Wastegate chatter/flutter what ever you wanna call it.
Which is the best type of air filter to get the loudest noise ?
Im after some filters for the rex and ive been offered a pair of mushroom shape foam gready jobies and dont know if there up to the job as all the cossys ive seen with loud chatter run k&n paper type filters
Will the rex be loud enough with foam ?


Cheers

 

Foam are shite IMO.

Defo K&N or Apexi.

By the way, most people refer to it as 'Turbo Chatter'. It definately ISN'T Compressor Surge, this is a VERY different (and very serious) thing!!

 

Its COMPRESSOR STALL


Which is actually part of what happens during compressor surge.

 

is chatter a good thing if its loud? mine is really loud these days on my S2

 

Not on mfi mate, we found this out on a mates s2 metering head was flucked

 

Yes, Chip, it is a by-product of Compressor surge, but I still don't see that the 2 are related.

They are both caused by air backing up onto the Compressor Blades. In the case of what I refer to as Turbo Chatter, the cause of the 'back-up' is the Throttle slamming shut, whereas with Compressor Surge it is a restriction in the system causing the air entering the engine to exceed the air that can get out of the engine.

Anyway, less of the physics and back on topic!!

 

oooh bollox

 

Oh well, get one from Ford, they are only about Ł1700!!

 

Check all your vac hoses first though

 

C+B, when you get surge, it causes compressor stall.

Then the surge goes, then the turbo starts to accelerate again, then it sruges, and then stalls.

i think we both are saying the same thing in a slightly different way?




anyway, back on topic..........



ANY turbostall is potentially bad for the turbo, it puts a lot of side loading on the shaft when it happens, which ends up at the bearings, some turbos (t3) are over engineered enough in this department for that not to really matter others (gt35r) arent.

 

hmmm Ł1700 nice and cheap then.

yeh i will defo be checking everything b4 i purchase one of them.

 

so not a good idea on an rx7 with little baby turbos ?

 

Re: RX7

At a guess, probably not, mots standard jap turbos dont like it.

Its not the size of the turbo that matters though, its the speed the internals spi, versus the weight of the blades etc, versus the size of the shaft.

Ie a T3 is fine and a larger GT35R isnt.

 

I've done 23,000 miles in my car with no dump valve fitted Thats with the original turbo too, its done 129,000 miles now and is just starting to show signs of wearing out

 

And the question is does it chatter like a coont ?

 

almost every RX7 ive been in chatters a lot.

they come with recirc DVs as standard anyhow.

but still chatter with cone filters fitted.

its not a problem.

the same stuff happens, just can hear it with the filters on.

 

Yours has a garett T series turbo, which shares a sophistication level on a par of that of fiesta turbos, not skylines, its hardly a typical jap motor

 

piper cross foam filters deliver a good amount of niose.
ive been told the HKS mushroom filters are pretty good to.

 

Its just a shame that they don't actually filter very much. I would NEVER use one.

 

What about the gready mushrooms ?

 

imo foam is crap but had one on my t3 conversion fiesta; and chatter was still loud!!