measuring air/fuel ratio with gauge good enough?
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From: Ca, usa
measuring air/fuel ratio with gauge good enough?
hey guys,
im about to start up my newly rebuilt b18c1 motor. Heard alot of horror stories about running to rich or too lean will really damage my motor. i have a aem fuel presure regulator and b@m fuel pressure gauge already. I cant afford a wideband 02 sensor for adjustments so will a regular a/f gauge be adequate just to measure that im not too lean or rich?. what do you guys think. Thanks
im about to start up my newly rebuilt b18c1 motor. Heard alot of horror stories about running to rich or too lean will really damage my motor. i have a aem fuel presure regulator and b@m fuel pressure gauge already. I cant afford a wideband 02 sensor for adjustments so will a regular a/f gauge be adequate just to measure that im not too lean or rich?. what do you guys think. Thanks
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From: los banos, ca
Re: measuring air/fuel ratio with gauge good enough? (athoughts)
the stock narrowband o2 sensor can not be used for tuning.
take it from someone who owns a wideband...get one before you start your motor...a poor tune can kill a motor faster then anything.....to rich and cylinder walls get washed and rings wont seal for ****....to lean and pistons over expand and wow damage city to both the pistons and cylinder walls...
cost of new motor= $$$
cost of wideband = $200-400 depending on features
take it from someone who owns a wideband...get one before you start your motor...a poor tune can kill a motor faster then anything.....to rich and cylinder walls get washed and rings wont seal for ****....to lean and pistons over expand and wow damage city to both the pistons and cylinder walls...
cost of new motor= $$$
cost of wideband = $200-400 depending on features
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Re: measuring air/fuel ratio with gauge good enough? (ubreak_ubuy)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ubreak_ubuy »</TD></TR><TR><TD CLASS="quote">hey guys,
im about to start up my newly rebuilt b18c1 motor. Heard alot of horror stories about running to rich or too lean will really damage my motor. i have a aem fuel presure regulator and b@m fuel pressure gauge already. I cant afford a wideband 02 sensor for adjustments so will a regular a/f gauge be adequate just to measure that im not too lean or rich?. what do you guys think. Thanks </TD></TR></TABLE>
the narrowbands are more accurate around the 14.7:1 ratios ... just keep it tont he slightly rich side until you can do extensive tunign with a wideband.
Greg
im about to start up my newly rebuilt b18c1 motor. Heard alot of horror stories about running to rich or too lean will really damage my motor. i have a aem fuel presure regulator and b@m fuel pressure gauge already. I cant afford a wideband 02 sensor for adjustments so will a regular a/f gauge be adequate just to measure that im not too lean or rich?. what do you guys think. Thanks </TD></TR></TABLE>
the narrowbands are more accurate around the 14.7:1 ratios ... just keep it tont he slightly rich side until you can do extensive tunign with a wideband.
Greg
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From: los banos, ca
Re: measuring air/fuel ratio with gauge good enough? (CHEETAH)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CHEETAH »</TD></TR><TR><TD CLASS="quote">
the narrowbands are more accurate around the 14.7:1 ratios ... just keep it tont he slightly rich side until you can do extensive tunign with a wideband.
Greg</TD></TR></TABLE>
http://forum.pgmfi.org/viewtop...uning
narrowband cant be used for tuning. anyone who tells you otherwise is wrong
NB sensor readings also fuctuate drastically with temperature. The change from idle to full throttle can cause this. They have a wide voltage range that indicates if you are at, or very nearly at, 14.7 and then past that any data you get is a massive sweep. Generally speaking readings above .8 could mean anything from 14.0:1 to 10.0:1 depending on conditions, and even if conditions were stable the sensor is far too basic to statistically use it's data.
the narrowbands are more accurate around the 14.7:1 ratios ... just keep it tont he slightly rich side until you can do extensive tunign with a wideband.
Greg</TD></TR></TABLE>
http://forum.pgmfi.org/viewtop...uning
narrowband cant be used for tuning. anyone who tells you otherwise is wrong
NB sensor readings also fuctuate drastically with temperature. The change from idle to full throttle can cause this. They have a wide voltage range that indicates if you are at, or very nearly at, 14.7 and then past that any data you get is a massive sweep. Generally speaking readings above .8 could mean anything from 14.0:1 to 10.0:1 depending on conditions, and even if conditions were stable the sensor is far too basic to statistically use it's data.
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From: Charlotte, NC
Re: measuring air/fuel ratio with gauge good enough? (ubreak_ubuy)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ubreak_ubuy »</TD></TR><TR><TD CLASS="quote">I cant afford a wideband 02 sensor for adjustments </TD></TR></TABLE>
Then you must be able to afford:
1. Towing it to the dyno and breaking it in there
or
2. Another rebuild or engine
It's an investment that you will use continually and will pay off.
