something you all might want to check over

Methodical4u

I've got 600 and some odd miles on my ART pipes and about 250 on my F.I. CBE now. I had been hearing a hiss, but only when letting off the gas.

So I got under the car tonight and checked all of the bolts... ALL of them were able to be turned at least a little bit. They were fully tightened when the install was done, but it was on the floor with a jack, so full leverage was difficult, but still all bolts were tightened to the point they were not able to be anymore, and they still came a little loose.. just might want to give them a quick check with a wrench.

Just a quick note that anyone who did their own install might want to take a look at.

Motordyne

That's part of the reason why they tighten the bolts so much at the factory. They are tightened to the point of stretching/straining the bolt so it will never loosen up from the thermal cycles.

WAGAWAGA

Did the hiss clear as well?

ScGRaceR

part of modding!

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Methodical4u

yes, quite a bit of it did... some of the hiss sound is actually the ART pipes still breaking in... I have another 800 miles to put on them before the 1500 that Tony says it takes for them to run through all 3 of their cycles.

Methodical4u

UPDATE: Ok guys, I had realized that I had forgotten to tighten the bolts from the headers to the ART pipes. The demon bolts were first... the passanger side was pretty tight but I could get about 1/2 to 3/4 of a turn on it. The drivers side however was MUCH more loose and I got 1 and 1/2 - 2 turns on it. THe other bolts also could be tightened at least a little bit. I suggest those with gasket problems make COMPLETELY sure that the bolts are fully tightened... if they are, I wouldn't imagine there would be much of a way the gasket could blow out. I don't know if some realize how loose the bolts can get.

Motordyne

Tighten them all down upon installation and if possible, tighten them again after a few thermal cycles.

Thermal cycles have a way of playing with bolt tension.

Methodical4u

Tony, when I tightened down the drivers side last night and I started it up, it had a rattle like maybe it was a heat shield that had maybe gotten pushed over a bit... any idea where that would be right off hand?

Motordyne

The bracket bolt for the stock cats may be it. Otherwise, check it to really know.

Footloose301

Should the engine be warm or cold when trying to get the bolts tighter?

Perhaps this is whats causing my SES light to pop on every 400 miles or so. They were fine for the first 4000 miles or so and then I began getting SES lights.

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2010 40th Anniversary 370Z

Motordyne

Ideally, room temperature so all the various integrating parts are at the same temperature.

Footloose301

Alright. I'll check out the bolts this Wednesday night when I begin throwing on the Swift springs. I'm hoping they're just loose and its not something more major.

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2010 40th Anniversary 370Z

Methodical4u

ok, today I jacked the car up and got underneath of it. I pushed on a few of the heat shields and the sound did not change. I have my Fiancee' rev the car and only when revving it does it make the noise.

I am wondering if I am getting that sound others have talked about with the ART pipes going through another stage. Up until now (800 miles on them) I have had NO sounds. I find it ironic that when I tighten them up that all of a sudden it would make this noise. It does sound like it could be the pipes... it also sounds like it might not be. Under normal idle or just cruising, the car does not make the noise at all. However, under load or when the revs come up it does make. It if it was a heat shield wouldn't it be more likely to do it all the time?

Footloose301

You're going to have hiss when you remove stock cats.... The ART pipes just make less sound than other test pipes. I have 5500 miles on my ART pipes.

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2010 40th Anniversary 370Z

Methodical4u

No, the hiss is mostly gone... and I can deal with that. I just want to know if this metal sound I hear is in the ART pipes just breaking in or if a heat shield is rubbing... as I said, I got under the car today and could see no where it would be rubbing. I was under the car and had my Fiancee' just give it a little gas while I pushed on different areas and there was no sound changes.

I think I may just give it some more miles and see if it stops, but if I get the chance my friend does have a lift which would be much easier to see that was is the problem.