I bought this car with aftermarket parts already installed.
I have fixed some of it up to stock and now I currently have:
Pettit ECU
Fluidyne Radiator
Stock intercooler (Originally PFS intercooler)
M2 intake
HKS downpipe
Stock exhaust and cat (Originally just a straight through)
Greddy Profec Type S (at factory setting)
With these I am getting around 19(18-20) psi. Is this normal? Isn't supposed to be around 10-12 psi? Is it because of the Greddy Profec? Pettit ECU? Correct me if I'm wrong. Comments and feedbacks also needed. Thanks for everyone's time.

 

NO!!!! please stop boosting that high on your setup up because your going to blow it! the twin and stock intercooler are not designed to be run at those pressures not to mention that your ECU was not designed to run that either. You need to check what your profec is set at and turn that damn thing down to 10 psi. i dont wanna see another "my engine blew thread "

 

I already set the Profec to the lowest, but its still so high. Would it help to put the stock ECU on with the boost controller?

 

Please help me. I need help getting it back to 10 psi with this setup.

 

look for a rotary specialist in your area... IIRC there is one in the bay area

 

So I guess this problem is not a simple one. Can anyone here from the bay area look at my car to help me out?

 

Wow 20 PSI!!?!?! Firstly where are you reading this off of? I didn't even know the stock turbos could produce 20PSI... Check your gauge somehow. In any case, if you have a profec S and it's not controlling your boost, and it really is at 20PSI, then you have more complicated issues, impossible to diagnose without seeing it. I'm definitely not an expert, but there are plenty of people and a few shops in the bay area that would definitely know. How long has it been boosting at 20psi? Also why did you put the stock intercooler back on? The PFS is a good intercooler.

 

I want to get the car back to stock. Would I need to remove the boost controller? I think it is reading at 18 psi, but it bounces in between 18-20. Any shops in the SF area? I don't want to take it too far in case something is serious.

 

First, I would verify that whatever you are using to read your boost is accurate. Check the line to make sure it's not pinched or kinked. You can also check it with a MityVac.

If all that is ok, check how the Profec is installed at the wastegate actuator. It sounds like it's not installed properly.

 

sounds like you want to fill your turbos with shrapnel.

 

The car revs smoothly to 8000 rpm and the boost gauge reads 18 psi while your foot is to the floor?

 

Here is my number, 865-385-5622, you will need it shortly. I have a feeling either the boost controller is routed wrong, or they somehow left the boost restrictor pills in line.

Remove the two lines coming off the primary turbo compressor housing and run new line directly from those two nipples to the wastegate and precontrol actuators.

 

Rick's Rotary is a reputable shop in the bay area. Call them. I don't have the number.

 

With a stock catalytic converter,with the catalyst bricks still whole,and stock turbos you cannot boost to 20psig---I have BNRs,HKS downpipe and RB cat back and cannot make that kind of boost.Your boost pressure monitoring system has to be defective.

 

Alright so it wouldn't hurt to take it out for a test drive right? I'll let you guys know. Might be something wrong with the gauge or boost controller. We'll see what's up.

 

I don't think that's correct. The stock system can't provide enough fuel to run 20psi at high rpm, but it can certainly do it at low rpm.

 

If your in the south bay Rotorsport in santa clara is a good choice.

 

ok i don't think that's boost gauge problem.....but check it any way

my car got full 3" exhaust ,high flow cat , airinx intakes, pulley kit

stock twins

and i was boosting 20psi at like lil bit more then half throttle 1st 2nd--->5th gear

there is a temporary solution for it or u can keep it like that if u don't plan on further modifying your car


u just need to pull off a line in the back of the wastegate and block it of
and this will keep u at stock boost levels no meter what mods u got

her is a pic of what u need to do....i did this on my car as i got to many modes and i didn't get PFC

the line u need to unplug is marked red.... plug both sides wastegate and rubber hose u pull off


http://img199.imageshack.us/i/img0070ksz.jpg/

all so u might wanna take out boost controller and just run open line to your wastegate with some clamps u can all so see that line in pic its on the front of wastegate and it unmarked in that pic

if your boost stays from 7psi to 10 at max.... it mean that your wastegate is working
it a bad solenoid or loose vacuum line or ruptured one

 

Thanks for all you help. Before doing the last thing that was mentioned, I took it out for a short drive. The boost gauge went from 2 to 12 psi when accelerating and 18 to 20 psi at idle. Was out for a 15 min drive around the city. Other than that the drive seemed smooth. Any comments on this?

 

18-20 psi at idle!?!? There MUST an misunderstanding in here

You mean 18-20 inHg of vacuum!! Let us know on what you get those numbers and post a pic
Ex: pic of your boost gauge on WOT or at 18-20 "psi"

 

JDMinard i think u are right he doesn't know how to reed a boost gauge

your vacuum should be from 18 to 20

and under WOT u should be at 10 psi

and if your car went from 2-12 psi you are ok u don't need to worry about any thing that normal with the modes u got

if u are getting the boost not the vacuum at 18 and 20 psi what i told u in the earlier time do that before u blow it
also u would have reached fuel cut at that kinda boost

so i think u just fine

 

Oh yeah, put the pfs intercooler back in, i dont know what mazda were thinking when they made the stock one, but it sucks.

 

I'll get a picture of the gauge at idle. Later tonight or early morning. At work right now. Pretty sure I'm reading it correctly. But I might half asleep like always when looking at numbers.

 

This is what I was getting at back in post #11.

You're reading 18 to 20 inches of mercury at idle, which is actually very good. Your peak boost is 12 psi, not 19 as the thread title suggests.

 

sounds like you are confusing boost with vac. right side of 0 when boosting. left side of 0 when at idle?