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.

Re: where did my boost go ???? :(
 

ohhh btw , this happened after i went for a 70 mile dirve , at first i thought one of my
charge pipes came off , but that wasnt the case.

Re: where did my boost go ???? :(
 

weird it happened after a trip like that... Are you 200% sure it's nothing to do with the piping? THAT'S THE EASY ANSWER... WHY CAN'T IT JUST BE THAT!? Check it 4 more times, just to make me happy ;)

Re: where did my boost go ???? :(
 

ok jus for you iam gona take my intercooler and piping off and check them properly ,

i took my car to a place called "turbo developments" and the guy goes it looks fine (the wg), its opening
and closing fine, but he said to take the turbo off and bring it to him for a closer inspection

can it be my exhaust ? it sounds blown.


i jus love the problems of a tubro ;D