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codesx codesx is online now
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Posts: 679
Join Date: Feb 2018
Car: 2008 335i Vert (E93, N54)
Default Electrical Sensor, low meth in tank - 07-26-2019, 06:44 PM

I'm wondering if there is already a common solution to this.
We don't want to run out of meth under max load.
How best to be alerted when it's below a defined level?

I'm planning on two probes (contacts) that will run through the side of the meth tank. (Easy to seal I've found)
Then the resistance is verified, and when it's high, we are alerted to low meth (no longer bridging the two electrodes)
This is very common for water alerts in house (I use by washing machine and furnace).

I want the inverse of this logic, where it alerts upon lack of fluid.
Power is easy.
Maybe an LED visible in the rearview mirror.

Who's already done this and can suggest the parts?
Or do I just build adhoc?

My guess, the base components will be very cheap.

Thoughts?


--

2008 335i Convertible, E93, N54, A/T (190,000+ km)
Wheels: 322 | Tires: R.275/35r18, F.245/40r18
TUNE: JB4/Trebila | 24 PSI | 100% Meth via dual BM5 | 94 Octane
BMS: JB4, Map 6 | WMI | 5" FMIC | OCC | DCI | Cowel Filters
TMAP: 3.5 barr
xHP Stage 3 (v2.0)
VRSF CP | HKS BOV
RB PCV Valve
NGK 5992 Plugs @ .020

Maintenance:
2018 - A/T Replaced | Plugs | Ign Coils | Walnut Blasting
2019 - Index 12 Injectors | VCG | OFHG & O-rings | Alternator w/ Clutch Pulley | Water Pump & TStat
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Fredm21 Fredm21 is offline
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Posts: 81
Join Date: Apr 2019
Car: Bmw 335i 2007 N54
Default 07-28-2019, 06:11 AM

Quote:
Originally Posted by codesx
I'm wondering if there is already a common solution to this.
We don't want to run out of meth under max load.
How best to be alerted when it's below a defined level?

I'm planning on two probes (contacts) that will run through the side of the meth tank. (Easy to seal I've found)
Then the resistance is verified, and when it's high, we are alerted to low meth (no longer bridging the two electrodes)
This is very common for water alerts in house (I use by washing machine and furnace).

I want the inverse of this logic, where it alerts upon lack of fluid.
Power is easy.
Maybe an LED visible in the rearview mirror.

Who's already done this and can suggest the parts?
Or do I just build adhoc?

My guess, the base components will be very cheap.

Thoughts?
will be doing this on mine next week,

Going to use a Horizontal-Mount Float Switch
and for the alarm I will go with a Miniature Buzzer in the trunk, with a pulse sound patern.


-07 335i coupe
BMS charge pipe
Turbosmart BOV
VRSF down pipe
BMS WMI with single nozzle ( 10 )
JB4 map 3 w/bluetooth & antiliag
Afe intake filter
BMS intercooler
BMS tranny cooler
BMS Double baffle catch can
MHD BEF Racegas
Precision Raceworks Coil
-Running 91 octane with WMI

Last edited by Fredm21; 07-28-2019 at 06:35 AM..
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(#3)
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codesx codesx is online now
Senior Member
 
Posts: 679
Join Date: Feb 2018
Car: 2008 335i Vert (E93, N54)
Default 07-29-2019, 09:45 AM

Quote:
Originally Posted by Fredm21
will be doing this on mine next week,

Going to use a Horizontal-Mount Float Switch
and for the alarm I will go with a Miniature Buzzer in the trunk, with a pulse sound patern.

Fun.
How will you mount the float in the tank?
I'm thinking probes through the side wall and sealed correctly would be less invasive, and hopefully less maintenance.
What logic device will you use to limit the presumed indefinite audible alarming when the fluid is low?

When you get done, post pictures here
I'll do the same!


