UnderDogRS

who makes a good A/F ratio and eletronic fuel pressure guages. im going to install them and would like to know that the set i get is correct.

p.s
any pics of these in a pod setup would be a plus!

tia,
RS

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1992 Camaro RS
Mods:
14x3 Open element w/ K&N filter, MSD 6a, MSD GM blaster Coil ,MSD 8.5 SC wires, AFPR,Fuel Pressure gauge(60Psi max), 3-Row Al rad. , 180* t-stat, Hooker 1 5/8 headers, 3" Catco cat, 3" Hooker Aero Chamber cat-back, "Ultimate TBI" mods

Best Time: 15.279@89.02MPH
Underdog Racing

Andy89RS

For A/F guage Autometer is by far the best, the others I've seen only have 3 l.e.d.s for lean, stoich, and rich. I'm also planning on going with Autometer full sweep fuel pressure guage. Here's a pic of my A/F guage in a pod mounted on the right switch pod:


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"Racing is life. Everything else is just waiting." - Steve McQueen - LeMans

305 TBI, T-5. 15.4@92 mph
Member Southern California Third Gen F-Bodies

AOL IM: Andy89RS

Mongoose

iTrader: (2)

I have the Autometer electric fuel pressure gauge. Way more reliable than any mechanical using an isolater. Reads accurate with no vibration either. I'm planning for an A/F ratio gauge as well.


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Mongoose-NCTGA-1990 Pontiac Formula/305 TBI-700R4 with Edelbrock Performer TBI intake,TES headers,and STB,K&N,MSD-6AL,Holley laser shot coil,Accel Extreme 9000 wires,Jet Stage 2 chip,TCI shift kit with corvette servo,Richmond 3.73 gear with Auburn 3 series posi,no cat,SLP 3" cat back,Eibach sportline springs,Energy Suspension poly throughout,Lakewood LCA and adjustable panhard bar package,SSM subframe connectors,IROC wonder bar,Tokico 5 way adjustable struts and shocks,Autometer electric fuel pressure gauge,Alpine,JL Audio,MB Quart,92 GTA taillights,92 GTA aero wing and hatch,Steve Spohn LCA relocater kit,MacEwen White face gauges,84 T/A cold air induction air cleaner.

snflupigus

andy, where you get the carbon fiber stuff?

Grumpy

The OEM GM 3rd Gen O2 sensors are a switching type. Meaning the only thing they do accurately is switch form lean to rich at 14.7:1 at about .44v..
They are subject to exhuast back pressure and EGTs to throw off the readings, other then *roughly* the switching point.
NTK, Baily and Motec have nice ones for about a grand.
There is a DIY one at the GMECM site.
People have kinda gotten away with as a rough guage, but others have had it bite them when they tune to a volatge of a specific value, nothing beats reading the plugs.
I've had both mech and elec FP guages fail and with either would run an isolator.

snflupigus

a grand???????what??????

Andy89RS

snflupigus: I made that carbon fiber trim myself. I got a sheet of self adhesive carbon fiber (looking) trim at a local Hobby Shack and cut it out to match. Getting the curves just right is a whole lot more of a bitch that you might think!

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"Racing is life. Everything else is just waiting." - Steve McQueen - LeMans

305 TBI, T-5. 15.4@92 mph
Member Southern California Third Gen F-Bodies

AOL IM: Andy89RS

snflupigus

well it looks great, i have the newer style dash since ive got a 92, but im still gona try and integrate it somewhere. thanks

Grumpy

If you want an actual Air Fuel Ratio Meter, they cost about a grand. Yes.. The oem ones are switching types. They change outputs with EGT, and back pressure changes. If you get ahold of any good data logging with a real wide band vs a gm style you can see the oem swing about .3 (AFR) while the WB is steady. The voltage for a particular AFR can also change from pass to pass. There are a total of 2 redially available WB O2 sensors, and the NTK series as used in the one Honda is $230. Yes that is just for the sensor, You simply can't get a $30 sensor to be a precise devise. Like I mentioned if you read the DIY_EFI archives, you can find out the truth about them. Hell, the CARB, and EPA aren't even sure they are reading O2 content anyway.
If you used the same sensor on the same car as what folks like K+N do (and otheres do), then to some degree, you would have an INDICATION, of the AFR. But that's just about it. Folks are just tooo willing to beleive advertizing.

snflupigus

but isnt it a good enough indication to know if you are rich or lean, like a scantool?

Andy89RS

For a grand I better get more than an air/fuel reading...