Discussion
I have just put my track day r53 on the road after passing it's MOT & am having an issue with noise & wanted some advice as I have done lots to it & not 100% sure what is the cause/remedy.
It may sound (sic) obvious but maybe not, so here goes.
Usual engine/intake/charger/cooler mods complete with Toyosports 200 cell cat & full cat back system complete with resonator.
Poly-engine & suspension mounts all round front & rear.
I have what I can only describe as exhaust boom at 3k rpm, which is annoyingly at where the car is normally driven on the road and it needs to be useable on the road.
I have added sound deadening to the hatch floor, parcel shelf etc with some reduction in the sound.
Having done this I took the car to Keltec & Tony Banks in Leeds, one said he would use the same size boxes etc & couldn't see anything obviously different to what he would do & that it could help putting 1000 miles on it before getting serious, the other one just wanted to fit a different resonator without even looking at it.
My questions are three-fold:
1. Is it likely to change much after a thousand miles?
2. If needs be I am willing to change the full system if there is one out there which is more like road car noise levels, any advice?
3. Are the engine poly-bushes likely to be part/all of the remaining noise issue?
It may sound (sic) obvious but maybe not, so here goes.
Usual engine/intake/charger/cooler mods complete with Toyosports 200 cell cat & full cat back system complete with resonator.
Poly-engine & suspension mounts all round front & rear.
I have what I can only describe as exhaust boom at 3k rpm, which is annoyingly at where the car is normally driven on the road and it needs to be useable on the road.
I have added sound deadening to the hatch floor, parcel shelf etc with some reduction in the sound.
Having done this I took the car to Keltec & Tony Banks in Leeds, one said he would use the same size boxes etc & couldn't see anything obviously different to what he would do & that it could help putting 1000 miles on it before getting serious, the other one just wanted to fit a different resonator without even looking at it.
My questions are three-fold:
1. Is it likely to change much after a thousand miles?
2. If needs be I am willing to change the full system if there is one out there which is more like road car noise levels, any advice?
3. Are the engine poly-bushes likely to be part/all of the remaining noise issue?
I would say after 1000 miles it'll be settled in. I can only assume this is a resonance/harmonic issue with your exhaust - the only way to tell would be to either replace the whole exhaust from cat back to confirm, or possibly remove/add a resonator to the current system.
Do you have an old stock system to hand you could fit as a test? Maybe weld in a stock cat to see if that makes a difference?
I've had it at 2k on another car, it can be very annoying but in my case was definitely the harmonics of the exhaust
Do you have an old stock system to hand you could fit as a test? Maybe weld in a stock cat to see if that makes a difference?
I've had it at 2k on another car, it can be very annoying but in my case was definitely the harmonics of the exhaust
I will give it the 1000 miles then & see what happens, I do have a noise meter, so can define exactly any difference even if I can't notice any, which may help.
Unfortunately my standard system was completely goosed & that was part of the driver in the change if I am honest.
There is a resonator in the new system so that should have helped.
I just wasn't sure if the poly bushing to the engine mounts may have added to the issue, hence the question.
Also does the "one ball" mod add any significant sound over the original set-up?
If I have to I will revert to completely stock as it is unacceptable like it is.
Unfortunately my standard system was completely goosed & that was part of the driver in the change if I am honest.
There is a resonator in the new system so that should have helped.
I just wasn't sure if the poly bushing to the engine mounts may have added to the issue, hence the question.
Also does the "one ball" mod add any significant sound over the original set-up?
If I have to I will revert to completely stock as it is unacceptable like it is.
E-bmw said:
I will give it the 1000 miles then & see what happens, I do have a noise meter, so can define exactly any difference even if I can't notice any, which may help.
Unfortunately my standard system was completely goosed & that was part of the driver in the change if I am honest.
There is a resonator in the new system so that should have helped.
I just wasn't sure if the poly bushing to the engine mounts may have added to the issue, hence the question.
Also does the "one ball" mod add any significant sound over the original set-up?
If I have to I will revert to completely stock as it is unacceptable like it is.
The engine mount change shouldn't have caused any issues like this. Something that has come to mind would be to check none of the heat shielding (either manifold or under the car) is touching the exhaust.Unfortunately my standard system was completely goosed & that was part of the driver in the change if I am honest.
There is a resonator in the new system so that should have helped.
I just wasn't sure if the poly bushing to the engine mounts may have added to the issue, hence the question.
Also does the "one ball" mod add any significant sound over the original set-up?
If I have to I will revert to completely stock as it is unacceptable like it is.
From memory, the one-ball makes it a little louder and potentially a bit drone-y but still fairly subtle, compared to aftermarket stuff. Think you get some more pops and bangs as well
three things..........
the thousand miles is nonsense
check the exhaust where it runs over the centre brace isn't rammed against the bump stops especially top, if it is get it off there
fit a JCW catback, it sorts exhaust drone, period.
Due to the many opinions regarding which exhaust, if you want to contribute towards time spent I'll even attempt to prove it by fitting my own excellent condition original one piece full catback or my recent JCW system currently on my car, onto a vehicle owned by someone doubting it would work haha.
