3300 rpm off throttle buzz/rattle. - LotusTalk - The Lotus Cars Community
 
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post #1 of 17 (permalink) Old 07-01-2013, 06:47 AM Thread Starter
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3300 rpm off throttle buzz/rattle.

I know others have written of the noise the Elise makes when off the throttle and the engine is in the 3300 rpm range. My car makes the noise when I'm coasting down and the rpms hit that magic zone and I can stop or change the noise by wiggling the shifter.

I recall seeing a thread a long time back where someone fixed the issue by adding a small weight to the shift linkage on the trans to damp the vibration. I've searched for that thread with no luck.

Anyone know the thread I'm thinking of? I'd love to solve this and have quiet on overrun.

dave
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post #2 of 17 (permalink) Old 07-01-2013, 06:55 AM
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Quote:
Originally Posted by Davemk1 View Post
I know others have written of the noise the Elise makes when off the throttle and the engine is in the 3300 rpm range. My car makes the noise when I'm coasting down and the rpms hit that magic zone and I can stop or change the noise by wiggling the shifter.

I recall seeing a thread a long time back where someone fixed the issue by adding a small weight to the shift linkage on the trans to damp the vibration. I've searched for that thread with no luck.

Anyone know the thread I'm thinking of? I'd love to solve this and have quiet on overrun.

dave
I heard that noise in all three Elise's I owned, and the two Exiges. Became white noise after awhile.

Owned, loved, enjoyed, and now gone:
1969 Europa S2 Blue
1970 Europa S2 White
1974 Europa Twin Cam Blue
1974 Europa Twin Cam Blue
1984 Turbo Esprit Calypso Red
2005 Elise Starlight Black
2005 Elise Saffron Yellow
2005 Elise Ardent Red
2006 Exige Graphite Grey
2007 Exige Canyon Red

Other:
1970 MGB GT
1970 Datsun 510
1984 Honda CRX Si
1984 Pontiac Fiero
2004 Chrysler Crossfire
2009 Pontiac Solstice Coupe
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post #3 of 17 (permalink) Old 07-01-2013, 07:08 AM
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I'm familiar with the thread but I don't think it really had a definitive solution.

I had the exact issue. a buzz that could be stopped by slightly pushing the shifter left or right.

That buzz COMPLETELY went away when I installed the SSC shift cable.
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post #4 of 17 (permalink) Old 07-02-2013, 02:22 PM
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Well I have a super loud buzz at that RPM now after I cut some of the heat shielding that's over the exhaust area. So maybe check that thing...especially where it bolts to the rear license plate holder.
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post #5 of 17 (permalink) Old 07-02-2013, 02:29 PM
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I just fixed mine. It was a broken exhaust manifold tab. I had it welded, and the new engine mount inserts will hopefully keep it from happening again.


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post #6 of 17 (permalink) Old 07-03-2013, 04:14 AM
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Quote:
Originally Posted by Davemk1 View Post
I know others have written of the noise the Elise makes when off the throttle and the engine is in the 3300 rpm range. My car makes the noise when I'm coasting down and the rpms hit that magic zone and I can stop or change the noise by wiggling the shifter.

I recall seeing a thread a long time back where someone fixed the issue by adding a small weight to the shift linkage on the trans to damp the vibration. I've searched for that thread with no luck.

Anyone know the thread I'm thinking of? I'd love to solve this and have quiet on overrun.

dave
That was me.
Send me your email address and I will see if I can find some photos.
It drove me nuts for a couple of years before I nailed it.

2009 Elise S,Rev 400 ,t Ferrea Valves , MWR springs,PPE headers and decat,SSC Harness bar, PenskeDA,Shaved V2 steering arms ,FF engine damper. Saikou Michi catch cans, Modded Toyota E153 gearbox ,60l Proalloy fuel tank , Aeromotive 320 fuel pump,Exedy clutch LSD , SSC ECU, CompositeWorx SP1 seats ,Varexy muffler, Haltech Elite 1500 ECU, Racepak IQ3 Street dash, Aussie-clamhinge.
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post #7 of 17 (permalink) Old 07-03-2013, 05:03 AM Thread Starter
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Originally Posted by RichardNHCooper View Post
That was me.
Send me your email address and I will see if I can find some photos.
It drove me nuts for a couple of years before I nailed it.
I just sent you a PM - thanks!


dave
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post #8 of 17 (permalink) Old 07-03-2013, 07:35 AM
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Originally Posted by Davemk1 View Post
I just sent you a PM - thanks!


dave
Hi Dave I found my old thread.
https://www.lotustalk.com/forums/f101...-sorte-101988/
Good luck.

