My turbo control actuator gets stuck on and my charge control actuator stuck off below 4500 after going from 2k to 7k under boost, but when the rpms drop to 2800 it goes back to normal immediately every single time. What is so special about 2800rpms? I've been chasing this bad boy down for awhile now. If I don't solve the problem w/in the next 2 weeks I'm seeking professional help.

-Chris
ps-I learned they were getting stuck by watching the switch function on the power FC commander.

 

I'm not sure how the PFC handles it, but when you are punching it and are at high rpm, shifting to the next gear will usually keep the sequential system running both turbos.

If you a mildly driving and you shift under 4500rpms, then the sequential system should only keep exhaust going to the primary turbo.

Have you checked in the Commander to see if the transition RPM for the turbo was changed? I don't even know if the PFC allows you to change that.

 

You can adjust the switchover point with the PFC, but you need the Excel software to do it. I noticed this problem with the stock ecu as well. The fact that it stays "on" even while cruising around at light throttle for extended periods of time, rather than just for a few seconds when I'm wailing on it, leads me to believe that it's not functioning properly

 

CCarlisi,

Just thought I would respond to make your day. What you are describing is perfectly normal. 100% normal. I have heard ranges from 2800 to 3200. Particluarly my car is at about 3k. Once you initiate the dual mode by spirited driving and greater than 7psi in primary. the car will stay in dual mode for a controled length of time, OR you go below 3k rpm. this is designed so that if you shift and catch the next gear at m aybe 400k it doesn;t witch back, just to have it switch again. I like the system. stop troubleshooting your car is fine. Although 2800 is a little low, I am sure it is fine.

 

Thanks for the response, but I think you're WRONG. I find it hard to believe they designed it to deliver ZERO boost below 4500 everytime you shift-that would be a punishment! Dave at KD also believes that this is not "normal."

 

you didn't say anythign about zero boost, and maybe you are shifting too early. furthermore, the zero boost wouyld be a problem all by itself. the car does stay in dual mode like I said, 2800 is a tad low. With zero boost you have problem, but if KD rotary is telling you that you can't have dual mode excet over 4500rpm then he is wrong.

 

my objective is to determine what causes the Charge control valve and the turbo control actuator to switch btwn seq and non seq. Whatever is causing my problem is effecting both of these components at the same time(or alternately the malfunction of one is causing the other to malfunction). This is preventing me from developing any boost between 2800 and 4500. As I said before if I drop below 2800 the CCA turns on, closing the CCV and at the same time the TCA turns off closing the turbo control valve. Alternately when I hit 4500 they remain in the same position, but boost immediately recovers.

This has led me to believe that boost is being vented through the CRV below 4500, at which point the CRV is open and the CCV is supposed to be closed. With the CCV stuck open boost from the primary may be washing back down the 2ndary pipe out the CRV instead of to the IC, but at 4500 this wouldn't be a problem b/c the ECU closes the CRV.

Because the CRV doesn't appear to be effected, I believe that the CRV is controlled independently of the CCV and TCA, both of which seem to operate in unisine. Since the CRV is working correctly I believe whatever controls the switchover of the CCV and TCA is responsible for the problem. I'm hoping that once I determine what is happening at 2800 to cause it to switch over, it will lead me to the answer.

Any thoughts?
.

 

ok, let's work this out. are you only not getting boost between 2800-4500 after going into dual mode, ie after a high run to 7k . or do you get no boost from a start say you are in 2nd rolling at 1500, and floor it, do you get the right boost pattern?

THe TCA, adn CCR lights you see on the PFC are for the selenoids only, the ECU will switch them based on a variety of conditions, ie RPM, boost, etc. THis does not mean however that the actual actuators are working. As you said when dual mode engages CCR opens (lights goes off) and TCA switches, light on. these too surely signifiy dual mode, furthermore, without clarity on you boost characteristics, I do know that the CRV, get's it boost from the CCR selenoid indirectly. tehy are related, becasue all these things happen at exactly the same time. I am just throwing out some info hoping it will be useful to you. Tell me what is happenign exaclty to your boost again, I will try to help.

 

oh yeah you asked whatis so special about 2800rpm, well around 3k the follwoing things happen. secondary injectros come on, TPC begoins to sp0ol up secondary (CRV shoudl stay opne aty this point). and dropping below it will disengage dual turbo mode.