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Should I Port My .55 AR BEP Housing's Wastegate or not?

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szutavern

Probationary Member
17
0
Apr 5, 2005
Lincoln, Nebraska
Hey DSM freaks, Should I Port My .55 AR BEP Housing's wastegate port or not?

Overtwisted my HTA68 and now replacing it with a HX40 with a BEP and external dump off O2

Shooting for about 500hp this season +600 next and yes I have all the supporting mods that will get me there
31psi
2100 injectors on E85
Tial 44 Wastegate external dump

Lemme know your thoughts

Mucho thanks

Been trolling this site forever, first time posting question.
 

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I'm running a HX-35 in that housing. I have not ported my wastegate opening at all and during engine break in I had no trouble with my turbo maintaining the 17psi that my wastegate (Tial 38 MVS recirculated) spring was set at.

Maybe someone with a HX-40 can chime in but for me there was no need to port it and boost creep was not a problem.
 
Anything you can do to reduce back pressure on that .55 housing will be good. I was running one and had problems on the hot side, getting all of the exhaust out that little hole. I broke 2 HX40's before I went to a .70 T3. I snapped one exducer off clean at the shaft and the other looked like this...

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Thanks 1990

So port the sheeait outta it... is that what you would do?
 
thing is i have a .55 ready to go. Should I open it clear up to match the gasket?
 
thing is i have a .55 ready to go. Should I open it clear up to match the gasket?
Doesn't matter will still be too much backpressure. Big wheel in small turbine housing equals disaster. Sell it be patient and get a .70. Think long term not short term which will destroy your investment. Turbo that is. That 55 housing can be sold.
 
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After breaking HARD parts like I did, I recommend exacly what ceedawg suggested and what I finally did, go .70 or larger. It is the throat of the housing that is to small. @JusMX141 can tell you the same thing that we are. I have tried to use the .55, but hurt turbo's, so I went with something that could breath a little better, per suggestions to me :) Now with a HX35, the .55 housing seems to be ok, it is just the HX40's.
Justin (JusMX141) would be the guy to ask if porting that housing will help you, hey Jus, give this man a little input please.
 
Anything you can do to reduce back pressure on that .55 housing will be good. I was running one and had problems on the hot side, getting all of the exhaust out that little hole. I broke 2 HX40's before I went to a .70 T3. I snapped one exducer off clean at the shaft and the other looked like this...

You must be logged in to view this image or video.

How does opening the wastegate hole help reduce drive pressure? Wouldn't that mean you could just put the largest wastegate possible on the smallest exhaust housing and obtain great spool then just open the wastegate to have your exhaust housing flow better? Forget VGT technology i'm going purchase 5 wastegates off ebay instead.

"The boost/backpressure ratios at different pressures and flows are set by the geometry of the turbo and cannot be altered by the wastegate. The wastegate can only be used to limit boost, the backpressure to drive that boost remains." -per random internet post I am sure will be disregarded. I'm fairly sure that the wastegate opening is only inadequate if you cant lower your boost however low you want it but I could be wrong.
 
Thing is the external dump O2 pipe will flow at least 2-3x what that BEP wastegate hole can flow. All I was worried about was controlling boost really. Much great help fellas. Keep it coming.
 
How does opening the wastegate hole help reduce drive pressure? Wouldn't that mean you could just put the largest wastegate possible on the smallest exhaust housing and obtain great spool then just open the wastegate to have your exhaust housing flow better? Forget VGT technology i'm going purchase 5 wastegates off ebay instead.

"The boost/backpressure ratios at different pressures and flows are set by the geometry of the turbo and cannot be altered by the wastegate. The wastegate can only be used to limit boost, the backpressure to drive that boost remains." -per random internet post I am sure will be disregarded. I'm fairly sure that the wastegate opening is only inadequate if you cant lower your boost however low you want it but I could be wrong.
Just to be clear, I never said opening it up would help. Justin has seen first hand what is happening with HX40's and the .55 BEP housing so I hope he chimes in. I have first hand experience that the dam thing chokes up and gets SUPER hot because it can't get out thru the THROAT, that is why I suggested .70 to save someone else the trouble. I hope that makes sense. You lose a little spool but it breathes better. It REALLY wants a bigger housing than a .70 to be honest.
 
Just to be clear, I never said opening it up would help. Justin has seen first hand what is happening with HX40's and the .55 BEP housing so I hope he chimes in. I have first hand experience that the dam thing chokes up and gets SUPER hot because it can't get out thru the THROAT, that is why I suggested .70 to save someone else the trouble. I hope that makes sense. You lose a little spool but it breathes better. It REALLY wants a bigger housing than a .70 to be honest.

Yep understand, unfortunately I am ready to bolt this biatch up today, and I looked at the tiny wastegate hole in it and said WTH?

Guess I'll just have to keep it under 7,000 RPM till I get the funds for another upgrade DAMMIT

; )
 
Yep understand, unfortunately I am ready to bolt this biatch up today, and I looked at the tiny wastegate hole in it and said WTH?

