Engine Grinding Noise at 3500 RPM - LotusTalk - The Lotus Cars Community
 
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post #1 of 8 (permalink) Old 04-12-2010, 09:22 PM Thread Starter
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Looking for a new exhaust. (Previous: Engine Grinding Noise at 3500 RPM)

I have a 2005 Lotus Elise standard US version.
It has 9,000 miles on it, and mostly track driving.
Yesterday I noticed a grinding sound when driving around 3500 to 4000 rpm on the hwy. After I got home, I put the car in NEUTRAL, and pressed on the throttle up to 3500 rpm to see if the noise was still there, and it indeed was.
The noise sounds metallic, and it does not go away even when the car is cooled. The tachometer does reflect any jumping in rev speed however.
What could be the problem?

Last edited by ieehat; 04-16-2010 at 09:12 PM.
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post #2 of 8 (permalink) Old 04-12-2010, 09:54 PM
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i dont think i can help but i believe for the other amazing techies here a sound clip/video might help close in your investigation

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post #3 of 8 (permalink) Old 04-13-2010, 03:24 AM
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Could be many things. Spun bearing?

My car is modified.
www.lotussport.org
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post #4 of 8 (permalink) Old 04-13-2010, 04:22 AM
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with out a sound clip i would say the first thing to check, and the easiest would be to check the cams for wear. any check engine light or stored codes? remember just because the light isnt on doesnt mean there arent codes pending.

spun bearing is possible, but that is usually heard through the entire RPM range.

good luck,
T.J.
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post #5 of 8 (permalink) Old 04-14-2010, 01:46 PM Thread Starter
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Ok, so I investigated further, and the sound is actually coming from the Y collector of the exhaust. I have the stock exhaust, does that mean I should be looking for a new Y pipe?
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post #6 of 8 (permalink) Old 04-14-2010, 02:16 PM
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Bet that's a relief-

Are you referring to the exhaust manifold? ...or the pipe that connects the exhaust manifold to the muffler? If the latter, it may be your catalytic converter, or you might check your O2 sensors-

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post #7 of 8 (permalink) Old 04-16-2010, 09:11 PM Thread Starter
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Thanks, yeah that was a relief. My mechanic took it apart, and it turned out to be a piece of metal in the muffler. He recommends me to replace the exhaust as well. Anybody know a good racing exhaust? Or are they pretty much all the same?
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post #8 of 8 (permalink) Old 04-17-2010, 05:05 AM
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It's really a matter of personal preference (not performance)- You can probably find a stock replacment for free (or close to it) on this forum-

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