Exhaust Snapping noise under heavy acceleration and cold start

[BloodyshoedFR-S]

I just got a new catback exhaust a few months ago, the Spec D N1 knock off. After I got it I noticed that there was a weird almost snapping noise under moderate to hard acceleration but only between around 2,700 rpm and stopped at around 4,000 rpm. When I am cruising and accelerate it makes that snapping noise again. It isn't like a Honda rasp. It's a strange sound that I never had before the exhaust. I now have a WORKS Motorsports stage 2 turbo kit on the car. I was hoping that would help with the snapping noise but didn't help. The headers I bought and dual resonated front pipe didn't help either. The car performs great but that snapping noise drives me nuts. Has anyone heard anything about this dilemma before? If so, what fixes it?

[humfrz]

Originally Posted by BloodyshoedFR-S

I just got a new catback exhaust a few months ago, the Spec D N1 knock off. After I got it I noticed that there was a weird almost snapping noise under moderate to hard acceleration but only between around 2,700 rpm and stopped at around 4,000 rpm. When I am cruising and accelerate it makes that snapping noise again. It isn't like a Honda rasp. It's a strange sound that I never had before the exhaust. I now have a WORKS Motorsports stage 2 turbo kit on the car. I was hoping that would help with the snapping noise but didn't help. The headers I bought and dual resonated front pipe didn't help either. The car performs great but that snapping noise drives me nuts. Has anyone heard anything about this dilemma before? If so, what fixes it?

Well now, that's got to be aggravating ..

So, if you take that cat back off, does the "snapping" noise go away?

Is the "snapping" noise like in the exhaust note or more like an exhaust leak?

Can you take and post a video?



humfrz

[BloodyshoedFR-S]

Originally Posted by humfrz

Well now, that's got to be aggravating ..

So, if you take that cat back off, does the "snapping" noise go away?

Is the "snapping" noise like in the exhaust note or more like an exhaust leak?

Can you take and post a video?



humfrz

It's definitely not an exhaust leak as I have gone over every gasket on the car and felt for leaks everywhere. I will go take a video right now

[BloodyshoedFR-S]

Originally Posted by BloodyshoedFR-S

It's definitely not an exhaust leak as I have gone over every gasket on the car and felt for leaks everywhere. I will go take a video right now

Okay I uploaded it to youtube because I couldn't do it straight from my phone. Sorry about the wind noise but you can still hear the snapping in the exhaust note.

[humfrz]

Originally Posted by BloodyshoedFR-S

Okay I uploaded it to youtube because I couldn't do it straight from my phone. Sorry about the wind noise but you can still hear the snapping in the exhaust note.

Well, my ears can't separate out your snapping noise from the wind noise ..

You say it also makes the snapping noise on a cold start. I suggest you make another video at a cold start .. that will eliminate the wind noise.


humfrz

[BloodyshoedFR-S]

Originally Posted by humfrz

Well, my ears can't separate out your snapping noise from the wind noise ..

You say it also makes the snapping noise on a cold start. I suggest you make another video at a cold start .. that will eliminate the wind noise.


humfrz

I'm sorry. Hopefully this is a better video. You can especially hear it at 33 seconds.

[humfrz]

Originally Posted by BloodyshoedFR-S

I'm sorry. Hopefully this is a better video. You can especially hear it at 33 seconds.

Good video. I can clearly hear that "snapping" sound (noise).

It sort of sounds like to me an old 1940s car with a straight pipe, not a pleasing sound.

My only suggestion is to switch out the cat back with another muffler to see if that will keep that sound from coming out.

Others will want to know what type of header and front pipe you are running. Knowing this may help sort out the sound.

I'm not an exhaust expert. For all I know, that's the way a Spec D N1 knock off cat back sounds ..

Maybe help will be along soon.




humfrz

[BloodyshoedFR-S]

Originally Posted by humfrz

Good video. I can clearly hear that "snapping" sound (noise).

It sort of sounds like to me an old 1940s car with a straight pipe, not a pleasing sound.

My only suggestion is to switch out the cat back with another muffler to see if that will keep that sound from coming out.

Others will want to know what type of header and front pipe you are running. Knowing this may help sort out the sound.

I'm not an exhaust expert. For all I know, that's the way a Spec D N1 knock off cat back sounds ..

Maybe help will be along soon.




humfrz

I will try putting on my old exhaust which is just stock with a muffler delete. I got the spec d because I like the tips and didn't want to pay 600+ dollars for different exhaust tips. I looked into getting just the tips welded on but it would've been a pain to make them fit. If anyone wants to know, I am running Tsudo UEL Headers, I have no overpipe because the WORKS turbo kit uses a pipe that retains the factory header output position to feed the turbo. I have a 1320 Performance dual resonated test pipe. No cats in the system. If all else fails I may have to just weld in a few more resonators.

[sid94]

Possible direct injection seals taking a shit..

There was a thread with a video on the noise it makes that I can’t find now of all times and I know there’s another thread with video on how to replace them just do a quick search. If it is your problem it’s fairly easy to change.

Also what serpentine belt do you have? I’ve seen some really shitty belts at work that cause an electrical discharge and make the same snapping noise. Doubt that’s your problem but hey anything helps when you’re in the dark right lol


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[BloodyshoedFR-S]

Originally Posted by sid94

Possible direct injection seals taking a shit..

There was a thread with a video on the noise it makes that I can’t find now of all times and I know there’s another thread with video on how to replace them just do a quick search. If it is your problem it’s fairly easy to change.

Also what serpentine belt do you have? I’ve seen some really shitty belts at work that cause an electrical discharge and make the same snapping noise. Doubt that’s your problem but hey anything helps when you’re in the dark right lol


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I'll look into the direct injection seals. I don't think it is that because it only started after I put on the spec d exhaust. I also just have the oem serpentine belt as far as I know. It had 50k miles on it when I bought the car so I'm assuming the belt has been replaced at least once.

[sid94]

Originally Posted by BloodyshoedFR-S

I'll look into the direct injection seals. I don't think it is that because it only started after I put on the spec d exhaust. I also just have the oem serpentine belt as far as I know. It had 50k miles on it when I bought the car so I'm assuming the belt has been replaced at least once.

Probably not nowadays belts last a lot longer then before and as for the correlation between the exhaust and the noise it could just be coincidence I’ll look around and see if I find the thread


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[BloodyshoedFR-S]

Originally Posted by sid94

Probably not nowadays belts last a lot longer then before and as for the correlation between the exhaust and the noise it could just be coincidence I’ll look around and see if I find the thread


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I'm also going to try and put on my stock catback with muffler delete to make sure it's the spec d exhaust not something else

[sid94]

http://www.ft86club.com/forums/showt...Injector+seals

Post number 6 has the video I was talking about where you can hear the noise


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[BloodyshoedFR-S]

Originally Posted by sid94

http://www.ft86club.com/forums/showt...Injector+seals

Post number 6 has the video I was talking about where you can hear the noise


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Well I'm happy to say that definitely is not the noise I am hearing. I posted a link to a YouTube video of the noise. Could you take a look at it? See if maybe it reminds you of anything?