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tsi people. when does your t25 start spooling, and build boost??

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Old Apr 26, 2006
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tsi people. when does your t25 start spooling, and build boost??

at what psi does it start to build boost?
today i kept my eye on the gauge and slowly raised rpm but it never even went to 0 out of vacuum. then from idle i floored it real quick (to 3k)and the needle was going to 0 but i never really saw it go past that.
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Old Apr 26, 2006
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With out load your turbo wont get into boost. Read - idle.
When moving I get full boost - 9psi/t25 @ 2500-2700 rpms.
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Old Apr 26, 2006
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so just sitting there revving it, not even at wide open throttle i shouldnt expect boost at like 3k?
ive never driven a car with a gauge so this is sumwhat new to me. and i thought this was correct but with a guy coming to tune my car i wanted to double check with you guys.
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Old Apr 27, 2006
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the t25 spools at about 2500 rpm and if your applying throttle

and if your not going above 0 psi then you have a pipe loose somewhere start checking them all

Last edited by eye_see_you; Apr 27, 2006 at 04:06 PM.
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Old Apr 27, 2006
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You need to load the engine for it to build boost. You can't make boost in neutral.
If its not building boost while moving, or building it very slowly, check to be sure the WG flapper is tight, and check all the couplers.

Last edited by Boilermaker1; Apr 27, 2006 at 04:07 PM.
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Old Apr 27, 2006
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Originally Posted by Boilermaker1
You need to load the engine for it to build boost. You can't make boost in neutral.
If its not building boost while moving, or building it very slowly, check to be sure the WG flapper is tight, and check all the couplers.
You need load.





SO MANY PEOPLE THINK THEY DO NOT NEED LOAD TO MAKE BOOST, BUT THEY FORGET TURBOS ARE EXHAUST PULSE DEPENDENT. There are minimal pulses at neutral, all of the pulsing is made during load while driving.
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Old Apr 27, 2006
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Thank god you dont need load for the BOV to work!
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Old Apr 27, 2006
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yea thanks guys, i found a pipe actually disconnected cus some guy at the shop thought it was hitting the crank so he moved it. its good now.
but the tuner tried tuning it and weve got fuel issues with emanage, id appreciate your help in that thread in FI.
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Old Apr 27, 2006
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I know you can't build boost without a load, but how does a 2-step work then?
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