Hey guys I finally got a boost gauge on my car last Saturday and found out that I am boosting a prefect 5-4-5 boost pattern

I bought the car last August and I haven't noticed any kind of performance decline so I think it has always been this way...
Anyway, what do you guys suggest I do?

A friend and I spent the better part of the day( thanks John) trying to figure out the problem.

We tried to turn up the boost with a manual boost controller and turned it all the way up and no luck....
We tried to see if it was the double throttle and no luck....
With everything we tried I never got above 5 psi.
I tried to search and didn't find any helpful info.

Tell me what you guys think.

Thanks Justus

 

LOL, When you get it fixed your gonna be sayin "HOLY ******* ****, I HAD NO IDEA!!!"

You have a large boost leak somewhere in the system. I could be several things. One or several loose or blown off vacum hoses. A blown off or broken coupler ( very common at the y pipe) Or possibly a sticky actuator rod (doubtful)
I would check the couplpers first if that doesnt do it you need to go through and replace all the vacum hoses under the manifold. Sure neough you will find it then.
Good luck , If you need more help my AIM is FdTresBOOST
-Dave

 

http://www.autosportracetech.com/RX-...leshooting.htm

 

Where do you find all those cool links all the time?
Your a machine man i swear.

 

Yeah thats why I am not too bummed right now, and I thought this car was freak'n fast as it was!!!

I don't think it is a boost leak though. . .

From what I hear a boost leak this large would be pretty noisey, when we instaled the boost controller we took off all the intake piping, and I didn't notice any leaks.

The only conclusion that we could come up with is that my turbos are going out

Hopefully not but we checked everything we could think of and nothing seemed to work.

Mahjik I checked that link earlier when I did a search, and nothing on there describes my problem thanks though. . . .

BTW the only performance mods I have is a Apexi intake that was on the car when I got it.
Thanks Justus

 

I talked to the Mechanic at work today and he said that I might be getting this boost problem becuase of a clogged cat.
What do you guys think?

 

Possible, but I've never seen or heard of a clogged cat knocking boost all the way down to 5 PSI. Usually, people will see a little less on the primary and then lose more on secondary (usually something like 9-5-5).

It really sounds like something is malfunctioning in your turbo control system. Start with that page I posted above and verify all parts of the system are working properly (or print the page for your mechanic).

 

Could my wastegate be stuck open, so it is only allowing my turbos boost only 5psi?

Has anyone else had a similar problem?

Thanks Justus

 

Make sure you boost gauge is reading properly. Mine didn't and I thought I was running 9/10 lbs of boost--only 7lbs!

 

are you sure its no the hoses, i got 5 psi at teh last track event and found this as the cause, look down the thread:

https://www.rx7club.com/forum/showth...hreadid=204866

 

I am not "sure" it is a hose but from what I have been told, when there is a boost leak it is much louder than normal and would be noticalbe.
Damian- I had posted a couple comments on that thread awhile ago. How much louder was the sounds from the engine bay when you had your leak?
tbonerx7- I don;t have another guage available to check this one but I am going to try to find one and check it. . .

Thanks guys, Justus

 

sorry, didint follow my own thread lol...
i could not even tell at the track, there was no sound difference, only on teh way back during hard acceleration did i BARLEY hear a whooshing sound...above the bov/crv sounds

 

ohh, and my car was significantly slower at 5 psi, though still fast, it did not pull nearly as hard...

 

Thanks for the response damian, I will look at my hoses again and double check.
Justus

 

yep, good luck!!! hope it is a cheap fix whatever it is.... be sure to do the sqweeze test on teh rubber hoses, i looked at mine and they all passed the 'visual' inspection until i sqweezed them and the then the split appeared.

 

Was this how your car was when you bought it? Or did you feel power loss? I thought my car was losing power, but after a compression check and a dyno run, it was just me.

Even if you have to borrow someone's gauge, that could be it. Where are you tapping for the gauge? What kind of gauge do you have? I had some cheap autometer gauge that does both boost and vacuum. The vacuum numbers were off as well.

If you have vacuum numbers, post it. It's a sign of the health of an engine. I don't know the optimum number off the top of my head.

Damian's thread is pretty good. I looked at it trying to figure out some boost controller stuff.

 

It was my understanding that the precontrol door didn't (couldn't) open until the pri hit 7psi...therefore there should be no transistion (5-4-5)...I could be totally off here.

Check the IC hoses, mine busted a slit in the back and I couldn't find the leak for sometime...sneaky fawk!

 

damian: Have you replaced the IC lower hose? I've got an extra stock hose in pretty good shape. I'll let you have if you still need one. Just PM me.

 

Sounds fairly similar to the problem I was having. I was getting a 10-5-5 boost pattern that was due to some crossed solenoids... try this from the site Syder

Other Stuff

Wastegate and Turbo Pre-Control Solenoids

If you are getting a solid 6 psi from 4,500 RPM up, Check the electrical connections to these two solenoids, as they can get mixed up while working on the engine. From the front of the car, the right hand solenoid and the electrical connector of the engine electrical harness have a painted white dot, these two go together. Note that over time these painted white dots tend to dissapear.
To remove the ECU from controlling boost, simply unplug the electrical connectors for both of these solenoids, (as per above note which connector goes where). You should get about 7 psi of boost, if not then you have a boost leak, exhaust leak, or a problem with the Wastegate or Turbo Pre-Control actuators.

EDIT1: According to that site you shouldnt be getting a transition unless youre getting at least 8psi, so maybe your gauge just isnt reading right?

EDIT2: and like everyone said, after fixing the problem the car pulled harder than i ever thought it could.
That transition is awesome.
-stephen