Aeroforce Gauge Question
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From: MS
Aeroforce Gauge Question
I just bought an Aeroforce gauge and got it installed. I also recently installed a supercharger so I wanted to initially display boost and fuel pressure. I know these gauges are displaying what the PCM sees. It was strange to me that the fuel rail pressure parameter is displaying a negative number. Anybody on here have any experience with these parameters that might help me understand what that number means, what it should be and what values would indicate a problem?
Drifting
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I just bought an Aeroforce gauge and got it installed. I also recently installed a supercharger so I wanted to initially display boost and fuel pressure. I know these gauges are displaying what the PCM sees. It was strange to me that the fuel rail pressure parameter is displaying a negative number. Anybody on here have any experience with these parameters that might help me understand what that number means, what it should be and what values would indicate a problem?
Boost would need to be tapped into the vacuum line that the blow-off valve uses.
I went with the P3 Gauge as it it looks "factory" as it doesn't require a pillar gauge pod. I get boost, Air/Fuel ratio with my 02 sensor, EGT, IAT, plus all the other factory readouts (oil pressure, coolant, oil temp). Plus it logs the highest readouts
https://p3.io/products/p3-gauge-chev...50121925165362
Last edited by Pettrix; Yesterday at 11:35 AM.
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From: MS
Interesting.
My tuner asked me to change out my MAP sensor so we could get a boost reading to the computer so that is covered. I installed a 3 bar sensor, same as a ZR1 uses so that covers me on the boost. I would have thought the computer would see fuel pressure but I guess not. Curious that I am even getting a number at all.
The reason I would like to see fuel pressure is to make sure the boost a pump is coming on like it is supposed to and keeping everything good. I wonder if the air fuel ratio would be an indicator of that or maybe some other parameter?
My tuner asked me to change out my MAP sensor so we could get a boost reading to the computer so that is covered. I installed a 3 bar sensor, same as a ZR1 uses so that covers me on the boost. I would have thought the computer would see fuel pressure but I guess not. Curious that I am even getting a number at all.
The reason I would like to see fuel pressure is to make sure the boost a pump is coming on like it is supposed to and keeping everything good. I wonder if the air fuel ratio would be an indicator of that or maybe some other parameter?
Drifting
Joined: Apr 2020
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Interesting.
My tuner asked me to change out my MAP sensor so we could get a boost reading to the computer so that is covered. I installed a 3 bar sensor, same as a ZR1 uses so that covers me on the boost. I would have thought the computer would see fuel pressure but I guess not. Curious that I am even getting a number at all.
The reason I would like to see fuel pressure is to make sure the boost a pump is coming on like it is supposed to and keeping everything good. I wonder if the air fuel ratio would be an indicator of that or maybe some other parameter?
My tuner asked me to change out my MAP sensor so we could get a boost reading to the computer so that is covered. I installed a 3 bar sensor, same as a ZR1 uses so that covers me on the boost. I would have thought the computer would see fuel pressure but I guess not. Curious that I am even getting a number at all.
The reason I would like to see fuel pressure is to make sure the boost a pump is coming on like it is supposed to and keeping everything good. I wonder if the air fuel ratio would be an indicator of that or maybe some other parameter?
I use the air/fuel ratio monitor on my P3 gauge as a source to make sure the boost-a-pump is functioning and the engine is not leaning out during WOT. Best to have a video camera or a passenger watch the gauge during WOT as the driver should be watching the road and not the gauge during a pull.
If the 02 showed a lean condition then that means something is amiss and the engine is not getting enough fuel.
Last edited by Pettrix; Yesterday at 12:58 PM.
Pro
Joined: Oct 2024
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From: WI
A standard mechanical boost gauge would need a vacuum/boost hose connected to it, but an electronic gauge can read boost via your MAP sensor. MAP minus BARO equals Boost and this is how my scanner is set up to log boost without a mechanical gauge.
