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Trying to tune a 351W in a 91 lx 5.0 car. When I get the idle down to a reasonable rpm the TB starts to whistle. Cannot detect any vacuum leaks. I think its the fast air speed by the butterfly and the tb housing. Do I drill the butterfly, or would a idle control spacer help me ?
 

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Whistle

I have a Ford motorsport 65mm TB and when I punch the gas it makes a wistle sucking noise. It is just the air being sucked in. I think it sounds kinds cool!
 

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My 70mm Mac TB whistles too. I have a buddy whose does the same thing. No problem that I'm aware of.
 

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I too have a whistle. At idle and during acceleration. I assume its the BBK TB.
 

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mine does a swoosh when i stomp it hard. it sounds sweet :D

i hear some people take and drill a 5/16 or 3/16 hole in theirs to help with idle problems....but i haven't had to, and i have a BBK 70MM.... (just cleaned it yesterday, still working great)
 

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i got one too,at about 2 grand,and a 1/8" hole in a bbk 75.not to bad
 

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THROTTLE BODY WHISTLE...

BBK AND MAC TB HAV AN ANGLE CUT HOLE WHERE THE AIR FROM IDLE BYPASS SOLENOID ATTATCHES. THE AIR MOVING ACROSS THAT ANGLED HOLE WHISTLES. A SIMPLE FIX IS THE SANDWICH IDLE PLATE FROM FORD. THIS WILL CORRECT THE WHISTLE. GOOD LUCK, JASON
 

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anyone have an idle air bypass plate on? I had one and it made the same noise. when I took it off the noise was gone
 

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Just put on a FMS 65mm TB and got the whistle. Thought these were the ones that weren't suppose to whistle. Does it while driving vice parked (under load). Any ideas? Oh yeah, I get a hella "swooop" sound too from the Denscharger:D The CAI didn't whistle with the OEM TB so I doubt that's the problem.
 
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