Controling fuel pump with inj1 output

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krisr
Master MS/Extra'er
Posts: 799
Joined: Wed Aug 17, 2005 1:17 am
Location: Sydney, Australia

Re: Controling fuel pump with inj1 output

Post by krisr »

You might be able to use a solid state relay and use PWM to control a secondary pump. I'd just make sure you have valves on the outlets of each pump so your secondary pump doesn't try feed back into the primary pump and cause it to cavitate. I've personally wanted to look at using one for an electric water pump by stripping the thermostat out and pulsing the pump at 20% when cold and ramp it up with temp.

A couple of tuning shops over this way use SSR's when you only have low current outputs left over and want to say run PWM for water pumps, fuel pumps or run say 8 secondary injectors etc.... Running a secondary fuel pump with PWM, as mentioned above you'd need a fuel pressure sensor and run the secondary pump with a PID, or you may be able to just switch the pump on above a certain RPM and do some funky work in your VE table above the switchpoint where the second pump kicks in?
Sydney, Australia
1971 Holden Monaro HQ
MS3X Sequentially fuelled 400 Pontiac
bojane-1
Experienced MS/Extra'er
Posts: 158
Joined: Sun Jun 13, 2010 1:40 pm

Re: Controling fuel pump with inj1 output

Post by bojane-1 »

krisr:

Do you have any specific ssr that I can use to pwm the fuelpump ?
krisr
Master MS/Extra'er
Posts: 799
Joined: Wed Aug 17, 2005 1:17 am
Location: Sydney, Australia

Re: Controling fuel pump with inj1 output

Post by krisr »

These are the SSR's that blokes out here use and if my electric water pump idea gets off the ground,what i'll be using to pulse it.

The SSR;
http://www.jaycar.com.au/productView.asp?ID=SY4086

Datasheet;
http://us1.webpublications.com.au/stati ... S33_en.pdf

Autospeed article on their usage too - it may help;
http://autospeed.com.au/cms/title_Using ... ticle.html
Sydney, Australia
1971 Holden Monaro HQ
MS3X Sequentially fuelled 400 Pontiac
Dookie454
Experienced MS/Extra'er
Posts: 344
Joined: Mon Jul 25, 2011 9:18 pm

Re: Controling fuel pump with inj1 output

Post by Dookie454 »

Can the SSR listed below be switched/PWM from the ground wire? The wiring diagrams show the switching occuring on the 12v side.

If so I might get one of these to drive my 35Amp startup/25amp full load Cooling Fan since 7amp draw at 50% PMW is proving to generate too much heat inside the MS3 and less than half of the fans potential.
MS3X on 2010 Camaro LS3 + Whipple @ 10psi + HPT + AEM 30-0333/0334 WB
MS3 Knock Module + JBPerf Dual VR v2.1 (Removed), didnt play well with LS3 DBW Motor, works for VSS.
OLD: 1997 Chevy Z71 Vortec 350, + BOSCH 0261231036 WB Knock Sensor
OLD: LT1 TA 700hp + MS3X
krisr
Master MS/Extra'er
Posts: 799
Joined: Wed Aug 17, 2005 1:17 am
Location: Sydney, Australia

Re: Controling fuel pump with inj1 output

Post by krisr »

I found this wiring diagram for SSR's and how to wire them up to a Haltech. Pullup resister is to ensure that the device is not ever switched on when the engine is not running i'm told. Am tempted to give it a go with my cooling fans soon.

http://www.haltech.com/wp-content/uploa ... 030202.pdf
Sydney, Australia
1971 Holden Monaro HQ
MS3X Sequentially fuelled 400 Pontiac
Dookie454
Experienced MS/Extra'er
Posts: 344
Joined: Mon Jul 25, 2011 9:18 pm

Re: Controling fuel pump with inj1 output

Post by Dookie454 »

nice find. I bought one on ebay looks very similar to it. Its a 40amp. Its coming from China, prob be a week or two before it shows up. I'll give it a shot. http://www.ebay.com/itm/250672011513
MS3X on 2010 Camaro LS3 + Whipple @ 10psi + HPT + AEM 30-0333/0334 WB
MS3 Knock Module + JBPerf Dual VR v2.1 (Removed), didnt play well with LS3 DBW Motor, works for VSS.
OLD: 1997 Chevy Z71 Vortec 350, + BOSCH 0261231036 WB Knock Sensor
OLD: LT1 TA 700hp + MS3X
bojane-1
Experienced MS/Extra'er
Posts: 158
Joined: Sun Jun 13, 2010 1:40 pm

Re: Controling fuel pump with inj1 output

Post by bojane-1 »

Dookie454: How did the relay work out for you ?

/Anders
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