Can some one tell me the difference with T04E and the T04S option for Precision SC61? Power? Efficiency?

 

E cover has a 3" inlet. S cover has 4" inlet and cost 100 more. They say 10% increase in power with the S cover. Search for sc61 and you'll see alot of dyno numbers.

 

E = AR.60
S = AR.70

 

The E can support more boost, the S is "supposed" to make more power. We havn't really seen any gains w/ the S housing and the we have seen nothing but good results w/ the E.

 

Can I still make the same power at the same boost with the 'E' option?

 

It seems as though the S housing has turned into the bastard step child lately now that everyone and their mother is running the SC61 w/ E housing. I wish someone could really test the two of them so we could see lag and power differences. Maybe I'll buy it just so we can do it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AVATAR &raquo;</TD></TR><TR><TD CLASS="quote">It seems as though the S housing has turned into the bastard step child lately now that everyone and their mother is running the SC61 w/ E housing. I wish someone could really test the two of them so we could see lag and power differences. Maybe I'll buy it just so we can do it. </TD></TR></TABLE>

It does make the turbo seem "bigger"...

I can't remember who it was (tony1, boostedhybrid,...??) but they have also said that the HP difference between the housings is miniscule at best.

I would assume however, that the S housing is less restrictive on the large GT wheel at very high boost (25+) compared to the E housing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AVATAR &raquo;</TD></TR><TR><TD CLASS="quote">It seems as though the S housing has turned into the bastard step child lately now that everyone and their mother is running the SC61 w/ E housing. I wish someone could really test the two of them so we could see lag and power differences. Maybe I'll buy it just so we can do it. </TD></TR></TABLE>

people already tested them and the S made no extra power....stick with the E

 

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

people already tested them and the S made no extra power....stick with the E </TD></TR></TABLE>

What about on a 6 cylinder? VR6?

 

according to Rod ,

the S housing should gives another 15hp

 

Lemme ramble a little bit about A/R of a housing.

The AR is a measurement of the Area(the tube inside the housing) divided by the Radius(distance from center of tube to the turbine shaft). Basically A/R tells u the size and shape of the housing and how restrictive it will be against flow. Its easy to understand how that works on the exhaust side; a smaller A/R will spool faster but it will flow less air. The compressor side is basically the same; except now you want to compress the air. We all know what pressure is right? Resistance to flow. what does a smaller a/r do? Restricts flow. The smaller A/R on the compresssor housing will create boost pressure w/ less compressor wheel speeds then the larger A/R. However, a larger A/R will flow a larger volume of air at the same boost pressure.

Choosing the right housing really comes down to the compressor wheels efficiency range. Think of a compressor map for a specific wheel, notice at a specific boost pressure how many lb/min the wheel flows. Now look where the efficiency island sits. The different A/R housings are basically going to move that island left/right/up/down for a specific wheel. The S housing will basically move the efficiency island down/right and the E housing moves it left/up.

What does all this mean? its a bunch of technical bable that really doesn't matter. The E housing works great and until we do a back to back comparison of the E vs. S its purely opinion on which one makes more power for our applications.

I think one reason alot of people think the S automatically makes more power is because on the 60-1 turbo it does. With the 60-1 compressor wheel the S housing just happens to be the right combination. I am not so sure yet about the SC61.

 

if garret outfits the turbo's with S housing's thats gotta mean something
or it could be to just drive the price up by $100

 

hehe your probably right.

and for GOLDBERG - show me the dynos . . . I've never seen any any.
I remember tony1 tested the SC61 VS the SC63, but if I remember right the 61 hade the S housing and the 63 had the E housing. The 63 yeilded very little power gains when compared. I'm not trying to spread heresay so I'll try to find the post.