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Silly boost question.

Old May 8, 2013 | 01:37 PM
  #1  
HeyCesar's Avatar
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Default Silly boost question.

Is boost supposed to immediately be at 100% or does it climb up to it?
Here is what I logged using Torque Pro with a bluetooth dongle. I have a smooth idle, and it stays at about -24mmHg. My car is chipped with SpeedTuning and have DV from Krauto.

Another thing, I bought 12' of 3.5mm ID silicone hose to redo my lines but the only braided lines I found and replaced were the FPR-Manifold and DV-Manifold. Which are the other ones that I can replace with the 3.5mm? I have an AEB.


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Old May 9, 2013 | 03:09 AM
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Originally Posted by HeyCesar
Here is what I logged using Torque Pro with a bluetooth dongle.
i have no idea what that is, but im guessing its some gimmicky iphone app or something for your laptop. so, in other words, junk.

boost is load dependent. smaller turbo + high load = high boost at low revs, lower boost at high revs. big turbo + high load= low boost at low revs, higher boost at high revs.

i could go on and on, but basically, no, you will not get 100% boost at low engine load on any turbo. even a k03 has a spool time. when guys say they spool instantly, they really mean they spool very fast, but the turbo cant keep up with the engine's air demands at high revs/high air consumption, so boost drops off. the engine is eating the air faster than the turbo can supply it.

what im getting at is that "torque pro" is flawed. it doesnt account for engine load. notice how line 17 has 5psi more than line 30, yet 1000 rpm's less? its because the load was less at line 30 than line 17
 
Old May 9, 2013 | 09:37 AM
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Thanks for the response. The Torque Pro app takes information from the cars sensors. It can also log engine load along with other information. I just thought I should be spending more time in the teens with the tune. Maybe I should get a mechanical boost gauge to monitor the boost instead?
 
Old May 9, 2013 | 04:59 PM
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Originally Posted by HeyCesar
Maybe I should get a mechanical boost gauge to monitor the boost instead?
bingo. that wont lie to you
 
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