where did my boost go ???? :(
 

iam using a ihi rhb5 on my d16z6, ive been runing it on 7 psi and its been sweet for like a month
and then yesterdaynite my boost wouldnt go above 4 psi ! and it takes forever to get there .
its gets to 4psi and then just stays there on full throttle. i took the mbc off the turbo and still no change.

i have no leaks , i check all my clamps , my intercooler is fine,

what can it be ??

btw ive still got normal spark plug ( iam about to get a step colder ones )
could it be my exhaust coz ive still not decated my car...
my spark plugs are charcoal black with a white tip ( iam guess thats bad )

on my vafc sitting ive got it from -39 across to -37 , iam using 450cc injectors.

Re: where did my boost go ???? :(
 

check all your silicone couplers. I had that problem once, and it was on the back side of a coupler.

Re: where did my boost go ???? :(
 

boost leak or stuck open wastegate

Re: where did my boost go ???? :(
 

waste gate prob, or boost gauge prob

Re: where did my boost go ???? :(
 

it cant be my boost gauge because ive got a pressure reading on vafc which is the same
as the reading on the boost gauge so i know its not that. ive checked for leaks but i didnt find any,
i removed my mbc and took it for a spin and its that same, as in it only goes to 4psi and stays there
does'nt get any higher than that. if the wg was open wouldnt i get high psi ?

Re: where did my boost go ???? :(
 

no, you would get more boost if the wg were stuck , not allowing pressure to escape. try and clean up the wg flap. I take it , its the stock internal wg your refering to

Re: where did my boost go ???? :(
 

Check/change the vacuum source for the wastegate.

Re: where did my boost go ???? :(
 

pull the line of the wastegate and go for a rip, watch that boost gauge though.

Re: where did my boost go ???? :(
 

^^ I would try doing that, but REALLY watch the gauge... if it goes over your 4 psi threshold, you've found your problem.

Re: where did my boost go ???? :(
 

^^^^ i did that and still no difference, still does up to 4psi and stays there.

i tired to put the boost lower on the mbc to see wot happens but it still went to 4 psi wtf !

ive got one line runing to my actuator and one to the turbo, i was told that how its done,
i hope its right. but it seems my mbc aint even working. o even swaped the lines but still
no difference.