Hello,

My boost Fluctutates, i do not get consistant 14PSI From Full boost [4500-8200rpm].
It will go from like 12-13.9 and not hold at 14PSI.

I do not have a boost controller, only a 14psi spring in my Tial 38mm Wastegate.

My Setup is a B16a Built motor, Srp 8.x:1 Cr.



Anyone has any info that could help me?

 

you sure you have a 14 psi spring?

 

almost positive

 

wheres your source for the wg?

i would double check what spring you have. a lot of times itll creep a little so youll run a little more boost than the spring. you usually cant run anything below the wg spring rating.

 

sounds like a 12 psi spring with a little bit of creep.

 

source is Intake Mani, shared with bov

 

What brand BOV do you have?

Does it build boost consistently or does it jump around?

 

It jumps arround, BOV is TIAL

 

i have used a 10lb spring in my old wastegate.
i bought a new wastegate and put that spring in it now i get 8-9lb....
weird

 

Ive had the same thing happen to me with a Tial BOV. Take it apart and rebuild it. Clean it out and lubricate it. Then test it out, see if it fixes your problem.

 

IMO the bov should have its own dedicated vacuum course off the manifod for proper operation. Ive teed off other things for a line to my bov and it always gave me weird issues.

That also wasnt just on one specific bov, i always had issues witou a dedicated line to the bov om a greddy type rs, Turbosmart megasonic, tial and now my turbosmart racegate bov. and when put on a single dedicated line they all work flawlessly

 

like i said the first time, double check the spring and get back with the color.

also check what spring is in the bov.

 

Mine is a single dedicated line.

 

I love your sig psychoteen!
lmfao!
Im gonna guess a sticking/slow responding wastegate?

 

^^That or the BOV is what im thinking.

 

Where else can i put the Wastegate line?
There is only one port on the Manifold!

 

what manifold do you have? there should be more than one port.

buy a vac box and tee it off the big brake booster line that way you have multiple ports you can use and its off a big line so you shouldnt have any problems. thats what i did for one of my cars. no problems after 3 years.

 

^yeah..especialy if you trying to be clean about things...and you weld all the ports closed on the intake mani.....

 

Tapping into the intake manifold and threading in a fitting isnt very difficult.

 

toward the outlet of the turbo, drill a hole and tap it and put a fitting on there. thats is the best place to get a boost feed for the wastegate. typically though if you have a good intercooler you will see a 1.5-2 psi loss. so if your running a 12 psi spring you would see 10-11 psi of boost because the gate still opens up at 12 psi but the intercooler restricts somewhat

Im running a blox intake manifold same as skunk2 and i use the front nipple for my bov, the rear nipple goes to the brake boost and a vacuum manifold for boost gauge and little things. the WG is hooked to the outlet of the turbo as i just described as well as my boost controller. works flawlessly

 

im having the same prob, i bought a 9lb spring and am only seeing 7psi. Would I need to buy a 11.6lb spring to see 9-10psi?

 

I *think* i found the problem,
The Bolt that goes into the Barb Fitting was a Smaller BOLT.
I thus changed it to an original Bolt, Hopefully this was the problem.
Is that a possibility?
I will have to datalog to see.

 

if you are running the boost feed form the turbo to the wastegate then yes you will need an 11 psi spring to get roughly 9 psi at the intake manifold. or just get a good mbc like a turbosmart and a few clicks will accomplish the same thing

 

Barb fitting on what?

 

Thanks bra, i appreciate it.