Dash replacement with data system
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Instructor
Joined: Jul 2012
Posts: 227
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Dash replacement with data system
Anybody here fully replaced their dash with a data acquisition system? If so, how are you measuring fuel from the two tanks?
I'm considering options - custom sensors can be tricky. Is it possible to take voltage straight from the sending units and merge/average the results?
I'm considering options - custom sensors can be tricky. Is it possible to take voltage straight from the sending units and merge/average the results?
Drifting
Joined: Apr 2003
Posts: 1,764
Likes: 31
From: Fort Collins CO
Subscribing for any answers.
I've replaced the PCM in my car with an AEM Infinity, and will be using an AiM EVO4 with an MXL for the dash, so the fuel level question is something that's occurred to me as well.
I've been presuming I would take voltage inputs of the two OEM fuel level sensors and then use a math channel to combine/merge/average the results as you proposed, and come up with some sort of number, but that's making a lot of suppositions...
-Jake
I've replaced the PCM in my car with an AEM Infinity, and will be using an AiM EVO4 with an MXL for the dash, so the fuel level question is something that's occurred to me as well.
I've been presuming I would take voltage inputs of the two OEM fuel level sensors and then use a math channel to combine/merge/average the results as you proposed, and come up with some sort of number, but that's making a lot of suppositions...
-Jake
Melting Slicks
Joined: Sep 2007
Posts: 3,155
Likes: 45
From: Merced California
I only have an MXL2 dash now. The dash shows Left Tank level and Right Tank level separately. It's kind of cool seeing how they change while the engine is running. I don't really see a need to average the two, but it probably can be done. If my left tank reads 50% and the right tank reads 0% then I know I have a 1/4 tank.
Pro
Joined: Aug 2006
Posts: 666
Likes: 28
From: Saratoga Springs NY
I only have an MXL2 dash now. The dash shows Left Tank level and Right Tank level separately. It's kind of cool seeing how they change while the engine is running. I don't really see a need to average the two, but it probably can be done. If my left tank reads 50% and the right tank reads 0% then I know I have a 1/4 tank.
Safety Car
Joined: Jan 2005
Posts: 3,781
Likes: 14
From: Phoenixville, PA
Depending on your ECU - some will output a fuel used signal (which may need to be tuned), which makes a lot of sense on the track b/c you will need to average the fuel level sensors over a long period of time for any accuracy (or take a reading when g's are low).
You can take the signal from the senders, but a pull-up resistor needs to be added (unless your ECU/data system has an integrated pull-up) as they are resistance sensors (like a coolant sensor).
If you use both fuel level sensors, you should be able to apply a math function to the two signals if you want to determine the total fuel remaining.
You can take the signal from the senders, but a pull-up resistor needs to be added (unless your ECU/data system has an integrated pull-up) as they are resistance sensors (like a coolant sensor).
If you use both fuel level sensors, you should be able to apply a math function to the two signals if you want to determine the total fuel remaining.
Melting Slicks
Joined: Jan 2008
Posts: 2,535
Likes: 379
From: NSL UT
Originally Posted by FuriousDonuts
Anybody here fully replaced their dash with a data acquisition system? If so, how are you measuring fuel from the two tanks?
I'm considering options - custom sensors can be tricky. Is it possible to take voltage straight from the sending units and merge/average the results?
I'm considering options - custom sensors can be tricky. Is it possible to take voltage straight from the sending units and merge/average the results?
datamotorsports.com
Last edited by z06801; Feb 4, 2016 at 10:56 AM.
Burning Brakes
Joined: Jun 2011
Posts: 871
Likes: 53
From: North White Plains NY
I'm actually undertaking this shortly as well with an AIM MXG. I'd like to hear if anyone has worked this out as well. I actually hate to use (2) analog inputs for one function like fuel level.
