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Boost creep
greeting.. boost rise when set to10psi the problem now is boost hold all the way. when RPM Climb around 5000+all the way redline boost creeps higher and higher around 12-13. anything should be warry about it? i just cant keep goin seeing creep like that for safety to engine i pull my foot right the way!!:confused0068:
solutions for my issues i'll be much pleased..http://i1284.photobucket.com/albums/...ps2636cbb5.jpg |
What turbo kit do you have?
A little bit of creep should be tolerable as long as your data logs look clean of knock. Usually this happens when your wastegate is insufficient at venting the amount of exhaust gas you are throwing at the turbo. Also, if you have one, check your boost controller and all the lines that go to and from your boost controller and wastegate for leaks. |
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What kind of boost controller are u running? Is the wastegate recirculated or open to atmosphere?
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im using regualer vacuum tees to connect hoses that used for water/air metal one should effect? and plastic zip ties
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If you know what you are doing, disconnect the boost controller and go back to just using the wastegate. This will diagnose the problem as:
1. Boost controller malfunction Or 2. Wastegate malfunction or leak in the boost refrence hoses |
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What style of Vaccuum line? Cheap "silicone" rubber tends to swell and "drop" pressure. But not usually till higher boost.
Keep the Vaccum lines as short as possible. Avoid "T's" that reduce inside diameter or are a restriction. I usually plumb the turbo compressor housing direct to wastegate. If it still does it.... Then either the wastegate has insufficient flow, or if the turbine section is restrictive, the timing could be too low (creates excess heat energy, has greater affect on small housings). But I like boost creep, 2-3 pounds is very nice ;) |
the vacuum start from the intake Manifold Tees not clamped or zip tie just do you think this the cuses leaks? on 10psi?
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what can I do im using two of T brass tees that's not good at all or?
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I have never ever seen boost creep on my FBM kit, only boost loss in the upper RPM range. I would say there might be an exhaust leak at your wastegate.
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hmm ill snap shot some and post the way im connecting the tees alright
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It will be hard to tell since it might only show up when you are boosting hard. I would look for black marks on the flanges showing exhaust escaping. What style MBC is the Full Blown one? I didn't even know they sold one.
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A goo rule for any "sound" build. Boost referenced fuel pressure regulators, map sensors and wastegates get their own dedicated boost source. Everything else doesn't matter. |
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this is the manifold I cant snap shot the one down there I already connect tee T brass goin left for BOV and right For Anther Tee T brass http://i1284.photobucket.com/albums/...psc46f91b0.jpg
this is the 2st Tee T brass coming from the connectd 1st T brass manifold. the down for Gauge and upper goin to boost controller.http://i1284.photobucket.com/albums/...ps59b96fe7.jpg |
by the way the 1st Tee T brass not clampd on any ways or zip ties.. and if this wrong way im doin it please help me fix it
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Good install practice is as I said... Wastegate gets it OWN pressure source, preferably right from the compressor housing. Map sensor gets it's own source. Fuel Pressure regulator (in the case of return style rising rate systems) Gets its own intake manifold source. I am not saying this is your problem, but it is how it SHOULD be done. |
Run a line directly from your compressor housing to the wastegate.
If there is no boost creep, I would suspect your boost controller. |
The Garrett compressor housings don't come tapped for a vacuum source. My recommendation has always been to run a vacuum manifold off one of the two vacuum hoses that come off the back of the intake manifold.
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Like I said, if you want to diagnose this problem you are going to have to remove the boost controller from the equation. Connect boost or manifold source directly to wastegate. See if there is still creeping going on.
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Either way, I think isolating the boost controller is a good first step in troubleshooting the creep |
Swat come into my house., disrespect my family, and do you know what. It was you!
Sent from my SGH-I337M using Tapatalk 4 |
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I never narced on nobody |
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ive never had this problem with my kit |
I see ... thanks guys ill try connect vaccum directly to the wastgate lets see what happen.
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well... my car throwing CEL+TRC Lights keep me wondering plus boost creep etc I was thinking what the hell this catch can hose hanging over there. the mechanic keept the right hose zip tie at struce tower it was not caped or anything its just keept open to atmosphere.. do you think this is the source problem of CEL boost creep aren't this doin vacuum leak etc?
http://i1284.photobucket.com/albums/...ps303c08b2.jpg |
any support?
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Can't see that causing boost creep that's just crank pressure. It's odd that he has the one side just open like that, most remove the pcv and put that hose in its place.
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Sent while popping Mollys |
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Creep usually has nothing to do with the boost controller (though i have seen the ball stick in a few cheap mbc's), but rather the ability of exhaust gas to bypass the turbine at higher flow rates. Stiffer spring will only make it worse. |
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Correct installation of a catch can: http://www.ft86club.com/forums/showthread.php?p=654722 |
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