Turbo blow back? - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 07-16-2010, 03:31 PM Thread Starter
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Turbo blow back?

I built my custom intake and now I'm hearing a definite hiss under load. If I turn off the overdive and the RPMs go up it goes away. I'm thinking its excess turbo pressure blowing back thru the new intake. But I'm wondering if it could be the wastegate opening early. Not sure if you could hear the wastegate. It's an early '99 so it has the wicked wheel stock. I'm in the process of building my own adjustable wastegate arm (similar to the turbomaster).

(3/98 prod date) with Edge Evolution, MBRP 4" turbo back, Autometer gauges, custom DIY cold air intake, FPR mod, A/C mod, custom built adjustable waste controller, DIY Alpine head unit, navigation, surround sound processor, JL Audio amps and speakers, 15" over head rear monitor and Sony PS2 (for kids), custom behind rear seat sub enclosure with two 10's
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post #2 of 5 Old 07-16-2010, 06:17 PM
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Well the intake will let you hear the turbo more, is it not just that?


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post #3 of 5 Old 07-16-2010, 06:36 PM
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I wondered the same thing with my truck....it is just the new intake that lets you hear everything more. Nothing to worry about. Everyone says you wont be able to hear the wastegate. If it was the waste gate you would loose boost pressure up high.

2011 F-250 6.7L FX4 Lariat CCSB Tuxedo Black, Black Leather, 6" Lift w/ 37" Nitto trail grapplers 20" XD rims.
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post #4 of 5 Old 07-17-2010, 12:30 AM Thread Starter
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I know the wastegate is opening early. I have a secondary spring to help but im still only seeing about 22psi. Disconnecting the red wastegate line the pressure goes up to 25psi.

(3/98 prod date) with Edge Evolution, MBRP 4" turbo back, Autometer gauges, custom DIY cold air intake, FPR mod, A/C mod, custom built adjustable waste controller, DIY Alpine head unit, navigation, surround sound processor, JL Audio amps and speakers, 15" over head rear monitor and Sony PS2 (for kids), custom behind rear seat sub enclosure with two 10's
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post #5 of 5 Old 07-17-2010, 07:01 AM
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That is normal boost pressure for a truck like yours.

2011 F-250 6.7L FX4 Lariat CCSB Tuxedo Black, Black Leather, 6" Lift w/ 37" Nitto trail grapplers 20" XD rims.
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