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post #1 of 6 Old 01-26-2012, 07:28 PM Thread Starter
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Boost Question

A few months back i got an AFE bladerunner intake manifold. Installed it and took it for a drive. I notice that i get more boost at lower rpms but im peaking out at 15.5 - 16 psi wot. Before i put the manifold on i would get an easy 18. I have taken it apart twice and put it back together thinking i had a leak, but same result. Yeah im getting more air but im guessing it is not as dense going past the sensor. Does this seem right?

99.5 250 afe intake, pyro, boost, trans, 5" turbo back, quadzilla x2
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post #2 of 6 Old 01-26-2012, 11:46 PM
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check for soot around your up pipes first a leak there would cause lower boost.

Sold 2001 f250 ccsb 4x4 400/400, dual terminators, swamps 80mm bfh, headers, bts and all the usual supporting mods. 715hp fuel only.

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post #3 of 6 Old 01-27-2012, 06:12 PM Thread Starter
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Up pipes look good. Mabye because its cold out and the air is thinner? Hasnt been above 50 degrees since i installed it. Supposed to be about 52ish tomorrow, ill give her a run and see how she does in warmer weather.
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post #4 of 6 Old 01-28-2012, 06:22 PM
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Cold air is denser, and 50-52 is relatively warm, and with a chip you should easily see 20+PSI on a WOT run, I can get 24+

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post #5 of 6 Old 01-29-2012, 12:14 AM
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It all depends on what chip your running not all chips let you boost more mad before a velcro and defueling is 23, some don't have enough effect to let you build that even.

Sold 2001 f250 ccsb 4x4 400/400, dual terminators, swamps 80mm bfh, headers, bts and all the usual supporting mods. 715hp fuel only.

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post #6 of 6 Old 01-29-2012, 09:46 AM
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boost is pressure and pressure is a measurement of restriction. with a higher flowing intake you are flowing more CFM. so while you're boost (restriction) will be "less" even though you're still flowing the same amount of air (cfm).

for example, take a supercharged mustang. bone stock engine and the thing pushes 10 pounds and makes say 400hp. put some headers on it, and an open exhaust, throw some ported heads and larger cam. now that same mustang with the same pulleys will probably be making only 7 or 8 pounds of boost yet it's making more power because the engine is running more efficiently and probably making around 500hp......


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