RomRaider

I have not seen TGV tables to understand the logic behind their operation. Many people have said they are only used at idle during cold starts, but I wonder if they are used at idle at normal temp as well. I also wonder what they define as idle, below 1000 RPM, below 2500 RPM etc?

Do any of the more experienced members know what the strategy is for an 05 WRX? I assume they were closed below a certain RPM and perhaps only below a certain coolant temp? I also assume there was a dashpot effect between closed and open RPMs to prevent hunting etc. Has anyone seen the tables (for a 16 bit 05 WRX) and if so can you provide the logic for opening and closing the valves. (ie closing RPM, opening RPM, if there are coolant or intake air temp thresholds that modify their operation etc.)

I searched and found this post http://www.romraider.com/forum/topic3386.htmlthat talks about the TGV use being extended on the 07 Legacy, but I am curious about the non extended operation on a 05 WRX.

I removed my TGVs before I converted to Rom Raider/OS. On the previous software I was using (Cobb) I could not log TGV status. I noticed that it is possible within RR to log TGV status. If the experts do not have access to the TGV tables, can someone with TGVs still installed log when they are opening and closing.

I no longer have them, but I did log them a couple times back when I had them. I have an 05 LGT, by the way.

They would stay in the closed position until I touched the throttle, at which time they would jump to the open position and stay there until the next cold start.

Merchgod, if you find the time to investigate this logic, I'd love to see any tables added to the definitions... Those of us who have removed the TGV hardware could then find out if we can re-purpose the actuators to do something useful, like controlling a meth kit, or (more likely) IC sprayer.

When I did my engine work I removed the butterfly values and smoothed out the TGV bores but I left the actuators, rods and sensors in. I therefore should be able to log their operation even though they really have no affect on my car now. The temperatures here are down around 5-10C in the mornings so I suspect they should be active.

What would I log, what sequences of startup and throttle control would be of interest? I could report back once I have some info.
Dale

I would log:

Engine Speed (RPM), Coolant Temp, Intake Air Temp, Tumble Valve Position Left, Tumble Valve Position Right

Start the car after it has sat for a while and let it idle while logging. After 30 seconds or so, slowly push the gas to rev the engine to about 3,000 RPM, then slowly come back down to idle.

Thanks,
-Joe

Here you go. It appears to be digital; close or open.

Thanks a ton!

From that log it sure appears that the TGVs are only closed at idle on startup. It looks like they opened once you touched the throttle and stayed open after you lifted off. even when you came back down to idle.

I really appreciate you logging this for me. Everyone said that is how they worked, but it was hard to believe that all that complication was put into the engine for a few seconds of use per ignition cycle. Damn startup emissions requirements.

You have already done enough, but if you have time I would be curious what would happen if you drove the car around until it was at normal operating temp, shut it off and restarted. Would the TGVs close again at startup, or would they stay open? If you don't have time to look into this it is cool, it is mostly a curiosity now that you have posted your other log.

One other quick thing, what year / model is the car?

Thanks again,
-Joe

Yes while I was watching the logging data I saw the TGV voltage drop from 5V to 0V the instant I touched the throttle. Sure I can do another log. I'll do it after a drive to work, then shut the engine off and restart it.
My car is an '05 OBXT.

My 05 LGT behaved exactly the same way when it had TGVs. I read a while back that newer cars use the TGVs under other conditions as well but I haven't heard any details.

Okay here is the log for a warm start. When I arrived at work I just shut down the engine (key to off) and restarted before the Logger timed out. So you'll see the RPM go from idle to zero and then through startup.