I got VVT Working !!!!
#1
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I got VVT Working !!!!
A little background for those that don't know. my car is a 96 with a 01. I tried getting it running with the 01 sensors so I could go PID VVT control. that didn't happen. so I decided to run the PNP harness and open loop VVT control. well I have had issues with that too. But now its all working great.
…. I GOT VVT WORKING!!!! WOOT!!!!
It was a ground issue the whole time. there is a 6 pin plug with 4 outputs and 2 grounds. I traced the wiring back and I had the right wires. But when I checked the plug, only one of the two grounds was working. So I tied them together, went for a drive to try it, VVT BABY!!!
I knew it would be something simple once I figured it out. I been trying to chase it down on the laptop forever, and I finally realized it must be a problem at the solenoid. 10 minutes with a $3 test light and problem solved.
And I am proud of myself for this little trick I figured out. Rather than use the open loop VVT function based on RPM, which would advance the cam at a given RPM regardless of load, I used the wastegate output. It’s meant for turbo’s, but since I don’t have one…. it allows me to set VVT (or duty cycle) based on RPM, but also has a minimum TPS and Min MAP settings. So it will only advance the cam at full load. I set for >50% TPS and >90kpa MAP.
When I first stomped the gas out of the neighborhood it was obvious. Whoa, amazing!!!
Now I can’t wait to put a loud shorty exhaust on the car and get back to the dyno and dial it in again.
…. I GOT VVT WORKING!!!! WOOT!!!!
It was a ground issue the whole time. there is a 6 pin plug with 4 outputs and 2 grounds. I traced the wiring back and I had the right wires. But when I checked the plug, only one of the two grounds was working. So I tied them together, went for a drive to try it, VVT BABY!!!
I knew it would be something simple once I figured it out. I been trying to chase it down on the laptop forever, and I finally realized it must be a problem at the solenoid. 10 minutes with a $3 test light and problem solved.
And I am proud of myself for this little trick I figured out. Rather than use the open loop VVT function based on RPM, which would advance the cam at a given RPM regardless of load, I used the wastegate output. It’s meant for turbo’s, but since I don’t have one…. it allows me to set VVT (or duty cycle) based on RPM, but also has a minimum TPS and Min MAP settings. So it will only advance the cam at full load. I set for >50% TPS and >90kpa MAP.
When I first stomped the gas out of the neighborhood it was obvious. Whoa, amazing!!!
Now I can’t wait to put a loud shorty exhaust on the car and get back to the dyno and dial it in again.
#5
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Its working in open loop off the wastegate output. Duty cycle per RPM, and min is 50% TPS and 90kpa so it only comes on on load. However I think I may drop the kpa down to about 60 so that it will stay engaged in slolams and such. the main thing I want is for it to not advance while moving around in grid and cruising and such.
Here is a screen shot of the setup. If you set all the PID values to 0 it goes open loop. And I am feeding it 12V, 3A, at 250Hz. nothing really happens until ~ 60% duty cycle. so its coming on at 2500 , full advance 3000-4500, then tapering off at 5000.
Here is a screen shot of the setup. If you set all the PID values to 0 it goes open loop. And I am feeding it 12V, 3A, at 250Hz. nothing really happens until ~ 60% duty cycle. so its coming on at 2500 , full advance 3000-4500, then tapering off at 5000.
#8
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I set it at 25% TPS and 60kPa min's. that seems to be working great. I can cruise at 80mph on the interstate without it kicking in. it only kick's in when passing and such.
also, note the TPS X DC. That will ramp the load when applying throttle, so it doesn't og rapid advance (unless I am at 3500 and just hammer it)
Working great so far, I am happy. Going to try to get some video this weekend. FYI car sounds awesome too.
also, note the TPS X DC. That will ramp the load when applying throttle, so it doesn't og rapid advance (unless I am at 3500 and just hammer it)
Working great so far, I am happy. Going to try to get some video this weekend. FYI car sounds awesome too.
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