2001CamaroGuy

iTrader: (6)

I got my new BBK 80 mm TB yesterday and installed it. The car seems to have REALLY picked up some power <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> . It pulls HARD all the way up to 6600 RPM (that’s where my rev lim is....never hit it before....) before I realize it <img border="0" alt="[devil]" title="" src="graemlins/gr_devil.gif" /> .

Here is my only problem: <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" />

At between 20% and 30% throttle and at idle, I get a whistle sound. Above idle (and below 20 %) the sound is gone, and above 30% the sound is gone.

My thoughts: <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

I am thinking it is the round hole for the ICS whistling. I have already checked the seal between the TB and the intake (was tight).

Help???

Any idea what that could be and how I could get rid of it? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

Thanks,

Chris

jimmyblue

iTrader: (11)

If it's the round hole, then you could try
chamfering the edges with an oversize drill
bit. Just break the sharp on the hole by
twisting the bit with your fingers.

jimmyblue

iTrader: (11)

Don't see why the hole would have anything
to do with noise at 30% throttle though.

2001CamaroGuy

iTrader: (6)

Someone on the corvette site said it is the lip that is at the intake/throttle body surface. The intake is a little bit smaller than 80mm....78mm perhaps....and at 20% throttle, the air is hitting that lip and whistling. How would I go about getting rid of that little lip?

WILWAXU

iTrader: (6)

That's a well know problem with those TB's. I would contact BBK. See if they have a suggestion.

TravWS6

Ok does this whistling affect performance? form what it looks like it doesn't? so r u just tryin to get rid of the sound? or is it bad flow or some defect?

2001CamaroGuy

iTrader: (6)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by TravWS6:
<strong>Ok does this whistling affect performance? form what it looks like it doesn't? so r u just tryin to get rid of the sound? or is it bad flow or some defect?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Logic says that any turbulance is going to affect HP some. How much would require a before and after on a dyno.

For me it is the sound. Today I used some 120 grit sand paper and rounded the face of the intake (where the TB mounts). This seems to have cut the sound in half.

SStrokerAce

iTrader: (2)

almost all ported or aftermarket throttle bodies will whistle. That's part of the compromise you have to take to get more HP over stock. The factory has to make it quiet so people don't complain about the whistle.

2001CamaroGuy

iTrader: (6)

is the sound just a result of increased air flow or is in from turbulance that could be avoided some how (do work on the intake)?