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Racer
Joined: Sep 2006
Posts: 424
Likes: 25
From: Central VA
What about finding a way to combine the resistance of the two tank sender units, then use a custom programmable unit suck as this:
http://www.stackltd.com/instruments.html#
http://www.stackltd.com/instruments.html#
Racer
Joined: Sep 2006
Posts: 424
Likes: 25
From: Central VA
Also, check out this thread on how to wire up to an aftermarket gauge.
substitute the aftermarket gauge for an analog in with the AIM MXG (include pull-up resistor) - use an ON-ON toggle switch and check the fuel level independently of the two tanks.
https://www.corvetteforum.com/forums...ks-how-to.html
substitute the aftermarket gauge for an analog in with the AIM MXG (include pull-up resistor) - use an ON-ON toggle switch and check the fuel level independently of the two tanks.
https://www.corvetteforum.com/forums...ks-how-to.html
Racer
Joined: Nov 2008
Posts: 430
Likes: 5
From: Florida
we just run an aftermarket analog gauge and have a toggle switch on it for left and right. The fuel gets pumped from one tank to the other and then to the engine. (I don't recall if its passenger side or drivers side tank that sends the fuel to the engine)... usually leave the gauge on the fuel tank that goes to the engine as that's the one that matters while you are running. - so when our gauge shows full on gauge for the one tank the car is half full.
Burning Brakes
Joined: Jun 2011
Posts: 871
Likes: 53
From: North White Plains NY
Maybe this a dumb statement (and maybe even worse coming from me since I'm an electrical contractor) but why not just parallel the two sending units, take voltage measurement full and measurements empty and use these values to indicate level?
Racer
Joined: Sep 2006
Posts: 424
Likes: 25
From: Central VA
Hi Volts Z06 - did you implement a solution with your MXG?
Burning Brakes
Joined: Jun 2011
Posts: 871
Likes: 53
From: North White Plains NY
Unfortunately the project got cut short. A blown engine and resulting engine fire necessitated a complete rebuild of the car. Since I’m going only be using about 4 of the 8 analog inputs for the rebuild (I’m rewriting the whole car using the GM stand alone ECU therefore most inputs will be via CAN bus) I will have plenty of inputs available for this endeavor. Check out my build thread here https://www.corvetteforum.com/forums...ld-thread.html and check back soon as we should be starting the rewriting portion shortly.
Supporting Vendor
Joined: Dec 2015
Posts: 1,296
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From: Cresson TX
We are retrofitting a C5 with a Motec M130 ecu and C127 digital display logger. The fuel level has been on the radar, fortunately for you guys, it has to be done in less than a month.
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http://www.gspeed.com
877-512-5180
Instagram_Facebook_YouTube
GSpeed C7Z Cooling Development
2014 NASA Texas TT1 Champion
2015 NASA Texas ST1 Champion
2018 NASA TTU & TT3 National Champions
2019 NASA ST2 National Champion
2019 NASA Texas TT2 Champion
2020 SCCA Majors COTA GT2 pole sitter
2020 SCCA Trans Am Road Atlanta SGT Winner
2022 NASA National Champion ST2
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Burning Brakes
Joined: Jul 2003
Posts: 843
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From: Laguna Hills CA
Currently using an IQ3 piggy backed on the factory ECU, and will be replacing with an MXG. Car is a '08 Z06. Thankfully fuel level appears to be available via CAN, however came across this CAN fuel sender interface while researching.
YMMV, I've not had a chance to play with one yet, but seems as though it's a bit better option that just using an analog channel.
YMMV, I've not had a chance to play with one yet, but seems as though it's a bit better option that just using an analog channel.
Supporting Vendor
Joined: Dec 2015
Posts: 1,296
Likes: 858
From: Cresson TX
Currently using an IQ3 piggy backed on the factory ECU, and will be replacing with an MXG. Car is a '08 Z06. Thankfully fuel level appears to be available via CAN, however came across this CAN fuel sender interface while researching.
YMMV, I've not had a chance to play with one yet, but seems as though it's a bit better option that just using an analog channel.
YMMV, I've not had a chance to play with one yet, but seems as though it's a bit better option that just using an analog channel.
Instructor
Joined: Jul 2011
Posts: 126
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From: Broken Arrow Oklahoma
