Here you go. I decided to get this done while the turbo was sitting around waiting to go on. The problem was i couldent find anyone that offered this service, until i talked to O2induction.

If you are interested in getting this service done to your turbo.

http://www.o2induction.com






Modified by Turbo200 at 4:27 AM 6/24/2005


Modified by Turbo200 at 4:28 AM 6/24/2005

 

would you mind explaining to us stupid people,(just me)what the point is?

 

In theory this should extend the lower end of the compressor map. So it should give me more midrange hp and torque and more peak hp.

Its designed to help smaller engine run larger compressor wheels.


HKS does it on their t04z

GT30r different style

 

If the turbo doesn't surge without it, will a ported shroud help at all? It actually reduces the airflow capacity and of the wheel. Although it seems to widen the efficiency islands.

http://www.turbobygarrett.com/...d.gif

 

Ryan Woon from WOTM makes rings that you can insert in some anti surge turbos like the GT47's to make them a smooth inlet like a normal turbo, because apparently if the turbo doesn't surge at all they're seeing power losses from it. I think he picked up in the neighbourhood of 35 RWHP starting at 900 on his car when it had a T74 by eliminating the anti-surge and nothing else.

 

how about a technical reason of why it works.

 

My turbo has the antisurge inlet much like the garrett pictured above....I'm not a big fan because its not coooool

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RTErnie &raquo;</TD></TR><TR><TD CLASS="quote">My turbo has the antisurge inlet much like the garrett pictured above....I'm not a big fan because its not coooool </TD></TR></TABLE>

dont worry about it . i twill be soon !

{ Insert Bandwagon here}

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by project dc2 &raquo;</TD></TR><TR><TD CLASS="quote">how about a technical reason of why it works. </TD></TR></TABLE>

Technical shmechnical. It looks friggin cool, that's why it works...LOL.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kwuaymaikrup &raquo;</TD></TR><TR><TD CLASS="quote">

Technical shmechnical. It looks friggin cool, that's why it works...LOL. </TD></TR></TABLE>


whats that ? ssautochrome theory ? if it blings they will come ? ( ill start blinging my manifolds brb ! lol jk

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by project dc2 &raquo;</TD></TR><TR><TD CLASS="quote">


whats that ? ssautochrome theory ? if it blings they will come ? ( ill start blinging my manifolds brb ! lol jk </TD></TR></TABLE>

LOL...naw really, I would like to know technically why it works or what it does. I already have enough pimp juice anyways.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by www.turbobygarrett.com &raquo;</TD></TR><TR><TD CLASS="quote">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.</TD></TR></TABLE>

 

I did it for the simple fact that i will be running a 67mm comp. wheels on a 2.0l motor.

 

Holset has been using this technology for a long time. Probably a lot of information out there about how/why it works in you look into the Holset line.

 

The best reason- the GT30R sounds incredible with a ported shroud! I'm not sure how common surge is with the turbos that most Honda's run, but I can't hear any on my S2000.

Tim

 

How much was it to have it done?

Ian

 

Is there any real proof in a loss of power on hondas, if not I'd be interested in doing this also, so I am curious of how much you paid and the approxiamate turn around time.

 

The only negative thing i came across was someone one supraforums was saying they lost spoolup time. But he showed proof even when asked to. But if HKS and Garrett use this tech. on there turbos, i will too


The service is $200 it includes the ported shroud and polishing of the velocity stack (inside compressor inlet).

Contact Jon at O2induction,

SALES@O2INDUCTION.COM

He'll hook you up.

 

HKS and Garrett use this technology for when they're running turbos that are prone to surge. With how late boost comes on with the HO there is no compressor surge whatsoever, but having the ported shroud will make it spool later.

 

I'm running a T67 on a 2.0L and getting 20 PSI by 4800 RPM with no surge. There needs to be a better reason then "it sounds cool" for me to spend $200 on a compressor cover.

The only benefit I see is it LOOKS like it extended the width of the efficiency island on the compressor flow map I posted above. It's hard to tell if it lowered the peak efficiency though. Obviously some turbochargers need it to keep from surging. But the T67 doesn't seem to need it to prevent surge at all. Now if it fattened up the efficiency islands it MIGHT be worth the $200. I bet it still wouldn't make any more power while not maxing out the turbo and it would probably reduce the maximum power potential that it can make.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">I'm running a T67 on a 2.0L and getting 20 PSI by 4800 RPM with no surge. There needs to be a better reason then "it sounds cool" for me to spend $200 on a compressor cover.
The only benefit I see is it LOOKS like it extended the width of the efficiency island on the compressor flow map I posted above. It's hard to tell if it lowered the peak efficiency though.</TD></TR></TABLE>

whats the point if your not surging?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbo200 &raquo;</TD></TR><TR><TD CLASS="quote">In theory this should extend the lower end of the compressor map. So it should give me more midrange hp and torque and more peak hp.

Its designed to help smaller engine run larger compressor wheels.
</TD></TR></TABLE>

I thought it was the other way around. I thought that they used the ported shroud housing so you can run a smaller turbo that would normally surge in a certain area in the map, but now that its shrouded the surge limit is changed. Allowing you to run a smaller turbo with a larger motor, while still staying off of the surge limit.