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Old 07-18-2019, 08:56 PM   #1
streetdoc
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Default holley dominator EFI pressure switches

In the middle of a twin-turbo build and was wondering if anyone had a number of pressure transducers you would need. I'm building a twin-turbo with dual regulators for fuel pressure. I also need them for boost pressure and backpressure. Do i need them on both wastegates? I already have 5 bar map sensor IAT, throttle position sensor. I hope i have not left anything out.
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Old 07-18-2019, 09:30 PM   #2
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MAP, fuel, fuel oump head pressure, oil, dome (one), coolant, exhaust backpressure, transmission (one or two). I do not see why you need more than one for dome or back pressure.
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Old 07-18-2019, 09:36 PM   #3
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Default Re: holley dominator EFI pressure switches

I guess im thinking with two turbos you are monitoring each turbo independently.
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Old 07-18-2019, 09:39 PM   #4
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Default Re: holley dominator EFI pressure switches

was thinking backpressure for individual turbos.
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Old 07-19-2019, 06:58 AM   #5
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Default Re: holley dominator EFI pressure switches

at this price you could buy 20 of them .

https://www.ebay.com/itm/Pressure-tr...FUgI6K&vxp=mtr
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Old 07-19-2019, 01:15 PM   #6
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Default Re: holley dominator EFI pressure switches

Map is fine for boost
I ran a single BP sensor when I had twins. That's good enough if things are working properly, but if there is a problem it might be useful to have one on both banks.
I run a single Dome pressure since my WG dome lines are teed together and the ecu just needs one sensor to modulate dome pressure.
Other sensors you may want/need. Oil pres, fuel pres, trans pres, cooling system pres, oil temp, trans temp, water temp, egts, DS speed sensor.

The dominator has plenty of inputs, so have at it
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Old 07-19-2019, 06:20 PM   #7
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Default Re: holley dominator EFI pressure switches

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Originally Posted by boostedbowtie View Post
at this price you could buy 20 of them .

https://www.ebay.com/itm/Pressure-tr...FUgI6K&vxp=mtr
I would be afraid of them leaking, not knowing their quality. They could be just fine. But it has fuel or oil in it and comes apart, ugg....................
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Old 07-19-2019, 06:58 PM   #8
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Default Re: holley dominator EFI pressure switches

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Originally Posted by streetdoc View Post
In the middle of a twin-turbo build and was wondering if anyone had a number of pressure transducers you would need. I'm building a twin-turbo with dual regulators for fuel pressure. I also need them for boost pressure and backpressure. Do i need them on both wastegates? I already have 5 bar map sensor IAT, throttle position sensor. I hope i have not left anything out.
Needs and wants are 2 different things.

Sure it would be nice to monitor everything....if the ecu even has the ability. But in practical, cost terms etc...need and want will differ.

Why dual regs for fuel ? Or is this some attempt at 2 standalone fuel systems ?

MAP is effectively boost pressure, unless you need multiple monitoring points to determine pressure loss in the system etc

Pre-turbine pressure....both would be nice...really necessary ? probably not. Turbo speed for both however would be very useful.

Cooling system pressure, useful, wastegate position may be more useful than gate pressure. Although if using pressure in the gate as a control parameter, then it may be handy to know both to ensure they are working evenly. But some of that would depend on plumbing etc too.
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Old 07-21-2019, 02:53 AM   #9
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Default Re: holley dominator EFI pressure switches

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Originally Posted by Mike Beck View Post
I would be afraid of them leaking, not knowing their quality. They could be just fine. But it has fuel or oil in it and comes apart, ugg....................
The internal electronic components will fail long before they leak. It is good to know how to check the calibration just to verify accuracy. You can check using compressed air, an air pressure regulator, a mechanical gauge and the ECU itself. Just takes a little thinking, and some fittings.
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Old 07-21-2019, 09:47 AM   #10
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Default Re: holley dominator EFI pressure switches

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You can check using compressed air, an air pressure regulator, a mechanical gauge and the ECU itself. Just takes a little thinking, and some fittings.
I like using a hand pump . I have one of those things you get at the theme parks to spray water on hot days . Works great .

Also a cheap sprayer from home depot also works .

Compressed air can just be a pain sometimes .
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Old 07-23-2019, 01:47 PM   #11
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Default Re: holley dominator EFI pressure switches

Thanks all that have posted. The input helps.
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Old 08-13-2019, 11:20 AM   #12
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Default Re: holley dominator EFI pressure switches

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Originally Posted by streetdoc View Post
Thanks all that have posted. The input helps.
im new here and curious to see what the twin turbo ended up looking like. do you have any pics?
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Old 08-13-2019, 11:36 AM   #13
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Default Re: holley dominator EFI pressure switches

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Originally Posted by boostedbowtie View Post
at this price you could buy 20 of them .

https://www.ebay.com/itm/Pressure-tr...FUgI6K&vxp=mtr
The autex 100psi transducer is deadnuts scaled with holleys 100psi sensor. I run 3 of the autex on my dragboat. Fuel psi hasnt leaked, been thru a rough boating season so far. The autex are 15 each shipped on ebay
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