Porting the throttle body is going to show minimal benefits, as is porting the manifolds.

You mean a header?

Totally unnecessary. That pump will support a 400HP TII.

All Mazda apex seals are the same except the Renesis seal.

Have you checked the "how to make a beefy n/a" topic in the Archives?

 

Yeah i have I also did another thread where you told me about that um no not a header I hate those header I mean it might be lighter and louder but they are more expensive and if they are not very durable (as in they could get dented)

 

and not trying to be mean aaron but If it only does minimal power well to tell you I'm going to try my best to get alot no matter what I want to be the first person with a 200 hp n/a without nitrous

 

go stand alone. megasquirt or something. get rid of that stupid afm. your well on your way to 200

 

god i couldnt even read what you first posted because that annoying smiley keep blinking at my face and made me feel like i was about to seizure

 

hahahah that is funny

 

Seriously man... Punctuation? Capitalization? Your **** is so hard to read!

 

Matt, the 3-piece apex seals actually did a better job of gas sealing along the seal's groove, but they had a nasty habit of splitting lengthwise and causing problems. The 2-piece seals are now the norm, and the OEM seals seem to be the most housing-friendly for the kind of driving you will be doing. Mazda has done tons of R&D over the years to come up with the current design. OEM FTW!!!

 

Is 1 HP worth 15 hours of work?


You will NEVER hit 200HP without a header. Never. The stock exhaust manifold is a bit like a bathtub. Lots of room for the gasses to collect, but only a tiny drain to let them out. A header is KEY to pulling the exhaust out of the engine.

If you want 200HP you will need a healthy street port, full exhaust, full standalone and a good tune. Even then it's going to be very difficult to get 200 wheel HP out of the S5 NA engine without more radical porting and custom manifold work...

 

sorry to burst your bubble, people have hit 200 rwhp on a 6-port n/a. Search around in the forums.

 

yeah that exhaust manifold is heavy and flows like *** in comparison to a header.

^^ pretty much right on the nose.

I have 3mm apex seals, not by my choice - the last owner had the motor rebuilt and those installed, but its def possible. I still need to give it an rx8 e shaft, s5 rotors and a bigger port job but my 7 is still zoom zoomin

 

190rwhp is more realistic even with those mods IMO

 

My friend had a header custom made for $100.

 

Well I don't know if but you can have your exhaust manifold probably ported also. I mean I don't see why you can't. Yeah i think 15 hours of work would be worth it to tell you the truth. As long as it doesn't cost alot i mean who doesn't want 1 hp i mean it is better than not having 1 instead of none.

 

There's nothing you can do to the exhaust manifold to make it flow like a header.

Long tube headers are tuned such that the diameter of the tube and length of the primaries match the exhaust pulses from the engine. The header keeps exhaust velocity high by providing each rotor with it's own dedicated runner. The merge point is placed so that the exhaust pulses from one rotor pull on the exhaust pulses from the opposite rotor. This greatly increases scavenging of exhaust gasses and sets up the working chamber of the engine with the lowest pressure possible as the intake port opens up. The result is greater chamber filling and more power. The engine spends a lot less energy to push it's own exhaust out.

Contrast that to the stock manifold and you can see where problems begin. There's virtually no tuning involved. Both rotors push into a cavity and the exhaust must swirl around until it finds it's way out. This is done primarily for emissions, to assure complete combustion of any unburned hydrocarbons. As each rotor pushes out exhaust, it must fight the exhaust pulse from the other rotor. The result is virtually no scavenging of exhaust flow.

One HP is well within the margin of error for a dyno, and if you don't port the manifolds correctly (removing the lip where they meet the engine is not necessarily a good thing, neither is smoothing out the runners) you will lose power.

 

Why not just Peripheral Port it?

 

what is that.

 

Not exactly the best idea for a street car..

 

It's not, especially if you have to pass emissions.

Large streetport with S5 manifolds and a good exhaust is what you need.

 

OK that sounds good.

 

S5 stock exhaust manifolds fit on the S4 nicely? Is this a worthy upgrade? or should one save up and go aftermarket?

 

I mean the S5 intake manifolds.

 

They are the same, and both are worthless piles of crap as far as power is concerned.
As for the s5 intake, here is how to do it: http://howto.globalvicinity.com/gv_w...i=63&co=1&vi=1

 

I think this is going cost alot of money so i'm just going to rebuild the T2 in the garage port it any everything i just need to know does anyone have Blow off valve that i can pay for i mean yeah i know this is the wrong area i just want to know.

 

www.fuji-racing.com



You are going to port, get a new enxhaust, and a standalone. The added expense of ITBs is, IMO, worth it. Better throttle response, increased mid-range and upper range power, incredible sound.

If you want to get the most power you can out of an NA engine the intake will have to go. Sure it will work, but it wont get every last hp you can out of the engine. To get 200rwhp out of a streetport you are going to need every last hp out of the engine.

BC