Remove the twin scroll from the turbo manifold and weld over the small pin hole port and polish intake runners and have fun.

 

Thats supposed to be an "upgrade"? The turbo response you lost and torque now missing isn't made up for by the 1~3 hp you gained up top. Want to upgrade it? Get a s5 turbine housing and manifold and slap a T4 compressor on there. While your at it, port the wastegate so you do't blow it all up along with some added fuel.

~Mike..........

 

The flapper door is a terrible restriction and there is plenty of pressure in the manifold to make this a good up grade.

It's like having a door in the middle of a waterslide.

Anyway the right move since your talking about using a setup outside of stock would be Corky Bell's manifold which is an S5 style manifold with a 38mm external wastegate.

There is also another upgrade that can prove that this is a valuable upgrade without posting dyno number is the throttle body mod or the s4 turbo match port would only be a down grade according to your knowledge since your messing with the back pressure that the twin scroll creates.
Bottom line is if your doing either of these mods then you are not stock if you were you would be wasting your time because you still have fuel cut and it would be pointless but either or both of these mods would be a good upgrade for your car.

 

yeah, and there is still a big door in the turbine housing, so were's your gain comming from? This mod is as pointless as those idiots wirering their 6 port inductions open all the time or gutting them completely on n/a's. Were's this Corkey Bell manifold? I've never seen a product from him for any rx-7. And if it's s5 style, then it would run one runner/rotor to each side of the turbine........ which would be a stupid idea on a s4 turbine, as the turbine housing scrolls have different A/R values creating un-equaled exhaust pressures and tuning from the front rotor to the rear.

~Mike.................

 

[QUOTE=RacerXtreme7;8397294]yeah, and there is still a big door in the turbine housing, so were's your gain comming from? This mod is as pointless as those idiots wirering their 6 port inductions open all the time or gutting them completely on n/a's. Were's this Corkey Bell manifold? I've never seen a product from him for any rx-7. And if it's s5 style, then it would run one runner/rotor to each side of the turbine........ which would be a stupid idea on a s4 turbine, as the turbine housing scrolls have different A/R values creating un-equaled exhaust pressures and tuning from the front rotor to the rear.

~Mike.................[/QUOTE
Acually it is the setup your talking about with a T04.

 

[QUOTE=Agent Orange;8397329]

 

Strange, you edited after I posted a response.

You totally didn't get my point at all. It had nothing to do with "There is also another upgrade that can prove that this is a valuable upgrade without posting dyno number is the throttle body mod or the s4 turbo match port would only be a down grade according to your knowledge since your messing with the back pressure that the twin scroll creates.". My "logic" which so you assume didn't state anything at all about port matching or throttle body mods. Match porting and the throttle body mods have proven beneficial. I think you simply don't understand how these individual parts specifically the s4 twin scroll actually work.

And I gave the s4 turbo to s5 manifold and turbine / port wg mod being it’s still semi stock as it’s an OEM part, just on a newer model, so how you get equate this as a full t4 upgrade is beyond me. Useless thread, and it’s not in the correct section, should be in the 2nd gen section, but seeing as though this mod (s4 twin scroll ) has been discussed a billion times and this particular thread has no new nore accurate information from the OP it just should get deleted rather then moved.

Sorry to bust your bubble or be the *** to point it out, but you sound like an un-experienced kid passing on BS fluff you read from another interweb genius.

I'll leave this thread alone now and wait for you to have the last word and bestow witty explanations of ubber rotary knowledge to whomever reads this .


~Mike.............

 

"Anyway the right move since your talking about using a setup outside of stock would be Corky Bell's manifold which is an S5 style manifold with a 38mm external wastegate." And you mentioned a T04 setup and I corrected what you where trying to do with a better solution since the guy is a Thermo Dynamic Engineer. rather than an *** that is going to put a T04 on a stock manifold. And Corky Bell created an intercooler and a manifold for the rx7 when he was with cartech before it wen't bad. Ubber, bestow, visa vee, Concordedly!

Later.

Delete this thread.

 

Removing the door from inside the exhaust manifold and welding the resulting hole shut IS a performance increase. That door is a restriction. Why does your car surge with power when the stock door opens? Its because the door was holding exhaust flow back. Why do you think mazda changed this on an 89 ? Its because the door was a solution to a problem that didn't exist.