Pressure sensors - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 2 Old 03-16-2014, 07:22 AM Thread Starter
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Pressure sensors

I am purchasing up parts for my Holley Dominator EFI and need to think about a MAP sensor, Dome pressure sensor, Crankcase pressure sensor, Exhaust pressure sensors (pre & post turbo).

For a MAP, I already have an AEM 3.5bar that I am happy with 3.5 BAR / 50 PSIa MAP Stainless Steel Sensor Kit . It requires me to input the scaling manually into the Holley system whereas buying the Holley Performance Products 5 Bar MAPĀ#554-108 , it is already there as an option. My question is, since I am not going to be seeing 30# of boost will I be better off with the 3.5bar? My thinking is yes based on finer scaling voltage to vac/boost. Am I right in that thinking?

For Dome, I figure repeat the MAP sensor at the W/G dome as well. And right now, I am leaning towards the AEM which means buy another. Still cheaper than buying TWO new ones.

How much exhaust pressure should I be seeing pre and post turbo? That will be my starting point for their sensors. I am looking at a cheaper sensor here though and would be fine with the brass style that AEM uses such as this 100 PSIg Brass Sensor Kit Am I right in my thinking that I will ALWAYS see pressure here so no need to worry about it reading vac?

For the crankcase, I am more interested in vac but positive pressure is just as important to me. I am going to use it's reading to trigger my electric vacuum pump through the Dominator ECU and via relay. But it will also be there to read how much vacuum that pump is actually pulling on my crankcase. Not enough and I will rethink the pump. Here is what I am thinking for the sensor 1 BAR / 15 PSIg Brass Sensor Kit I figure anything in the crankcase outside of 1bar is an issue anyways.

The nice thing about the AEM stuff, is that their scaling is available right on their product's webpage. However, their brass sensors seem to be twice the price they should be for what they are. I am finding similar (looking) senders on ebay for around $30 and AEM wants $60+ per.


Dart 348ci, Ed Curtis cam/valvetrain, Precision 76mm, Holley Dominator EFI, CNP ignition, tons of Holler EFI small parts, 4"dp, 4R70W w/T-brake, new suspension coming soon.

Little 750rwhp at 6,000rpms and only 10lbs of boost before we just got tired of playing with clutches. New 4R70W and we are turning it up. Expecting 1,000rwhp.

Last edited by kbscobravert; 03-16-2014 at 07:33 AM.
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post #2 of 2 Old 03-16-2014, 10:44 AM Thread Starter
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I may have a simpler solution for some of these.

I am replacing all my AEM digital gauges that I upgraded to the SS sensors a few years back. That has left me with two of these 100 PSIg Stainless Steel Sensor Kit and then the two original brass senders from their kits, 100 PSIg Brass Sensor Kit . And then I have AEM 5bar MAP from the boost gauge upgrade which is this sender 5 BAR / 75 PSIa MAP Stainless Steel Sensor Kit

So all I need to buy is a 2bar for the crankcase

I can use the 100 PSIg Stainless Steel Sensor Kit for exhaust pressure as long as it is isolated on a 24" stainless hose which is connected to the exhaust port by 18" stainless tubing. If you look at this AEM kit, that is virtually what they have done Exhaust Back Pressure Install Kit - 4 Channel Wideband it is the same sensor.

Dome pressure can use 5 BAR / 75 PSIa MAP Stainless Steel Sensor Kit

I am going to stick with the AEM 3.5bar I have for MAP.

That all saves me several hundred dollars that if I sold the parts with the gauges, I would not have recouped to buy other sensors I am sure. Therefore repurposed!


Dart 348ci, Ed Curtis cam/valvetrain, Precision 76mm, Holley Dominator EFI, CNP ignition, tons of Holler EFI small parts, 4"dp, 4R70W w/T-brake, new suspension coming soon.

Little 750rwhp at 6,000rpms and only 10lbs of boost before we just got tired of playing with clutches. New 4R70W and we are turning it up. Expecting 1,000rwhp.
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