With all the posts regarding low secondary boost patterns, many forum members have corrected their issues and regained proper boost from the secondary turbo.

I'm curious to hear just "what" the solutions/problems turned out to be.

Maybe if we get enough feedback, there can be a clearer picture of what the actual causes and solutions have been.

So, if you have had a boost pattern problem with your secondary as the issue, what did you find and how did you correct it? And, how long so far, has the correction worked?

Thanks for any input.

 

10-5-7


replaced most everything. no clue, no fix in sight. im gonna try to enlist of some local area help.

 

Low secondary boost and boost pattern problems are two very different issues. Bottom line there are indeed a lot of vacuum/pressure lines, solenoids, check valves, actuators, pressure/vacuum storage tanks, plus a CRV and blowoff valve (not to mention the turbos themselves or pressure leaks, etc.) The good news is that how they all work and how to trouble shoot the entire system can be found in these threads! It's an amazing system when working properly!

 

^sounds wonderful!!! .......but ive never seen it working properly! lol

 

Still, many forum members have had problems with their secondary turbos boosting and quite a few of them have figured it out and corrected the problems.

I'm just curious as to what they finally found and corrected.

thanks

 

1. clogged cat
2. CRV (or was it BOV...) hose had hardened and split
3. torn/loose coupler

 

Hose popped off the pressure chamber.

Dave

 

gracer7-rx7

Was it all of those or did you address all three and end up back in line?

 

10-8-5 - check valve got disconnected.

 

10-3-10.....def something prespool but i have yet to fix it

 

Anyone else conquered their problems with the Secondary boost?

 

10-5-4

Did a complete vacuum hose job. Checked each solenoid. Replaced check valves, tested the vaccum and pressure chambers, replaced the WG and Pre-control solenoids, and while I was in there replaced the FPD and had the injectors cleaned and balanced by RC engineering and installed Damiens's manual boost controller set up. Problem solved.

Recently replaced stock ECU with PFC and lost my secondary boost again. Went through all of the Autosport site checks and it was good such as KOKO test, actuators, CRV, pressure, vacuum and pressure checks. I will have to figure it out this spring when I get her out of winter storage. I plan on checking the solenoids again and double checking the harness wires I cut for the Power FC.

 

my buddies 93 is having the same 10-8-5 BS... His second turbo was blown so we thought hat was the prob, replaced the turbos, but the problem is still there.

 

10-0-0
I had 10 pounds till the secondary should come on and then it would literally flat line. checked all vacume lines, solenoids, actuaters, everything. Finally found the problem to be a clogged main cat. I got my boost back up just by unbolting the cat from the pre-cat. Once I replaced the cat and put on a DP, back to 10-8-10.

 

well my secondary is fine, but primary won't hold.
7-5-12

 

Does the vacuum reading tell anything about the turbos? Seems like it would rule out vac leaks if the vac reading is strong when not under boost, Right?