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 Post subject: RB25 vvt
PostPosted: Thu Jan 04, 2018 1:49 pm 
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Joined: Sat Sep 10, 2011 8:20 am
Posts: 77
Just started an RB25 Neo with oem CAS, running fine fully sequential.
Problem is with Vvt as cam sensor is on Exhaust cam and Intake is variable.
Does Vvt works ?


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 Post subject: Re: RB25 vvt
PostPosted: Fri Jan 05, 2018 2:55 am 
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Joined: Mon Apr 09, 2012 11:08 am
Posts: 52
ECU Model: S80 Pro
Firmware Version: 62
I'm pretty sure the vvt is just off or on with those engines so yes it will work.


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 Post subject: Re: RB25 vvt
PostPosted: Fri Jan 05, 2018 4:15 am 
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Joined: Tue Aug 02, 2011 12:08 pm
Posts: 2882
Location: Norn Iron
ECU Model: No ECU
A lot of searching seems to suggest the basic RB25DET is a simple on off, but the NEO may well be variable. If it is truly variable..how much actual control without a position feedback sensor though is another matter.


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 Post subject: Re: RB25 vvt
PostPosted: Fri Jan 05, 2018 10:57 am 
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Joined: Sat Sep 10, 2011 8:20 am
Posts: 77
So it 0 deg or max ie 30 deg or so ? Like Vtec


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 Post subject: Re: RB25 vvt
PostPosted: Fri Jan 05, 2018 12:30 pm 
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Joined: Sat Sep 10, 2011 8:20 am
Posts: 77
Made some research and yes they are on /off basis , it should be switched on around 1500 rpm and switch it off around 5000 rpm.
One question I wired solenoid on cam control pin 5. Do I have to use an Aux output or can be switch on/off from Cam Functions ?

Thanks


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 Post subject: Re: RB25 vvt
PostPosted: Fri Jan 05, 2018 2:06 pm 
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Joined: Tue Aug 02, 2011 12:08 pm
Posts: 2882
Location: Norn Iron
ECU Model: No ECU
I'm sure it could be activated much the same as a Vtec would on a Honda which just uses a simple 2 wire solenoid.

Probably just treat it as Vtec, and from searching it seems to move the cam 20deg ?


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 Post subject: Re: RB25 vvt
PostPosted: Fri Jan 05, 2018 2:17 pm 
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Joined: Sat Sep 10, 2011 8:20 am
Posts: 77
But if I'm not wrong Vtech is wired on different OP and also you can only switch on certain rpm and remains on until rpm goes down again.
I need to turn off again after about 5000 rpm
I will try to use PWM map


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 Post subject: Re: RB25 vvt
PostPosted: Fri Jan 05, 2018 3:00 pm 
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Joined: Mon Apr 09, 2012 11:08 am
Posts: 52
ECU Model: S80 Pro
Firmware Version: 62
You can do it with the cam pwm maps or one of the aux outputs. I've been through the same thing with BMWs early vanos.


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