New intake

[vinnie1069]

I have a question about an intake manifold. first off, the car i drive is a 1997 dodge intrepid with the 3.5. Now dont tell me to just get another car, i am fed up with that answer. i am trying to build something unique and fun to drive, and i realize that its not going to be a street terror or anything, just better than it is now. i want to stay N/A, at least for a while. i will be building a new motor for it next year, and it will include the crank from the new 4.0 that is coming out to boost disclacement a little. i have plans for custom headers, ported, polished, and cammed heads, a GReddy Emanage system, and a custom upper intake manifold. the intake i have now is similar to the intake found on the newest 300zx cars. this is a long runner intake, great for low end, but i want this thing to rev like it was meant to. what i want is to put the throttle bodies right on top of the engine in a real short runner intake. some of the plymouth prowler guys have done similar intakes, and they have the same engine as me. My question is: Is there a certain way that i should make the intake manifold as in making all runners the same lenth, or shoud it just be a very open design with as little restriction as possible? For example, should each runner of the lower intake be lengthened and put right up to the throttle bodies, or should the throttle bodies sit on what is essentially a hollow box and have the runners pull air from this large plenum area? Thanks in advance,
David

[i drive crap]

This could get tricky. I would check to see what the prowler guys have been doing, but I'd imagine it's a sheet aluminum set of runners that feed a sheet aluminum plenium with a throttle body on the end. I know of a few fabricators in the industry that make this type of stuff for big v-8's, but I've never heard of one like this. I'd imagine it's going to be wicked expensive. Another option may be to hack the stock intake up, and have a sheet aluminum plenium welded on the runners, but as wild as you are talking about building this, the stock ports may not be able to keep up with a bigger displacement and higher revving engine.
Biggest issue with fuel injected engines with custom intakes and what not is getting all the coolant where it needs to go to tell the correct sensor what's going on. You are almost certain to throw a CEL if it's not done properly, and possibly suffer a computer that will never cycle between closed and open loop.

[vinnie1069]

This could get tricky. I would check to see what the prowler guys have been doing, but I'd imagine it's a sheet aluminum set of runners that feed a sheet aluminum plenium with a throttle body on the end. I know of a few fabricators in the industry that make this type of stuff for big v-8's, but I've never heard of one like this. I'd imagine it's going to be wicked expensive. Another option may be to hack the stock intake up, and have a sheet aluminum plenium welded on the runners, but as wild as you are talking about building this, the stock ports may not be able to keep up with a bigger displacement and higher revving engine.
Biggest issue with fuel injected engines with custom intakes and what not is getting all the coolant where it needs to go to tell the correct sensor what's going on. You are almost certain to throw a CEL if it's not done properly, and possibly suffer a computer that will never cycle between closed and open loop.
well its just the upper intake, so no coolant goes through it. i plan to weld in bungs to use all of the factory sensors and vacuum lines. all i was thinking was ditching the stock upper intake, and replacing it with a custom short runner piece. all that would travel through it would be air.

[vinnie1069]

any new opinions?

[2genCRX]

get a new car :rofl:

[DeCoY]

get a new car :rofl:

LoL