Race O2 Housing

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Nov 22, 2004 | 08:49 AM

#16

Noize

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From: Franklin, TN

Back from the dead!!!1! That reply made my head hurt in more ways than one.

Nov 22, 2004 | 09:25 AM

#17

Dyno4mance

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From: NW Georgia

I have seen no benefit to adding this 02 housing....in fact there is even a down side, the aftermarket 02's have got rid of the lower support bracket, this leaves all of the weight of the turbo suspended from the exhaust manifold....not a big deal with the stock cast item but when upgrading to a aftermarket tubular piece this may create issues with strength...
My 2c

Nov 22, 2004 | 09:45 AM

#18

cokofellah

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I agree...posted my concern about this "bolt" some time ago.
My aftermarket header (a JIC) had since cracked....it cracked at the base, where it connects to the turbo.
I don't know if my DNP O2 housing had anything to do with this. Just stating facts.

Also, header gasket recently got "wasted" (using the stock manifold)....and one bolt that connected my downpipe to the O2 housing disappeared....AND, two bolts that connected turbo to header manifold were really loose.....all after a day of hard driving at Thunderhill...

could've been just a case of bolts not being tightened properly...or too much heat.

anyway, with the cracked JIC header...I surely wish I knew the real cause. For now, I've just accepted that aftermarket headers do crack.

Nov 22, 2004 | 10:25 AM

#19

MalibuJack

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From: Royse City, TX

I suspect its a combination of all these things.. I made up some brackets to support the Turbo and whatnot but have not had the opportunity to "Test"..

The DNP housing itself's outlet is roughly the same size as stock so its a bolt-on replacement, I think its biggest asset is the smoothed surfaces and that its stainless, I don't know that it offers any real gains but a few HP can't hurt. Like I said earlier, it seems to me that the combination of components has more to do with the gains than just the housing..

Nov 23, 2004 | 02:47 PM

#20

Aby@MIL.SPEC

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From: San Elijo Hills, Ca.

Quote:

Originally Posted by Ron

Ideally, you separate the two flow paths coming out of the turbo's turbine housing (the flow exiting the turbine itself, and the flow from the wastegate port) as much as possible. The stock O2 housing looks pretty decent at doing this, for a stock piece.

The Vishnu turbo-back exhaust (the one that removes the factory O2 housing completely) looks like it keeps the two flows separated for a longer distance than any O2 housing, stock or aftermarket, could.

The power benefits of this probably become even more apparent at elevated boost levels when you're shoving a whole lot of flow through both orifices (heh heh). Most likely it improves boost controllability/stability too... Shiv might comment? Sorry for the threadjack.

How much air can actually be passing through the wastegate @ full boost during WOT conditions? If these 16g turbo's are maxed out, how much can be flowing out the w/g?

I would imagine that a reduction in backpressure is achieved by increasing the point where the o2 housing connects to the dp.

fyi, the megan racing o2 housing has a 70mm outlet ~2.75" while the dnp has a 2.5" outlet diameter. The vishnu unit is 3" to my knowledge straight out of the turbo