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Old 09-12-2006, 02:28 AM   #1
Ben Crowson
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Default Flow sensor placement

I am in the process of putting together a single stage diy kit for my stage 2+ wrx. 50/50 meth mix- will be using 150 psi shurflo pump rated for meth, 3 filters in all, pressure gauge, tank level sensor, solenoid (simple boost actuated at first- not sold on the utility of a boost based progressive controller yet due stock turbo/injectors with my setup and research I have done). My question is- where should I place the adjustable flow monitors I purchased: http://www.flw.com/chemtec/chemtec.htm
I got the 316ss ones by the way- rated to 3000 psi, 220 degrees, etc-
I got two - one normally open, one closed- I plan on using one for low flow and one for sensing high flow i guess (clogged injector). Picked them up brand new for 25 bucks so I hope I can integrate them in to the system- if not they were cheap
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Old 09-12-2006, 03:27 AM   #2
Richard L
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You are taking the WI failsafe very seriously.

Flow switch can be placed anywhere along the delivery line. There is a better chance of it working more consistanly if it were placed on the pressurised side of the pump rather than the suction side.

Richard
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Old 09-12-2006, 05:48 AM   #3
Ben Crowson
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I was thinking one between the pump and solenoid and one between solenoid and nozzle- they would have to be activated when the solenoid is activated since they are flow based units and not pressure switches (ie there is no flow in pressurized line between pump and solenoid when solenoid closed).
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Old 09-12-2006, 06:28 AM   #4
hippy
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What are you running for engine management? How do you plan to use the sensors(are they controlling things other then lights?)? Which sensors did you get, and do they always cost $25? Just askin cause if they do, I want to link em up to the diy thread....

Last edited by hippy; 09-12-2006 at 07:05 AM.
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Old 09-12-2006, 09:46 AM   #5
Ben Crowson
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I am running a plug and play unichip with dual maps and boost control(oldschool I know but its a 2002 wrx ) I will have the sensors switch maps once I get the system up and running and calibrated properly as well as get the meth map tuned and loaded on the unichip. The sensors are the 125 series adjustable flow sensors in stainless steel- I have no clue what they cost normally as I got them on EBAY - they were brand new sealed in factory packaging so maybe they will have an msrp on them or something.
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Old 09-12-2006, 11:16 AM   #6
dibblejr
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I would suggest you put one in between the pump and the injector and keep the other as a spare.
This is where if you are tuned for meth and have advanced your timing to help produce more boost if there is no liquid flowing will do the most damage. ( destroy your engine)
One on both sides of the pump is over kill IMO.
Also on a side note, I have a solenoid and boost switch from my coolingmist kit that I would be willing to part with and is advertised in the for sale threads.

Jay-R

Quote:
Originally Posted by Ben Crowson View Post
I was thinking one between the pump and solenoid and one between solenoid and nozzle- they would have to be activated when the solenoid is activated since they are flow based units and not pressure switches (ie there is no flow in pressurized line between pump and solenoid when solenoid closed).
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Old 09-12-2006, 03:32 PM   #7
hippy
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You could set your sensors up many ways, but this is what I'd do if I was you. I'd use 1 flow switch, and mount it in a cool place because it's max temp rating is 220F(from what the website says). I'd also have a pressure switch tapped into the feed line as close to the nozzle as possible. The flow switch would detect that everything is moving, and the pressure switch would detect that there isn't a problem with pressure getting near the nozzle. This way(if everything is setup right), the only thing that could go wrong(as far as I know) with your system without the sensors detecting it would be if there was a leak in the tubing between where ya tapped the pressure switch in, and the nozzle. I'm not really sure how you're going to be able to use the switches to change maps though, and it might be a hard task.

peace

Last edited by hippy; 09-12-2006 at 04:33 PM.
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Old 09-12-2006, 10:59 PM   #8
Ben Crowson
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Quote:
Originally Posted by dibblejr View Post
I would suggest you put one in between the pump and the injector and keep the other as a spare.
This is where if you are tuned for meth and have advanced your timing to help produce more boost if there is no liquid flowing will do the most damage. ( destroy your engine)
One on both sides of the pump is over kill IMO.
Also on a side note, I have a solenoid and boost switch from my coolingmist kit that I would be willing to part with and is advertised in the for sale threads.

Jay-R
The plan was to use both after the pump- never planned to put one before the pump- if you read my post I was talking about putting one after the pump but before the solenoid and one between solenoid and nozzle - this way I could detect pump as well as possible solenoid failure- ie low flow. I do however agree- one flow switch and a pressure switch at nozzle would be ideal- anyone know of a good cheap pressure switch?

Hippy- Thanks for the input- right now I switch maps with a simple rocker switch on the dash- I assume if voltage goes to one side of switch it is map A........and if voltage goes to the other side of the switch it is map B?? I will have to find out from gpmoto how exactly the map switching is accomplished and what voltages and all. The unichip also has a separte tunable driver for solenoids and extra injectors etc- so I need to find out if I can just drive the solenoid with this instead of boost switch- it may be a 0-5volt thing though in which case wouldnt the solenoid only be activated by 12 volts?
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Old 09-12-2006, 11:16 PM   #9
hippy
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You sure you don't have a utec? As far as I know, unichips never had switchable maps or a solenoid driver(could be wrong). With the utec, you can change maps while the rpm is below something like 1500. This would not help you switch maps if something happens above 1500rpm. You could use the flow and/or pressure switch to try and limit boost, or just give you a warning so you get off the throttle(or both, or other things...).

peace
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Old 09-12-2006, 11:23 PM   #10
Ben Crowson
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yeah- im sure its a unichip.....if you look on unichips website they talk about the injector driver etc.............there company is right down the road from me- I have a gpmoto unichip by the way- they just made it plug and play so you done mess with wiring. I have seen the tuning software and map selection process- my friend works for gpmoto and has reflased it with me there.
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