AndrewD

I had figured that out. Im not stupid. But he should explicitly define that adjustable cam gears do need to be played with not just 'get' them. Ive played with adjustable intake and exhaust cams and even modified a cbr600 engine to accomodate independant variable valve timing for intake and exhaust cam phasing. i didnt say i didnt like nismoid but as far as hold my trap when i see something blatently obvious as pure crap. You can forget it. If you dont like my posts or my advice then dont take it. Some background information. Im a race engineer designing high performance turbo applications for high speed and high specific output motors. Think of it as you will. If you want to decide if he can run 14 pound then bring out the compressor and turbine maps and do it for real. What is the efficiency of the standard turbos at that pressure ratio? whats the corrected shaft speed? Weigh up the increase in compressor outlet temperature and pressure and see if there is a decent increase in massflow and its effects on timing. I could go on.. but Beer doesnt want the advice of an engineer. Personally i dont care when it comes time for my car ill take peoples advice and judge it on its merits. Then make my own decision.

Not unless your timing is out

Well yeah, the cost savings would make it reasonable. But i would hazard a guess that the nissan designed coils are substandard if they cant take the heat. Although i consider most motorcycle engines superior to those of road car engines, the honda cbr600 coils which are directly above the spark plugs in an enclosed and exceptionally hot engine bay have never failed atleast for me. This is on a turbo application running antilag. So the engine bay is in the vacinity of 200 deg C + But then again those engines are the closest to f1 technology as far as rpm range and specific power are concerned so its another league.

Nah mate, the other dude is right, however its actually about mass flowrate not volumetric flowrate (CFM) as that implies that temperature effects are negligble. i.e. you could one volumetric flowrate but different mass flowrates for varying temperatures. So two turbos running at 9 psi nets 9 psi MAP but twice the massflowrate than one would at the same boost pressure. But i agree with you nismoid should really stop giving out crap advice, but hes victorian, the home of material boys. Im guessing he gets a commission for selling as many cam gears as possible. That or dreams of them

I cant see how just 'replacing' the cam gears is going to net you gains. 25 kw gains at that. Please elaborate more. Are you talking about a direct swap, or adjustable 'slotted' cam gears you can adjust valve events start / end timing with?

I couldnt actually be bothered to read the thread, but heres my 2 cents; -Wasted spark ignition was originally for engines without sync sensors (ie engines that didnt know which of the 4 strokes they were on) -Those engines also had batched injection for this reason. Leading to poor fuel economy -There are no economy benefits as far as fuel is concerned, accept your your hip pocket on replacement parts -And as far as improving efficiency by burning the unburnt fuel on the exhaust stroke, thats a crock of shit. Even with a stratefied charge engine the spark plug is the initial ignition point (prevailing preignition doesnt occur) and at the time of 2nd spark the only gas surrounding the plug is burnt (assuming spehrical flame production). Not to mention that at the time of ignition the gases are being forced out into the exhaust manifold or intake given a significant overlap and high emap. -Which brings me to my next point, often this ignition leads to intake manifold explosion as the flame now travels back up past the intake valves. So in conclusion, while it may present you with savings over coils etc its not the greatest of solutions for an engine, especially one with a sync sensor. Just dumb if you ask me.

What is with you and cam gears. They do squat! Changing to slotted cam gears isnt of much benefit unless you can verify either retarding or advancing the cam is adventageous. And your avatar. It merits ridicule.

Hi all, Im just wondering if the R32 GTR came with a sun roof option. And if so what type of sunroof was it? I havent seen any pictures before and would like to know, otherwise it would be a custom modification

Interesting, i read the brochure and their material safety data sheets and it seems to me as a rebadging. Also optimax extreme claimed a minimum of 100 RON rating, including 5% ethanol. Marketing hype. Thats all. Same thing as unleaded 98 changed to optimax.

Typically they are fed in after the turbo (ie between turbo and engine) So id rather worry about the engine, even if it was fed prior to the turbo. In any case you would probably want a check valve in between the catch can and the intake to stop back flow and a filter to limit any debre. Also welding stainless steel to aluminium is quite hard. Actually almost impossible. Typically low grade aluminium sheet would be better

Depends really, steel wool could be used, or sheet metal baffles.

Theres so much bad advice on forums like these (not saying this is a bad forum for that) but most people offer advice on products they know nothing about or have heard whats been going on around the rumour mill. To pass emissions most of the blowby is recirculated into the intake. Its that simple. This is not good for combustion efficiency nor and can lead to preignition. However a catch can, which allows the the oil air vapour to separate, stores the oil and vents the air to atmosphere. On a wet sump system this is often routed from the top of the cam cover, while on a dry sump system it also comes from the scavenge lines / deaerator. They arent neccessary no. But an engine with high blowby may bog down, ping and get poor economy. So in that case they would be advisable. Hope this helps ya.

Depends what difference you are after. Increasing cap pressure increases system pressure, which increases the boiling point of the water. Which may reduce your chances of over heating. However you wont notice a power increase. And if its an aluminium core you may find you might start to rupture tubes. Especially if its old.