Vct On Neo Rb25 Vs S2

[Rolls]

I'm fitting my neo tomorrow and wanted to know if there are any differences in how the VCT is operated. Is it the same as the s1/2 rb25 where ti is switched on just above idle (~1000rpm) and switched off again at 4500rpm?

Also out of curiosity does it operate the same mechanically by retarding the intake cam -5degrees?

[Simon-S14]

yeah its more or less the exact same set up mate.

RPM switching points are different tho.. about 5000 is the changeover point. due to different cam specs.

[Rolls]

I might play around with it on they dyno, do a run with it on and then again with it off, figure out where they overlap and base it on that to get the best point. As long as it is pretty much the same shouldn't be an issue though.

Edited June 10, 2011 by Rolls

[bubba]

My neo was on at 1200rpm and off at 5000rpm but that doesn't really work with the highflow, I need to bring the turnoff point down.

Also, I was under the impression that VCT advances the intake cam 20deg.

[Rolls]

Probably correct, I'm not sure where I heard -5.

[bubba]

That's about what most people retard their exhaust cam gears..

What ECU are you using? and what thermostat? Neo ECU's need to see 70deg water temp to enable (if NIStuned, you can change this), other than that I can't think of any issues

[Rolls]

Using all R32 gear and some R33 gear. VCT is manually controlled via Eboost street which has an rpm activated relay which I just set to whatever rpm I want.

[bubba]

Sounds like a good plan

[SS8_Gohan]

so you're adding the NEO VCT setup to a Rb20??

[Rolls]

how on earth did you come to that conclusion?

no I'm fitting a neo rb25 to my r32 skyline lol

[Simon-S14]

My neo was on at 1200rpm and off at 5000rpm but that doesn't really work with the highflow, I need to bring the turnoff point down.

Also, I was under the impression that VCT advances the intake cam 20deg.

fwiw with my set up running poncams and 3076 we raised the turnoff point by 500 rpm to 5500 for the best results.