Has anyone try making a custom intake manifold say out of aluminum. Just wondering because the stock one seem a long way for air to travel.

 

any one

 

Not that I know of. Most people just port/match them.

 

The runners are long for a couple reasons, but mainly to help torque. That said, I'm planning on making a new manifold for my TII sometime in the <relatively> near future.

 

i thought a bunch of people already did it
home depot ghetto style

 

just strap the fd manifold on and ur good to go!

 

wrong, it won't fit without major modding

 

The mod isn't "major", its "minor"

 

hey--will that work on NA cars or only for tII? Also....what is the mod to make it fit, and does anyone know what kind of difference it makes?? Just wondering if it would be worth doing for my GXL

 

If you change runner lengths and plenum volumes yet you don't change the stock ecu, you aren't going to get much out of it. The stock engine has long runners that tune the engine for streetability. This is also where your gear ratios work best. If you want a higher rpm power band prepare to make some sacrifices. The stock afm will max out very quickly so you may gain very little if any up top but lose low end. Your gas mileage will probably suffer. The first thing you should do is to replace the stock ecu with a standalone unit. You'll gain about 10% hp just by getting rid of the afm. Then you can worry about a new manifold since you can now tune to it. Don't even think about bandaiding the system with that damn S-AFC piece.

Here's my custom built T-II manifold. No more stock ecu here. Forgive the mess, that was when the car was under construction.

https://www.rx7club.com/showthread.p...xhaust+sleeves

 

im not sure but i read somewere mazda made the manifold for maxmium performance for the car. I dont know if there is some one who could design a better one but someone should give it a try atleast.