atmospheric dump on o2 housing

[madscientist323]

i saw one on ebay what benefits does this have

 

[JwUoNoG]

I would say something. but the rules don't allow it.

An atmosphere dump will help exhaust gases get out of the car faster. Maybe a little more top end, i'm not positive.

It sounds awesome too.

 

[99gst_racer]

Sometimes it can help supress boost creep a little bit. It will not fully fix it though. Many people say it also allows for quicker spool up. It is also ver, very loud at WOT. Sounds very unique. Don't buy it expecting to add 20 HP or gain 2 tenths.....

 

[Coup D E'Tat]

Sometimes it can help supress boost creep a little bit. It will not fully fix it though. Many people say it also allows for quicker spool up. It is also ver, very loud at WOT. Sounds very unique. Don't buy it expecting to add 20 HP or gain 2 tenths.....

In my experiences, it eliminated it.

 

[Shadowfax]

my experience O2 dumps took off .5 and gained 4mph - course that was with two on stock 3/S turbos in a 4000lb AWD 3000GT VR4 - at wastegate boost too

The O2 dump should pick up some HP - specially if your exhaust is only 2.5"

Consider it- you've got enough air running thru the turbo to maintain power- but you're bypassing the turbine once the wastegate opens - so if you are just running 15psi on even a 14B, the wastegate will open and you'll be dumping that air into the exhaust after the turbo- any time you decrease the pressure on the outlet of the turbine, you're going to get more efficient flow thru it- thus by taking the wastegate air out of the equation- you'll find HP.

If you are putting an O2 dump on a T25 run at 17psi- your wastegate won't open, and you'll gain NOTHING.

If you have 3" exhaust, and a smaller turbo, you might not get much gain- the exhaust was pretty unrestricted anyway.

Long and short- if running 2.5" exhaust- expect. If running 3" with small turbo- don't.

 

[99gst_racer]

my experience O2 dumps took off .5 and gained 4mph - course that was with two on stock 3/S turbos in a 4000lb AWD 3000GT VR4 - at wastegate boost too

Yeah, I have yet to see a DSM consistently knock off a half second from their 1/4 ET's from only O2 dumping....... But I'm glad it worked on you 3Kgt.

 

[David15151]

yeah but are we comparing 02 dump vs stock piece or 02 dump vs aftermarket eliminator.. you see what im saying?

 

[99gst_racer]

yeah but are we comparing 02 dump vs stock piece or 02 dump vs aftermarket eliminator.. you see what im saying?

We are comparing a O2 dump housing to a factory OEM cast O2 housing.....

 

[David15151]

in that case yes dump is good to have.

 

[Shadowfax]

Yeah, I have yet to see a DSM consistently knock off a half second from their 1/4 ET's from only O2 dumping....... But I'm glad it worked on you 3Kgt.

Oh, no doubt there! I figure if you've got a 14B and are pushing 17psi then you should see some sort of gains from an O2 with a 2.5" exhaust- on 3" exhaust, I'm hoping you would (find out soon )

On the 3/S- the TD04 is tiny, and the exhaust is 2.5" into 3"- so really, it can use all the help it can get!

 

[madscientist323]

ok guys thanks for the help how is it intsalled im new here so go easy

 

[Shadowfax]

if you take the stock one off, the new one goes on exactly the same.

 

[ICE_T]

my experience O2 dumps took off .5 and gained 4mph - course that was with two on stock 3/S turbos in a 4000lb AWD 3000GT VR4 - at wastegate boost too

The O2 dump should pick up some HP - specially if your exhaust is only 2.5"

Consider it- you've got enough air running thru the turbo to maintain power- but you're bypassing the turbine once the wastegate opens - so if you are just running 15psi on even a 14B, the wastegate will open and you'll be dumping that air into the exhaust after the turbo- any time you decrease the pressure on the outlet of the turbine, you're going to get more efficient flow thru it- thus by taking the wastegate air out of the equation- you'll find HP.

If you are putting an O2 dump on a T25 run at 17psi- your wastegate won't open, and you'll gain NOTHING.

