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Discussion Starter #1
Alright guys! I'm having a dumb moment and just want to know how dumb.

My wastegate dump pipe fell off on the highway. Dunno how, i guess it just vibrated the hell off. NEw one is in the mail.

The way it's set up though, the WG was dumping hot exhaust onto my air filter.

TEMPORARILY I capped it off until i get the new dump pipe in, but i was wondering how dangerous it is to run WG-less if only running ~7-10 lbs of boost?

It doesn't make sense to say the turbine will keep spinning because the WG was set to max boost before (boost controller more or less fully open) so and as long as the car is running, exhaust is spinning the turbo anyway (and the WG spring keeps it shut anyway until ~8 psi?)

I'm not gonna beat on it until the new dump pipe comes in, i just want to know if it's super uber dangerous or not.

the motor is built with forged rods and vitara pistons so im not worried about that or overboosting

turbo is a hybrid t3/t4 turbonetics.
 

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BATSLOMAN GIVES NO FUCKS.
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how do you cap off the outlet?
 

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98 Civic HX D16Y5
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167 Posts
Sounds like a Boosted EGR setup!
haha

Are you concerned about a lack of backpressure after the wastegate? (Not a problem)

Or it melting your air filter?

I just can't seem to see an issue.
 

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Retired From Hondas
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Well one thing i wouldnt do is get to full boost where its supposed to open up.

I guess you used a 38mm block off plate. but if it were me, id just run no dump til the new one shows up. But still, I wouldnt boost to where it opens up.. I just dont like cleaning that shit off the hood and other parts.

I used lock washers on my dump after mine did the same thing going down 95. I pulled over and went in reverse and grabbed it.
 

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Sloppy Jalopy
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TEMPORARILY I capped it off until i get the new dump pipe in, but i was wondering how dangerous it is to run WG-less if only running ~7-10 lbs of boost?


when the wg outlet is blocked off the turbo will go much higher than 7-10 psi probably like 30psi .just don't drive it hard and you will be ok.
 

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ej8
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Im sorry but your question is just plain stupid.

The wg controls the boost.
If you block the manifold from the wategate, the turbo will spin its heart out.

If you block the wg output. Then the wg will open when its set to. But its output is block so no exhaust will move out. So the turbo will spin its heart out.

So either way the turbo will keep making boost till it cant spin no more.

Now the smart thing to do is unblock the wg and just not boost on it.

I once messed up and put the wrong grade of gas in the car. Was easy to stay out of boost for a day till i cycle the tank of gas.
 

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98 Civic HX D16Y5
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167 Posts
Idk why I didn't even understand that the OP blocked off the WG... That's not a good idea, I was under the impression that he DEFLECTED the WG opening. Much different.

A missing dump pipe doesn't change the way the WG operates. Run it without until you have the right part.
 

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Two men shy of a group
99 civic sedan ex
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If You block the wastegate your basically running without a wastegate period, look up how a wastegate works and what it's for. I guess if the motor is built you will probably be fine but you might kill the turbo or the block if you have a large turbo. big diesel trucks run without wastegate but I'm not sure how that works so it might be bad for a gas engine?
 

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EG5T
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Lol. I don't see how an engine tuned for say 10-15psi, would survive the 25-35psi the turbo would make with a blocked wg. Forged or not - it's going to lean out and detonate soo bad, that the first pull would probably be the last.
Just unhook the TB piping and run it N/A, until you get it sorted.
 

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EG8
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Sounds like a Boosted EGR setup!
haha

Are you concerned about a lack of backpressure after the wastegate? (Not a problem)

Or it melting your air filter?

I just can't seem to see an issue.
Haha, right! *Edit* Must spread rep...

This thread is all kinds of confusing. The wastegate is fine and don't block it period.
 

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2005 Legacy GT
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If you cap the wastegate you are no longer running 7 - 10 lbs of boost. You are running boost until it explodes or the turbo disintegrates. Unless you have a boost gauge so you can monitor it ... and even then ... just run it without the dump.

For example on my turbo build the vacuum hose (which actuates the wastegate) melted. My boost controller was set at ~12 - 14 lbs ... once that hose popped I saw 20+ lbs of boost.

Your wastegate controls your boost.
 

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Discussion Starter #14 (Edited)
how do you cap off the outlet?
ATP Steel External Wastegate Block-Off Flange Deltagate/Tial 35mm 38mm

Came with my WG^

I drove it a bit and the boost gauge never saw more than 10 psi.

And it doesn't make sense to be worried about it "spinning it's heart out" when it's designed to hit >100,000 RPM anyway? My foot is my current boost controller until the dump tube comes in. Once i get off the gas it stops making boost, simple.

+ if big rigs run turbos at insane boost constantly i think mine will be okay hitting a small bit of boost here and there..

Thanks guys

the WG, uncapped, would be spewing exhaust gasses onto my air filter so thats why i need the dump tube so i can route it away from the AF.
 

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ej8
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The rpm of the turbo isnt the problem. The problem is the turbo will continue to build boost until you let off the gas.

So like you said your foot is your boost controller. Which is bad because if you give it a bit to much gas then your boost more then your tune for and blow your motor.
 

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Discussion Starter #16
The rpm of the turbo isnt the problem. The problem is the turbo will continue to build boost until you let off the gas.

So like you said your foot is your boost controller. Which is bad because if you give it a bit to much gas then your boost more then your tune for and blow your motor.
the turbo always builds boost when you're on the gas anyway?

im confused
like i dont boost cruising.. i only seem to make noticable boost at WOT most of the time
 

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98 Civic HX D16Y5
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the turbo always builds boost when you're on the gas anyway?

im confused
like i dont boost cruising.. i only seem to make noticable boost at WOT most of the time
The WG releases excess exhaust gas to limit boost. If you block the WG that excess exhaust gas can only go through the turbine creating MORE boost than your ECU is tuned for and this WILL cause your engine to run LEAN(more air than the ECU can add fuel for), this is when failures happen.
 

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the artist formerly known as drexelstudent11
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If you keep your foot out of it, itll probably be fine since its a pretty big turbo, but I'd rather keep my foot out of it and have the safety of a wastegate with no dump tube versus no boost limit
 

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Discussion Starter #19
been driving it for two days and the only thing i've noticed is a bigger smile on my face than normal.

still haven't seen more than 8 psi of boost, engine is built for 20+ so im having a hard time worrying
 

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ej8
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been driving it for two days and the only thing i've noticed is a bigger smile on my face than normal.

still haven't seen more than 8 psi of boost, engine is built for 20+ so im having a hard time worrying
Pssshh
You dont build motors for psi.
 
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