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haulie
Getting the Wheeling Fever


Reged: 06/24/07
Posts: 29
air/fuel ratio gage in my 22r carbed engine?
      #1055026 - 11/20/07 02:04 AM

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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fourwd1
Body Damage is Cool


Reged: 02/16/01
Posts: 1681
Loc: Baltimore, MD USA
Re: air/fuel ratio gage in my 22r carbed engine? [Re: haulie]
      #1055396 - 11/21/07 09:41 AM

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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dcg9381
Rock Warrior


Reged: 10/05/00
Posts: 669
Loc: Austin,TX
Re: air/fuel ratio gage in my 22r carbed engine? [Re: fourwd1]
      #1055400 - 11/21/07 09:49 AM

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.

--------------------
22REturbo.net




1988 4Runner
22RTE core, turbocharged, megasquirted...


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Greg_Canada
Roll Me Over


Reged: 08/25/03
Posts: 2847
Loc: Toronto, Canada
Re: air/fuel ratio gage in my 22r carbed engine? [Re: dcg9381]
      #1055410 - 11/21/07 10:07 AM

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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haulie
Getting the Wheeling Fever


Reged: 06/24/07
Posts: 29
Re: air/fuel ratio gage in my 22r carbed engine? [Re: Greg_Canada]
      #1055438 - 11/21/07 10:50 AM

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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Greg_Canada
Roll Me Over


Reged: 08/25/03
Posts: 2847
Loc: Toronto, Canada
Re: air/fuel ratio gage in my 22r carbed engine? [Re: haulie]
      #1055450 - 11/21/07 11:36 AM

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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4CrawlerModerator
Toyota 4-Wheeling Forum Moderator


Reged: 01/12/00
Posts: 12148
Loc: N. California. USA
Re: air/fuel ratio gage in my 22r carbed engine? [Re: haulie]
      #1056085 - 11/23/07 11:45 PM

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.

--------------------
[email protected]
[email protected]
Project: 4Crawler
4Crawler OffRoad - 4x4Wire discount code


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Snowtoy
Roll Me Over


Reged: 04/10/02
Posts: 3549
Loc: Grass Valley, CA
Re: air/fuel ratio gage in my 22r carbed engine? [Re: Greg_Canada]
      #1056489 - 11/26/07 03:06 AM

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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dcg9381
Rock Warrior


Reged: 10/05/00
Posts: 669
Loc: Austin,TX
Re: air/fuel ratio gage in my 22r carbed engine? [Re: Snowtoy]
      #1057308 - 11/28/07 11:31 PM

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.

--------------------
22REturbo.net




1988 4Runner
22RTE core, turbocharged, megasquirted...


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