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aem truboost proplem

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Old 07-26-2009, 05:42 PM
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Default aem truboost proplem

when my car was on the dyno the other day it would not go over 6psi, and the boost controller A is set at 12psi. i checked all the vacuum lines and they are all routed just like the manual says. fist i thought one of the vacuum lines for the Wastegate fell off or something (since the car is not going over 6 psi, and the wastegate has a 6psi spring) but the vacuum lines are good.

i am completely lost now, please help me out.
Old 07-26-2009, 06:35 PM
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this might sound stupid but are you sure your running program A? When you turn the key on the tru boost will tell you which program your on. You also know that the numbers in the display are for duty cycle and not boost numbers? For example each set up is different but my duty cycle is at 83 for 8lbs boost.
Old 07-26-2009, 07:02 PM
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when i turn the key on is shows A and then 00 until i actually start the car. once i start driving the boost will climb up to about to 5.85 and that is nowhere near enough on a 8.6:1 motor.

also i noticed that the boost solenoid is making a crinkling sound when the key is on and the motor is not started. is this normal ?

BTW i bought this boost controller brand new from speed inc, so i don't think it is defective.
Old 07-26-2009, 07:05 PM
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and another thing that really frustrates is that it say to press both buttons to start programming and keep hitting them each time for 2 seconds to go on the next menu. the furthest i got is to the boost A setting after that it does not really work.

if i knew this would be so ******* complicated i would reconsider buying an aem controller.
Old 07-26-2009, 08:49 PM
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sounds like you need to set your duty cyle, I would go the AEM website they have a forum and instructions and useful info on setting it up. It takes a while to understand how it works.
Old 07-26-2009, 09:30 PM
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can you tell me how to do it ? i figured out how to work around the menu now
Old 07-26-2009, 09:49 PM
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Duty cycle is a strange one, I started at 50 and checked my boost and kept adjusting up by 3 until I got the boost I was looking for. On my set up the duty cycle didn't change boost until like 60.
Old 07-26-2009, 09:53 PM
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https://ls1tech.com/forums/forced-in...uty-cycle.html

i found this, it might help.
Old 07-26-2009, 10:44 PM
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where do you enter duty cycle ?

SCb or SCr
Old 07-27-2009, 12:02 AM
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ok just went for a drive and i was getting 7.36psi

scb was set at 90

spr wastegate spring i have set at 6

A was set at 10

so why am i only getting 7psi ?
Old 07-27-2009, 06:45 AM
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A and B are your duty cycle. turn it up and you should see more boost.
Old 07-27-2009, 08:00 PM
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ok i had A up to 30 now and made the same ****, cuts out at about 7.36
Old 07-27-2009, 08:04 PM
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i have an 11.6 lb spring and i run between 12-13psi with A at 60. you might need to turn it up some more?
Old 07-27-2009, 08:45 PM
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this boost controller is supposed to double the waste gate spring and if you have a 11.6lb spring and you already have the duty cycle set at 60 and only getting 12-13psi how the hell are you supposed to get 22 psi out of it ?
Old 07-27-2009, 09:13 PM
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i didnt know wtf i was doing and i turned it up to 80 and it hit 18.6psi. i would think if i went to 90 it would do it.
Old 07-28-2009, 02:04 AM
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ok i think turning up A to 60 solved the problem, but i am not sure because my serpentine belt flew off at 8psi and i had to stop so my motor does not overheat.
Old 07-28-2009, 08:11 AM
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how much boost are you trying to run?
Old 07-28-2009, 12:24 PM
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I have a 6 lb spring and duty cycle set at 72 and I see 10 lbs boost.
Old 07-28-2009, 08:10 PM
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Originally Posted by dudeman
how much boost are you trying to run?
i need to have it set for 12psi, so i can get it tuned, but obviously don't want to hit those numbers without a proper tune.



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