Then you must be able to afford:
1. Towing it to the dyno and breaking it in there
or
2. Another rebuild or engine
It's an investment that you will use continually and will pay off.
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From: San Diego, CA, USA
Re: measuring air/fuel ratio with gauge good enough? (drdisco69)
hey since ive put my B@M fpr and gauge in ive been messin with it just by the gauge and teh a/f gauge...
its set on about 38/40 psi and seems to idle in the same pattern and run the same according to my gauge before and after the b@m...
but a question that i have is on the VAFC..
the Pressure is different, around 7,500rpm it is down to around -10 /2 .. when befoer it would stay in the -hundreds
what are those numbers reading actually? what is it suppost to be?
thanks
its set on about 38/40 psi and seems to idle in the same pattern and run the same according to my gauge before and after the b@m...
but a question that i have is on the VAFC..
the Pressure is different, around 7,500rpm it is down to around -10 /2 .. when befoer it would stay in the -hundreds
what are those numbers reading actually? what is it suppost to be?
thanks
Thread Starter
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Joined: Mar 2004
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From: Ca, usa
Re: measuring air/fuel ratio with gauge good enough? (athoughts)
well im not planning on tuning the motor just yet. I just want to make sure that my a/f ratio is good for the first few 100 miles of break in. so do you guys think as long as it reads stoich, maybe alittle on the rich side, that ill be ok without damage to my motor? TIA
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From: los banos, ca
Re: measuring air/fuel ratio with gauge good enough? (ubreak_ubuy)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ubreak_ubuy »</TD></TR><TR><TD CLASS="quote">well im not planning on tuning the motor just yet. I just want to make sure that my a/f ratio is good for the first few 100 miles of break in. so do you guys think as long as it reads stoich, maybe alittle on the rich side, that ill be ok without damage to my motor? TIA</TD></TR></TABLE>
did you not read the posts above?
just in case you missed it here it is again
"NB sensor readings also fuctuate drastically with temperature. The change from idle to full throttle can cause this. They have a wide voltage range that indicates if you are at, or very nearly at, 14.7 and then past that any data you get is a massive sweep. Generally speaking readings above .8 could mean anything from 14.0:1 to 10.0:1 depending on conditions, and even if conditions were stable the sensor is far too basic to statistically use it's data. "
now if you read that and understand it then you would know that stioch on your gauge could really mean rich or lean depending on conditions and you have no way of telling without wideband...that gauge is WORTHLESS without wideband
did you not read the posts above?
just in case you missed it here it is again
"NB sensor readings also fuctuate drastically with temperature. The change from idle to full throttle can cause this. They have a wide voltage range that indicates if you are at, or very nearly at, 14.7 and then past that any data you get is a massive sweep. Generally speaking readings above .8 could mean anything from 14.0:1 to 10.0:1 depending on conditions, and even if conditions were stable the sensor is far too basic to statistically use it's data. "
now if you read that and understand it then you would know that stioch on your gauge could really mean rich or lean depending on conditions and you have no way of telling without wideband...that gauge is WORTHLESS without wideband
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From: San Diego, CA, USA
Re: measuring air/fuel ratio with gauge good enough? (2k.civic.si)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by athoughts »</TD></TR><TR><TD CLASS="quote">hey since ive put my B@M fpr and gauge in ive been messin with it just by the gauge and teh a/f gauge...
its set on about 38/40 psi and seems to idle in the same pattern and run the same according to my gauge before and after the b@m...
but a question that i have is on the VAFC..
the Pressure is different, around 7,500rpm it is down to around -10 /2 .. when befoer it would stay in the -hundreds
what are those numbers reading actually? what is it suppost to be?
thanks </TD></TR></TABLE>
its set on about 38/40 psi and seems to idle in the same pattern and run the same according to my gauge before and after the b@m...
but a question that i have is on the VAFC..
the Pressure is different, around 7,500rpm it is down to around -10 /2 .. when befoer it would stay in the -hundreds
what are those numbers reading actually? what is it suppost to be?
thanks </TD></TR></TABLE>
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From: FIVE.ZERO.THREE
Re: measuring air/fuel ratio with gauge good enough? (CHEETAH)
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Joined: Jan 2004
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From: Charlotte, NC
Re: measuring air/fuel ratio with gauge good enough? (ubreak_ubuy)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ubreak_ubuy »</TD></TR><TR><TD CLASS="quote">do you guys think as long as it reads stoich, maybe alittle on the rich side, that ill be ok without damage to my motor?</TD></TR></TABLE>
The general opinion seems to be no.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by athoughts »</TD></TR><TR><TD CLASS="quote">a lil bump! </TD></TR></TABLE>
Stop thread jacking please.
The general opinion seems to be no.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by athoughts »</TD></TR><TR><TD CLASS="quote">a lil bump! </TD></TR></TABLE>
Stop thread jacking please.
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