I get steady 14.9 A/F's. with the head lights off (under drive pulley, no PS/AC belt and a lightened or lightweight flywheel) the RPM's increase to 4 lights (close to or at 750 rpm) and the A/F's will be between 15.0 and 15.1 A/F's depending on outside air temp.
rpm at idle affects A/F's.

Under cruise I see 15.7-15.4 a/f's, very gentle on the throttle, any more throttle and I see 14.9-14.2, still in vacuum (all this under 3000 rpm).

Remember our primitive factory OBD1 set-up, loops the O2 reading after 3000 rpm so crossing that rpm with the same throttle will drop into the 12.9+- A/F's feathering the throttle above 3000 rpm can sometimes result in normal cruising A/F's (14.9-15.7).

**RbluEMx6** · 5-16-08, 11:30

I'm also interested in what settings people use for the LM programmer.

compnut21 · 5-16-08, 16:09

mines on the default settings

**Zach** · 5-16-08, 17:32

No one has any thoughts on the Zeitronix I posted about?

compnut21 · 5-16-08, 18:33

link doesnt work

**Zach** · 5-16-08, 20:58

Quote:

Originally Posted by compnut21

link doesnt work

your interw3b is b0rked...it works for me.

compnut21 · 5-16-08, 21:40

your mother is b0rked

looking at it, it looks like the lc-1, except with a datalogging box. never heard anything about it though.

on a side note, my car is finally registered and on the same day my car battery stopped being dumb AND my wideband sensor lost calibration.(edit: fixed) i need gauges now

**SixSick6** · 5-16-08, 22:54

Quote:

Originally Posted by Zach

No one has any thoughts on the Zeitronix I posted about?

I never liked that it doesnt have a usable input for RPM, with our car at least. I owned one years ago and lent it to a friend that I owed money to. I never got it back but I nerver really cared much either. It was a good unit besides the RPM issue.

**TR-mx6** · 5-31-08, 17:08

I just hooked my Wideband on the 326. I have it good at idle and cruise. But im going lean (around 14.5) on 6psi at around 4500rpm. Dammit and it missfires. I'm not too sure how to go about it besides upping fuel pressure or rx7 injectors(which are just about impossible to find.) Either that or my pump is lacking power at higher rpm. It used to pull great before. Gotta check my wiring for the millionth time.

compnut21 · 5-31-08, 19:59

rx7 injectors are easy to come by on any rx7 forums. the last 10 times ive checked someone has some 550's or 440's available.

also interesting topic related comparison. http://www.innovatemotorsports.com/r...B_Shootout.pdf

**TR-mx6** · 5-31-08, 23:07

I found something quite strange. When boosting 1st,2nd and 5th gear. The afr's are just around the 12.5 range in the power range but in 3rd and 4th it leans out to 14.xx . wtf?

compnut21 · 5-31-08, 23:55

i blame the stock ecu. (cause i hate it.) but who knows.

5-13-08, 14:21	#33 (permalink)
fredio54 Join Date: Aug 2004 Location: Auckland, New Zealand iTrader: (1)	Well if you can feel it then odds are it's real :-) Lean could be miss fire or actual lean ness for some reason to do with your ecu. The miss could be because of the ecu too i guess.
	DIYEFI.org - TRUE DIY engine management Mazda FE3/FE-DOHC Master Index Thread (work in progress) Mazda truck with FE-DOHC/FE3 "BIG like your house" Holset Turbo drinking 2.2 litres of fuel per minute ~= 385hp crank RIP SleepCounter :-( we will miss you! - RIP fredio54 :-( will we miss you?

5-14-08, 1:36	#34 (permalink)
Mazda Carnage Join Date: Mar 2004 Location: canada Age: 34 iTrader: (0)	For those who are still on stock ECU and have a wideband, you can adjust your A/F's at idle. After everything is set up properly (vacuum, timing, idle), you ground the test connector and use the screw on the air flow meter (the one hidden under the aluminum plug) to adjust idle A/F's, this will affect RPM at Idle which should then be returned using the Idle adjustment screw on the TB. then check the timing (all with the test connector grounded). As far as Idle A/F's (on all my engines and different set ups, with different wide-bands and only two constants, all had new Bosh o2 narrow band sensors replacing the factory ones and 90+ GT injectors instead of the 88-89 gt...) I idle at 3 lights on the digital dash (4 lights is roughly 750 RPM) maybe 600 rpm with the engine at normal temp I get steady 14.9 A/F's. with the head lights off (under drive pulley, no PS/AC belt and a lightened or lightweight flywheel) the RPM's increase to 4 lights (close to or at 750 rpm) and the A/F's will be between 15.0 and 15.1 A/F's depending on outside air temp. rpm at idle affects A/F's. Under cruise I see 15.7-15.4 a/f's, very gentle on the throttle, any more throttle and I see 14.9-14.2, still in vacuum (all this under 3000 rpm). Remember our primitive factory OBD1 set-up, loops the O2 reading after 3000 rpm so crossing that rpm with the same throttle will drop into the 12.9+- A/F's feathering the throttle above 3000 rpm can sometimes result in normal cruising A/F's (14.9-15.7).
	http://www.cardomain.com/id/mazdacarnage BUILD IT, BEAT IT, BRAKE IT, REBUILD IT, BEAT IT MORE, BRAKE IT AGAIN, BUILD IT BETTER, BEAT IT THE MOST AND ? Figuring out speed limits in Quebec: (cornering) The speed at wich your car will break traction and leave the road -1 km/h .(staight line) In the highest gear, when the car is red lined . Those who do not respect these "SPEED LIMITS" should keep of the roads of QUEBEC.

