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  #1  
Old 08-03-2015, 03:50 PM
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AFE Intake Brake Boosting Video

I know many of you have wondered what the AFE intake sounds like on our Grand Cherokee EcoDiesel. Here is short video I took last night. It does sound much better in person. What you do not here in the video is the occasional whistle sound that you get when driving and releasing the throttle.
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  #2  
Old 08-03-2015, 08:46 PM
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Re: AFE Intake Brake Boosting Video

Yup, sounds like mine. I'm not a huge fan of the "chuf chuf chuf" sound when you let off the go pedal in the video. I could be mistaken, but sounds a little like surge to me. I never hear that sound driving around though.

I wish you would've rev'd it to about 2k and hammered down though while shooting video. The ecodiesel is surprisingly quick off the line. I have no doubt the 5k lb Jeep would spank my VW Golf from 0-60'.
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Old 08-04-2015, 06:06 PM
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Re: AFE Intake Brake Boosting Video

That is a strange sound - can't be surge since diesels don't have a throttle plate.
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Old 08-04-2015, 06:17 PM
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Re: AFE Intake Brake Boosting Video

I never heard that before. There must be a way to eliminate that sound.
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Old 08-04-2015, 06:55 PM
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Re: AFE Intake Brake Boosting Video

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Originally Posted by hayasa View Post
That is a strange sound - can't be surge since diesels don't have a throttle plate.

Turbo Diesels most definitely can surge. Both at WOT while the turbo is ramping up, and when suddenly getting off the throttle after a WOT event. I've experienced surge both by sound and watching it in logs and on gages while getting my TDI tuned.
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Old 08-05-2015, 02:06 AM
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Re: AFE Intake Brake Boosting Video

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Originally Posted by farfromovin View Post
Turbo Diesels most definitely can surge. Both at WOT while the turbo is ramping up, and when suddenly getting off the throttle after a WOT event. I've experienced surge both by sound and watching it in logs and on gages while getting my TDI tuned.

Diesel engine is always at WOT, because there is no throttle...

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Old 08-05-2015, 08:29 AM
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Re: AFE Intake Brake Boosting Video

I never hear the surge while driving around either. Just did it when doing the brake boosting.
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Old 08-05-2015, 01:54 PM
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Re: AFE Intake Brake Boosting Video

So after reading a few online articles, I've learned that apparently diesels can surge but it is pretty rare and only if the turbo is improperly sized, if there are intake blockages, or the venting isn't routed back to the ambient intake piping. Basically just a temporary overboost condition. Just shouldn't happen in a modern stock diesel engine not under load. Really wonder what is happening to your vehicle, and if that is happening to ours, too.

Edit: If you are brake boosting, then I think your are really doing it under severe load, and maybe that is why you are getting the surges.
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  #9  
Old 08-06-2015, 10:27 AM
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Re: AFE Intake Brake Boosting Video

I don't care about the noise. Did the intake measurably improve your 0-60 or anything?
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Old 08-06-2015, 03:36 PM
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Re: AFE Intake Brake Boosting Video

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Originally Posted by Suns_PSD View Post
I don't care about the noise. Did the intake measurably improve your 0-60 or anything?

I didn't measure, but I'm sure it didn't. What it does do is provide a reliable air filter, unlike OEM.
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Old 08-06-2015, 04:48 PM
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Re: AFE Intake Brake Boosting Video

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Originally Posted by farfromovin View Post
What it does do is provide a reliable air filter, unlike OEM.
You mean like the gasket splitting, or something else?
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  #12  
Old 08-06-2015, 05:28 PM
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Re: AFE Intake Brake Boosting Video

On our stock boost levels, I doubt it does much if anything for hp. If it does give 5hp, you wouldn't be able to tell the difference.
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