boost creep or what????

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boost creep or what????

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Mitsubishi Forums >> Tech Help and Information >> Nitrous, Super Chargers, & Turbos >> boost creep or what????

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boost creep or what???? - 2/8/2008 6:44:45 PM

lhausi2

Posts: 702
Joined: 11/5/2007
Status: offline

Alright I think my car has boost creep but not quite sure. Its a 97 gst with a big 16g on it. And it boosts fine until I hit 6000 rpms then the boost will go from 14 up to 20 within a second. As for my awesome exhaust system thank to the previous owner, which consists of the 02 housing bolted onto the turbo, and the downpipe is welded to the o2 housing but due to the sh** wleds its cracked. The exhaust is custom 3 inch piping with a universal cat and a nexus muffler. This is why I believe its creep, please tell me if im dead on or way off

Post #: 1

RE: boost creep or what???? - 2/8/2008 6:50:21 PM

Sebba

Posts: 14593
Joined: 2/20/2006
From: San Antonio, TX
Status: online

This is boost creep. http://www.youtube.com/watch?v=Zrf1FgXQxs0

You see the boost reaching the desired setting, and continue rising. This is because your wastegate is too small.

_____________________________

These cranks are made for walkin'''', and thats just what they''''ll do, one of these days these cranks are gonna walk all over you

(in reply to lhausi2)

Post #: 2

RE: boost creep or what???? - 2/8/2008 7:21:59 PM

Sebba

Posts: 14593
Joined: 2/20/2006
From: San Antonio, TX
Status: online

Apparently it jumps up.. not creeps. So that to me means the wastegate isnt opening

_____________________________

These cranks are made for walkin'''', and thats just what they''''ll do, one of these days these cranks are gonna walk all over you

(in reply to Sebba)

Post #: 3

RE: boost creep or what???? - 2/8/2008 10:32:04 PM

lhausi2

Posts: 702
Joined: 11/5/2007
Status: offline

thanks i'll try opening it tomorrow and we'll see what happens

(in reply to Sebba)

Post #: 4

RE: boost creep or what???? - 2/8/2008 10:37:44 PM

lhausi2

Posts: 702
Joined: 11/5/2007
Status: offline

and yeah i'm not sure actually it might have been like the video i'll tell ya tomorrow after i drive it again, if it's the shooting one i'll try the wastegate

(in reply to lhausi2)

Post #: 5

RE: boost creep or what???? - 2/17/2008 6:23:45 PM

lhausi2

Posts: 702
Joined: 11/5/2007
Status: offline

yeah it seems to be creeping up there, could that be due to my ghetto fab exhaust?

(in reply to lhausi2)

Post #: 6

RE: boost creep or what???? - 2/17/2008 10:00:03 PM

Sebba

Posts: 14593
Joined: 2/20/2006
From: San Antonio, TX
Status: online

No... it has to do with not removing the excess exhaust gas quick enough. You need a bigger wastegate.

_____________________________

These cranks are made for walkin'''', and thats just what they''''ll do, one of these days these cranks are gonna walk all over you

(in reply to lhausi2)

Post #: 7

RE: boost creep or what???? - 2/17/2008 10:51:11 PM

lhausi2

Posts: 702
Joined: 11/5/2007
Status: offline

but how the fu** did it boost fine before at 20 psi? that doesn't make sense to me

(in reply to Sebba)

Post #: 8

RE: boost creep or what???? - 2/18/2008 4:32:43 PM

lhausi2

Posts: 702
Joined: 11/5/2007
Status: offline

oh i read if you keep running 20 psi and more constantly it'll wear out,got it ha
and yeah i took the rod off the actuator side like TE told me to, and drive it like that, took longer to boost but still boosted fine and bogged around 6k rpm's

(in reply to lhausi2)

Post #: 9

RE: boost creep or what???? - 2/18/2008 7:40:40 PM

Sebba

Posts: 14593
Joined: 2/20/2006
From: San Antonio, TX
Status: online

Hmm... i need to see a video of the boost gauge under hard acceleration.

_____________________________

These cranks are made for walkin'''', and thats just what they''''ll do, one of these days these cranks are gonna walk all over you

(in reply to lhausi2)

Post #: 10