to dump or not to dump?

[Rob]

umm maybe that why its not fiting you still have the T25
I have the Agp T28 on mine maybe the angel of the turbo houseing is messsing up your lower angle of the Downpipe

 

[-=TWITCH=-]

I dont think that has anything to do with it. The turbos are the same size just the internals are diffrent!

TWITCH

 

[AgentPussfinder]

the reason im telling you not to or anyone no to dump with a T-25 is beacause it will make the boost fall of WAYYY faster than it does with the stock housing. trust me. I had it on for 4 days and i couldn't live with the decrease in what top end i had. it bolted up just fine but that is VP quality.

 

[-=TWITCH=-]

Im getting a big t-28 killer in the future Im not worried about drop off witht he crap t-25

TWITCH

 

[bigpoppa4674]

how can boost fall off faster do you lose top end speed? or top end power? please explain? I am planning on doing the dump mod on a friends car with a t-25. What will he gain and what will he lose? good info before i do this?

 

[2GeNTSi]

I believe they're saying don't dump on a T25 because you will lose boost faster then you already do in higher rpms. It's very noticeable on my car, at WOT I hit max boost up until about 4.5-5k and then you notice it stop to pull as much. And I'm guessing if you dump on your stock turbo, it will be even more dramatic.

 

[-=TWITCH=-]

Wow this thread is back from the dead! Just wanted to let eveyone know that I went with the VP o2 dump a while back. Just let me say if the noise wont bother you DO IT. Even on the T-25 it made a huge diffrence in power.

Chris R

 

[Rob]

hell ya back in black baby

 

[Agent Ezzard]

Yeah I sold TWITCH the dump. I told him not to dump with the T25 but he did it anyway. He says he likes the noise and he felt power. If you have one and are going to install it yourself then by all means go ahead. If you don't like it, remove it until you upgrade your turbo. If you have a VP O2 dump then don't sell it, keep it! I was lucky enough to have two.

 

[BoostedAWD91]

if u are running a external wastegate mounted on the manifold, the port out of the turbo where the dump would be coming out of would be welded shut so its not really going to do u any good to get a external dump, just put a dump off the wastegate and it will be plenty loud enough

 

[MaineDSM]

Listen to Twitch, folks. The *only* possible effect the external dump can have on performance is a *positive* one. Those who are suggesting it can hurt the top end are simply wrong.

The external dump relieves any backpressure on the wastegate, allowing everything to flow better. It may not make a big difference on a T25 with a free-flow exhaust, but it definitely won't make a negative one.

If you can stand the noise... a external dump is a good thing in every case.

 

[SpoOLxExO]

except for, of course....

THE HORRIBLE NOISE !

W/G dumps are dirty, noisy, and plain uncool. The sound of the turbo spooling is killed by a 1" piece of pipe emitting raw, loud exhaust.

Kinda like the sound one makes when checking their breath...HHHAAAAAAA *sniff.

Besides routing back in is clean, good looking, and won't interrupt the sweet sweet noise of a turbo getting up to speed.

 

[Kapok6]

if you like loud then yeah I suggest the o2 dump tube. It should eliminate boost creep and it sounds really "vengeful" when you open it up

I have a stainless steel o2 sensor housing w/ dump tube and not a lot of people here in Columbus have one, so when I roll up beside people and go wot and open my wastegate along with the sound of my 3 inch apex n1 exhaust, they crap themselves, I had some dude going the opposite way in his 97-99 2G stick his head out the window and stare at me as we passed each other. Ha ha, it was great.

 

[neuralracing]

Is the LOUD sound only at WOT? Anyone that can post a link to a Video or sound clip on one of these?

 

[2GeNTSi]

Lol it's loud alright...my friend just installed one on his 2g w/ stock T-25 though. I think it did loose some top-end but I only noticed it around +6k. The only mods he has are filter, mbc, test pipe, crushed 1g bov, o2 housing w/ dump, and dump tube removal. Maybe it'll pull a little better top-end once he bolts on the 3" downpipe I let him borrow.

 

[Kapok6]

Is the LOUD sound only at WOT? Anyone that can post a link to a Video or sound clip on one of these?

The loudness depends on how much boost you are pushing. The more the throttle is pressed down, the more boost is being produced, the wider the wastegate has to open to control the boost. Therefore, it is loudest at WOT, but you can hear it before that point depending on how much gas you a giving it.

 

[oldman]

I had some dude going the opposite way in his 97-99 2G stick his head out the window and stare at me as we passed each other. Ha ha, it was great.

That's probably me thinking I got to sell my car and move on to something else.

Just to clear things up little.

1. O2 dump will not eliminate boost creep in most case as it plays a very insignificant roll in solving boost creep.

2. The only advantage you get is the noise, which to a lot of us who are older and have been around for a while, it's a huge .

3. The only time o2 dump will make a difference performance wise is if you're flowing a lot of air, a level that most of us will never reach, at which point you should be running a external wastegate mounted on the manifold, preferably re-routed back to the exhaust.

Just my opinion and some facts, please carry on.

 

[hellraz0r1337]

my friend had a o2 dump on his 1g and it was nothing but noise it is really REALLY embarassing almost as bad as my spelling. He bolted it on and 5 days later took it off because he had no extra horse

 

[airmail96]

Has anyone done a dyno with a O2 the dumps into the atmosphere and then one that recirculates into the exhaust?

 

[Kapok6]

That's probably me thinking I got to sell my car and move on to something else.

Just to clear things up little.

1. O2 dump will not eliminate boost creep in most case as it plays a very insignificant roll in solving boost creep.

2. The only advantage you get is the noise, which to a lot of us who are older and have been around for a while, it's a huge .

3. The only time o2 dump will make a difference performance wise is if you're flowing a lot of air, a level that most of us will never reach, at which point you should be running a external wastegate mounted on the manifold, preferably re-routed back to the exhaust.

Just my opinion and some facts, please carry on.

I agree w/ what he is saying. I only drive my car on the weekends, and only for a few hours btwn fri-sun. If I had to drive it everyday, the dump tube would get annoying. I wouldn't spend $300 brand new for one, not worth the money. I only have it b/c I bought an evo III big 16G, evo III stage 2 ported exhaust manifold, and the satinless steel dump tube brand new for $680. That's why I have it, other wise I would just have gone w/ the evo 3 o2 sensor housing which was my plan in the beginning, but I saw this deal and thought why not. It can be a nice ego booster at little local car meets when a bunch of kids that know nothing about their cars hear your exhaust and come over and start asking you about your car (in which case just play stupid) but that is the extent of the value in really having one in my opinion.