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#847931 - 11/20/07 02:04 AM air/fuel ratio gage in my 22r carbed engine?
haulie Offline
Getting the Wheeling Fever
Registered: 06/24/07
Posts: 29
I bought a 3 gage windshield pillar post for my '84 truck. Two of the gages will be the usual suspects, water temp and oil pressure.

I'm considering putting a fuel injection exhaust manifold with the stock screw in O2 sensor on the engine I'm building. The engine I've got is a "bowtie block", i.e., 85 and later. I'm looking at an autometer air/fuel narrow ratio gage. see here I'm thinking that it could be a useful tuning tool.

Anyone done this? Would it be useful, or just an instrument of self torture?

Any other ideas on what to fill the third hole with? Ammeter, oil temp, cylinder head temp?

Thanks


Edited by haulie (11/20/07 10:50 AM)
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#847932 - 11/21/07 09:41 AM Re: air/fuel ratio gage in my 22r carbed engine? [Re: haulie]
fourwd1 Offline
Body Damage is Cool
Registered: 02/16/01
Posts: 1681
Loc: Baltimore, MD USA
Seems like a waste of $, there isn't a whole lot of tuning to be done with the carb. To me a ammeter or vacuum gauge would be more useful, and cheaper.

just my .02
_________________________
- seen in FOUR WHEELER mag July 2006 & OFF-ROAD mag Feb 2007 - '84 4Runner ARBed 5.29s F&R,4.7 & 2.28 t-cases,hy-steer,BudBuilt skid,30spl Longs,36" TSLs,Chevys '83 P/U, Buick 231 V6,Holley 4 bbl,Weiand intake,Downey headers,TH350 w/700R4 gearset
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#847933 - 11/21/07 09:49 AM Re: air/fuel ratio gage in my 22r carbed engine? [Re: fourwd1]
dcg9381 Offline
Rock Warrior
Registered: 10/05/00
Posts: 669
Loc: Austin,TX
I like 'em.
Just so you understand - a narrow band really has three positions: rich, stoich, and lean. That's all it's really going to tell you. Peak power is around 13.3-13.8 AFR, which is rich... I find them to be reasonably useful tools when tuning if you're not school.
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22REturbo.net 1988 4Runner 22RTE core, turbocharged, megasquirted...
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#847934 - 11/21/07 10:07 AM Re: air/fuel ratio gage in my 22r carbed engine? [Re: dcg9381]
Greg_Canada Offline
Roll Me Over
Registered: 08/25/03
Posts: 2853
Loc: Toronto, Canada
A wideband o2 sensor would be nice but you probably dont want to spend that kind of money.
I'd install a vacuum gauge...
_________________________
89 4Runner 3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim
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#847935 - 11/21/07 10:50 AM Re: air/fuel ratio gage in my 22r carbed engine? [Re: Greg_Canada]
haulie Offline
Getting the Wheeling Fever
Registered: 06/24/07
Posts: 29
Thanks for the replies. I'm not too familiar with the vacuum gage concept. What is telling me and why is it useful?
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#847936 - 11/21/07 11:36 AM Re: air/fuel ratio gage in my 22r carbed engine? [Re: haulie]
Greg_Canada Offline
Roll Me Over
Registered: 08/25/03
Posts: 2853
Loc: Toronto, Canada
Here's a 4crawler link, get used to them (lol)
Gauge pod
_________________________
89 4Runner 3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim
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#847937 - 11/23/07 11:45 PM Re: air/fuel ratio gage in my 22r carbed engine? [Re: haulie]
4Crawler Offline

Web Wheeler
Registered: 01/12/00
Posts: 12150
Loc: N. California. USA
A quick web search will find lots of vacuum gauge information:
http://www.centuryperformance.com/vacuum.asp

Never had an A/F meter on a carbed engine but do have one on my 22RE. I find it rather handy for monitoring engine operation and finding optimal operating conditions. For example nice to find out if the ECU is running in open or closed loop mode in different gears up a grade.

I have had vacuum gauges on most every vehicle I have owned over the years. Good thing to check for a feeling of how hard the engine is working and if you have any extra power in reserve, like when pulling out to pass someone. If the gauge is down under 5" Hg, not much is going to happen when you mash the gas pedal down. The vacuum readings (and engine power) will vary with elevation and the gauge can help you see that power drop-off and you can adjust your driving accordingly.
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#847938 - 11/26/07 03:06 AM Re: air/fuel ratio gage in my 22r carbed engine? [Re: Greg_Canada]
Snowtoy Offline
Roll Me Over
Registered: 04/10/02
Posts: 3557
Loc: Grass Valley, CA
Quote:

A wideband o2 sensor would be nice but you probably dont want to spend that kind of money.
I'd install a vacuum gauge...



X2

The cheaper A/F gauge will only tell you if you are running rich or lean at any position, otherwise it will cycle between lean and rich in its normal operation. I imagine if the carb was running rich/lean at idle you could use the meter to tune the carb until the meter cycled between lean/rich.

I find mine usefull to keep from wasting fuel when taking off or climbing a hill and I don't need to have the throttle down, i.e., using just enough gas to accelerate w/o pegging the meter in the rich.
_________________________
More than tread lightly. Leave it like you were never there, nor anyone else. '90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction. '91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed
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#847939 - 11/28/07 11:31 PM Re: air/fuel ratio gage in my 22r carbed engine? [Re: Snowtoy]
dcg9381 Offline
Rock Warrior
Registered: 10/05/00
Posts: 669
Loc: Austin,TX
Just to note.. a "good" wideband will run you between $175-$200, you don't need a $350-$400 unit.

The LC-1 works great and can be hooked up to a narrowband gauge (programmable output) - the narrowband guage can then give you REAL air/fuel ratio.
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22REturbo.net 1988 4Runner 22RTE core, turbocharged, megasquirted...
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