how much boost should i run??

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how much boost should i run??

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Mitsubishi Forum >> Tech Help and Information >> Nitrous, Super Chargers, & Turbos >> how much boost should i run??

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how much boost should i run?? - 7/29/2007 8:39:04 PM

ck76

Posts: 33
Joined: 7/21/2007
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i got a 98 eclipse, hahn racecraft stage II 20g turbo, 2 stage fuel pump, 270cc fuel injectors, msd coil & wires. all stock internals,,,what kind of boost p.s.i. should i run???

Post #: 1

RE: how much boost should i run?? - 7/29/2007 8:40:31 PM

jlh077464

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Joined: 10/27/2006
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Is this a 420a or 4g63?

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RE: how much boost should i run?? - 7/29/2007 8:52:10 PM

ck76

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Joined: 7/21/2007
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420a

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RE: how much boost should i run?? - 7/29/2007 9:13:50 PM

jlh077464

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I wouldnt run over 8psi with the stock internals. I'd run 6 on a day to day basis myself.

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RE: how much boost should i run?? - 7/30/2007 1:43:55 AM

silvercoupe97

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Do you get any signs of boost creep? If not, 8 psi is good. Don't go any higher than 10 psi on stock internals! If you do creep, how high? Otherwise, 8 psi.
JL's recommendation is a good one too.

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Post #: 5

RE: how much boost should i run?? - 7/30/2007 10:42:45 AM

RCJr9186

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From: Summerville, SC
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w/ a 20g turbo i wouldn't go any higher than 8lbs... thats a good sized turbo to be pushing 10lbs. a good rule of thumb for the 420as is not to go over 10psi but on a turbo as large as the 20g 8 sounds good. i'm curious about something though... you said you have what size injectors? 270cc's i don't believe is correct... and if so i don't think that would push 8lbs to be honest lol once you get a bottom end rebuild you will be good up to about 20lbs of boost before you need head work.

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RE: how much boost should i run?? - 7/30/2007 4:07:03 PM

ck76

Posts: 33
Joined: 7/21/2007
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thanks for the advice guys, ill stick with 8 $ this winter i'll beef up the lower end & turn up the boost!!!!!!!!!!!!!!!!!!!!

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Post #: 7

RE: how much boost should i run?? - 7/30/2007 9:31:15 PM

ck76

Posts: 33
Joined: 7/21/2007
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also should i be using a bigger inj. than 270cc???????????

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RE: how much boost should i run?? - 7/30/2007 9:39:21 PM

jlh077464

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Joined: 10/27/2006
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absolutly!....I wouldn't think you would be able to run 8lbs of boost with 270cc. What exactly are you running right now?

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RE: how much boost should i run?? - 7/31/2007 8:45:13 PM

ck76

Posts: 33
Joined: 7/21/2007
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acording to the kit i got from hahn i am runnung the 270 CC,,, what should i get for my 20g turbo???? and what will be the diffrence??????????

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Post #: 10