89 Rag

Most people will tell you to stay away from grinding on them, they are hard as hell, and trying to grind them out almost always causes damage to the housing in the process.

Mr. Midas

[quote name='89 Rag' date='Aug 26 2005, 06:53 PM']Most people will tell you to stay away from grinding on them, they are hard as hell, and trying to grind them out almost always causes damage to the housing in the process.


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I definitely don't want to damage my housings. I was hoping ther was a special grinding bit or something to get the difusers out easier. I remember reading in one of Aroncake's threads were he seemed to grind them out fairly easily.



Looks like I'll be posting on the For sale/Wanted section for some sleeves and factory tranny mounts as well. (Yes, I am a tranny swapping purist. i.e. ripp out interior, weld in stock mounts... )





As a last resort, I'll take them out and then grind away the difusers with whatever works.



I would still like to see/here of any performance increases that others have experianced from removing them, and also the best method to keep the noise down (96db).



So stop passing this thread by, whoever-you-are, and help a worried rotary noob out!

FikseRxSeven

if you want to keep the noise down, and also want to get rid of the diffusers.. you might want to get a resonator or presilencer like kahren said in a previous post.

Mr. Midas

[quote name='FikseRxSeven' date='Aug 27 2005, 08:52 PM']if you want to keep the noise down, and also want to get rid of the diffusers.. you might want to get a resonator or presilencer like kahren said in a previous post.


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I plan on doing something like that, but I was hoping some people had specific recomendations for the best setup. I'll do some searching on the subject of exhaust tuning and setup and see what I can find. I really don't know much about the usage of cats, silencers, and resonators in tuning the exhaust. i.e. How big, how long, how many, which is first, which is last... and so on.



Like I said before, I am a definite noob in this area.

j9fd3s

our ITS car passes sound with this setup:



stock port 6 port engine, with turbo housings.



custom header into 3" piping



rb turbo back pre silencer http://www.racingbeat.com/resultset....tNumber=16425P



and a magnaflow muffler



setup is actually really quiet (on the track) and sounds like a denist drill at 9000rpms

Mr. Midas

That's an awsome sound when you know the engine can handle it.

Sometimes I can't resist reving my little die grinder like an F1 racer. It gives me a glimps of the light at the end of the tunnel, so to speak.

My car and motor have been sitting in the garage for almost 2 YEARS!!!



Your setup is impressive. What is the sound limit you have to adhere to?



Youv'e got me thinking now...

I like the look of Rx7.com's streetable header. It has fairly even runers and the O2 sensor is where it should be. http://www.rx7.com/store/rx7/fcexhaust.html



I hope putting a dual canister catback sys will muffel it enough. I really don't want to draw too much attention while dding, and I just think being loud is dumb.

Unless your'e on the race track of course.





Thanks Guys!

C. Ludwig

[quote name='j9fd3s' date='Aug 28 2005, 11:17 PM']our ITS car passes sound with this setup:



stock port 6 port engine, with turbo housings.



custom header into 3" piping



rb turbo back pre silencer http://www.racingbeat.com/resultset....tNumber=16425P



and a magnaflow muffler



setup is actually really quiet (on the track) and sounds like a denist drill at 9000rpms


[/quote]





Of course you realize the engine is illegal with turbo housings?

ColinRX7

Why would it be, the housings are the same essentially.. There is no advantage to swapping TII housings over N/A housings with TII sleeves..



Only specific casting difference is the coolant passage at the peripheral intake area..

C. Ludwig

Because it's a turbo engine part that was not available on the NA. Would be like using RX-8 rotors. There is also the possibility that the diffuser inhibits flow giving the illegal turbo housing a flow advantage. This one has been through the tech shed before. This engine is not legal for SCCA's ITS class.

Mr. Midas

[quote name='C. Ludwig' date='Aug 29 2005, 10:44 PM']Because it's a turbo engine part that was not available on the NA. Would be like using RX-8 rotors. There is also the possibility that the diffuser inhibits flow giving the illegal turbo housing a flow advantage. This one has been through the tech shed before. This engine is not legal for SCCA's ITS class.


[/quote]







I don't know the racing class rules, but that sounds weird. Would the only "legal" way be to grind the N/A diffusers out? I would think the housings are equivalent to a piston engine's cylinders, which are the same between N/A's and turbo's, right?



Ahhh, the joys of all the rules against the rotary engine...



Why don't they just ban the rotary completely? ...Like they did in the 24 Hours of Le mans... Punny piston lovers!