UDP installed: New Noises
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Joined: Jan 2001
Posts: 152
I had my new Unorthodox Racing Underdrive Pulley installed this past weekend. I do have a new noise that I am wondering about though.
With the A/C on (and to a lesser degree, any electrical items such as lights or radio) I have what sounds like a little high pitched rattle like a belt might be loose. The belts seem pretty snug though to look at them. I can press them in less than 1/8 inch if I had to guess at at. That high pitched noise goes away with moderate acceleration which still seems to point back to belts.
Anyone else installed the pulley and have a similiar new noise.
BTW: Dyno says that my car is putting 160Hp to the ground now. Automatic transmission with PRI/CAI and UR/UDP. No exhaust yet. Power drops off after 5300RPM. Exhaust mods should level that graph out a little.
With the A/C on (and to a lesser degree, any electrical items such as lights or radio) I have what sounds like a little high pitched rattle like a belt might be loose. The belts seem pretty snug though to look at them. I can press them in less than 1/8 inch if I had to guess at at. That high pitched noise goes away with moderate acceleration which still seems to point back to belts.
Anyone else installed the pulley and have a similiar new noise.
BTW: Dyno says that my car is putting 160Hp to the ground now. Automatic transmission with PRI/CAI and UR/UDP. No exhaust yet. Power drops off after 5300RPM. Exhaust mods should level that graph out a little.
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Joined: Jan 2001
Posts: 1,277
Usually too loose a belt will squeal. It could be that the belts are too tight and that you are hearing the bearings or bushings.
Another possibility is the idler pulley. IIRC, the bolt in the center of the pulley needs to be loosened before it can be adjusted. The mechanic may have forgotten to tighten it when he was done.
Daniel Martin has a great technique for isolating and identifying engine noises. He recommends a 4' length of vacuum line. Place one end up to your ear and use the other on different parts of the engine. Obviously, be careful around rotating equipment.
Another possibility is the idler pulley. IIRC, the bolt in the center of the pulley needs to be loosened before it can be adjusted. The mechanic may have forgotten to tighten it when he was done.
Daniel Martin has a great technique for isolating and identifying engine noises. He recommends a 4' length of vacuum line. Place one end up to your ear and use the other on different parts of the engine. Obviously, be careful around rotating equipment.
Thread Starter
Senior Member
Joined: Jan 2001
Posts: 152
Originally posted by sinewave
Usually too loose a belt will squeal. It could be that the belts are too tight and that you are hearing the bearings or bushings.
Another possibility is the idler pulley. IIRC, the bolt in the center of the pulley needs to be loosened before it can be adjusted. The mechanic may have forgotten to tighten it when he was done.
Daniel Martin has a great technique for isolating and identifying engine noises. He recommends a 4' length of vacuum line. Place one end up to your ear and use the other on different parts of the engine. Obviously, be careful around rotating equipment.
Usually too loose a belt will squeal. It could be that the belts are too tight and that you are hearing the bearings or bushings.
Another possibility is the idler pulley. IIRC, the bolt in the center of the pulley needs to be loosened before it can be adjusted. The mechanic may have forgotten to tighten it when he was done.
Daniel Martin has a great technique for isolating and identifying engine noises. He recommends a 4' length of vacuum line. Place one end up to your ear and use the other on different parts of the engine. Obviously, be careful around rotating equipment.
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