My car seems to build boost slower than it used to, particularly in primary mode. I thought it might be a problem with the precontrol system so I unplugged the vacuum line going to the precontrol solenoid. This should have the same effect as running the precontrol at 100% duty cycle.

In 3rd gear at 2000rpms I went WOT. Boost initially rose to .83kg/cm2 and maxed at .91 around 3500rpms on my blitz digital gauge, which generally reads about .04 higher than the PFC. Frankly I expected it to hit 1.00 without a problem.

Has anybody else tried running the primary without the wg solenoid? How much boost is the primary turbo capable of generating when the precontrol(primary wg) is not diverting exhaust flow?-.91 sounds a bit low.

 

sounds like your turbo manifold is cracked on the secondary, causing it to leak into secondary turbo

make sense?

 

Even with turbos on their way out, when I had a split hose leading to the precontrol actuator I would overboost at the slightest provocation. It sounds like something may be off a bit.

I'm fighting a low primary boost problem right now that I'm reasonably certain is the CCV not closing properly, allowing primary boost to leak into the secondary chamber in the Y-pipe and thus out the CRV and possibly the secondary intake as well. My problem's a lot more drastic than yours, but if everything else checks out take a look at that...it could conceivably be open a crack.

jds

 

Yes. However, I looked at my turbo manifold 3,000 miles ago when I put in the new motor and it wasn't pretty, but there were no significant cracks. It's certainly possible that one could have developed recently, but I am going to chase down other less labor intensive possibilities first

Ah yes, I posted the CRV/CCA diagrams in your thread. It looks like the student has become the teacher! I'm going to replace all the IC pipe clamps this weekend. If the problem doesn't go away I'll remove the CCV acuator, wire the door shut, put the pfc in primary only mode, and do a few runs.

You mentioned your car overboosted when the line to the actuator was split. What kind of numbers did you see on the primary?

 

Yes you did thank you very much. I think your ASCII art generated more traffic than my questions

Since I was running the stock ECU at the time I didn't let it play out to see where it ended, but I hit 12 psi a couple times before lifting. It wasn't an obvious split either until I removed the line and looked more closely.

jds

 

If you are getting full secondary boost, then your piping and clamps are OK.

 

I don't seem to be getting full secondary boost.
I'm getting around the same peak numbers at transition, but I really have to kill it to see them. Previously, with the same intake temps boost would rise to .9 and stay there until transition where it would bump to .95 and then drop to .9ish until redline. On cold days I'd hit 1.00 and 1.05+ at transition. Now with the same duty cycle settings I see around .83/.9/.85.