If you have 3" exhaust, and a smaller turbo, you might not get much gain- the exhaust was pretty unrestricted anyway.

Long and short- if running 2.5" exhaust- expect. If running 3" with small turbo- don't.

with a 16g evo3 and 2.5 exaust ,.

it's good enought a dump O2

 

[ikickuintheball]

my experience O2 dumps took off .5 and gained 4mph - course that was with two on stock 3/S turbos in a 4000lb AWD 3000GT VR4 - at wastegate boost too

I saw similar gains in power at the track with my stock exhaust. I lost another .3 and added 2-3mph after adding a 3" exhaust. All this with a stock t25 boosting 17psi.

This isn't just for extra noise or preventing creep (which it didn't help too much with on my small 16g). It helped add a lot of power on my car, and on the car it was on before mine. I never asked the next owner how it was for him though. It's a great (relatively) cheap mod for what you get from it when you have a small enough setup for an internal wastegate. I'll be running an external once my 50-trim gets here (sigh).

BTW, you're retarded if you think the wg doesn't open if you run 17psi with an 8psi (or so) wastegate. .

 

[madscientist323]

if you take the stock one off, the new one goes on exactly the same.

theres no extra tubes pipes or anything?just unbolt stock and put the new one in its place does the o2 sensor still thread in?

 

[dave99gst]

theres no extra tubes pipes or anything?just unbolt stock and put the new one in its place does the o2 sensor still thread in?

it should - but this is a ebay product were talking about.

 

[Shadowfax]

).

BTW, you're retarded if you think the wg doesn't open if you run 17psi with an 8psi (or so) wastegate. .

typically I'm used to the 3/S world- I'm rather a newbie in the DSM world (though I've been paying attention) - in the 3/S world- the 9b is like the T25- it can't keep up with demands. hence running it at 15psi yields a brief spike, then ever decreasing boost- and the dumps confirmed that the wastegates never opened

If the T25 acts differently, then my apologies

 

[ikickuintheball]

typically I'm used to the 3/S world- I'm rather a newbie in the DSM world (though I've been paying attention) - in the 3/S world- the 9b is like the T25- it can't keep up with demands. hence running it at 15psi yields a brief spike, then ever decreasing boost- and the dumps confirmed that the wastegates never opened

If the T25 acts differently, then my apologies

I apoligize for being a dick about it. When I ran the dump on my t25, I could run 20psi (brief spike going down to 15psi) and I would hear the dump the whole way.

 

[Shadowfax]

That sucks! So has anyone run higher tension wastegate can on the T25 with a dump to see if it helps? Guess this is moving off topic
So... err... I'm done

 

[talon96tsi]

would running an o2 dump with a 14b at 14psi be worth it, along with my 3" br turbo back...im trying to eliminate my boost creep, which is to say the least incrdeibly annoying. Along with porting the *#$% out of my turbine housing im trying to find way to make it go bye bye

 

[Coup D E'Tat]

would running an o2 dump with a 14b at 14psi be worth it, along with my 3" br turbo back...im trying to eliminate my boost creep, which is to say the least incrdeibly annoying. Along with porting the *#$% out of my turbine housing im trying to find way to make it go bye bye

A dump elminated creep on my 14b/3" exhaust without porting, boost at 12-ish PSI

 

[talon96tsi]

excelent!

by the way, the only o2 dump ive seen on ebay was either someting somebody made out of the stocker, or the punishment racing unit.

 

[starr]

jayson at just-performance.com (in oklahoma) makes an o2dump housing for our cars.

 

[99gst_racer]

A dump elminated creep on my 14b/3" exhaust without porting, boost at 12-ish PSI

When you were creeping, what was your boost set at and what were you creeping to?

 

[David15151]

boost creep differs from car to car. Sometimes a 02 can help and sometimes it takes it away BUT the ONLY true way to eliminate boost creep for sure is an external wastegate period. Personally.. I just think the 02 dump is just a noise maker but I do consider it much better than a stock unit as far as exhuast flow.. my aftermarket piece just recirculates so i dont get all that noise.