Power FC What's a safe PSI with powerfc??
03-11-03, 11:48 AM
#26
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Originally posted by es
Mine was low & I had to adjust the offset to zero it out. I haven't tested the upper limit to my boost sensor though since I've only got ~560 miles on my new engine...
Mine was low & I had to adjust the offset to zero it out. I haven't tested the upper limit to my boost sensor though since I've only got ~560 miles on my new engine...
03-11-03, 12:16 PM
#27
Originally posted by skotx
That's very interesting. So you used the datalogit to adjust the offset to achieve zero kg/cm^2 with the key on, engine off? (This might be a common thing among datalogit guys. I just received mine recently)
That's very interesting. So you used the datalogit to adjust the offset to achieve zero kg/cm^2 with the key on, engine off? (This might be a common thing among datalogit guys. I just received mine recently)
If I Key on without cranking the motor the Commander boost pressure reads +0.00 Sometimes it'll read -.02.
03-15-03, 01:20 PM
#28
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Can I use the old AVC-R boost controller with the Power FC as I am going T04S single turbo now ?
If I only boost up to 1.00 bar can the Power FC control this boost setting without using the AVC-R ?
Thanks for your help guys !
If I only boost up to 1.00 bar can the Power FC control this boost setting without using the AVC-R ?
Thanks for your help guys !
03-16-03, 02:44 AM
#29
I haven't checked the zero pressure. I ordered a GM 3-bar sensor anyway, so I'll probably just install that rather than re-zero the stock sensor.
colin, you can run any boost controller with the PowerFC. I tried to use the stock solenoids to control the boost on my single, but it didn't work very well as I had it setup, so I just got an AVC-R instead of messing with it more. One of the challenges is that the stock solenoid is very small, so it doesn't flow much air. Aftermarket wastegates have longer hoses and larger volumes in their chambers, so the small solenoid may be ill-suited to control it. One option that I did not have time to explore was using both stock solenoids (WG & PC) in parallel to increase the amount of flow when they are open. You'll need to figure out if they should be connected to the stock harness normally, or perhaps both connected to the signal for the WG solenoid in parallel. I think you will also need to turn off sequential control in the PowerFC, but I am not really sure how that changes the PowerFC's control strategy. Those are all things you could play with if you are interested, however. It might work, it may just need more development. Here's how I hooked it up:
(boost source)----(stock solenoid)------(tee)--------(wastegate top port)
Connected to the (tee) in that diagram, I had a short section of hose with an orifice (Holley carb jet) to vent it. You need a vent to bleed off pressure when the solenoid closes. But the vent can't be too big or the pressure added to the line when the solenoid opens will not be enough to hold the wastegate shut. I initially had a large Holley jet, but the boost shot up very high (18 psi) right off the bat, so I just removed the hose with the jet from the tee (to give a really big vent), but after that, the boost would shoot up to 15psi at 5000 RPM or so, but quickly drop off after that, down to 11 psi or so at redline.
With this setup, increasing the duty cycle of the solenoid increases boost, which is the same control direction as the stock setup. You still need to hook up a full boost signal to the side port on the wastegate.
An alternate strategy that might work even better is to use the stock solenoid to vent (reduce) the boost signal to the side port on the wastegate. This would still ahve the right control direction (higher duty cycle increses boost). You would just leave the top port on the wastegate open (not connected to anything) in this configuration.
If you want to try this stuff, learn about how the wastegate functions and how other boost control systems operate. You will need this information to design a system and make decisions on how to tune it. This understanding is useful to have for any boost control system, whether it is one you designed or not.
-Max
colin, you can run any boost controller with the PowerFC. I tried to use the stock solenoids to control the boost on my single, but it didn't work very well as I had it setup, so I just got an AVC-R instead of messing with it more. One of the challenges is that the stock solenoid is very small, so it doesn't flow much air. Aftermarket wastegates have longer hoses and larger volumes in their chambers, so the small solenoid may be ill-suited to control it. One option that I did not have time to explore was using both stock solenoids (WG & PC) in parallel to increase the amount of flow when they are open. You'll need to figure out if they should be connected to the stock harness normally, or perhaps both connected to the signal for the WG solenoid in parallel. I think you will also need to turn off sequential control in the PowerFC, but I am not really sure how that changes the PowerFC's control strategy. Those are all things you could play with if you are interested, however. It might work, it may just need more development. Here's how I hooked it up:
(boost source)----(stock solenoid)------(tee)--------(wastegate top port)
Connected to the (tee) in that diagram, I had a short section of hose with an orifice (Holley carb jet) to vent it. You need a vent to bleed off pressure when the solenoid closes. But the vent can't be too big or the pressure added to the line when the solenoid opens will not be enough to hold the wastegate shut. I initially had a large Holley jet, but the boost shot up very high (18 psi) right off the bat, so I just removed the hose with the jet from the tee (to give a really big vent), but after that, the boost would shoot up to 15psi at 5000 RPM or so, but quickly drop off after that, down to 11 psi or so at redline.
With this setup, increasing the duty cycle of the solenoid increases boost, which is the same control direction as the stock setup. You still need to hook up a full boost signal to the side port on the wastegate.
An alternate strategy that might work even better is to use the stock solenoid to vent (reduce) the boost signal to the side port on the wastegate. This would still ahve the right control direction (higher duty cycle increses boost). You would just leave the top port on the wastegate open (not connected to anything) in this configuration.
If you want to try this stuff, learn about how the wastegate functions and how other boost control systems operate. You will need this information to design a system and make decisions on how to tune it. This understanding is useful to have for any boost control system, whether it is one you designed or not.
-Max
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