ATI p1-SC
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TECH Fanatic
Joined: Mar 2002
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From: toronto
ATI p1-SC How smooth does the unit run at idle mine tends to make a rattle/high pitched grindee noise but smooths out under boost should i be worried it has 100 miles on it ?
in my 2002 gmc sierra 5.3l short cab sporside
i did i few dyno pulls and got up too 366rwhp
and 364rwtq
what are everyone air fuels running at ?
in my 2002 gmc sierra 5.3l short cab sporside
i did i few dyno pulls and got up too 366rwhp
and 364rwtq
what are everyone air fuels running at ?
Tech Addict
Joined: Dec 2001
Posts: 3,205
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From: Marysville, WA
Re: ATI p1-SC </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by GMC SKI:
<strong>How smooth does the unit run at idle mine tends to make a rattle/high pitched grindee noise but smooths out under boost should i be worried it has 100 miles on it ?
in my 2002 gmc sierra 5.3l short cab sporside
i did i few dyno pulls and got up too 366rwhp
and 364rwtq
what are everyone air fuels running at ?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Mine has the exact same sound. You could not have described it better.
I have around 100-200 mi on mine also. When you get to 900-1000 rpms it is a sweet whinning noise, at dead idle I hear the same noise as you described.
I even loosened my belt thinking it was to tight, same noise. That grinding noise bothers me a little. The blower really sounds sweet though.
My a/f is at 11.5 till 6g then 12.1.
Todd
<strong>How smooth does the unit run at idle mine tends to make a rattle/high pitched grindee noise but smooths out under boost should i be worried it has 100 miles on it ?
in my 2002 gmc sierra 5.3l short cab sporside
i did i few dyno pulls and got up too 366rwhp
and 364rwtq
what are everyone air fuels running at ?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Mine has the exact same sound. You could not have described it better.
I have around 100-200 mi on mine also. When you get to 900-1000 rpms it is a sweet whinning noise, at dead idle I hear the same noise as you described.
I even loosened my belt thinking it was to tight, same noise. That grinding noise bothers me a little. The blower really sounds sweet though.
My a/f is at 11.5 till 6g then 12.1.
Todd
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Posts: 3,048
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From: Raleigh, NC
Re: ATI p1-SC </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by MA WS6:
<strong>They all do it at idle. ATI says that it is gear lash and is normal.It's to bad, as it sounds like a bad power steering pump at idle.
John</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Ha... that's the way a mechanic described mine when I had the 4.10" Pulley, and I agreed. Most people said it sounded like a jet when i ran it, though. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Funny... the smaller pulley makes it sound more like a whine/whistle sound rather than the sound we've just described here.
<strong>They all do it at idle. ATI says that it is gear lash and is normal.It's to bad, as it sounds like a bad power steering pump at idle.
John</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Ha... that's the way a mechanic described mine when I had the 4.10" Pulley, and I agreed. Most people said it sounded like a jet when i ran it, though. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Funny... the smaller pulley makes it sound more like a whine/whistle sound rather than the sound we've just described here.
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From: Marysville, WA
Re: ATI p1-SC As long as everyone has the same sound, I think we are fine. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
I can see the thought behind the smaller pulley eliminating that sound. When I just touch the gas it's gone.
I really like the whinning sound of the supercharger, I can't believe folks want that sound to be quiet. It's awesome!
Todd
I can see the thought behind the smaller pulley eliminating that sound. When I just touch the gas it's gone.
I really like the whinning sound of the supercharger, I can't believe folks want that sound to be quiet. It's awesome!
Todd
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From: Centrifugal City
Re: ATI p1-SC So with a smaller 3.40 or 3.20 pulley and a higher idle around 900rpm, the clashing/rattling gears shouldn't be as bad?
You could bump up the idle with the bigger pulleys then. Like people do to smooth out cams, eh?
You could bump up the idle with the bigger pulleys then. Like people do to smooth out cams, eh?
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Verdad Gallardo Moderator
Joined: Nov 2001
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From: Raleigh, NC
Re: ATI p1-SC Definitely... the smaller pulley got rid of the rattly, bearing noise. It went to a more whistly, slightly screeching noise.
It really DOES remind you of the batmobile screaming by. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Try to check out the video I posted if you can download the .MPG file, you will hear what I mean.
http://www.mlbuie.com/BlackLS1TA/wav...-40_120-23.mpg
<small>[ May 06, 2002, 03:18 PM: Message edited by: Black LS1 T/A ]</small>
It really DOES remind you of the batmobile screaming by. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Try to check out the video I posted if you can download the .MPG file, you will hear what I mean.
http://www.mlbuie.com/BlackLS1TA/wav...-40_120-23.mpg
<small>[ May 06, 2002, 03:18 PM: Message edited by: Black LS1 T/A ]</small>
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Joined: Nov 2001
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From: Woodlyn, PA
Re: ATI p1-SC </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Black LS1 T/A:
<strong>Definitely... the smaller pulley got rid of the rattly, bearing noise. It went to a more whistly, slightly screeching noise.
It really DOES remind you of the batmobile screaming by. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Try to check out the video I posted if you can download the .MPG file, you will hear what I mean.
http://www.mlbuie.com/BlackLS1TA/wav...-40_120-23.mpg</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Of course.. the blower is spinning faster. The internals don't have a chance to rattle as the load of spinning faster keeps them quiet.
That is why the noise goes away.
Though excessive knocking can be the crank pulley loosening up.
<strong>Definitely... the smaller pulley got rid of the rattly, bearing noise. It went to a more whistly, slightly screeching noise.
It really DOES remind you of the batmobile screaming by. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Try to check out the video I posted if you can download the .MPG file, you will hear what I mean.
http://www.mlbuie.com/BlackLS1TA/wav...-40_120-23.mpg</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Of course.. the blower is spinning faster. The internals don't have a chance to rattle as the load of spinning faster keeps them quiet.
That is why the noise goes away.
Though excessive knocking can be the crank pulley loosening up.
