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Old 06-03-2008, 03:42 PM
   A/F and Voltage Ratio Question
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I am hooking up a wideband this weekend and here is the information I need to know for the GXP:

At an A/F ratio of 10, what is the voltage at the wideband low signal sensor (tan wire, pin 2)?

At an A/F ratio of 18, what is that same voltage?


I need this information to program the wideband gauge to work with the stock sensor.

Thanks in advance.
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Old 06-03-2008, 05:05 PM
  
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Our cars never hit those a/f ratios so its just a guessing game.
Also im sure if you tap into the stock wideband you'll mess up the readings, why not just use a dashhawk to monitor the stock wideband?
Otherwise just add the second wideband sensor that came with your gauge right after the stock one.
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Old 06-03-2008, 06:16 PM
  
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Quote:
Originally Posted by shabby View Post
Our cars never hit those a/f ratios so its just a guessing game.
Also im sure if you tap into the stock wideband you'll mess up the readings, why not just use a dashhawk to monitor the stock wideband?
Otherwise just add the second wideband sensor that came with your gauge right after the stock one.

Well the gentleman from the gauge company told me that it is a straight line graph between the voltage and A/F, and all they need to configure the gauge is the voltage at a high and low point. Is that info around anywhere?

Also, do wideband gauges come with an extra sensor?
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Old 06-03-2008, 08:51 PM
  
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Shabby...sent you a PM.
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Old 06-04-2008, 12:07 AM
  
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1v=10.6 a/f ratio
0.95v=11.6 a/f
0.75v=16.2 a/f

and in general rich:0.7v-1.1v lean:0.0v-0.3v
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Old 06-04-2008, 04:48 PM
  
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Originally Posted by spiky3480 View Post
Well the gentleman from the gauge company told me that it is a straight line graph between the voltage and A/F, and all they need to configure the gauge is the voltage at a high and low point. Is that info around anywhere?

Also, do wideband gauges come with an extra sensor?

I guess I am nosy also, why would you add a wideband when you already have one. Secondly, if you are looking at a simple analog out, I would guess the accuracy of the system is suspect, an accurate a/f number is more about the algorithms used to derive the values, then the hardware. Go to the Innovate site and read the article that compares multiple systems.I believe the article came from Hotrod Magazine.
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Old 06-04-2008, 06:40 PM
  
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I guess I am nosy also, why would you add a wideband when you already have one. Secondly, if you are looking at a simple analog out, I would guess the accuracy of the system is suspect, an accurate a/f number is more about the algorithms used to derive the values, then the hardware. Go to the Innovate site and read the article that compares multiple systems.I believe the article came from Hotrod Magazine.

I decided to go with an exhaust gas temp gauge.
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Old 06-04-2008, 08:39 PM
  
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I decided to go with an exhaust gas temp gauge.

Theres no use for an egt on our cars, i'd get an oil pressure gauge first.
Besides unless you plan on taking the exhaust manifold out to tap it, thers a good chance some shavings might get into the turbo... crunch crunch turbine wheel goes poof.
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Old 06-05-2008, 05:36 AM
  
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Theres no use for an egt on our cars, i'd get an oil pressure gauge first.
Besides unless you plan on taking the exhaust manifold out to tap it, thers a good chance some shavings might get into the turbo... crunch crunch turbine wheel goes poof.

My installer has a magnetized drill bit for that purpose. He knew about that and said it would be no problem.
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Old 06-06-2008, 05:17 PM
  
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Theres no use for an egt on our cars, i'd get an oil pressure gauge first.
Besides unless you plan on taking the exhaust manifold out to tap it, thers a good chance some shavings might get into the turbo... crunch crunch turbine wheel goes poof.

Has anyone successfully installed an oil pressure gauge in a GXP? I found the oil gallery plugs. It has to be done on the drivers side, the passenger side heat would kill the transducer. The drivers side has both the oil gallery plugs and the oem oil pressure switch. The oil gallery plugs appear to be torqued and locktited. All you can get into them is a small allen key wrench which doesn't allow enough torque to break them loose. The oil pressure switch is behind the starter and it looks like the engine has to be lifted to remove the starter
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Old 06-06-2008, 05:20 PM
  
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Has anyone successfully installed an oil pressure gauge in a GXP? I found the oil gallery plugs. It has to be done on the drivers side, the passenger side heat would kill the transducer. The drivers side has both the oil gallery plugs and the oem oil pressure switch. The oil gallery plugs appear to be torqued and locktited. All you can get into them is a small allen key wrench which doesn't allow enough torque to break them loose. The oil pressure switch is behind the starter and it looks like the engine has to be lifted to remove the starter

Exactly why I went with an EGT gauge instead. At least I'll have a general idea of whether I'm running lean or rich.
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Old 06-06-2008, 05:28 PM
  
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Exactly why I went with an EGT gauge instead. At least I'll have a general idea of whether I'm running lean or rich.

I don't know why Shabby thinks an EGT won't work. BTF partially developed the tune on his turbo upgrade with EGT's. Relative temperature differentials or max values would seem very enlightening.
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Old 06-06-2008, 06:25 PM
  
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I don't know why Shabby thinks an EGT won't work. BTF partially developed the tune on his turbo upgrade with EGT's. Relative temperature differentials or max values would seem very enlightening.

That's what my installer said to me...he said some tuning is done with these gauges. I'm happy with the choice.
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Old 06-06-2008, 06:38 PM
  
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Old 06-06-2008, 07:20 PM