2009 Elise S,Rev 400 ,t Ferrea Valves , MWR springs,PPE headers and decat,SSC Harness bar, PenskeDA,Shaved V2 steering arms ,FF engine damper. Saikou Michi catch cans, Modded Toyota E153 gearbox ,60l Proalloy fuel tank , Aeromotive 320 fuel pump,Exedy clutch LSD , SSC ECU, CompositeWorx SP1 seats ,Varexy muffler, Haltech Elite 1500 ECU, Racepak IQ3 Street dash, Aussie-clamhinge.
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post #9 of 17 (permalink) Old 07-03-2013, 12:20 PM
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I got under there today and found my buzz was because of the secondary O2 sensor being loose. I only saw it by just grabbing stuff and wigglying.

You never know what you will find with these tin can rattle boxes.
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post #10 of 17 (permalink) Old 07-03-2013, 01:11 PM Thread Starter
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Hi Dave I found my old thread.
https://www.lotustalk.com/forums/f101...-sorte-101988/
Good luck.
Thanks - I'll check it out.

dave
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post #11 of 17 (permalink) Old 07-04-2013, 01:32 AM
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+1 I had an O2 sensor loose also.

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post #12 of 17 (permalink) Old 07-07-2013, 12:24 PM
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i had this annoying buzz after i switched from stock headers with larini decat to ppe headers with decat

it died down after a track day, but still there sometimes...
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post #13 of 17 (permalink) Old 12-03-2017, 06:59 PM
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Quote:
Originally Posted by Robissimo View Post
I'm familiar with the thread but I don't think it really had a definitive solution.

I had the exact issue. a buzz that could be stopped by slightly pushing the shifter left or right.

That buzz COMPLETELY went away when I installed the SSC shift cable.
I know this is an old thread but I've been battling the "off throttle 2900-3500 rpm rattle/buzz" and I'm wondering whether anyone else can declare victory against this one by using the SSC cable. It would be nice to have a few more data points before going through this level of pain. Not doubting Robissimo's experience but I'm not 100% sure my rattle is the same one. In my case it seems like I can modulate the rattle sometimes with the shift lever but certainly not always. At this point I believe I have all other potential sources of this rattle eliminated.

- dynamat and retorqued the shear plate
- dynamat on under trays
- velcro on edge of undertray
- weights on shifter levers on top of tranny
- verified exhaust hanger not broken
- tightened exhaust connections
- checked and spaced heat shields
- checked O2 sensor tighness
- used tailpipe expander to tighten up stock exhaust tips (this fixed a different rattle)
- also have 111hq inserts - great upgrade but had no effect on the targeted buzz

Last edited by aespen; 12-03-2017 at 07:07 PM.
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post #14 of 17 (permalink) Old 12-23-2017, 05:39 PM
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Hey there, yeah... I’ve done all of those things too and was never able to find the source! I did notice recently when looking at new clutches on ACT site it mentions “gear rattle” (IIRC), and it varies based on the clutch. Made me wonder if there is something inherent to gear function in the transmission, and it just being especially noticeable in the Elise.

I did also try machining a custom shift linkage pin, both a little bigger and Delrin instead of steel, where the shift linkage sitting on top of the transmission goes into the slotted piece on the transmission shift shaft, and it still didn’t help.

The one thing that did help a little was installing engine mount stiffeners. It didn’t go away, but with less movement of the engine, the “bouncy” nature of the zzz—zzzz-zzzzz on deceleration was a little less noticeable. Let us know if you find something!

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71 TR6
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post #15 of 17 (permalink) Old 12-23-2017, 06:10 PM
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There was a theory (on the UK Pistonheads site, IIRC) that this noise is made by the clutch disk springs. It would be interesting to get a read from someone who changed to a different disk type.
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post #16 of 17 (permalink) Old 07-27-2018, 01:26 PM
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What is weird about my off on throttle 2200 to 3500rpm buzz is it only happens when the car is warmed up. Before the coolant comes up to temp it does not make the buzzing sound.

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post #17 of 17 (permalink) Old 07-27-2018, 03:15 PM
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Sometimes, but not always, that behavior tells me to look at exhaust system.

Tap around the exhaust with a rubber mallet, gently.

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