Jump to content
SAU Community

Recommended Posts

Hi, i just wanted your opinions on how big of a exhaust is too big? I just put on a 3.5" (or maybe even 4"), havent measured it yet since i got it for free, anyway I feel that its abit loud, is there a way i can silence it without putting on a stockie or anyone have exhaust sizes this big?

what are your thoughts on them

thanks

Link to comment
https://www.sau.com.au/forums/topic/123124-exhaust/
Share on other sites

Generally a loud exhaust will be due to the exhaust itslef rather than its size. I had a 3" cat back that would drone terribly to the point were i would get headaches driving the car, but it was because it was simply a crap exhast the previous owner fitted. Got a new turbo back 3" which is much quieter, but still powerful and has a nice sound...

A friend has an r32 too with a 3.5" pipe and his is just as quiet as mine.

but maybe u could hotdog it, depends on how loud it is atm, cause a bit of a reduction in the noise mite not be enough.

Edited by r32line
Link to comment
https://www.sau.com.au/forums/topic/123124-exhaust/#findComment-2274576
Share on other sites

i just measured it and its 4.5"(the muffler) ;), the exhaust is 3inch all the way can i get some kind of silencer for this? there are two little holes towards the end of the muffler and someone told me this is to put a silencer, is this true?

I've only had it for a day and im finding its quite annoying on long drives, and generally would this be over 90db or watever they allow for?

Edited by shaun123
Link to comment
https://www.sau.com.au/forums/topic/123124-exhaust/#findComment-2275278
Share on other sites

i just measured it and its 4.5" ;) can i get some kind of silencer for this? there are two little holes towards the end of the exhaust and someone told me this is to put a silencer, is this true?

I've only had it for a day and im finding its quite annoying on long drives, and generally would this be over 90db or watever they allow for?

Yes the little holes are so you can bolt on a silencer and yes a large exhaust like yours would probably be over the 90db limit.

Link to comment
https://www.sau.com.au/forums/topic/123124-exhaust/#findComment-2275323
Share on other sites

i just measured it and its 4.5"(the muffler) :whistling:, the exhaust is 3inch all the way can i get some kind of silencer for this? there are two little holes towards the end of the muffler and someone told me this is to put a silencer, is this true?

I've only had it for a day and im finding its quite annoying on long drives, and generally would this be over 90db or watever they allow for?

Well i have the exact same setup, 3inch pipe with 4.5 inch tip and its not loud at all, you must just have a bad system. A silencer can be fitted but you will loose almost any power the exhaust was giving you

Link to comment
https://www.sau.com.au/forums/topic/123124-exhaust/#findComment-2276439
Share on other sites

Well i have the exact same setup, 3inch pipe with 4.5 inch tip and its not loud at all, you must just have a bad system. A silencer can be fitted but you will loose almost any power the exhaust was giving you

hmm same setup huh, is yours really quiet? do you have some kind of a sound file of your car running. Maybe cos my car is NA its loud?? or maybe im just exaggerating and its really not as loud :laugh:

Link to comment
https://www.sau.com.au/forums/topic/123124-exhaust/#findComment-2276579
Share on other sites

A N/A exhaust will, as a rule, be louder than a turbo exhaust.

As a guide my exhaust is 90mm & I literally cannot hear it over the tyre noise.

By the way, an exhuast is too big if you have to check for the cat sleeping in it before you start the car...

Edited by djr81
Link to comment
https://www.sau.com.au/forums/topic/123124-exhaust/#findComment-2276782
Share on other sites

A N/A exhaust will, as a rule, be quieter than a turbo exhaust.

As a guide my exhaust is 90mm & I literally cannot hear it over the tyre noise.

By the way, an exhuast is too big if you have to check for the cat sleeping in it before you start the car...

actually it's the other way around. in general (with aftermarket exhausts) NA cars are louder as there is no muffling bettwen the exhaust ports and the pipe/mufflers etc. but on a turbo car you have a turbine (or two) that muffles the sound.

Link to comment
https://www.sau.com.au/forums/topic/123124-exhaust/#findComment-2276790
Share on other sites

If you don't want to get a silencer, go to an exhaust shop and spend a little on a quiet muffler.

Exhaust size and even power has little to do with the noise. It's all in the muffler.

There's a reason my Suzuki Sierra is louder than my Skyline and exhaust size and power have nothing to do with it.

