ISL33P

Do you have access to the prograns to do the CFD analysis?

hahaha yeah sorry

exactly the reason why they have done it. there are some cad simulation programs results which show this would be beneficial. as for all the air being directed to no6....this is not necessarily true considering cylinders fire at different times and the air is used only when valves are open. you will find that the rear cylinders, 5 & 6, of the gtr plenum actually flows less than the 1 & 2.

As long as there is plenty of turbo flow and everything else to back it up, more than happy to consider it. If you like, pm me the details of the engine mod's and we can go from there. I want to get results at different boost levels to see the overall impact. I also have an egt kit I would like to install to get even more data to back things up one way or another.

understandably why, but have a look at the vl turbo world and they dont give two hoots...they do get plenty of canary's, but dont give cops reason to pull you over and they wont...

it can tell you horsepower, toruqe and lag differences, what else do you want? This is what everyones wants to know. I know you are stuck on the whole price legality thing, but there are plenty more who think outside that little square. I also have an egt logging kit to throw in there if need be. Its all about the engine's performance, how that translates into the real world can be affected by many factors, so we will just stick to what can be prove with little doubt and anything else is up to the individual consumer.

against standard would be best....doing against greedy as well would be great

C'mon, so no one wants a free plenum? I will help out with the installation and associated pipework.

any manifolds and cam covers?

take your pick of these two for the ca18 both surprisingly for a 8 port head, but the one with 4 runners is for a methanol powered drift car which is having the head cnc'd and the 2 ports joined together

....and that's what it looks the point. Each have their own opinion and i am sure they can speak for themselves....that's what the forum is all about. More and more of the car community are doing their own work for a few reasons (cost saving, self fulfilment and more) and hence why they are an ever growing of business based on supply only model, me included (for the time being ) As for the results to support my claims, I am just waiting on a candidate to take me up on my offer and we will have them. That way they are unbiast and cant be questioned....something that always happens when a manufacturer makes claims....it's the independance which people like to see and what i want to provide. So anyone want a FREE plenum? I want to put this topic to rest for once and for all....its been an ongoing here for quite sometime

Yes I do know. I have plenty of customer feedback to support this but I thought offering this to someone on this forum I thought it would be the most genuine way of showing it and therefore not going just by what I say, ie independent Something that can be offset by the rest of the intake system, ie runner length & design which all should be designed in conjunction....you know that plenum volume is not the be all and end all....... I can totally see your point, but there is no reason why you can get any aftermarket intake to meet epa regulations. All mine can have the factory sensors installed and the vast majority of the vacuum inputs required. no-one said making power was cheap, but there are ways to go about it making it as effecient as possible and this is definitely one way of doing it This is an integral part of the the engine and certainly an area that can be imporved upon especially since people are not satisfied with factory power outputs. Whether its necessary is certainly debateable from a technical point of view, but when you consider price, regulations etc, it certainly may put it in question, but there are certainly plenty of people who believe it is enough to do considering the number of intake systems that are sold....they cant all be wrong can they?

R31Nismoid - but what power could you make with a decent intake manifold? How much boost would it take to make that power? These are the kind of questions I ask and people can't answer. Why? It maybe just a case that no-one has challenged them on it and just believed what they have been told.....is it because everyone else says it so it must be right? I am not having a stab at you at all, just the way in which people come to some conclusions is what I am questioning. I would like to offer anyone with an rb25 a free plenum (to keep ofcourse) for some testing, especially anyone making around that 400+rwhp mark and with enough turbo to make more. Pm me if you are in Wollongong/soutj coast/sydney and we can sort it out. As for the air speed comment, you would be surprised to know that air speed does not change between a naturally aspirated or forced induction engine. What changes is the actual air density which things like pressure and temperature have a direct correlation. Not for a minute do I say this is something I have discovered or am an expert on, this is a theory that has been proven over and over again and there are plenty of books to read and sites to search to support this. What I do is try to use what information is out there and apply it to what I do.

And to the other post, I make manfifolds which make more power than a standard manifold at the same revs. Yes the can rev more as well, but that thought of long runners being the only way to go, I have disproved many times. You would be surpised how little effect the length of runners do have on a turbocharged car. Someones would lead you to believe that air speed increases in a turbocharged/supercharged application and that couldn't be further from the truth.....something to think about

The thing I always say is that you can make 2000hp (ok a little exaggerated) on a standard manifold. The whole idea is that you improve the engines effeciency. There is no denying a standard manifold "will do" but can it be improved on.....and I certainly think so! Otherwise I wouldn't do what I do.

Let's just say that the bellmouth size, design, plenum volume and throttle body size should all be matched - edit: when there is little or no compromise for performance 94mm is more than enough for anything you throw at it. Just as an example, there are some guys in the US making over 2000hp and using a single 100mm, is this the most effecient setup? it could be argued either way....and if there are any RB pumping out those kind of numbers, I would love to have a look at the intake manifold to see what thought has gone into it and compare it to what I have seen. A lot of the time people just go for the look of the 80mm throttle body....but having said that, I have seen very very good results from 80mm throttle bodies on your little ca18/sr20 all combined with a good plenum design.

"In excess"

That's a generic question considering they are all different and it can depend on what the customers wants from their engine. Strange that I haven't answered it in the past because I usually do. If you are talking about the rb26, it flows enough to support well in excess of 1500hp and that's with an 80mm throttle body. I usually don't recommend anything larger than 80mm. There are somethings to be taken from the different size throttle bodies used but not something I will do in a public forum. The single cam rb30 plenum pictured can flow in excess of 1200hp and again with an 80mm throttle body. The best thing about the it how well they flow between cylinders and proven on some recent dyno testing (using individual egt's to measure results) to support the flow tests. I take pride in making sure all cylinders flow as even as possible and combining that with maximum flow.

$1200 for the plenum $430 for the 80mm billet throttle body with tps and plug $230 for the fuel rail + delivery which is usually around $50 With a total of $1910 you are looking at a complete intake side for any rb series engine....compare that in price and flow/power potential, it is very hard to beat

Here is pretty much the finished product. I just have to weld on the LS2 throttle body plate which is on its way and the two required vacuum fittings The customer is removing the booster and clutch master and having them under the dash making way for what I think is one of the longest set of runners to be seen on a rb26. The car is going to be running a borg warner s480 turbo and there should be nothing holding it back....

for the amount of money some of you guys are talking for a manifold, I can make one with custom runners, 80mm billet throttle body and billet rail and all polished....oh and did I mention able to flow more than any of them!!!! similar to the pic below. that is for an rb30, but the concept is the same. and yes it will accept the IACV

is it complete or bare?

click here for my work

ahhh the joys of working from home....no need for rent!!!!! and the reason why i dont charge an absolute fortune like a lot of others other there

also ring around some welding shops and see if they have any old stock going cheap, that's how I got mine 1/3 of retail price.