I wanted to start this thread with the hope of motivating someone out there to
do some R&D on a New Intake Manifold for the RX-8...

We are starting to produce some decent Power with the turbos now, that I'am hearing that this is a lodgical move.

If you take the time and look at the plastic intake manifold and the contour of it's
shape, It looks as if we can improve on that design for Better Flow, which should
help make more power for both Forced air and Na Renesis motors.

I look at the 13b,20b's intakes and they look much better designed to me... So if
anyone is interested please respond, and maybe they will hear and put some R&D
time into looking at the flow and flow restrictions on this intake, and comeout with
a New Chrome looking better flowing intake manifold .

Come on guys I know someone has this Idea going thru the head......Thanks

 

I think PTP mentioned some time ago that they were considering developing a new manifold. I'm sure it will be awhile though as they still haven't released their turbo kit.

 

If you want my opinion, and you did ask. You will be hard pressed to better the one you have. I have studied it in the course of designing a manifold for my supercharged application and see no great avenues for better flow. Not that you couldn't make it bigger but you will lose power below some point where you start to gain. There are no sharp turns like in the exhaust so you can't find anything there.

I love to toss stock stuff and build my own, but in this case my instinct is to leave it alone. I'm only changing it because I have to gain some real estate. Yet what I'm replacing it with is almost the same as far as it can be. I have free hand but I'm going with Mazda. It costs me no more to make it different and I'd love to say that I made it better.

 

Hell, id just like it if you had a metal intake of the same design. I dont think much need to be changed and i think mazda did a good job with their design but i just dont like the idea or look of a plastic manifold. Just make a metal intake of the same design and id buy it!

 

Just buy my supercharger, it comes in the kit.

 

^^^
That's what a lot of us, like me, are waiting for!!!

 

Actually the plastic was probably designed to keep intake air temps down. Plastic is very good at desipating heat.

We might be making an intake manifold for turbo setups but we haven't decided for sure yet. Hopefully some time this year we will start having a little more free time to work on our projects.

 

Like this:

https://www.rx8club.com/series-i-aftermarket-performance-modifications-23/acosta-custom-upper-aluminum-intake-58416/

 

Oh yeah I remember you saying that. THat will be awsome! I cant wait till you get your little project done!

 

Ive seen that too. the price scares me though! lol

 

We thought about designing one too.The plastic intake is ok but we have seen it expand and contract with boost pressure.Watching your intake expand on the dyno is sort of scary and it is only a matter of time beffore the glue that holds it together lets go.Here is a picture on an intake we designed for the Z.

http://www.speedforceracing.com/imag...ld/g35_1_3.jpg

I am sure we could come up with something cool for the 8.



Tim

 

I want one of those!!!!! MAKE ONE LIKE THAT FOR THE 8!!!!!

 

Very cool, it looks like two giant hands with fingers reaching down into the engine.

 

The stock intake manifold is a much better design in every area than any previous manifold ever used on a rotary as supplied by Mazda. It is most certainly better than the 3rd gen RX-7 manifold. It's turns are very smooth and gentle. The plastic piece is very nice. Making a different one out of aluminum may be beneficial for strength reasons but don't expect to really improve on it in the power department. You could alter the tuning a little bit by varying it's collection length though.

 

You call that an engine? If it ain´t a rotary it ain´t an engine...

 

Thats awesome.

 

Hey guys thanks, I was unaware of some of the manifolds that are out there, or will be soon.

I don't know if any of them flow better, and Rotarygod I buy one if you make one for half the price as you said earlier....

Hey Nemesis8, Have you seen any new updates on the HKS Intake Manifold, I like that it has provisions for two additional injectors, will come in handy...

I will probably buy one to see if there is a better flow at the higher RPM's. If there is I thing
I will have solved my problem of the boost falling off a bit at those higher RPM's...

Anyways, you guys are Great, I love the communications we have .....I will do alittle more
research and talk to afew of the vendors you guys have posted about, and see what time frame of any New ones to hit the market... Thanks...

 

This is sort of true, sort of not. Plastic will not get heat soaked as fast as aluminum, but once it does, it will stay hotter for longer. Metal will take heat in quickly, but will shed it just as fast.

 

I think I remember reading that Mazda choose plastic instead of aluminium mainly because of the weight of it. If you compare the intakemanifold on the FD3s compared to the 8, the new one is lighter.

 

No new knowledge on the HKS from me, but maybe Japan8 can chime in if he is reading this. Those pics were from a show in Tokyo

 

Well, I talked with the guys at Acosta today about their Intake Manifold for the RX8..

It takes them about 2-months to fab and ship.. They did say that on the Greddy turbo I would see more HP than what they show for a NA motor... So I'am given this some serious thinking, I just wish it was'nt so much (1,599.00). I would feel like taking the chance more
if it was around the $ 800.00- $ 900.00 range...

I also talked to afew other vendors, and one has said he feels that it's not the lack of flow of the intake that is dropping the boost at high RPM's.... He told me that other turbo and supercharger systems show a drop also and that they have other intake manifolds.

So I hope soon we will figure this out, I would still like the Intake Manifold for the fact of
1. Safety, because I heard that under boost some have seen the plastic intake expand
and this over time this can't be good...

2. It would be nice to see a polished intake under the hood.

3. If , like in the HKS setup have two new injector sites..

Also I'am hearing some rumors to hang on for afew weeks, that I can do. But after that I must try something... Thanks everyone...

 

Make your own decision on this as it is only my opinion but I don't see any intake manifold being worth $1599. Theirs isn't even an entire manifold. It's only an upper manifold.

 

I don't think it is the manifold causing the boost to drop as other turbo kits can hold boost fine. I think you could find a much better use of that money.

 

Hey rkostolni, please explain which turbo out there is holding full boost all the way to redline.
I have'nt seen one yet...

 

I dont think it has to do with the upper manifold, I think it has to do with the last runners opening.