Jump to content
SAU Community

Need To Drop Decibels! Exhaust Question

FLUID

By FLUID,
in General Maintenance

 Share

Recommended Posts

FLUID Enthusiast

FLUID

Posted
Posted

Hey, I've got a r33 na with an x-force cannon (4 1/2 inch) and want to get it quieter with less vibration that hurts your head after a while. I've installed the silencer and that's done alot but want to hear any ideas of fiberglass, cotton etc inside the cannon to get some quietness. Thanks

scotty nm35 Grand Master

scotty nm35

Posted
Posted

A Varex muffler would help, they are one of the best sound deadening mufflers I have found so far, and then you can close the flap to silence them if you need to. My 3.5 inch one doesn't drone much at all.

cherring Proficient

cherring

Posted
Posted

A Varex muffler would help, they are one of the best sound deadening mufflers I have found so far, and then you can close the flap to silence them if you need to. My 3.5 inch one doesn't drone much at all.

How did you set up the boost actuated Varex???

scotty nm35 Grand Master

scotty nm35

Posted
Posted

Does anyone in here have a car that can't be defected? At the end of the day the goal is to not be pulled over, the impression of a stock car is the key imo.

Unfortunately there are no aftermarket mufflers I can recommend to reduce noise to a legal level other than the closed Varex. Other than that you would be best off finding a S/H jap cat back with a Jasma label.

I have gone back to the Varex motor on mine as the varex valve was too tight and kept jamming. There are other options I am trying at the moment.

post-63525-0-09171300-1342655810_thumb.jpg

cherring Proficient

cherring

Posted
Posted

Does anyone in here have a car that can't be defected? At the end of the day the goal is to not be pulled over, the impression of a stock car is the key imo.

Unfortunately there are no aftermarket mufflers I can recommend to reduce noise to a legal level other than the closed Varex. Other than that you would be best off finding a S/H jap cat back with a Jasma label.

I have gone back to the Varex motor on mine as the varex valve was too tight and kept jamming. There are other options I am trying at the moment.

Exactly, I think even my FMIC can defected can't it, just don't fail the dick head test if you do get pulled over.

The boost controlled varex looks interesting, shame it didn't quite work, and am interesting in hearing what you come up with.

mad082 Grand Master

mad082

Posted
Posted

Does anyone in here have a car that can't be defected? At the end of the day the goal is to not be pulled over, the impression of a stock car is the key imo.

Unfortunately there are no aftermarket mufflers I can recommend to reduce noise to a legal level other than the closed Varex. Other than that you would be best off finding a S/H jap cat back with a Jasma label.

I have gone back to the Varex motor on mine as the varex valve was too tight and kept jamming. There are other options I am trying at the moment.

there are plenty. any exhaust shop could sell you about 10 different ones that would, but few people would want them on their imports as a: they aren't fully hektic cannons, and b: they aren't a straight through type (so don't flow as well). but even a decent flowing muffler used with a decent centre muffler will give you exhaust levels below the legal limit. a non performance orientated muffler will be built in the same way as a stock one and give the same level of noise attenuation

scotty nm35 Grand Master

scotty nm35

Posted
Posted

but even a decent flowing muffler used with a decent centre muffler will give you exhaust levels below the legal limit. a non performance orientated muffler will be built in the same way as a stock one and give the same level of noise attenuation

With a 3.5 inch system? You have to be kidding... Most of my customers want 300kw at least these days, with two free flowing mufflers. There aren't many on the market that cater for low noise along with the flow, especially in stainless.

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • MBS206
      Mistakes were made, my R34 Story

      By MBS206 · Posted

      The oil pressure sensor for logging, does it happen to be the one that was slowly breaking out of the oil block? If it is,I would be ignoring your logs. You had a leak at the sensor which would mean it can't read accurately. It's a small hole at the sensor, and you had a small hole just before it, meaning you could have lost significant pressure reading.   As for brakes, if it's just fluid getting old, you won't necessarily end up with air sitting in the line. Bleed a shit tonne of fluid through so you effectively replace it and go again. Oh and, pay close attention to the pressure gauge while on track!
    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      I don't know it is due to that. It could just be due to load on track being more than a dyno. But it would be nice to rule it out. We're talking a fraction of a second of pulling ~1 degree of timing. So it's not a lot, but I'd rather it be 0... Thicker oil isn't really a "bandaid" if it's oil that is going to run at 125C, is it? It will be thicker at 100 and thus at 125, where the 40 weight may not be as thick as one may like for that use. I already have a big pump that has been ported. They (They in this instance being the guy that built my heads) port them so they flow more at lower RPM but have a bypass spring that I believe is ~70psi. I have seen 70psi of oil pressure up top in the past, before I knew I had this leak. I have a 25 row oil cooler that takes up all the space in the driver side guard. It is interesting that GM themselves recommend 0-30 oil for their Vette applications. Unless you take it to the track where the official word is to put 20-50w oil in there, then take that back out after your track day is done and return to 0-30.
    • PranK
      My new to me M35 Stagea wagon

      By PranK · Posted

      Nice, looks great. Nice work getting the factory parts also. Never know when you'll need them.
    • Chupapy
      New r33 owner

      By Chupapy · Posted

      Thanks @jtha7 I will have a look around tomorrow but it is a prick of a spot. These are some photos i tried taking 
    • GTSBoy
      Mistakes were made, my R34 Story

      By GTSBoy · Posted

      I take it that the knock retard is from bearings tapping a little tune? Thicker oil is a fragile bandaid. You need a much bigger oil cooler and probably the bigger pump being discussed.
×
×
  • Create New...