Help. Whistle Sound After Intercooler Install

Stinger · Jun 20, 2022

So when at 6-8 pounds of boost and up I get a little whistle sound like letting air out of a balloon slowly. It’s not loud but noticeable. I’m steady on the throttle and boost is building. Should I just tighten clamps? I have HPS clamps and connector hoses on the Ultimate Performance IC. HKS SSQV BOV that was installed a couple months ago. Whistle just started after putting in IC.

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UNBROKEN · Jun 20, 2022

That’s a boost leak.

Stinger · Jun 20, 2022

UNBROKEN said:

I thought boost leak was a loud hissing sound?

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twin001 · Jun 21, 2022

Stinger said:

it would be a louder hissing sound if you were making full boost due to more air coming out of the leak path. Check all of your connections again and make sure the fitting you install on the driver side of the Whipple has thread sealant on it and is properly tightened. Also make sure the air sensor you removed with the 2x T27 torx screws is properly reinstalled.

UNBROKEN · Jun 21, 2022

Rubber boots can whistle.

Stinger · Jun 21, 2022

twin001 said:

I have the ultimate performance IC. The fitting was welded on. I was worried about the sensor the most since it’s so hard to get to. But I made sure it was well seated on install since I didn’t have any gasket maker. Thanks.

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Stinger · Jun 21, 2022

UNBROKEN said:

Thanks Unbroken. It was the boots. I readjusted and tightened the cold side clamp since the Fenfab pipe tapers pretty good. Then I retightened the hot side. Checked the BOV and connections. Tightened the catch can. Noise gone.

What do you estimate my max boost should be on e50? Would the larger IC drop max boost?

TMac · Jun 21, 2022

Intercooler doesn't affect boost seen in the intake, it affects intake air temperature.

Stinger · Jun 21, 2022

TMac said:

Obviously IAT.

I was thinking a side effect of the increased volume in the IC might bring total pressure down. But that doesn’t make much sense. Maybe milliseconds longer to get to peak boost.

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TMac · Jun 21, 2022

Honestly, the question shows you're thinking! But, consider: when you lower temps, you lower pressure. An intercooler definitely lowers the pressure coming from the compressor by removing heat. However the increase in volume lowers velocity and increases pressure (they're inversely proportional) . In the end however, the boost control solenoid is running off the intake, and the control mechanism is on the turbine. Static pressure is higher at compressor discharge and lower at the intake manifold. Temp is higher at compressor discharge and lower at intake manifold. End result is same mass flow per time unit at lower temps which is healthier for the engine.

Stinger · Jun 21, 2022

TMac said:

Honestly, the question shows you're thinking! But, consider: when you lower temps, you lower pressure. An intercooler definitely lowers the pressure coming from the compressor by removing heat. However the increase in volume lowers velocity and increases pressure (they're inversely proportional) . In the end however, the boost control solenoid is running off the intake, and the control mechanism is on the turbine. Static pressure is higher at compressor discharge and lower at the intake manifold. Temp is higher at compressor discharge and lower at intake manifold. End result is same mass flow per time unit at lower temps which is healthier for the engine.

Thanks again for the help and informative answer. Much appreciated.

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Help. Whistle Sound After Intercooler Install

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