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R33 Makes Really Bad Rattle @ 3k Rpm

Awesome

By Awesome,
in Engines & Forced Induction

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Awesome Collaborator

Awesome

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Hey, recently my Non-turbo R33 has been rattling @ 3000 rpm.. only.

I'm really unsure what it is but sounds really bad going to have to take it to the mechanic next week when i have time off work.

Anyone know what it is and how much it'll cost to fix it?

Thanks

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Awesome Collaborator

Awesome

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Posted (edited)
Get a good brand cat back.

No supercheap shit.

No Generic mufflers

No X-force

And yes. It will fix the problem

A Cat - back is a PIECE Of the exhaust yeah? If i may ask, how many parts are there? I know theres the catalytic converter & the muffler which is the end tip of it..

whats a good brand cat back ? and price im looking at is a few hundred, nothing too fancy..

sry im a nubie. so basically. getting a CATBACK for my car will fix the problem, i have also gotten a new muffler & a catalytic converter so its not that yeah..

p.s natho, can't a kid learn about cars? guess u know every pucking thing about cars u nerd.

Edited by Awesome
Eug Grand Master

Eug

Posted
Posted

hey there mate. how to put it simply?

when someone says 'catback exhaust' what they are referring to is the exhaust section from the catalytic converter onwards (i.e. back) so from the cat to the back of the car.

a full exhaust system comprises of: headers (also known as extractors), possibly a connecting pipe depending on design, catalytic converter, maybe another connecting pipe, then followed by a muffler system.

ok the sound at 3,000rpm appears to be a twin cam, 6 cylinder harmonics or something (i'm not 100% sure on this). however i have heard similar sounds on many twin cam, inline 6 or v6 engines.

i had it on my stock system and i also have it on my r33 gtr exhaust which i have installed onto my r33 gts. it's a matter of trial and error i know people who have bolted on aftermarket exhaust systems and still had the rattle. the type of exhaust material also plays a part into the muffling or dampening of the sound.

a wild guess here, but a light stainless steel or titanium exhaust will "ring" and transfer the harmonics and/or sound much more than an exhaust system constructed of mild steel.

the sound annoys me a lot too! but sound doesn't equal performance so it's low on my list of things to do.

p.s. - yes a kid can learn about cars! have a google around and do some reading around the past threads in the forum, there's a myriad of information just waiting to be searched. i can assure you that 90% of your questions have already been answered before. if not feel free to ask away like you have done so here. hope that helps!

Awesome Collaborator

Awesome

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Posted (edited)

Thanks for your reply EUG.

The only thing i don't understand is how i got my MUFFLER And my Catalytic Converter REPLACED and it still hasnt fixxed the problem.

So far i believe the "catbacK" is the WHOLE Exhaust pipe thing including the muffler& (NOT INCLUDING catalytic converter)..? please confirm.

Now, if thats true, why don't people just say exhaust.. Why do they say 'cat back' i'm sorry for being n00b.

one last thing, all i want to know is what i need for it to be FIXXED. Which part..

Edited by Awesome
central coast person Proficient

central coast person

Posted
Posted

what are the brands of muffler and cat???

like Eug said do you know if you have stainless steel because it will make it resonate. if you want to get rid of this you will have to completely change you cat back system

a 2.5" system will restrict it resonating and you also said in another thread the comparison of twin tip and single. Varex defiantly wont fix this problem because its not a great brand (x-force) the best thing (and what i do) is PM people with the problem by searching forums and ask if they have fixed it and how because i dont know what brands will help with this as its a characteristic with the car.

central coast person Proficient

central coast person

Posted
Posted (edited)

judging by the searches ive done people are saying rattling and all symptoms sound the same but ive read one fixed with coil packs, the others a new cat and some bearings. auto or mannual they all seem to get it so im going to say its not a gearbox problem. Im lost for ideas, when mine is up and running ill get my uncle to see what it is if no one finds a solution. hes like my master sensay :P haha

Edited by central coast person
MBS206 Grand Master

MBS206

Posted
Posted
sounds like from the exhaust to me.. :|

Just thought I'd check, as to me, when someone says "it's rattling at 3000RPM" I'd be thinking "OH god, engine is on it's way out and knocking"

But if it's from the exhaust, and you're sure it's the exhaust note sounding "rattly" then that's all good.

central coast person Proficient

central coast person

Posted
Posted
Just thought I'd check, as to me, when someone says "it's rattling at 3000RPM" I'd be thinking "OH god, engine is on it's way out and knocking"

But if it's from the exhaust, and you're sure it's the exhaust note sounding "rattly" then that's all good.

engines go "tick, tick, tick" the bottle even says for noisy lifters :P haha

i doubt its the engine because i have mine out of my car at the moment and everything is being upgraded so we have taken every single piece of my engine apart and reconditioned it and all the components like seats and lifters and valves, ect are being re used so the top end wasnt the problem for noise. Main and Con rod bearings do make a metallic chattering sound when dieing..............again once my engine is together ill see if that solved my problem but it didnt sound like it was the engine it was around the gearbox and id expect the lights to come on once the engine is dieing and making noise like that.

GTS4WD Grand Master

GTS4WD

Posted
Posted

I think people are throwing the wrong words around.

“Resonating” and “Rattling” are not interchangeable.

To resonate means that a vibration of large amplitude in a mechanical system caused by a relatively small stimulus so as the vibration is amplified. Essentially.

And we all know what a “rattle” is. So a completely different symptom.

I personally had the same problem. I replaced my stock catback with a 3” Nismo Catback

I Have heard of other that have stopped it too with a new exhaust.

As explained in the thread i posted. In the later R33's they had a butterfly that stayed closed at lower throttle imputs to lessen the severity of the metallic resonating.

how-exhausts-work_large.jpg

This may help. A "Catback" exhaust is from the catalytic converter to the exhaust tip.

Awesome Collaborator

Awesome

Posted
  • Author
Posted

I'M GOING TO BUY THIS ...

http://www.skylinesaustralia.com/forums/R3...st-t242143.html

or

http://www.skylinesaustralia.com/forums/3-...st-t230324.html

WILL IT FIT MY R33?

& WILL IT FIX THE PROBLEM.

& which one SHOULD I BUY??

WHICH ONE IS BETTER/LEGAL/LOUDER.

THE 2ND ONE STATES ITS CUSTOM.." WILL IT FIT MY CAR??"

P.S THE SOUND IS LIKE RESONATING.... THE EXHAUST DOES VIBRATE AND DOES DISPATCH A VERY LOUD SOUND. SO I GUESS ITS NOT A 'RATTLE'

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