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Old 03-06-2012, 08:30 PM
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Big Boost?

I've watched video's on youtube at powerstrokehelp.com they guy on there says something about a map sensor fooler or boost fooler called big boost its on ebay for $75 does anyone have one and if so how is it???
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Old 03-06-2012, 08:37 PM
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Subscribed... I'm curious about this
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Old 03-06-2012, 08:40 PM
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Without getting into opinions on the website mentioned....I have one (not the Ebay one, but same thing). Early on there weren't any "no code" tunes and depending on the truck, usually between 23-27psi the PCM will tell the engine to start cutting fuel (defueling) to limit boost levels and sets the check engine light for a few minutes. If your truck is making boost levels up in that range then it can be worth it. I have one on my truck. All it does is bleed off any extra pressure over whatever it is set at so the MAP sensor thinks it's under factory set boost levels and it keeps the truck from defueling. I run 28-30 psi right now and the boost fooler has been working great for a few years now.

One other option is I know that some tuners these days are making "No code" tunes and it pretty much eliminates the need for the boost fooler.

Oh yeah, one more thing...You can probably make one for cheaper than that. Mine is just a air regulator (like one off of a shop compressed air tank) and a few feet of line to connect it. Just make a few runs and set the regulator and you should be good to go!

-Aaron
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Old 03-06-2012, 10:09 PM
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The PCM will start defueling at around 21PSI. But on stock tuning/truck, you can only make about 18PSI. So the only time you would need to fool your PCM is if you have extras, like a big turbo, or tunes. Heres the thing. You can fool the PCM in the tuning. So really, a boost fooler is not needed.
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Old 03-07-2012, 12:37 AM
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The boost defueling is based off of absolute pressure (MAP sensor) and your gauge reads differential pressure so the exact psi (that you see on the gauge) that it will defuel depends on atmospheric pressure. I've never seen one that defuels at 21 psi, but it's possible. Usually get at least 23 psi, mine would get to about 26-27psi before defueling. I know I'm kind of splitting hairs here and not trying to be a jerk about it, but wanted the OP to know that just because it doesn't defuel at 21 doesn't necessarily mean it's broke or modified.
-Aaron
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Old 03-07-2012, 01:11 PM
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i have a 2002 f250 i have installed a s&b cold air kit, a 4" mbrb exhaust and recently a edge evloution cs. the most boost ive seen was around 21 im just wanting to know if the big boost is worth the $ for what it does?? thanks for all the info guys!
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Old 03-08-2012, 07:59 PM
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i have an e99 and i get about 27-28 psi and my checkk engine like comes on for a while.. does that mean its defueling? and if i were to get the boost fooler will i get more power because it stops the defueling?
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Old 03-08-2012, 08:15 PM
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Yeah its probably defuling, and the light is the code for too much boost.
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Old 03-08-2012, 08:22 PM
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Have to check the code to be sure...but it sounds like that is the case.
-Aaron
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