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Rb25det Neo Vct Knocking

mrstageaman

By mrstageaman,
in Engines & Forced Induction

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mrstageaman Newbie

mrstageaman

Posted
Posted

Ive just got a 25det neo running in my stagea, but theres a knocking coming from the intake cam when the vct solenoid isn't open. When its idling up until about 1400rpm you can hear the knocking but when the vct opens, above 1400rpm, the knocking goes away and sounds mint, ive tried replacing the solenoid with another one but to no avail anyone had this before?

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https://www.sau.com.au/forums/topic/458930-rb25det-neo-vct-knocking/
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  • 2 weeks later...
Mrstagman Rookie

Mrstagman

Posted
Posted

So i changed the cam gear with one of a 25de neo, and i noticed that the cam gear was bolted up differently to the original one, the de one was bolted central to the vct and the det was bolted hard one way. I ran it how it was set and was lacking alot of top end and didnt keep pulling at all after 5000rpm, so i moved it the same way hard as the original one and still is lacking top end and it feels like its surging when you put your foot on it? Is it too advanced? Could the cas need adjusting? post-140767-14402025659652_thumb.jpg

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

not sure if related, but when I did my timing kit and removed the VCT solenoid to take the seals off, I over tightened the VCT using a rattle gun (being lazy of course). Some how I jammed the unit and the car was sluggish down below...

Make sure it's sitting in the right position before torquing it up to spec.

Ben C34 Grand Master

Ben C34

Posted
Posted

Man, I meant the whole vct unit along with cam gear.

I thought it was kind of obvious.

Changing just the actual gear part is a bit pointless, it's the actual vct actuator part of the car gear assembly that needs to be changed.

Mrstagman Rookie

Mrstagman

Posted
Posted

I changed the whole unit, not just the outside gear, the knocking has stopped, reading up it sounds like timing, a mechanic mate is bringing his scanner over later and will plug it in, to make sure the timings right

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