It's all in the muffler :laugh:

Link to comment
https://www.sau.com.au/forums/topic/123124-exhaust/#findComment-2277014
Share on other sites

My GTR came with a full 3.5inch system and 4.5inch straight thru cannon muffler that did nothing!!! You could hear the car comeing 3 miles away. It would of been close to 120Decibels!!! Before i got defected i decided i had to change mufflers, but i couldnt find a quiet internally 3.5inch muffler. So i had a custom 3inch straight thru sports muffler made up. Its about 3foot long and a foot and a half wide, its absolutley massive!!! I had it made with twin 2.5 inch tips so it looks stock from the oputside. It knocked 30decibels off the exhaust, and has made it far more liveable. On the down side it did cost me 4KW at the wheels, but its still worth it.

Link to comment
https://www.sau.com.au/forums/topic/123124-exhaust/#findComment-2277324
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Surely somebody has one in VIC. Have you asked at any shops?  Is this the yearly inspection or did you get a canary?
    • This is where I share pain with you, @Duncan. The move to change so many cooling system pieces to plastic is a killer! Plastic end tanks and a few plastic hose flanges on my car's fail after so little time.  Curious about the need for a bigger rad, is that just for long sessions in the summer or because the car generally needs more cooling?
    • So, that is it! It is a pretty expensive process with the ATF costing 50-100 per 5 litres, and a mechanic will probably charge plenty because they don't want to do it. Still, considering how dirty my fluid was at 120,000klm I think it would be worth doing more like every 80,000 to keep the trans happy, they are very expensive to replace. The job is not that hard if you have the specialist tools so you can save a bit of money and do it yourself!
    • OK, onto filling. So I don't really have any pics, but will describe the process as best I can. The USDM workshop manual also covers it from TM-285 onwards. First, make sure the drain plug (17mm) is snug. Not too tight yet because it is coming off again. Note it does have a copper washer that you could replace or anneal (heat up with a blow torch) to seal nicely. Remove the fill plug, which has an inhex (I think it was 6mm but didn't check). Then, screw in the fill fitting, making sure it has a suitable o-ring (mine came without but I think it is meant to be supplied). It is important that you only screw it in hand tight. I didn't get a good pic of it, but the fill plug leads to a tube about 70mm long inside the transmission. This sets the factory level for fluid in the trans (above the join line for the pan!) and will take about 3l to fill. You then need to connect your fluid pump to the fitting via a hose, and pump in whatever amount of fluid you removed (maybe 3 litres, in my case 7 litres). If you put in more than 3l, it will spill out when you remove the fitting, so do quickly and with a drain pan underneath. Once you have pumped in the required amount of clean ATF, you start the engine and run it for 3 minutes to let the fluid circulate. Don't run it longer and if possible check the fluid temp is under 40oC (Ecutek shows Auto Trans Fluid temp now, or you could use an infrared temp gun on the bottom of the pan). The manual stresses the bit about fluid temperature because it expands when hot an might result in an underfil. So from here, the factory manual says to do the "spill and fill" again, and I did. That is, put an oil pan under the drain plug and undo it with a 17mm spanner, then watch your expensive fluid fall back out again, you should get about 3 litres.  Then, put the drain plug back in, pump 3 litres back in through the fill plug with the fitting and pump, disconnect the fill fitting and replace the fill plug, start the car and run for another 3 minutes (making sure the temp is still under 40oC). The manual then asks for a 3rd "spill and fill" just like above. I also did that and so had put 13l in by now.  This time they want you to keep the engine running and run the transmission through R and D (I hope the wheels are still off the ground!) for a while, and allow the trans temp to get to 40oC, then engine off. Finally, back under the car and undo the fill plug to let the overfill drain out; it will stop running when fluid is at the top of the levelling tube. According to the factory, that is job done! Post that, I reconnected the fill fitting and pumped in an extra 0.5l. AMS says 1.5l overfill is safe, but I started with less to see how it goes, I will add another 1.0 litres later if I'm still not happy with the hot shifts.
    • OK, so regardless of whether you did Step 1 - Spill Step 2 - Trans pan removal Step 3 - TCM removal we are on to the clean and refill. First, have a good look at the oil pan. While you might see dirty oil and some carbony build up (I did), what you don't want to see is any metal particles on the magnets, or sparkles in the oil (thankfully not). Give it all a good clean, particularly the magnets, and put the new gasket on if you have one (or, just cross your fingers) Replacement of the Valve body (if you removed it) is the "reverse of assembly". Thread the electrical socket back up through the trans case, hold the valve body up and put in the bolts you removed, with the correct lengths in the correct locations Torque for the bolts in 8Nm only so I hope you have that torque wrench handy (it feels really loose). Plug the output speed sensor back in and clip the wiring into the 2 clips, replace the spring clip on the TCM socket and plug it back into the car loom. For the pan, the workshop manual states the following order: Again, the torque is 8Nm only.
×
×
  • Create New...