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My supercharger suddenly started sounding like a firetruck

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My supercharger suddenly started sounding like a firetruck

 
Old 09-20-2014, 06:49 AM
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Default My supercharger suddenly started sounding like a firetruck

I was cruising ~ 50mph yesterday on my way back from picking up some chinese food and I started to looking around because I thought I heard a firetruck somewhere. After turning the radio down and declutching, I realized it was coming from my car :( I bought a used old JSRC kit (sebring one) and have put a good 4-5k miles on it in past couple months. It never got louder until suddenly yesterday. It still makes boost, but its just makes terrible noises. It is intercoolered with 2 throttles and the pre supercharger throttle is still functioning properly.

Setup -
96 miata
Old jsrc kit (sebring) - I changed the oil when I installed
TDR tensioner and overlay pulley
1mm smaller nose pulley
air to air ic with two throttles
makes ~7.5-8psi
megasquirt

Has my sc bit the dust?
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Old 09-20-2014, 07:09 AM
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Check the bypass is operating properly.
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Old 09-20-2014, 09:40 AM
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Pull the belt and rotate the pulley by hand. You should not feel anything at all. May be a bearing(s) gone.

Had you ever checked the oil?
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Old 09-21-2014, 09:16 AM
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It is the bypass valve. It doesnt work anymore :( I guess the diaphragm in there finally gave up the ghost.
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Old 09-22-2014, 05:50 AM
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Are options for cheaper replacements other than mossmiata.com for $90?
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Old 09-23-2014, 11:08 PM
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Yes, TrackDogRacing.com at about 2/3rd the price.
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Old 12-08-2014, 10:21 AM
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I have a used one. 35.00 shipped
For a m45
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