Cold start test pipe rattle

RanRich · 07-11-2017, 04:54 PM

I have a used set of Fast Intentions RTP's (~10K miles) mated to a custom catback, pictured below, and for the first 5-10 minutes of every drive I have to keep the car under 2500rpm or else I experience a metallic-y rattle sound coming from the test pipe area. Once the exhaust is good and hot it goes away, but on a cold start it sounds like trash.

The resonators on each of the test pipes had a gash in the perforated pipe, and you could hear the packing was a bit loose in one of them before they were installed, but I figured this wouldn't be a problem. Are all test pipes or resonated test pipes like this? I know what rasp sounds like and this is more tinny and metallic, so that can't be it.

Looking for some input.

acorona370 · 07-12-2017, 10:32 AM

I might be wrong but i have the same problem. Everyone has told me its the heat shields but no one has told me out to fix it...

SG4247 · 07-12-2017, 01:37 PM

Hmm,

I just installed a set of ebay test pipes (Manzo) to mate up to my Ackrapovich CBE. After about two weeks of daily driving the drivers side test pipe started a ringing/rattle noise when cold at idle.

I jacked the car up and gave all the bolts a pull with a 1/2" drive. I also checked all the heat shields, and all seemed good.

Let the car back down and the noise was still present. Several days later I took it over to a buddies shop. I stayed in the running car while he raised it up on the lift.

After checking it over with a stethescope, he said "hey this rattle is originating from the drivers side test pipe", "all the heat shields are good".

I had him pull the O2 sensors on that side thinking the tip might have broke off one, and they were fine.

Next I Plan to loosen up the flange joint and see if there is loose material in the test pipe or some kind of cracks/damage. Just havent had time yet.

07-11-2017, 04:54 PM	#1 (permalink)
RanRich Enthusiast Member Join Date: Mar 2015 Location: St. Louis Posts: 425 Drives: 09 PG Sport M6 Rep Power: 3372	Cold start test pipe rattle I have a used set of Fast Intentions RTP's (~10K miles) mated to a custom catback, pictured below, and for the first 5-10 minutes of every drive I have to keep the car under 2500rpm or else I experience a metallic-y rattle sound coming from the test pipe area. Once the exhaust is good and hot it goes away, but on a cold start it sounds like trash. The resonators on each of the test pipes had a gash in the perforated pipe, and you could hear the packing was a bit loose in one of them before they were installed, but I figured this wouldn't be a problem. Are all test pipes or resonated test pipes like this? I know what rasp sounds like and this is more tinny and metallic, so that can't be it. Looking for some input. __________________ AAM \| Dynosty \| Ecutek \| Eibach \| Hawk \| H&R \| Nismo \| Stillen \| Stoptech \| Z1

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07-12-2017, 10:32 AM	#2 (permalink)
acorona370 Base Member Join Date: May 2016 Location: Schaumburg Posts: 62 Drives: 370Z Nismo 2014 Rep Power: 9	I might be wrong but i have the same problem. Everyone has told me its the heat shields but no one has told me out to fix it...

07-12-2017, 01:37 PM	#3 (permalink)
SG4247 Track Member Join Date: Oct 2016 Location: OKC Posts: 785 Drives: 2010 touring Rep Power: 7842	Hmm, I just installed a set of ebay test pipes (Manzo) to mate up to my Ackrapovich CBE. After about two weeks of daily driving the drivers side test pipe started a ringing/rattle noise when cold at idle. I jacked the car up and gave all the bolts a pull with a 1/2" drive. I also checked all the heat shields, and all seemed good. Let the car back down and the noise was still present. Several days later I took it over to a buddies shop. I stayed in the running car while he raised it up on the lift. After checking it over with a stethescope, he said "hey this rattle is originating from the drivers side test pipe", "all the heat shields are good". I had him pull the O2 sensors on that side thinking the tip might have broke off one, and they were fine. Next I Plan to loosen up the flange joint and see if there is loose material in the test pipe or some kind of cracks/damage. Just havent had time yet.