Ok, since i got the car the stock boost gauge has been off. It would slowly go up but i would never get out of vacuum, so i assumed that it was broken. My car has slowly been losing its kick it seems as i've been driving it, i lost to my friend's bone stock 240sx the other day, he walked me badly and i didnt even launch that bad. My car barely has its turbo kick anymore it seems. Anyways one day I park my car, and rev the engine and i notice the boost gauge shows boost building even at idle. THen i take the car out and its a whole new beast definitely boosting. Anyways last few times i've driven it its gone and it feels like an n/a again.



What could this be? Clogged cats? Some sort of weird wastegate problem?



I have no performance mods however i do not have emissions, p/s, a/c or any of that other mumbo jumbo. The car is an 89 t2 and the stock boost controller has been removed with the rats nest and the nipples capped off. However the vacuum line still goes from the compressor side of the turbo to the wastegate but the T part of it has been capped.

you have the cats still?

Yessir, still have cats.

how many miles is your car again?

i would get rid of em, without the airpump they arent working right anyways and they can cause boost problems

A boost/vacumm leak will make it feel like na too.

I've got 72k miles, the first thing i checked was the vacuum lines and my intercooler stuff but I guess i can check again. I would get rid of cats but i wanna awit till i get a new exhaust instead of just having someone weld on one for cheap because then the bolt up part of my exhaust goes away and its a nasty permanant weld thing.

So, how do you control boost? https://www.nopistons.com/forums/pub...IR#>/blink.png

I'm not sure but i think that makes my car just like a s4 and i boost 5.5



When i put the mbc in my car i was only boosting 5.5 and even if i turned the knob my boost wouldnt go up anymore than 5.5. The controller was awkward, in a bad spot, and i couldnt figure out how to use it so i took it out again.

Check your wg actuator. doesnt sound right https://www.nopistons.com/forums/pub...1047683561.gif

How do i do taht and what do i look for?



Previous owner took the mbc out to help break the engine in.

Load up the actuator rod with hi temp grease, go for a ride with good throttle but dont let it get too hot cause the grease will fall off. Come back and see if the grease moved. if not you have a problem.

wastegate problems or boost leak.. cats can hurt u too.. u should be killing 240sx's ****.. i bury them with my na...check ur vacuum lines...u should be seeing at least 6,7,8 pounds of boost for starters

Another thing i noticed is my car gets more kick and the boost gauge works after you drive it for a long time. Like 45 minutes +