--

2008 335i Convertible, E93, N54, A/T (190,000+ km)
Wheels: 322 | Tires: R.275/35r18, F.245/40r18
TUNE: JB4/Trebila | 24 PSI | 100% Meth via dual BM5 | 94 Octane
BMS: JB4, Map 6 | WMI | 5" FMIC | OCC | DCI | Cowel Filters
TMAP: 3.5 barr
xHP Stage 3 (v2.0)
VRSF CP | HKS BOV
RB PCV Valve
NGK 5992 Plugs @ .020

Maintenance:
2018 - A/T Replaced | Plugs | Ign Coils | Walnut Blasting
2019 - Index 12 Injectors | VCG | OFHG & O-rings | Alternator w/ Clutch Pulley | Water Pump & TStat
Reply With Quote
(#4)
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Fredm21 Fredm21 is offline
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Posts: 81
Join Date: Apr 2019
Car: Bmw 335i 2007 N54
Default 07-29-2019, 04:27 PM

Quote:
Originally Posted by codesx
Fun.
How will you mount the float in the tank?
I'm thinking probes through the side wall and sealed correctly would be less invasive, and hopefully less maintenance.
What logic device will you use to limit the presumed indefinite audible alarming when the fluid is low?

When you get done, post pictures here
I'll do the same!
The float will be mounted thru the wall, 1/2 hole diameter. Will be a chemical resistant float so no maintenance.

As soon as the fluid is low, once the float goes ( NC ) it will send 12v to the alarm until I refill. If itís too annoying will add a timer to it so it stops beeping for a certain amount of time.


-07 335i coupe
BMS charge pipe
Turbosmart BOV
VRSF down pipe
BMS WMI with single nozzle ( 10 )
JB4 map 3 w/bluetooth & antiliag
Afe intake filter
BMS intercooler
BMS tranny cooler
BMS Double baffle catch can
MHD BEF Racegas
Precision Raceworks Coil
-Running 91 octane with WMI
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(#5)
Old
codesx codesx is online now
Senior Member
 
Posts: 679
Join Date: Feb 2018
Car: 2008 335i Vert (E93, N54)
Default 07-31-2019, 09:41 AM

Nice! I'm looking forward to pictures

I'm still sourcing the ideal (and low cost) logic system for resistance based trigger. Almost all are designed to default to dry and trigger wet. Not all have easily invertable logic.


--

2008 335i Convertible, E93, N54, A/T (190,000+ km)
Wheels: 322 | Tires: R.275/35r18, F.245/40r18
TUNE: JB4/Trebila | 24 PSI | 100% Meth via dual BM5 | 94 Octane
BMS: JB4, Map 6 | WMI | 5" FMIC | OCC | DCI | Cowel Filters
TMAP: 3.5 barr
xHP Stage 3 (v2.0)
VRSF CP | HKS BOV
RB PCV Valve
NGK 5992 Plugs @ .020

Maintenance:
2018 - A/T Replaced | Plugs | Ign Coils | Walnut Blasting
2019 - Index 12 Injectors | VCG | OFHG & O-rings | Alternator w/ Clutch Pulley | Water Pump & TStat
Reply With Quote
(#6)
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ewicky ewicky is offline
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Posts: 18
Join Date: Jan 2017
Car: 07 335xi, 98 A4 2.8 Quattro
Default 09-04-2019, 04:04 PM

Personally, I'd wire it in to piggyback off an existing check control sensor, such as lower wiper fluid, low coolant, etc. Super stealth. Of course, leave the stock sensor intact too so you get those warnings as well.
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ewicky ewicky is offline
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Posts: 18
Join Date: Jan 2017
Car: 07 335xi, 98 A4 2.8 Quattro
Default 09-04-2019, 04:05 PM

Logic can be accomplished with DT relays if you're not into soldering ICs
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ewicky ewicky is offline
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Posts: 18
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Car: 07 335xi, 98 A4 2.8 Quattro
Default 09-04-2019, 04:09 PM

Quote:
Originally Posted by ewicky
Personally, I'd wire it in to piggyback off an existing check control sensor, such as lower wiper fluid, low coolant, etc. Super stealth. Of course, leave the stock sensor intact too so you get those warnings as well.
Heck, you could even have the relay inline with, say, a reverse light or license plate light. It would throw a check control message for reverse light bulb burnt, but you would know that means time for more meth.
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