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Upgrades and Aftermarket - 99 & up 7.3L Engine Upgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 04-07-2006, 08:40 PM   #1 (permalink)
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Boost pressure relief valve

Was speaking with a buddy of mine about putting a boost pressure relief value on my truck - a valve to stop the the truck from throwing codes if boost pressure gets to high. He was saying that with his truck (a d-max) the valve wasn't necessary as he can turn this 'feature' off with a programmer. I'm wondering if anyone knows if it's possible to do this on a 7.3, or if it's purely mechanical and cannot be turned off with programming.
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Old 04-07-2006, 08:43 PM   #2 (permalink)
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Re: Boost pressure relief valve

To my knowledge, it can't be turned off with programming. The MAP sensor takes a mechanical reading and sends the data to the PCM, I think the only way to disable defueling would be to disable the MAP sensor. There are some 'electronic' plug-ins that keep the MAP sensor from throwing the code, and supposedly work well.
It just make sense to me though, to never let the MAP sensor see excess boost.
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Old 04-07-2006, 09:24 PM   #3 (permalink)
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Re: Boost pressure relief valve

an Overboost eliminator from us will cure that issue and your install will take about 10 seconds.
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Old 04-08-2006, 01:00 AM   #4 (permalink)
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Re: Boost pressure relief valve

I am using it and it works perfect. Easy install, clean setup.
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Old 04-08-2006, 05:13 AM   #5 (permalink)
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Re: Boost pressure relief valve

Here are 2 different in-line relief valves.

http://www.itpdiesel.com/store.php?c...on=show_detail

http://www.dieselsite.com/index.asp?...&ProdID=31

Im looking toward the BRV+ as you can use this to connect your Boost gauge to one side of the valve.

I assume you already have gauges - this just goes in the line where you are tapping for the sensing anyway. Consider the relief valve as if you ever want to change programs you wont have to worry about whether you can get the parameter in the tune/program.
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Old 04-08-2006, 09:59 AM   #6 (permalink)
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Re: Boost pressure relief valve

I just bought a small air preasure regulator off of ebay I think it was $6.00 delivered and it does the same thing. I guess I'm cheap [img]/ubbthreads/images/graemlins/phoney.gif[/img]
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Old 04-11-2006, 09:31 PM   #7 (permalink)
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Re: Boost pressure relief valve

Thanks for the responses guys. I'm wondering if I would need to do the mod at all. Don't get me wrong, I've got no problem spending 50 bucks, or whatever, and doing the relatively easy install.

My question is related to the PCM and custom tunes. A buddy of mine has a newer d-max and a custom tuner (I guess 'sniper'is a similar product in the ford market). In his world, he simply lets the sensor tell the PCM (chevy calls it an ECM I'm told) that boost is too high, and he tells his EMC to ignore the sensor. It free, assuming you've paid for the programmer, and no cutting on the truck.

I'm wondering if the PCM on my truck is capable of ignoring the sensor, and if so, do any of the tuners on the market tell the PCM to do so? If I had a newer 6.0, I would expect to be able to ignore the sensor, but I'm not sure what to expect from the computer on the 7.3.
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Old 04-11-2006, 10:35 PM   #8 (permalink)
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Re: Boost pressure relief valve

[ QUOTE ]
Thanks for the responses guys. I'm wondering if I would need to do the mod at all. Don't get me wrong, I've got no problem spending 50 bucks, or whatever, and doing the relatively easy install.

My question is related to the PCM and custom tunes. A buddy of mine has a newer d-max and a custom tuner (I guess 'sniper'is a similar product in the ford market). In his world, he simply lets the sensor tell the PCM (chevy calls it an ECM I'm told) that boost is too high, and he tells his EMC to ignore the sensor. It free, assuming you've paid for the programmer, and no cutting on the truck.

I'm wondering if the PCM on my truck is capable of ignoring the sensor, and if so, do any of the tuners on the market tell the PCM to do so? If I had a newer 6.0, I would expect to be able to ignore the sensor, but I'm not sure what to expect from the computer on the 7.3.

[/ QUOTE ]

The answer is NO. Read above for the solution.
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