yea… theres NOOOO improving upon THIS … becuase its always a good idea for air to have to turn 270* in the intake manifold
how is it not useful to SUGGEST the guy saving his time/$/effort cuz its a hard-to-achieve goal…
i think its cuz we are saying things u dont wana hear :shrug:
no, because you have no idea what you’re talking about. look at the stock one, then look at the performance one ford makes. if it was so fucking great ford would make a performance manifold would they?
did you not read my post about banning useless posts?
you want a time and money saving suggestion? dont boost your car, it wont cost you any money, and you wont waste anytime on it. it wont break, and you wont have to pay to fix it. thats how stupid your posts look.
so, uh…back to me wanting to build my intake manifold. how hard is it to tune, i have the SCT pro-racer software, and have been using that on my car, but im still a noob. i would like to think about the ITB’s idea if the advantages are so great
tuning itbs is something that either you have done countless times before and you know what you’re doing. or its something that will take you 6 monthes to get running properly.
itbs are cool, but you may want to stick with a more conventional manifold. but if you’re feeling spicey, rock out with your cock out. it will cost more, and be a lot more fab though. if it wasnt, mine would be on my car already.
anywho either way you should read this book:
Forced Induction Performance Tuning A Practical Guide to Supercharging and Turbocharging
you can get it at amazon.
i have this in front of me … and a quick review of the mani design chapter tells me nicks stock mani is garbage
this should help:
Interesting discussion but I will put my 2 cents in. I have a very similar view of things like Sam does. It come down to understanding a few factors…
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Cost - How cheaply can we make a manifold to keep the overall cost of the car down. Plastic is a helluva lot cheaper than cast metal to manufactur.
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Fuel efficiency and Performance - Obviously we are all smart engineers (auto engineers) so we can make a performance manifold if we want. If the car we are making it for is a “performance” vehicle we will design it to the vehicles target power band. Example: 2nd Generation DSM. Long runners, narrower ports than on the 1G, etc for a small turbo’d car who’s primary power is in the low end (peak torque is around 3k rpms). Obviously the smaller, longer runners are optimal for fuel efficiency too as I am willing to bet the 2G gets better gas consumption than the 1G did/does all things being equal. Do engineers designing for performance really know what they are doing? Fuck yes they do. The 1G DSM intake manifold was THE BEST of all the aftermarket manifolds from 3k - 6.5k in terms of HP. This is a cast manifold and it wasn’t even ported. If the car is NOT a performance vehicle, (e.g. Ford Focus), the design is going to be different and a lot more geared towards gas mileage than air flow or going fast.
One thing you gotta keep in mind when a vehicle is designed is how to make something as easily and cheaply as you can while still maintaining some sort of performance numbers (depending on the vehicle). Unfortunately, it’s mostly about $$ and more profits for Ford, GM, Nissan, etc…
Designing a manifold for the Ford Focus for peformance is going to be somewhat easier since the stock piece looks to be a restrictive POS. Anything (within reason) is going to show an improvement over stock in this case since you have a boosted Focus, right?
When you get into precise measurements like the runner length, runner size, plenum length, plenum shape, etc, is really when you can target your powerband and airflow at certain RPMs and get the most out of your setup. When you have a performance vehicle, you are less likely to make something that is going to yield improvement over the stock piece. Obviously it’s different from manufacturer to manufacturer.
Hey never said anything about the focus manifold, just SAM had some good info there. Bigger isn’t always better. That is the trueth, if you want to ban for that reason then go right ahead
well that (focus) is the manifold in question. for the sake of this discussion lets keep that in mind.
back on topic. the nice thing about this manifold/design is the air coming in at the center of the runners. finding someone with a ford performance manifold that is willing to take measurements for you might not be a bad idea either.
well, the one guy who makes one/is developing one is an arrogant prick, and his whole life/business is getting people to pay him to make focus’s fast, so i know he wont dish out his specs if i ask for them. ill think about it some and ill see what my best bet is gonna be, it looks as though i can get my hand on a free ported stock one that just needs a fitting JBwelded or sumthing, so i might go that route for a while and end up just building a regular sheet metal mani.
get ahold of a ford focus wrc intake 
wait, that might be pretty fucking hard
get a focus rs intake instead
cannot find an RS manifold, not even on ebay.co.uk, i also dont know if its any different. so who would be up for helping me build this and do the calculations? im also debating on regular manifold or ITB’s so thats gotta be factored in as well. i will pay for good help 
at Zerodaze and hotrodkid