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Old 12-06-2012, 09:24 PM   #1
Subarupower100
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Default 38mm or 44mm wastgate

Hey can ya guys help me to what wastgate to use if I'm going to tun a 62mm turbo
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Old 12-06-2012, 09:33 PM   #2
cowboy_Rob
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Depends more on how much boost you plan to run. The lower you want to be able to turn the boost the bigger a gate you may need
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Old 12-06-2012, 10:05 PM   #3
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Whatever you can afford. There's nothing to lose by going too big.
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Old 12-06-2012, 10:07 PM   #4
Subarupower100
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I think the most ill be running is 25 psi
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Old 12-06-2012, 10:08 PM   #5
Subarupower100
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So if I get a 38mm ill be fine
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Old 12-06-2012, 11:09 PM   #6
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The most you'll be running means nothing to us. We need to know the LEAST you'll be running.
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Old 12-06-2012, 11:35 PM   #7
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MOST tuners want a EWG bare minimum at 1bar (14.7psi boost). The practice is; the least amount of boost you want, you will need a bigger opening 38mm,40mm, 44mm, 46mm...etc. To be safe, just get a 44mm EWG and a 1bar spring and RUN IT!

Not sure if I explained that right. lol
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Old 12-07-2012, 12:22 AM   #8
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^^^Pretty much. I wish I had gotten a 44mm EWG instead of my 38mm.
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Old 12-07-2012, 09:37 AM   #9
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I've heard some reputable tuners on here say the same thing in person - it's hard to control boost at lower levels (~20PSI) using smaller 38mm wastegates. I plan on running a 3071r on low boost using a 44mm.
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Old 12-07-2012, 01:04 PM   #10
Subarupower100
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Oh ok guys thanks for the help .... Ill just get the 44mm
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Old 12-07-2012, 01:48 PM   #11
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Quote:
Originally Posted by drewvdw View Post
Whatever you can afford. There's nothing to lose by going too big.
This isn't exactly true... larger wastegates have slightly more sluggish spool. I would always recommend people to use a wastegate size that is enough to prevent boost creep... but not something silly like a 50 or 60mm wastegate.

My 2 cents,

Jasper.
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Old 12-07-2012, 02:45 PM   #12
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No, they don't. Think about it. Why would it? Because it's bigger and has the potential to flow more?

Think about it like this, a fire hydrant can still move as much (or little) water as a garden water spigot. Both can keep it at a slow drip rate. The fire hydrant may be more difficult to set, but it is very possible to do.
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Old 12-07-2012, 02:50 PM   #13
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Quote:
Originally Posted by drewvdw View Post
No, they don't. Think about it. Why would it? Because it's bigger and has the potential to flow more?

Think about it like this, a fire hydrant can still move as much (or little) water as a garden water spigot. Both can keep it at a slow drip rate. The fire hydrant may be more difficult to set, but it is very possible to do.
Agreed^
Spool up isn't affected at all as long as you set it up properly
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Old 12-07-2012, 08:11 PM   #14
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Big Turbo/Low Boost = Bigger Wastegate
Big Turbo/High Boost = Smaller Wastegate
Small Turbo/High Boost = Smaller Wastegate
Small Turbo/Low Boost = Bigger Wastegate
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Old 12-08-2012, 12:38 AM   #15
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So what is considered low boost out of curiousity?
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Old 12-08-2012, 12:47 AM   #16
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I run a Dom4.0 At 17 pounds with zero issue with my Tial 38 MVR. I haven't had any issues with higher boost around 25 either. I doubt it helps but just laying it out for some info.
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Old 12-08-2012, 12:53 AM   #17
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You people don't ****ing UNDERSTAND!!! High boost will be EASIER with a SMALLER wastegate. You can run no wastegate and all and get a bajillion pounds of boost! The point of a wastegate is to REDUCE the boost pressure. Just as using a turbo capable of 50psi (running at say 24psi) is better than running a turbo capable of 24psi (running at 24psi). The more headroom you have, the better.
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Old 12-08-2012, 01:20 PM   #18
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Smaller gate, higher boost, bigger gate,lower boost.
That's always been my understanding
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Old 12-08-2012, 03:13 PM   #19
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Quote:
Originally Posted by fobiawrx View Post
Big Turbo/Low Boost = Bigger Wastegate
Big Turbo/High Boost = Smaller Wastegate
Small Turbo/High Boost = Smaller Wastegate
Small Turbo/Low Boost = Bigger Wastegate
haha finally some good info
I was reading the posts and shaking my head lol
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Old 12-08-2012, 08:32 PM   #20
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From my limited experience, no subaru ever needs more than a 38mm. You get finer resolution/control with a smaller gate too.
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Old 12-09-2012, 10:09 PM   #21
sense of nature
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Quote:
Originally Posted by KillerBMotorsport View Post
From my limited experience, no subaru ever needs more than a 38mm. You get finer resolution/control with a smaller gate too.
Good to know, I'm sure you have more experience than most too
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Old 12-11-2012, 12:04 PM   #22
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Quote:
Originally Posted by KillerBMotorsport View Post
From my limited experience, no subaru ever needs more than a 38mm. You get finer resolution/control with a smaller gate too.
My brother couldn't run a 38mm with his 6235 it would over boost constantly. But I agree no stock location subaru needs anything more than a 38mm. Sounds better as well

I completely agree with what you said.
Quote:
You get finer resolution/control with a smaller gate too.
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Old 12-11-2012, 12:09 PM   #23
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Quote:
Originally Posted by Bones702 View Post
I run a Dom4.0 At 17 pounds with zero issue with my Tial 38 MVR. I haven't had any issues with higher boost around 25 either. I doubt it helps but just laying it out for some info.
here is your proof.
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