Turbo Intake Manifold on a 6 port
 

I recently found in a thread that the turbo intake manifold can be ported and used on the 6 port block. What i'm wondering is what would the effect be of the turbo manifold without a turbo. So would the turbo manifold give or take any power otherwise becaus i can get one locally soon

You'd probably lose power since the TII manifolds are designed for a pressurized intake, and the N/A's is designed for the dynamic stuff.

If TII manifolds gave N/As more power, mazda would have designed the N/As to have TII manifolds in the first place.

I dunno it depends.

Example is that Mazdaspeed7 put a TII LIM and FD UIM and TB onto his bridgeported N/A to get better flow and longer runners. But with the stock LIM and UIM I'm not sure. Personally I'm putting on an s5 TII LIM and FD UIM/TB soon but will be using it for the turbo project later. I'll be running it like that on my n/a for a couple months.

well thats exactly what i plan on doing only with s5 t22 upper and lower manfolds and tb

bump any input from anyone who has already tried it?

The TII manifold has more flow capacity. Unless you go to the work that Mazdaspeed7 did, I don't think you would see an improvement. Bridgeported engines aren't happy unless they spend 95% of their time in the upper reaches of the rev band. That would be pretty tough to live with in driving other than racing.

You'll pick up some decent performance by having the N/A manifold Extrude Honed, and doing a street port and header.

I was thinking of doing this with my TII parts as well, even if the performance was hindered, its less work for when I put the turbo in later on. Make sure you get the secondary fuel rail, the TII throttle cable, and hope that the AFM wire stretches long enoughe for it to be mounted on the other side of the engine bay.

well i really doubt the afm will reach but extending wires is not a problem. and i don't want to modify the NA manifold since the purpose of this swap is to make turboing this car easier and avoid using a spacer. i understand all that would need to be done to install it i'm just looking for someone who knows what the effect would be durring the time that i have the tii mani and still no turbo

Why don't you just keep the N/A manifolds on there until you get the turbo, and then just put everything together all at once?

I've been thinking about doing this. I want to pull the whole intake assembly apart and clean the crud out of everything and replace all my vacuum lines. It would be the perfect time to get them honed.

Can you buy a tool to do this, or do you know of a good place in the St. Paul area that can do it for a decent price?

Hey, you live not that far away from me either, I'm a block from Smith Ave. and Annapolis. :D

That is exactly why i posted this thread to see if anyone else had ever just put it on so i would know whether or not the manifold would be any better for the time being. So if someone says "yeah i put the tii manifold on my NA and it helped." than i will do it if no one has done it then i'll try just to see what it does. and if everyone says its worse than i won't bother until i put the turbo on.

Shorter runners, not longer. Shifts the powerband up.

OK well it makes sense that the shorted runners are going to shift the power band up, but will i still have a useable powerband? Will i notice a loss of low end but a gain in the uper rpms or would these short runner move the powerband up higher than the stock ports can sustain?

Stock port? Use a s4 n/a lower and a s5 vdi upper.

well i'm not doing this to just gain power i am using s who tii manifold since i will also be using the tii turbo and manifold later. I want to go with the tii manifold to avoid cutting the fream and using a spacer to make the turbo fit. also with the tii manifold i'll be able to use the top mount intercooler untill i save up for a front mount

nm you're right.

fream = frame :)

I wonder if using a long intake pipe might make up for short manifold runners.

FD UIM with TII LIM have shorter runners than stock N/A intake manifolds.... so shorter, not longer.

Sorry my post was somewhat confusing, I forgot to mention I was comparing the FD's longer runners to the TII stock manifolds shorter runners. I was just saying how mazdaspeed7 put the FD UIM on INSTEAD of the stock TII UIM because it had longer runners.

My bad.

im just a little dyslexic at times, longer runners add low end toque and short runners add high RPM horsepower, i remembered it backwards.

Rethink that again ;)

bah, you know what i mean. i think i woke up on the wrong side of the bed this morning..

:) Just rubbin' ya.

Merry Christmas...
or, otherwise, happy other religious holiday.

I tried using the turbo intake manifolds on my s4 6-port 13b Rx7, but u need to fill in the ports on the far left and and right with aluminum (get a welder to do it unless u know how to weld) on the lower manifold (turbo manifold is 4-port and the N/A is 6-port). Once the ports are filled machine the surface flat again (a head machining shop can do this quiet easily). Then get a new S4 or S5 N/A lower intake gasket, place it on the surface of the now flat lower turbo intake; just as it mates to the engine, draw circles with a black sharpie where the intake ports should be (6-port design). Drill good size holes in the center of these circles, then slowly work out the rest of the material with a grinder or drill with a carbite griding bit. When your satisfied with the holes sand and polish them if you wish.

Oh, and you will have to shorten the oil filler neck or custom fabricate one; in addition to running the longer wires for the AFM, and relocate battery to the back(trust me it gets in the way). One of the bens behind the passenger seat or driver seat is a great place! HOPE THIS HELPED.

Dude this thread is from 2004