Pettrix is correct on the car lacking a fuel pressure sensor from the factory. To read fuel pressure you would need to add an aftermarket sensor and wire it to your gauge if it can handle separate inputs and not just CANBUS inputs.
Short of a dedicated fuel pressure gauge, the A/F gauge will tell you if you have enough fuel supply. If your boost a pump failed it would show too lean under boost.
Pettrix is correct on the car lacking a fuel pressure sensor from the factory. To read fuel pressure you would need to add an aftermarket sensor and wire it to your gauge if it can handle separate inputs and not just CANBUS inputs.
Short of a dedicated fuel pressure gauge, the A/F gauge will tell you if you have enough fuel supply. If your boost a pump failed it would show too lean under boost.
Drifting
Joined: Apr 2020
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You don't want to see 12.0 or higher under boost at WOT, as that means it's too lean and will be detonating. Under 11.0, then it is getting too rich, which won't hurt anything except you will lose some HP.
I ALWAYS recommend running a quality oil catch can like Improved Racing/Mighty Mouse, etc when running boost in a LS3. Oil vapors have an octane rating of 48 and they will be introduced into the combustion chamber, which then lowers your octane rating to lower numbers and you can detonate from that.
Trap the vapors in a catch can and it will keep your octane rating high and it will also keep your intake from getting oil deposits.
Last edited by Pettrix; Yesterday at 02:31 PM.
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Thread Starter
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Joined: Apr 2024
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From: MS
This is good information. Thanks so much. I also plan to use the graphing function on the gauge so I can see how it behaves under different conditions. That way I can build a history of the range.
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From: MS
Rats
Well, I tried using the air fuel parameter on the gauge and got no reading. I looked up parameter descriptions in the gauge manual and it says the A/F readings will only display if you have a wideband factory sensor so I guess the Corvettes don't have these. So now I cannot monitor the air fuel ratio either....
Kind of amazing to me that a high performance car does not have this kind of sensor. The PCM has to know what the air fuel ratio is, surely it is not some sort of calculated number.
Kind of amazing to me that a high performance car does not have this kind of sensor. The PCM has to know what the air fuel ratio is, surely it is not some sort of calculated number.
Last edited by GSGreen; Yesterday at 10:10 PM.
Drifting
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From: Chicago Illinois
St. Jude Donor '12
You can install a fuel pressure sensor on the driver’s side fuel rail and run the wire into the car under the dead pedal. Does require drilling a hole. Aeroforce sells the sensor.
Drifting
Joined: Apr 2020
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Well, I tried using the air fuel parameter on the gauge and got no reading. I looked up parameter descriptions in the gauge manual and it says the A/F readings will only display if you have a wideband factory sensor so I guess the Corvettes don't have these. So now I cannot monitor the air fuel ratio either....
Kind of amazing to me that a high performance car does not have this kind of sensor. The PCM has to know what the air fuel ratio is, surely it is not some sort of calculated number.
Kind of amazing to me that a high performance car does not have this kind of sensor. The PCM has to know what the air fuel ratio is, surely it is not some sort of calculated number.
- Two Upstream 02 Sensors: Located before the catalytic converters. They monitor the exhaust and adjust the engine's air-fuel ratio.
- Two Downstream 02 Sensors: Located after the catalytic converters. They monitor the efficiency of the cats themselves
The factory 02s read the air/fuel mixture before and after the cats and adjust as needed during part throttle or cruise. Once you go WOT, the factory ECU stops reading the 02s and goes by whatever the ECU was programmed by the tuner.
So the ECU does read the factory 02s but only when part throttle or lower. 3/4 or WOT, the 02s don't matter as computer goes by whoever programmed the tune.
Who tuned your setup? They should have drilled and tapped a bung BEFORE the cat (usually on drivers side) to do the tune. If they did, you can unscrew the cap and install a wide band 02. That's the way I have my setup...
Last edited by Pettrix; Today at 03:44 AM.