I'm thinking of doing this, but wanted to know what other's experiences have been after swapping them or grinding the diffusers out.



Did it affect low-end torque, fuel economy, noise output, ect...?



I've heard of a few reasons Mazda put the difusers in.

Are they for keeping proper backpressure(sounds stupid to me), reducing noise(I thought they made silencers and muflers for that), and/or to disrupt exhaust pulses going from one port to the other(maybe they thought to hard on that one)?





Thanks,



New

 

Hasn't anyone swapped out the turbo sleeves or ground out the difusers?

 

if memory serves correct, it's just to reduce noise.

it would make sense, since there's no turbo to dampen the noise

 

[quote name='Old Splatterhand' date='Aug 25 2005, 12:12 AM']if memory serves correct, it's just to reduce noise.

it would make sense, since there's no turbo to dampen the noise


[/quote]





I am planning to go with a presilencer of some kind and a nice big cat to help keep the noise down.

I would really like to know what others have experianced and done to keep the extra noise down before I start grinding or swapping the sleeves...

 

I do it on every n/a motor I build. Whatever the reason for the sleeves, be it noise reduction, they are an exhaust restriction. I can't tell you an increase in db, because every car I have done has had a complete different setup, and you can never get any two cars the same.

 

how are NA rotor housings different from turbo rotor housings... aside from the diffusers in the sleeves?

 

No coolant passage for the lim.

 

the noise tone changes, and it might sound a bit more annoying to some, but its nto a major diffrence, atlest nothing that cant be fixed with an extra presilencer. most peopel run loud exhaust on their cars anway so i dont see this bothing people. unless they were very concerned with the noise in teh first place.

 

[quote name='kahren' date='Aug 26 2005, 12:48 PM']the noise tone changes, and it might sound a bit more annoying to some, but its nto a major diffrence, atlest nothing that cant be fixed with an extra presilencer. most peopel run loud exhaust on their cars anway so i dont see this bothing people. unless they were very concerned with the noise in teh first place.


[/quote]





Yeah. I'm a little concerned about the noise. If I want to autocross in the Atlanta region I need to keep the noise below 96db.

Someone was going to give me the turbo sleeves, but I guess they forgot about me.

Oh well.



What's everyone's favorite way of grinding out the difusers?

 

[quote name='Newguy707' date='Aug 26 2005, 07:56 PM']

What's everyone's favorite way of grinding out the difusers?


[/quote]



in my opinion that should be the last resort, try to get the turbo sleeves.

atleast thats my favorite way of grinding them, to answer your quastion.