Bsa

Looks wicked man I have to say

I'm trying to Design a plenum that is cost effective that give people the option of using stock parts so on. Without damaging flow and response. Also not spending 1000s of dollars to buy a jap one. I understand how they flow I also understand the runners are the main part that makes it work but not everyone wants balls out power most people are happy with a tidy looking bay and a nice responsive set up. Are you now going to bring me down for building a fuel rail saying I don't understand how it works. I'm not some young punk that thinks he can do whatever I'm actually putting mathamatics and science into designing it all. Tell me have you ever stepped out of the box and tried something for yourself rather then being like a sheep and doing what people say is best. Do you do or your own your or pay a mechanic to do it? You have said what you needed to say and I understand your views. But please keep your input out now rather then stirring up a argument. Oh there is a thread in the fab section regarding a external gate on a rb20 manifold y dont you go and tell me how to improve on that seeming your the expert

What is your problem mate seriously? Did you fail to do it yourself so now no one else can have a go like seriously I'm done trying to convince you that this could work. Take your issues else where

Thanks mate good to see not everyone condems new ideas

Even the stock exhaust manifold can see improvements. Iv modified one with great results allowing it to flow better by adding a external gate. People where not jumping up and down saying it can't be done more intrigued to see results. This is the same sort of thing just on the cold side

Runners are a major factor and plenum size for that matter. You can't just bolt any plenum on and expect it to work cos you have a good turbo setup everything has to work together. For a stock setup I'm sure you can't beat the stock plenum 1000s of hours went into designing it. When you start changing turbos and exhaust manifolds induction will change so a bigger plenum will benefit your setup if you can get more air in your engine will love you for it

I'm thinking you have to block off every point

If I allow enough room they should be ok

On my 20 I just removed all the hoses and went to repco and got ones that were close all up it cost me 50

Yeah true do you have a brace tho?

Iv used silicon what are you putting through them oil water air?

Thanks mate

Can someone mesure from the top of the bottom runners to there strut brace please

I'll run the stock tb and see what happens. Just did the calculations and plenum will be 4.9 in volume which is more then big enough. I totally understand what you saying gtsboy I'm not trying to achieve a mirical if I can get results like the plasma man I'll be happy

Haha I I'm sure I will jez but If it works then I might get lucky. Back to back runs will be happening with both plenums. It's not like I'm doing the impossible

No one is getting me I can make all my own bit and prices. just material costs. I don't mean to be rude but all I'm asking is for people's preferences for a street car not tell me I'm stupid for having a go

If I fail then I will. I made one for my 20 cut the flange off shortened the runner by 20 mm and put the plenum I made on car was more responsive and seemed slightly more torquey I'm not after every bit of power I'm just interested if a simple thing can aid. Also if I can do it myself I will I hate buying things I'm capable of even if it ends up cheaper. I dont see why you guys are sitting there telling me to not bother one day you could buy one. hks didn't just pop out of no where one bloke decided he could do it better and now it's global I'm not saying I could get to that point but if I can do it better then some then I will and have extra cash at the end of the week because of it everything starts out just a idea

I understand I won't make a huge difference but anything is a gain if it creates better flow also. But at the end of the day most people buy them cos they look better most people don't care what it does as long as it looks good and adds better response they are happy

That's y iv taken aspects from all the leaders. Tell me how many tests have been done on a 300 dollar eBay special fck all it works so people buy it. I can do all the work myself won't cost much as my mate will flow test it for me and I get the alloy for cost. I'll make as many as I need to get it right

Did you only half read what I wrote. I understand the stock manifold is capable of the job I need but lets face it looks like shit. Forward facing looks so much neater and it improves pedal feel and maybe a bit more torque y not. Mathematics is the major factor in design your dreaming if its not. And yes a have access to getting it flow tested and all that which will be done

Done tones of research and have learned all the mathamatics behind desining one. the plasma man plenum don't do much other then store more air then stock. The reason for more response is the fact the air doesn't turn back on itself so when the valve closes the air that wasn't consumed pulses back up the runner causing turbulence. So removing the bend allows the air to pulse back into the chamber faster causing less turbulence so quicker response very simple really. So plenum size is the next thing smaller smaller the plenum gives more resonce due to increased velocity. larger the plenum means more air up top more power but less midrange. The stock runners are designed for midrange but also high rpm well untill stock limiter. My old boy is a mathematical genius seriously can work out anything so he is helping on the design. I forget to mention I will be utilizing the bottom runners so no mods are really required just need to get flow to the runners equal

Silicon ends up breaking down at least the rubber turns hard and stays that way for a long time

I'm fabing a plenum up for myself. It's going onto a rb25 and iv never made one for a 25 before. Done a few for rb20 but the 25 seems to be totally different in design. If it turns out to work really well ill make up a few.This is a serious question i don't want stupid answers as I'll be using this info to build the plenum. I'll explain later after I see what people have to say cheers everyone

Ok so after a shit load of reading and smoke breaks iv come up with my design simular to some plenums but different as well. It turns out the the plasma man plenum didn't do much other then store more air then stock. The reason for more response is the fact the air doesn't turn back on itself so when the valve closes the air that wasn't consumed pulses back up the runner causing turbulence. So removing the bend allows the air to pulse back into the chamber faster causing less turbulence so quicker response very simple really. So plenum size is the next thing smaller smaller the plenum gives more resonce due to increased velocity. larger the plenum means more air up top more power but less midrange. Now I want everyone's opinion seriously. Would you rather want more power between 3500rpm and 6500rpm or 5000rpm to 8500rpm for a street car? Prob should start a poll on this that way I can make a plenum to suite street and one for track. I'll start fabing one soon

Don't plan on it