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Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

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Old 06-16-2013, 01:36 PM   #26
JAMM0N
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i run a 38mm tial ewg @ 17 PSI w/ stock mount

a friend running a 44mm tial ewg @ 18? w/ PW top mount

he should be able to push 20 but i'm not to sure about that cause the top mount gives you a better boost increase right?

also if i want to keep my 38mm w/o having to upgrade what should i look for? what should i watch out for so that i dont move up to a 44mm? i ask so others know (inlet side/heat side etc...)
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Old 06-17-2013, 08:12 AM   #27
scott06sti
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the 38mm should be able to handle pretty close to what the 44mm does
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Old 06-17-2013, 06:06 PM   #28
VinceCarter
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I've read it's as simple as how much exhaust gas needs to be diverted from the turbo. Therefore lower PSI needs less gas which means you may need a bigger opening (44mm) to divert those gases. That's where the low boost=44mm comes from.

I read a great article on the subject but I'll have to find it if I can and post it.
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Old 06-17-2013, 07:28 PM   #29
decodeddiesel
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Quote:
Originally Posted by VinceCarter View Post
I read a great article on the subject but I'll have to find it if I can and post it.
It would be nice to see that article.
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Old 06-17-2013, 10:22 PM   #30
KillerBMotorsport
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Quote:
Originally Posted by VinceCarter View Post
I've read it's as simple as how much exhaust gas needs to be diverted from the turbo. Therefore lower PSI needs less gas which means you may need a bigger opening (44mm) to divert those gases. That's where the low boost=44mm comes from.
It's exactly that simple. If you've got a large displacement engine running low boost. Examples would be a V-8 challenger, viper or any other large displacement car pushing 8psi of boost. This is where a larger WG makes sense.
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Old 06-17-2013, 11:33 PM   #31
WolfPlayer
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49lb/min turbo (FP Green, SZ49, etc) and 38mm gate on my STI. With the 13psi spring, it holds 13psi just fine with no creep (bypassed the EBCS for testing). That's a fair amount of bypassed gases. I have no doubt that I could run a weaker spring and lower boost. The 38 flows plenty for our small 150ci motors with bigger turbos and lower boost. Currently running 22psi with tons of headroom on the wastegate duty cycle (and that's with the weak 13psi spring).
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