Guess I'll just have to keep it under 7,000 RPM till I get the funds for another upgrade DAMMIT

; )

I too suggest going bigger than the .55. Turbolab sells a .82 p-trim housing I believe for 150. I did log 63 lb/min through my .55 at 38 psi all the way up to 8k rpm however.
 
Yeah I would use it. With the .44 WG you will be better off. I am running the .38. It's small but it's all I had :)
You can get your 500hp with it, just keeping you informed on what is happening with other setups!
I had to go get my "Boost Fix" a second ago. I needed to move the car to put my sons toolbox in the garage....38lbs, 587ish :D so I feel better now. Good luck and if you have any more questions, that is what I WAS using and still have a BNIB .55 for another project so feel free to ask. I will tell what I have experienced. :thumb:
 
Yeah I would use it. With the .44 WG you will be better off. I am running the .38. It's small but it's all I had :)
You can get your 500hp with it, just keeping you informed on what is happening with other setups!
I had to go get my "Boost Fix" a second ago. I needed to move the car to put my sons toolbox in the garage....38lbs, 587ish :D so I feel better now. Good luck and if you have any more questions, that is what I WAS using and still have a BNIB .55 for another project so feel free to ask. I will tell what I have experienced. :thumb:


Haha thanks homes much appreciate your help.
 
IL be running a hx40 in a .55 bep housing 10 blade turbo. This is a,street car any issues I'll be upgrading to a t3 set up from archer fabrication when the time comes. I got lots of tuning and work to do so well see.
 
I have an HX40 with a billet comp wheel and the .55 BEP housing.

This is the porting I did on mine and I have trouble keeping boost stable over 34psi
I would do this, and then little more.

In a perfect world you'd want to get the hole to as close to the size of the wastage gate valve as possible. (this is not going to happen for us with BEP housings) but you can get damn close.

I can only speak to my experiences, and I guarantee if you don't port yours out at all you will have trouble controlling boost from the get go with this housing.

[EDIT]

keeping it under 7K is not going to magically enable you to control your boost. It will spike at peak VE in your power band (or where ever max boost should hit for your setup) and continue to build boost after that point if you do not have adequate space to move the gases.

You must be logged in to view this image or video.
 
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Yeah I would use it. With the .44 WG you will be better off. I am running the .38. It's small but it's all I had :)
You can get your 500hp with it, just keeping you informed on what is happening with other setups!
I had to go get my "Boost Fix" a second ago. I needed to move the car to put my sons toolbox in the garage....38lbs, 587ish :D so I feel better now. Good luck and if you have any more questions, that is what I WAS using and still have a BNIB .55 for another project so feel free to ask. I will tell what I have experienced. :thumb:
So you had to move the car 20ft but instead went out pulled a couple car lengths on a turboed Busa? You have a boost problem :)
 
Yeah, for the life of me, I can't get over "Boost Withdrawl's"!!!!
Gotta have my fix, man!!! (at least it was a good excuse to go for a "spin") :p
 
Yep understand, unfortunately I am ready to bolt this biatch up today, and I looked at the tiny wastegate hole in it and said WTH?

Guess I'll just have to keep it under 7,000 RPM till I get the funds for another upgrade DAMMIT

; )

Keeping it under 7k won't keep it from boosting! Get the .70 housing don't waste your time by impatience time is money!!!
Don't say we didn't tell ya! You'll be buying another turbo to replace the broken shaft or broken exhaust wheel in that turbo in no time. Then it's gonna cost you a turbo and a new .70 turbine housing. More than twice what you would have spent. Do it wrong ya do it long.
 
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I have an HX40 with a billet comp wheel and the .55 BEP housing.

This is the porting I did on mine and I have trouble keeping boost stable over 34psi
I would do this, and then little more.

In a perfect world you'd want to get the hole to as close to the size of the wastage gate valve as possible. (this is not going to happen for us with BEP housings) but you can get damn close.

I can only speak to my experiences, and I guarantee if you don't port yours out at all you will have trouble controlling boost from the get go with this housing.

[EDIT]

keeping it under 7K is not going to magically enable you to control your boost. It will spike at peak VE in your power band (or where ever max boost should hit for your setup) and continue to build boost after that point if you do not have adequate space to move the gases.

You must be logged in to view this image or video.
You know, of all things, I didn't have surge. I had a bit of fluctuatuon but when it hit, it hit hard. It varied up top around 30+.
 
Thanks for all the help fellas. The "keep it under 7,000" statement shouldda been followed by a /scarc tag
 
Well I'm not going to be running the BEP housing anymore any recommendations to exhaust housings? goal i 700-900area
 
My hx40 recently failed and I couldn't figure out why. It was never pushed too hard never over 25psi or 42lb/min. Lasted 5 years before it failed though. I run a turbo blanket and header wraped o2. Wonder if it was the heat that caused it. *sigh* guess it's time to switch.
 
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