I have a 20v 'silvertop' 4AGE that I'm putting in a Lotus 7 replica and I have a question about actuating the variable valve timing (VVT). Not sure I really *need* to do this for the best performance but it's an interesting problem. Apprently, the VVT is actuated at somewhere around 4500RPM and I'm wondering if anyone has any ideas how to actuate it?
It seems that there are two wires, one is a + voltage and the other is switched the ground via the ECU at the target RPM.
I suppose I could use one of the programmable outputs but I'm not sure if they're compatible nor how to wire it if they are. Any ideas?
-Steve
20v 4AGE variable valve
Moderators: JeffC, rdoherty, stieg, brentp
Yes, that's exactly how it's
Yes, that's exactly how it's intended. The programmable output switch to ground when they are activiated.
The only thing you need to check is if the current requirements of the VVT solenoid is no more than 1/2 Amp (500 mA). To do this you need to power it up manually, using your digital multi-meter in Amp measuring mode.
I'm going to do the exact same thing, but with the TVIS actuator. In my case it's a small solenoid valve that allows vacuum to reach the TVIS actuator. If it's anything like this it should work fine.
Be careful not to over drive the outputs, or you will pop the ULN2003 chip. Fortunately it's socketeted, so it's replacable.
See the <a href="http://picasso.org/mjlj/?q=node/606">Vehicle installation page</a> under the "Project Information Library" above for more information.
PS for VVT you should definately enable this or your performance will be flat at upper RPMs.
The only thing you need to check is if the current requirements of the VVT solenoid is no more than 1/2 Amp (500 mA). To do this you need to power it up manually, using your digital multi-meter in Amp measuring mode.
I'm going to do the exact same thing, but with the TVIS actuator. In my case it's a small solenoid valve that allows vacuum to reach the TVIS actuator. If it's anything like this it should work fine.
Be careful not to over drive the outputs, or you will pop the ULN2003 chip. Fortunately it's socketeted, so it's replacable.
See the <a href="http://picasso.org/mjlj/?q=node/606">Vehicle installation page</a> under the "Project Information Library" above for more information.
PS for VVT you should definately enable this or your performance will be flat at upper RPMs.
To be safe, then, I should
To be safe, then, I should probably drive a relay with the MJLJ output and the VVT from the relay? Sounds like a more reliable option, eh?
FWIW, I've owned my MJLJ for about a year (the car's taking a long time to build) and just got the puppy running on my bench with the EDIS parts. I attached the wheel and VR sensor to my lathe for testing purposes.
-Steve
FWIW, I've owned my MJLJ for about a year (the car's taking a long time to build) and just got the puppy running on my bench with the EDIS parts. I attached the wheel and VR sensor to my lathe for testing purposes.
-Steve