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Grant Baker

EMAP (Exhaust Back Pressure) Sensor

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Hi,

I know it's been asked before, but can't find it...

Has anybody tried using one of these sort of sensors in a petrol turbo car?

https://www.ebay.com/itm/EBP-Sensor-Exhaust-Back-Pressure-Fits-Ford-Powerstroke-97-03-6-0L-7-3L/183539423102?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D20131003132420%26meid%3Dd260f2dc748b49108b2122a9620e37e5%26pid%3D100005%26rk%3D2%26rkt%3D12%26sd%3D201900602277%26itm%3D183539423102&_trksid=p2047675.c100005.m1851

 

I assume the EGT is going to be too high, but is there a sensor that can screw directly (or nearly directly) into an exhaust manifold to measure EMAP?

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I have never seen one connected directly.  The sensor needs to be protected from the temperature and contamination/condensation.  Usually a length of stainless tube from manifold running "uphill" to a small canister - normally filled with steel wool, then the EMAP sensor is connected to that.

https://racespeconline.com/products/t1-emap-canister

https://turbosource.com/products/full-function-engineering-emap-exhaust-manifold-pressure-canister

https://www.xenocron.com/products/xenocron-emap-backpressure-kit?variant=5071867543589

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I know that some OEMs have EMAP sensors. I have to assume that they are only diesels then with lower EGT?

Certainly never seen a length of tube / canister on a car as OE...

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Weld a brake pipe fitting onto the manifold/collector. Then you can just screw in some brake pipe to dissipate the heat before the sensor, and when done  screw in a nipple to seal it up.

 

Or drill, tap, whatever suits

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Here is an example of mine. Source is EGR port, which may skew the number from actual, but I don't have a way to source off the manifold of turbine housing right now. The far side of the canister will go to a braided line. The braided line will go to a firewall mounted pressure transducer. I suppose the transducer could be screwed directly into the canister.

IMG_1401.JPG

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