anyone?

 

I like this one.

http://www.spacerat.net/Dori/Mattsdynopulls.wmv

Sorry, the link is dead. I have the vid if someone will host it.

 

Yo Rich! Get on aim, I'll send you a few of mine.

 

hey eric . I won't be able to get on aim until about 11pm tonight

 

They should be on Streetfire in the BOV and whistle tip noise section

 

Wait? Vented or Non-Vented. Give me a call and I can whistle it for you. I have a vented housing and it sounds like a diesel even in vacuum. Seems to build boost a little quicker too.

 

Rich, all of the vids of Eric Cheatham's car is the anti-surge housing that you hear whistling really loud when he is on the gas. I think dhalen's dyno vid was that way also.The both run t51R turbo's, and they have the anti-surege compressor housing. I have a GT40R with it, but no vids yet. I'll try to make some very soon and post it up.

Dee

 

Go into traffic and listen to any 18 wheeler or dump truck go by.

 

I have a h front cover on my turbo. I think it sounds 10x times faster than it is. I guess both covers have there + and minuses. Good thing is they can be swapped in 3 minutes.

 

Lets see pics and videos people.

 

that's funny chris, don't you have one of those ghey housings on your 50 pound turbo

 

someone is itching to take their car apart

 

Ah, you think you have it all figured out, don'tcha carson

 

YUP! just finished another cover this morning, for a DSM guy, they seem to like the sound.

 

Why do they whistle more then then a non-surge housing? And I haven't had any luck myself finding any sound clips.

 

i remember a vid of a bridgeported fd w/ hks turbo and i think it had the anti-surge. this was probably 3 years ago. one of the guys in japan. dont remember who, think it was one of soul assassins buddies

 

ported shrouds on a rotary is nothing more then a freakin noise maker at the expense of spool up and effieciency. Why would anyone choose to spool slower and make slightly less power to have something that sounds cool? The ported shroud was designed to buffer surge. Not the kind of surge from throttles slamming shut, but the kinda surge when your turbo is pushing more air then your engine is willing to ingest. It adds to the left side of a compressor map (surge line) and slightly hurts every were else. They also tend to spool slower. They were primarily designed for large deisel engines were the turbo is spooled up but pushing more air then the deisel engine is willing to ingest till the RPM's climb high enough to fall back on the map islands (away from surge line). Our cars will never spool up these mid/large sized single turbos fast enough to be in surge EVER (perhaps running to small twins, then yes a ported shroud might be benefitual). So go out and buy your noise makers (although I admit it sounds cool, I just can't justify having later spool and less effiency for noise no matter how small of a diference). HKS makes their ported shrouds so the effiency lose is minimal due to still having a smooth bell mouth rather then the ugly stepped inlet, and yes you still get the "sound". Those who don't know the sound everyone is talking about, just sit in traffic and listen to any large deisel truck/18 wheeler/large dump truck. Its the slight whistle noise during spool up.

Do a search, I and a few others have covered this housing style numerous times and i even give pics of what the difference is and how it functions.

~Mike...........

 

For those too lazy to search, or those neh-sayers.

Straight from Garrett:

A Ported Shroud compressor (see Fig. 2) is a feature that is incorporated into the compressor housing. It functions to move the surge line further to the left (see Fig. 3) by allowing some airflow to exit the wheel through the port to keep surge from occurring. This provides additional useable range and allows a larger compressor to be used for higher flow requirements without risking running the compressor into a dangerous surge condition. The presence of the ported shroud usually has a minor negative impact on compressor efficiency.

~Mike..........

 

Thanks for all the info Mike. Based on that comment on the garrett website, I opted against the anti surge comp housing when ordering my turbo about 6 weeks ago. Looks like I made the correct decision

 

If you cant beatem, maybe you can scarem, with the sound!! you know part of driving these RX-7s is the fun of it.

 

So are you finally going single or are you going with a crazy one off twin set up?

R.K.

 

A nice streetable single setup, mainly b/c I want the option to run higher boost/race gas.

 

So you finally saw the light (lol).


R.K.

 

I wouldnt say that. I spent an assload on my single setup---the BNRs run sequential are by far the best bang for the buck pump gas setup with a nice 3k-8k powerband. Unfortunately, mine are set up non-seq. Plus, it was time for a change.....I've been running BNRs of some form or fashion (different iterations) for since 2002!

 

So what did you go with for the single? That new GT4094R?