too much boost
i recently installed a catback on my car. now it has a dp, high flow cat, catback, intake and reprogrammed ecu. i also have a home depot type mbc. my problem is that the car is boosting 12-14 psi from 3K- transition, it holds about 11 at the transition and after the transitions it goes anywhere from 14-19 psi. i have the mbc almost closed completely so im wondering why it is making so much boost. and when it was closed completely it was making like 13psi and creeping to 17 up top
i guess it is boost creep. anyway should i get electronic boost controller or try a different mbc. or maybe i should check vac hoses, but wouldnt that cause a link and make less than stock boost. before the catback i was getting 10.5-9-10.5 boost pattern |
Closing a MBC will increase your boost. Open it up to reduce boost
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Originally Posted by adam c
Closing a MBC will increase your boost. Open it up to reduce boost
i thought closing it would allow less pressure. so if i turn it counterclockwise, opening it up more, it will lessen boost pressure? the contoller im using is like the one here: http://robrobinette.com/boost_controller.htm on that page he closed it fully and got 8 psi and when he backed it out, turning it counterclockwise, he got 13 psi |
Originally Posted by desmond
i thought closing it would allow less pressure. so if i turn it counterclockwise, opening it up more, it will lessen boost pressure?
the contoller im using is like the one here: http://robrobinette.com/boost_controller.htm on that page he closed it fully and got 8 psi and when he backed it out, turning it counterclockwise, he got 13 psi so i need to close it fully to the right, then back it out a couple of turns, the close it slowly till i get the desired boost i want? |
i played around with it a little and now i get 10-8-8, so i guess that would be almost closed. so if i turn it the other way and fiddle for a bit i should get it right
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Manual boost controllers take a bit to get them adjusted right. Clockwise (closing) gets you more boost. Counterclockwise (opening) lowers your boost. Do not install the prespool controller. It will make adjustments nearly impossible.
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Originally Posted by adam c
Manual boost controllers take a bit to get them adjusted right. Clockwise (closing) gets you more boost. Counterclockwise (opening) lowers your boost. Do not install the prespool controller. It will make adjustments nearly impossible.
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could it be possible that your second turbo is on its way out?
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may b different depending on how u hooked up the mbc
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Originally Posted by birdy01
may b different depending on how u hooked up the mbc
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question...my buddy..just bought the turbo xs boost controller. i saw the hook up on rob's site, my question will there be a problem if he leaves the stock pill for the prespool, or does he need to get a controller or tee the line..i was thinking that it will control primary, but at transition it would spike, his mods r,
gerddy intake (dont know brand) downpipe apexi N1 exhaust. greddy polished elbow kit, had the lower ic pipe on just not the inake elbow yet. got the one with injector bosses. |
the mbc can also go bad, my homedepot type boost controller lasted for about 2 months until it couldnt hold anything above 10psi, but what do you expect for $5 :\
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Originally Posted by desmond
i recently installed a catback on my car. now it has a dp, high flow cat, catback, intake and reprogrammed ecu. i also have a home depot type mbc. my problem is that the car is boosting 12-14 psi from 3K- transition, it holds about 11 at the transition and after the transitions it goes anywhere from 14-19 psi. i have the mbc almost closed completely so im wondering why it is making so much boost. and when it was closed completely it was making like 13psi and creeping to 17 up top
i guess it is boost creep. anyway should i get electronic boost controller or try a different mbc. or maybe i should check vac hoses, but wouldnt that cause a link and make less than stock boost. before the catback i was getting 10.5-9-10.5 boost pattern 1. If it is boost creep, no boost controller will control the boost level. You will need to port your WG. 2. Needle-valve boost controllers still use the stock duty-controlled solenoids to actually "control" the boost, and are not as effective as EITHER ball-spring MBC's or electronic controllers with the actuator exits (to the solenoids) plugged. |
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