I just install boost gauge in my car and just want to see if im getting correct reading.
didnt push the car all the way(only around 5k)
3rd gear it was about 15psi
4th gear it was about 20psi top

when its idle, i get like 15-20 vaccum and around 3k it goes to 0(turbo lag till 3k right?)
also pressure dropped really quick right after I release the gas. Is this right?


thank you

 

Should peak around 19psi and taper off to redline. Should be ok.

 

sounds fairly normal my vacuum is always 18-19 though not 15 and was 19 psi in 3rd gear when i was stock and 21 in 4th

 

You should verify what your peak boost is in your top two gears...especially 5th(or 6th, if it´s a 6-spd.). You´ll need tò push the car a bit more, as in doing a wide open throttle run. Take it up to at least 7000 RPM in 4th gear at WOT. This will allow turbo to creep or taper. I think that on IX´s in general, the boost from the factory is set a bit above 20 PSI.

 

isnt factory set up at 19psi? I think i read that in magazine somewhere(they had evo for their project)
need to push more to test out but new to town and no radar =(
no ticket no warning for last 8 years and trying not to get it with new car =D

 

You´re probably right on the factory boost setting for a IX. I really wouldn´t know as I drive an VIII. You can get a better idea of what your peak boost is, without having to reach such a high road speed if you floor it on an uphill slope in 4th.