High RPM acceleration sound - Ford Mustang Forum
 
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post #1 of 12 (permalink) Old 09-05-2013 Thread Starter
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High RPM acceleration sound

Hey, guys. Ever since I started running my Lund tune, right after I ran a bama I started to notice a rattle at high RPM acceleration(it could have started before that, just more quietly). I initially thought it was some sort of exhaust rattle, but after the past week or so I've started to question that. At about 5,000RPM give or take a little, it starts to sound like some kind of metal flapping up against metal(that's all I can think of to compare it to). Maybe like an aluminum sheet hitting something at a very high speed, which is what made me think it was exhaust that was loose or something, but I have checked all of my exhaust numerous times to make sure it's tight. Also, I believe it gets louder in a 3rd gear acceleration, than 1st or 2nd, but that could just be me. I know people have had problems with the driveshaft, but with my mods, and speeds that I'm going, I didn't really think it could be that. I just wanted a few opinions though. Thanks.


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post #2 of 12 (permalink) Old 09-05-2013
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Not sure if ford fixed the problem, but on the 05 mustangs with manual trans there was a separator plate between the motor and the trans ( just a piece of sheet metal) that would rattle at certain rpms even if all bolts were tight. It was fixed by putting washers in between so there was no wiggle room. Not sure if the newer cars have the same plate, may be something worth looking into

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post #3 of 12 (permalink) Old 09-05-2013
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The "rattle" that your hearing could be engine knock or ping. It happens from timing being to aggressive on the tune and gas detonating to early or to late. Have you asked lund about it?


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post #4 of 12 (permalink) Old 09-05-2013 Thread Starter
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After being under the car I have noticed what you are talking about, but when I shook it it didn't move so I didn't suspect it of anything. Thanks for the input!

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post #5 of 12 (permalink) Old 09-05-2013
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Can you get some audio of it to share? Easier to diagnose then.


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post #6 of 12 (permalink) Old 09-05-2013 Thread Starter
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I tried to get a video of it earlier, but with the exhaust and road noise I couldn't hear it on the video.. But as far as the knock goes... I have not asked them, But to me it doesn't come from the engine, it comes more from right by the x-pipe, and also the front end of driveshaft where the sheet metal is. Does the sound come directly from the engine or would I hear it further back if it was a knock? And I'm not sure if this matters or not, but I tried just doing a rev while in park, and it makes no sound in higher RPM.

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post #7 of 12 (permalink) Old 09-05-2013
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I have this same thing happing to my car also.
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post #8 of 12 (permalink) Old 09-05-2013
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Quote:
Originally Posted by Colby2013 View Post
I tried to get a video of it earlier, but with the exhaust and road noise I couldn't hear it on the video.. But as far as the knock goes... I have not asked them, But to me it doesn't come from the engine, it comes more from right by the x-pipe, and also the front end of driveshaft where the sheet metal is. Does the sound come directly from the engine or would I hear it further back if it was a knock? And I'm not sure if this matters or not, but I tried just doing a rev while in park, and it makes no sound in higher RPM.
If it only does it under load, it very well could be knock. Datalog your car and send it to Lund so he can look at it


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post #9 of 12 (permalink) Old 09-07-2013
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If your tune is an 'open' tune (all of mine are), see what your 'global spark' is set at. My tunes run best set at O.

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Could it be that the Lund tune isn't all that........

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It isn't really knocking....it is pinging. It should sound like marbles or BB inside of a can. Is that what is happening? If so that is tune related and ignition timing should be backed off some.

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Quote:
Originally Posted by Colby2013 View Post
Hey, guys. Ever since I started running my Lund tune, right after I ran a bama I started to notice a rattle at high RPM acceleration(it could have started before that, just more quietly). I initially thought it was some sort of exhaust rattle, but after the past week or so I've started to question that. At about 5,000RPM give or take a little, it starts to sound like some kind of metal flapping up against metal(that's all I can think of to compare it to). Maybe like an aluminum sheet hitting something at a very high speed, which is what made me think it was exhaust that was loose or something, but I have checked all of my exhaust numerous times to make sure it's tight. Also, I believe it gets louder in a 3rd gear acceleration, than 1st or 2nd, but that could just be me. I know people have had problems with the driveshaft, but with my mods, and speeds that I'm going, I didn't really think it could be that. I just wanted a few opinions though. Thanks.
It sounds like you're just experiencing a slight pinging. This can be adjusted within the tune very easily. I would recommend just giving your tuner a call and they can make a few small adjustments. This should fix your issue!

I hope this helps.

-Dan

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