GeorgeW Posted July 23, 2015 Posted July 23, 2015 Now, this is my first 350z, and not sure if its normal - i'm guessing it bad.. So its got a full new exhaust system - motorsport or something like that - I didn't put it on. Its a 2004 and has done 68,000 miles, has full service history, and an MOT last month with no advisories, and idles fine, with a lowely rumble from the exhaust. Also has plenty of power. But if I, for example, chug along in 3rd gear at about 2000 revs, and put my foot down, its got a very odd 'metalic' noise, until it gets to about 3500 revs. The rest of the revs are great with no issues and it changes gear fine. Is this a concern or does the zed just not like very low revs? George Quote
GeorgeW Posted July 23, 2015 Author Posted July 23, 2015 not sure, how many are there? I'm guessing it SOMETHING rattling, as its only at low revs, which gives a hell of a rumble! where would I look for that? Quote
GreenLandy Posted July 23, 2015 Posted July 23, 2015 Stick it over a pit/on a lift and rev until you hear it and see where it's coming from Quote
Zeezeebaba Posted July 23, 2015 Posted July 23, 2015 Is the noise from the rear or does it sound more front end? Firstly check the heat shield above the rear exhaust back box, this one usually goes where the bolt secures it to the underside of the car. A washer usually sorts this. Secondly check the catalytic converters and associated heat shields these are more front biased sounding when in the car. Also whilst under the car remove any stones from the under trays and any components wide enough to trap them. The Z likes collecting stones. Another area to clean out is the rear arches, this will unlikely be an area that causes noise but a build up of dirt and mud on the inner arch lip can lead to corrosion later on. 1 Quote
GeorgeW Posted July 23, 2015 Author Posted July 23, 2015 thanks for the quick responses. I think it will be a heat shield as well, I will get it up a ramp when I can and check. I don't think its anything serious as handling and performance isn't affected. Quote
greg tl Posted July 23, 2015 Posted July 23, 2015 what clutch do you have in it? Is it a standard one or has it been changed to single fly wheel maybe? Quote
GeorgeW Posted July 23, 2015 Author Posted July 23, 2015 as far as i know its a standard clutch Quote
veilside z Posted July 23, 2015 Posted July 23, 2015 The ramp would be the best bet buddy, just to eliminate a few issues and hopefully nail the cause. Quote
Ollydykins Posted August 15, 2015 Posted August 15, 2015 I have a similar car, exhaust put on and also, had a similar problem, it turned out to be my exhaust bracket had sheared, nothing major, just a weld, but that cured mine Quote
Stutopia Posted August 15, 2015 Posted August 15, 2015 In addition to the sensible stuff already, when you do look underneath, may as well check the aftermarket exhaust clears the big W brace. Mine was touching it for a little while and made a racket at lower revs. Quote
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