i have a 97 a4 1.8t has had running issues for a while have replaced fuel pump,fuel pressure regulator, n75 valve because some threads i read but still lags real bad so i purchased a boost gauge at idle it reads 20 and when i floor it it jumps to 0.00 lol no boost? sucks i was wondering if i put it in right i installed it between fuel regulator and intake manifold do the readings sound accurate maybe turbo or vacuum? how do i figure it out what do i check dont wanna buy a turbo and have it just be vacuum...any help
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run a boost leak test first. i installed mine on the vaccum hose going to the intake manifold on the front side of the car

 

ok so im going to get that tester but i had to order it now does that vacuum reading sound normal 20 inhg or is it supposed to be 10 ans also if the turbo was bad shouldnt it still make some sort of boost or nothing?

 

Why order a tester? You can make one for <$15! Check out the DIY section.

 

Your gauge is hooked up right.
We have a 0 boost situation going on in another thread.

CHECK IT OUT

A boost leak large enough to produce 0 boost at the manifold would cause your engine to hardly run at all. If there were a leak and the turbo was trying to work, you'd hear it.

 

yeah. 20 is fairly fine on the vacuum. mine is like 23 and 24

 

ok so more or less my turbo is no bueno?

 

Well i have some one who claims they can rebuild my k03 and modify it but ive never heard of it wouldnt know what chip to use according to him it will run me 3-400 dollars where a decent k04 is about 6 or 7 right? Would it be worth tryng to rebuild/modify a k03 i guess hes going to use parts from differnt turbos? Any suggestions

 

Did you read all the replies in the link I posted? I don't know how you can just assume that the turbo is shot without doing some real diagnosing.

 

^^^+1