5-16-08, 11:30	#35 (permalink)
RbluEMx6 Join Date: Sep 2003 Location: San Antonio, TX, USA Age: 23 iTrader: (0)	I'm also interested in what settings people use for the LM programmer.
	-Rick- 88 MX6 GT Celeste <--Cardomain Page Updated 4-18-08 Boosted on an Electromotive TECII standalone. FE-DOHC rebuild 265hp, 290ft/tq @ 15psi '08 FORD Ranger Sport

5-16-08, 16:09	#36 (permalink)
compnut21 Join Date: Oct 2007 Location: Olympia, WA iTrader: (2)	mines on the default settings
	89 GT 4WS/Megasquirt/Zebel o2/2.5" Exhaust/10ish psi 1989 Wiring Diagram PDF Useless crap for sale R.I.P. compnut21?

5-16-08, 18:33	#38 (permalink)
compnut21 Join Date: Oct 2007 Location: Olympia, WA iTrader: (2)	link doesnt work
	89 GT 4WS/Megasquirt/Zebel o2/2.5" Exhaust/10ish psi 1989 Wiring Diagram PDF Useless crap for sale R.I.P. compnut21?

5-16-08, 21:40	#40 (permalink)
compnut21 Join Date: Oct 2007 Location: Olympia, WA iTrader: (2)	your mother is b0rked looking at it, it looks like the lc-1, except with a datalogging box. never heard anything about it though. on a side note, my car is finally registered and on the same day my car battery stopped being dumb AND my wideband sensor lost calibration.(edit: fixed) i need gauges now Last edited by compnut21 : 5-16-08 at 23:07.
	89 GT 4WS/Megasquirt/Zebel o2/2.5" Exhaust/10ish psi 1989 Wiring Diagram PDF Useless crap for sale R.I.P. compnut21?

5-31-08, 17:08	#42 (permalink)
TR-mx6 Rock n' Roll \m/ Join Date: May 2005 Location: , Canada Age: 22 iTrader: (0)	I just hooked my Wideband on the 326. I have it good at idle and cruise. But im going lean (around 14.5) on 6psi at around 4500rpm. Dammit and it missfires. I'm not too sure how to go about it besides upping fuel pressure or rx7 injectors(which are just about impossible to find.) Either that or my pump is lacking power at higher rpm. It used to pull great before. Gotta check my wiring for the millionth time.
	Keepin' it Heavy www.myspace.com/trrock Check us out!

5-31-08, 19:59	#43 (permalink)
compnut21 Join Date: Oct 2007 Location: Olympia, WA iTrader: (2)	rx7 injectors are easy to come by on any rx7 forums. the last 10 times ive checked someone has some 550's or 440's available. also interesting topic related comparison. http://www.innovatemotorsports.com/r...B_Shootout.pdf
	89 GT 4WS/Megasquirt/Zebel o2/2.5" Exhaust/10ish psi 1989 Wiring Diagram PDF Useless crap for sale R.I.P. compnut21?

5-31-08, 23:07	#44 (permalink)
TR-mx6 Rock n' Roll \m/ Join Date: May 2005 Location: , Canada Age: 22 iTrader: (0)	I found something quite strange. When boosting 1st,2nd and 5th gear. The afr's are just around the 12.5 range in the power range but in 3rd and 4th it leans out to 14.xx . wtf?
	Keepin' it Heavy www.myspace.com/trrock Check us out!

5-31-08, 23:55	#45 (permalink)
compnut21 Join Date: Oct 2007 Location: Olympia, WA iTrader: (2)	i blame the stock ecu. (cause i hate it.) but who knows.
	89 GT 4WS/Megasquirt/Zebel o2/2.5" Exhaust/10ish psi 1989 Wiring Diagram PDF Useless crap for sale R.I.P. compnut21?