Grumpy

If you poke around the DIY_EFI site the WB stuff is posted now.
Not a lab grade unit but for what "we" do is all we need.

Before anyone even mentions it.
This is all hobby stuff, NOT for profit. If your not a man of your words, please go else where. If you have to try and make a buck or offer to buy one, please just ignore the whole deal.
Yes, I'm testy about this, I've been involved with it for 4 years, and invested alot in gettin it this far.
Bruce

drive it

iTrader: (1)

HOORAAYYY!!!!!



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86 406

v8power

hate to sound stupid but what is that?

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Objects in mirror are more stable than they appear
www.members.home.com/v8power
4BBL to TPI in the works
86 350 5spd

E.E.T (Electronics Engineering Technologist)

Grumpy

You have switching type O2 sensors and wide Bands.
GM's oem ones just switch over from rich to lean at 14.7:1 Air Fuel ratio. While some folks try to make something more of them then that, that's all they can accurately do. A WB on the other hand is designed to read specific AFRs.
While a switching type can just operate on exhaust heat, a WB needs some careful temperature mangement to get an accurate *fix* on what's going on, also some critical managing circuitry to get the signal out.

89vette

Is this used in place of the OEM WB? Or does it need its seperate bung? If you used it for WOT tuning only can you just program the car to stay in open loop?

Thanks,
Jason

Grumpy

For the moment, it's just the guts of the matter, and it's output is read with a DVM. So no it can't be used with the stock ecm yet.

You can weld together a sampling pipe and just clamp it on when you want to use it. But using anti-foulsers and cutting them to size is a no brainer, then NAPA has a drain plug the same size as the sensor so you can just run it when you want.

thing to remember is that you can't run it without powering it up, or it ruins the sensor.

-=Jeff=-

I just looked at DIY-EFI.org to see what it entails..

That is Very

from what I understand for this to be useful I will need another 'bung' for this o2 correct?

Thanks

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-=Jeff=-
89 Corvette Coupe White with Black Grand Sport Stripe
-=ICON Motorsports=-
Check out my mods on My '89 Vette

Grumpy

I went to the trouble in the GN to add a bung, $4 spark plug antifouler, hacsaw and dremel modification, and $5 at teh muffler shop. When not in use I have an oil plug from NAPA to fill the hole.

Then I also got a piece of 2' long 2" muffler pipe and welded a bung 9" in from the end. Then a strap down the side, so now with a large hose clamp, can install it in about any car I want. I'd had a number of fast passes with it in the GN like that and no problems
YMMV

Greenshamrock77

This is very cool!!!

I cross refd the sensor to a Bosche--13002, and Autozone has it for $220. Is that cheaper than Napa?

Also I talked to an EE I know about making a circuit that would read the output voltages and display them as a numeric AFR on a simple LCD display. If and when successful, I'll spread the instructions. Electronics design is a little beyond me, I can handle the simple stuff. I am working on my ME degree.

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82' Z-28. 327" w/ flat tops. 216/228/112LS. Pocket ported 041 heads 1.94/1.50 SS valves. World Class T-5 from a 91'. Best run? Runs with 2001 vette to 150mph! Soon to be converted over to TPI w/ supercharger.

Grumpy

NAPA's been going for about $139.
You want an OS 791

Tim Burgess

If anyone is interested in building this circuit that the guys at diy-efy.org have so gracefully designed, there is a group purchase going in for a lot of PC boards that will be closed on 8-24. If you are interested in ordering a PC board, fill out the form at http://208.37.117.207/wb.html and submit it. The cost of a board will be approximately $9 & they will be shipped out around 9-10.

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Tim

1992 Z28, 305 TPI 5 speed, 12.1 sec @ 114.7 mph

1984 Berlinetta 305 TPI Auto, 13.8 sec @ 99.7 mph

[This message has been edited by Tim Burgess (edited August 18, 2001).]

[This message has been edited by Tim Burgess (edited August 18, 2001).]

John Millican

iTrader: (1)

What benifit is a WB O2 sensor?

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86 Camaro Sport
383 Speed-O-Motive Crate Engine, Raptor 700R4 Tranmission, Trick Flow Twisted Wedge G2's, 58mm Accel TB, 3.73 Auburn Pro, SLP Cold Air Induction and Headers, Hooker Cat-back, Serpentine Belt Setup, Dual IROC Fans, Jamex springs, 16" IROC Rims, 36mm/24mm Sway Bars, Global West Steering Brace. Hotchkis Rear LCA's,Panhard Bar and SFC's.
My Camaro Project

Tim Burgess

John,

A wide band O2 sensor has the ability to indicate A:F mixture ratio accurately over a wide range (10:1 to 20:1, for example), which is very useful in tuning. The O2 sensors used in our third gen systems are narrow band sensors, which are only accurate near the stoichiometric ratio (14.7:1), and may only be used to determine if the mixture is rich or lean, and where the transition point is. Check it out at http://www.diy-efi.org/diy_efi/projects/diy_wb/


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Tim

1992 Z28, 305 TPI 5 speed, 12.1 sec @ 114.7 mph

1984 Berlinetta 305 TPI Auto, 13.8 sec @ 99.7 mph

[This message has been edited by Tim Burgess (edited August 18, 2001).]

AustinT

Hey I dont have a Background in electronics (yet) But im going to give this one a try. I orderd 2 boards on the group Purchase. Where Is the best place to get all of the parts? Thanks for your time and Know-How

John Boy

iTrader: (3)

Well I know this is dumb, but I gotta ask it. Where or how do I pay for a board on that gp above?
Thanks.

Grumpy

http://208.37.117.207/wb.html

Tim Burgess

I created a Digikey part number parts list for the circuit that should appear on the diy-efi.org web site shortly. If you would like a copy of the list, send me an e-mail.

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Tim

1992 Z28, 305 TPI 5 speed, 12.1 sec @ 114.7 mph

1984 Berlinetta 305 TPI Auto, 13.8 sec @ 99.7 mph

steve8586iroc

Which ecm's will this work on?

hectorsn

All of them and none of them. A WBo2 does not replace the factory narrow band o2. It's just a tool used to determine actual AFR. As long as you have a spare o2 bung you can use it on any car with any ecm, or no ecm at all.

a73camaro

Gotta ask. I would think that one should be able to get a junkyard WB O2 sensor. What kinda life can one expect from one of these sensors?

AustinT

I orderd two boards. How and when Can I pay for them?

Grumpy

I have yet to hear of one being found in a junkyard, who's to say it would be good to begin with?.
using unleaded they are designed to last like a normal one, ie at least 50K miles. On a decent running engine I'd expect a fair amount longer then that.
When running leaded race gas, there are all kinds of variances about how long they last.
I'll be using mine for when I'm actually tuning, and the take it out when not in use, a simple extra bung makes that possible, and then just a drain plug to block the hole

Grumpy

For the moment, this just has a voltage output that you read with a voltmeter, and then translate that to a AFR.
There are several displays and interface projects going. In the next few weeks there should be some news along those lines.