silencium

I will probably do that the next time I take it down 👍

Haha, the value of these S-chassis has climbed quite a lot too in the last years. A good unmolested OEM+ one is worth >40K AUD these days

It's not quite like that I've put that backbox on my daily S13. Got sick of the drone all aftermarket mufflers give, what is a problem of their design, because all of them are absorption type mufflers, and these just don't work for low frequencies. So that stock resonator type muffler (all oem mufflers are resonators) that is designed to work for a 300hp engine is the perfect solution for my daily. Also MOT is very strict in my country, so as a bonus its says "Nissan Calsonic" on the box ;D

Thanks for your enlightenment. That's what I though and what makes sense Would you know of a picture or a diagram of that System by any chance?

Hi guys Has anyone noticed that on the stock R34 GTR rear muffler the right tip is almost not been used? Firstly there is almost no black exhaust deposit, and secondly, after a drive that right one is is only warm, while you can't touch the left one without getting burned. Is there maybe a spring loaded flap in the box that only opens up the right section at a certain amount of counter pressure? Or what is the reason for that?

I'm gonna answer this myself as it might helps someone later on. I've bought the NEO NA RB25 VCT gear, and it is in fact the 30° version as suspected. 13025-5L701 is the part no. Great upgrade for someone that wants more out of the VCT. New tune etc. is surely needed though.

I'm digging up an old thread that has been dug up already... so it doesn't make me the ghoul 🤪😁. @Dobz Can it be, that this 30° VCT gear was from a NA RB25DE? I am searching the internet for clues about the RB VCS gears, and it looks like it could be the case that NA RB25's use a 30° gear and turbo RB25's a 20° gear.

Hi there Is there a difference in the two slightly different looking VCT cam gears for the RB? The older one has a range of (only) 20°. Does the newer one maybe have a bit more? older style: 13025-75T05 (right on the pic) newer style: 13025-5L300 (left on the pic)

Alright, thanks for the info Dobz

The check valves behind the oil filter have another purpose. These are pressure controlled and open only if the oil pressure reaches a certain point, for example when the filter would be clogged. I have found these pics before also, but these are not original nissan, but from a tuner... Even though it is a japanese tuner, that doesn't mean its all superbe. I get it that you two do not think there are check valves... But I still want to know what originally the case is.

Lately I was testing a camshaft for run out with a dial gauge. For that I put it on flipped front an rear bearing cap with some oil in between of course. Well after turning the cam approx 10 times by hand, the caps already had scorring marks despite the oil. So without oil pressure that is all much more delicate than one might think. Also the cam installed an all, there is a lot of load on it from the valve springs. If oem there are check valves, I want to go with them again Thats why I want to know

Lol what does that has to do about the question?

That is very simple: When the engine is stopped, oil could flow back due to gravity, leaving air in the oil gallery. Next time the car gets started the air has to go out through the journal bearing before the oil follows. I do not know how much the oil actually flows back, but it is definitely a bit, because otherwise oil pressure would be instant on the first engine cranks during start up. But it usually takes about one second till the oil pressure switch goes off. Using a check valves in the block would make sense imho. If one has a RB block laying around it could be checked with a thin wire.

Sorry for digging up this old thread but I have kind of a similar problem. Does anyone know if there is a check valve in the VCT oil feed or if it simply is a restrictor? Thanks for the help