My exhaust is currently mated to an engine with circa 270chp, all Vibratechnics mounts, and this custom manifold under test, with straight decat pipe.
Drone free, no rear seats, just carpet covering the gap. There is noise, but it's due to semi helical final drive gears and the state of tune, 'not' drone ;O)
the thousand miles is nonsense
check the exhaust where it runs over the centre brace isn't rammed against the bump stops especially top, if it is get it off there
fit a JCW catback, it sorts exhaust drone, period.
Due to the many opinions regarding which exhaust, if you want to contribute towards time spent I'll even attempt to prove it by fitting my own excellent condition original one piece full catback or my recent JCW system currently on my car, onto a vehicle owned by someone doubting it would work haha.
My exhaust is currently mated to an engine with circa 270chp, all Vibratechnics mounts, and this custom manifold under test, with straight decat pipe.
Drone free, no rear seats, just carpet covering the gap. There is noise, but it's due to semi helical final drive gears and the state of tune, 'not' drone ;O)
CarsOrBikes said:
the thousand miles is nonsense
Nice to know, thanks for that, I did wonder how it could be so.CarsOrBikes said:
check the exhaust where it runs over the centre brace isn't rammed against the bump stops especially top, if it is get it off there
I will have a look & see, I take it you mean that the exhaust should be "suspended" by the rubber rather than jamming it up/down?CarsOrBikes said:
fit a JCW catback, it sorts exhaust drone, period.
I don't doubt you, but if that is the case then why do "aftermarket manufacturers" make such a stuff-up of copying them?the rubbers above the centre brace are 'not' mounts, they're bump stops and there should be a gap above and below, you'll see (if you take your time looking at them) what I mean
the aftermarket concentrate on sound out the back, and tend to use larger bore pipe, smaller absorption type silencers, and can have poor fit too, all contributing to drone, even loading of the hangers affects it. Pipe sizing affects power as well as sound, and bigger is not always better, but I guess those that want to believe, will. I have one in the garage I fitted for a bit of an experiment, it was crazy! I had to try it haha, R53 with 2.5" single silencer side exit.
This without a cat could split walls never mind eardrums
the aftermarket concentrate on sound out the back, and tend to use larger bore pipe, smaller absorption type silencers, and can have poor fit too, all contributing to drone, even loading of the hangers affects it. Pipe sizing affects power as well as sound, and bigger is not always better, but I guess those that want to believe, will. I have one in the garage I fitted for a bit of an experiment, it was crazy! I had to try it haha, R53 with 2.5" single silencer side exit.
This without a cat could split walls never mind eardrums
Thanks for the insight, I will jack the car up & have a good look when I get back home in a fortnight.
I think there was a bit of tension on the centre rubbers & I may also have contributed in some way to this myself as due to the rear boxes each having just one (original type) rubber, I fitted an additional one to each side which is of the (pretty much) solid Heavy duty rubber type to give additional support, I will also try without those to see if that helps.
I think there was a bit of tension on the centre rubbers & I may also have contributed in some way to this myself as due to the rear boxes each having just one (original type) rubber, I fitted an additional one to each side which is of the (pretty much) solid Heavy duty rubber type to give additional support, I will also try without those to see if that helps.
CarsOrBikes said:
three things..........
the thousand miles is nonsense
check the exhaust where it runs over the centre brace isn't rammed against the bump stops especially top, if it is get it off there
fit a JCW catback, it sorts exhaust drone, period.
Due to the many opinions regarding which exhaust, if you want to contribute towards time spent I'll even attempt to prove it by fitting my own excellent condition original one piece full catback or my recent JCW system currently on my car, onto a vehicle owned by someone doubting it would work haha.
My exhaust is currently mated to an engine with circa 270chp, all Vibratechnics mounts, and this custom manifold under test, with straight decat pipe.
Drone free, no rear seats, just carpet covering the gap. There is noise, but it's due to semi helical final drive gears and the state of tune, 'not' drone ;O)
I think your harnesses are mounted far too low, you’d be better with a half cage or harness bar so they are mounted level with the slots in your seats.the thousand miles is nonsense
check the exhaust where it runs over the centre brace isn't rammed against the bump stops especially top, if it is get it off there
fit a JCW catback, it sorts exhaust drone, period.
Due to the many opinions regarding which exhaust, if you want to contribute towards time spent I'll even attempt to prove it by fitting my own excellent condition original one piece full catback or my recent JCW system currently on my car, onto a vehicle owned by someone doubting it would work haha.
My exhaust is currently mated to an engine with circa 270chp, all Vibratechnics mounts, and this custom manifold under test, with straight decat pipe.
Drone free, no rear seats, just carpet covering the gap. There is noise, but it's due to semi helical final drive gears and the state of tune, 'not' drone ;O)
CarsOrBikes said:
check the exhaust where it runs over the centre brace isn't rammed against the bump stops especially top, if it is get it off there
You, sir, are a hero, go to the top of the class.I jacked the car up, looked at the middle mount & you were 95% correct, the "rubber suspension" part was hard against the front of the metal braced surround. Enlarged the holes to allow the support to move a few mm & it has been transformed.
Take a packet of cheezy poofs for your advice sir!
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