RB25 vvt

Discuss which Sensors work best with these ECUs and share how you are using inputs and outputs
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rocar
Posts: 107
Joined: Sat Sep 10, 2011 8:20 am

RB25 vvt

Post by rocar »

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 ?
Mr Drew
Posts: 62
Joined: Mon Apr 09, 2012 11:08 am
ECU Model: S80 Pro
Firmware Version: 62

Re: RB25 vvt

Post by Mr Drew »

I'm pretty sure the vvt is just off or on with those engines so yes it will work.
stevieturbo
Posts: 3577
Joined: Tue Aug 02, 2011 12:08 pm
ECU Model: No ECU
Location: Norn Iron

Re: RB25 vvt

Post by stevieturbo »

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.
rocar
Posts: 107
Joined: Sat Sep 10, 2011 8:20 am

Re: RB25 vvt

Post by rocar »

So it 0 deg or max ie 30 deg or so ? Like Vtec
rocar
Posts: 107
Joined: Sat Sep 10, 2011 8:20 am

Re: RB25 vvt

Post by rocar »

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
stevieturbo
Posts: 3577
Joined: Tue Aug 02, 2011 12:08 pm
ECU Model: No ECU
Location: Norn Iron

Re: RB25 vvt

Post by stevieturbo »

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 ?
rocar
Posts: 107
Joined: Sat Sep 10, 2011 8:20 am

Re: RB25 vvt

Post by rocar »

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
Mr Drew
Posts: 62
Joined: Mon Apr 09, 2012 11:08 am
ECU Model: S80 Pro
Firmware Version: 62

Re: RB25 vvt

Post by Mr Drew »

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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