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Piggyback V88 VCT Nissan


mack85n
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Would it be possible to control VCT with a piggyback V88 on a Nissan TB48 Factory ECU or would that conflict with the outputs of the Stock ECU causing an active fault?

If it is possible would a resistor of some sort need to be wired into the factory ECU VCT output to satisfy the circuit? Only new to Nissan ECU controls so sorry if this is a basic question.

Cheers,

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There are a few unknowns with this. The first thing is to try and get an oscilloscope capture of the cam signals with the crank signal as a reference. This way we can see if the V88 has a mode it can use to control the cams. 

It is also unknown about how the factory ECU will behave. It may be ok with not having the cam sensors or cam solenoids connected. Or it may not even work with resistors fitted to simulate the solenoids, as it may be expecting to see a certain cam position when it applies a certain duty cycle.

Hopefully someone else will have done one of these and comment.

Scott

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There are a few unknowns with this. The first thing is to try and get an oscilloscope capture of the cam signals with the crank signal as a reference. This way we can see if the V88 has a mode it can use to control the cams. 

It is also unknown about how the factory ECU will behave. It may be ok with not having the cam sensors or cam solenoids connected. Or it may not even work with resistors fitted to simulate the solenoids, as it may be expecting to see a certain cam position when it applies a certain duty cycle.

Hopefully someone else will have done one of these and comment.

Scott

It is my understanding of the Nissan TB48 VCT that it is simply a switched solenoid based on RPM and MAP with pre determined ECT, TPS and Vehicle speed as per the attached Haltech pic. Would the factory ECU use the same conditions?

VCT.JPG

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Looking at that image it sure looks like it is an on/off (2 position) type system. That's kind of surprising given that the TB48 came out in 2001 (according to Wikipedia at least). But it does make things more simple, our ECUs are easily able to do a control system like this. I also doubt the factory ECU is going to care if the Vi-PEC take control of this.

If the factory ECU is still running the engine then you could look at the conditions under which it enables the solenoid (engine speed and throttle position at least).

Scott

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  • 2 months later...

Hi,

old post but yes the VCT on the TB 48 works exactly the same as RB 25 DET , RB 25 DET NEO, SR 20DET.

Your choice how you wish to control it, i use GP PWM with 3 conditions along with the  PWM table to give me another axis of control

Regards

Dave.

Thanks Dave,

 

Good to see you on the forum. You've obviously got a wealth of Knowledge!

Which Shop do you run in Cairns?

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