Forced Induction Custom FI Setup Questions

less boost in 1st gear. more boost in 2nd and 3rd

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Old Aug 31, 2007 | 05:31 PM
  #1  
taiajam's Avatar
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Default less boost in 1st gear. more boost in 2nd and 3rd

hi,
when im launching from; lets say 2000rpm, all the way till 6000 i only get a rate of 2psi on my boostgauge.
my wg is set @ 4,5 psi.
in 2nd gear i do get 4,5 psi also in 4rd.. ect..

i have 70mm coldside chargepies. its kinda oversized, can this be the problem?
or is it possible that my BOV stays open?
of i have a boost leak ?!

plz help
Old Aug 31, 2007 | 05:36 PM
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J-MAN's Avatar
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Default Re: less boost in 1st gear. more boost in 2nd and 3rd

low load condition. i always got lower boost in 1st gear
Old Aug 31, 2007 | 05:38 PM
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taiajam's Avatar
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Default Re: less boost in 1st gear. more boost in 2nd and 3rd

thats gay, how can this be fixed?
im going for 10 psi, and all those psi's are needed in 1st gear ofcourse ^^
Old Aug 31, 2007 | 05:45 PM
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Default Re: less boost in 1st gear. more boost in 2nd and 3rd

i was running 10 psi and would never get over 6 in 1st
Old Aug 31, 2007 | 05:52 PM
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Default Re: less boost in 1st gear. more boost in 2nd and 3rd

its the nature of the beast. you'll never hit as much boost punching it from first as you would from a fifth gear roll.
Old Aug 31, 2007 | 05:58 PM
  #6  
taiajam's Avatar
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Default Re: less boost in 1st gear. more boost in 2nd and 3rd

ok, so its a fact every turbo engine has lessboost in 1st gear.
but there's always something to make is a little more.
Old Aug 31, 2007 | 10:44 PM
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Default Re: less boost in 1st gear. more boost in 2nd and 3rd

how slow does boost build? If the car feels NA then the wastegate is most likely not closing all the way. If you can feel the turbo actually spool its probably alright.
Old Aug 31, 2007 | 10:50 PM
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Default Re: less boost in 1st gear. more boost in 2nd and 3rd

I'm running a smaller sized turbo and it can build full boost in 1st, but by the time the boost gets up there it's allready boucing off the rev limiter, tires lit up and time to shift.
Old Sep 1, 2007 | 06:55 AM
  #10  
taiajam's Avatar
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Default Re: less boost in 1st gear. more boost in 2nd and 3rd

in 1st gear, it feels like i have lots of turbolagg and backpressure

also ive hooked up a missinglink yesterday, but now it idles terribly rich, and it seems like the mapsensor is freaking out.
i have an a/f gaug on the narrowband lambda sensor. before i installed the ML the a/f gauge was pendeling. now its in green all the time.



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