I wouldn't go to the trouble of making a new seq manifold and still use the stock turbos. I'm also not intrested in a single, or mass producing these. But any ideas on the best way to construct one, improvements that could be made over stock, etc.

edit-this is a step in the right direction: https://www.rx7club.com/showthread.p...=Feed+manifold

 

I'm not interested in a single, BUT, w/ a custom manifold that flows well, you know what you could get out of say the 99 twins or the BNRs?? And it's not just about flowing better and making more hp...we'd be talking about making high hp at LOW boost. Ie, if you can make 400hp at 18 psi, imagine making 400hp at 12 psi...mmm

 

Im with ramy on this one (I cant believe I said that). Id love to see the effort get put into a better designed manfold. The BNRs have shown that they are right up there with a single in terms of power but they would still have to use the good ol manifold we all know and love.

 

LOL...Neal, miracles can happen, eh?

Well for one thing, I'd really like to see what the stock twins are REALLY capable of. Rich mentioned in his dyno post that Bryna told him the stock manifold restricts power to right around 420hp...

 

I've been trying to talk Bryan (BNR) into spending some time making a equal length custom twin exh manifold. Then people that have his upgraded twins could send them back in and pay for a "additional upgrade package" that would be upgrading thier stage 3 intake and turbine housings, the custom twin manifold, and possibally a wg unless he can use turbine housings with built in wg's. I think it would be especially usefull for his latest upgrade that Rich dynoed.

So let me ask this.....how many people would REALLY be interested in it and would actually cough up the money? Also, how much money do you think it would be worth?

STEPHEN

 

personally I would be interested. The question is if it would have to happen soon. BNRs and if possible the upgraded manifold are on my wish list. This is just a shot in the dark but I would say $500-600 as an option for an upgraded manifold that is completly proven with numbers. This would be as part of the kit so I wouldnt know about just by itself. If you could see 500-550 realizable hp out of this, then Im sure they would make a killing.

 

 

The price would depend on how picky people are. If he used 5mm thick mild steel with 1/2 plate for the flanges which holds up GREAT and for the people concerned about it blinging you just have it coated. This type of setup could prob be had in the $1000 price range (my guess, I'm not Bryan so dont put my words in his mouth).

But if you go with stainless and all that the price is going to start soaring real fast.

STEPHEN

 

I would like to be able to put gt28 or 25 on the rx, i would imagine they would work very well..

 

I was thinking along the lines of a GT25r for the primary and maybe a GT35R for the secondary. That would be the shiznat.

 

Remember that you will need a large flapper door to turn the secondary turbo on and off, and a smaller flapper door to pre-spool it.

-Max

 

That's why an enlarged version of the stock manifold would have to be machined. The flappers would be difficult to work into a tubular design.

 

thats why it would need to be done by an experienced shop that could properly design it which will be tough unless BNR Is interested in doing it with their setup

 

Yea, I can tell you Bryan isnt going to get involved in trying to make a aftermarket SEQ exhaust manifold....he just doesnt have the time to dedicate to a project of that magnitude. Hell its taking me bugging him to death for him to consider doing a non seq twin set up.

No one will dump the money to experiment in making a seq exh manifold, its going to cost WAYYYYY to much to develope and the price would be SOOO high no one would buy it. Imagine the multipe prototypes it would require before it was "right" and how much it would cost to have machined over and over again till you got it right. In addition how would it be set up? You going to use the stock rats nest? Or maybe actuators with some manual valves on it? You have to consider the prespool and how hard that would be to engineers to make it work right given non stock turbos that are larger....blah blah lblah. I could sit here and type all night why its not feasable. This is why it hasnt already been done, if it was feasable somone would have done it years ago. Hell, I brainstormed about it years ago then came to the conclusion if I was going to spend that much time, money, and energy on developing a product it sure as hell wouldnt be a seq manifold for a RX7 that has a TOTAL customer base in the US of prob 5000 cars, half of which wouldnt know about the product and the other half couldnt afford it.

STEPHEN

 

I think the worst part would be the expense of the machining. You could adjust the duty cycle on the flappers, like wastegates, until you got the right amount of pre-spool. Sure, it's take some time, but not multiple prototypes. In fact, if you could design a tubular manifold that just used a seperate wastegate from the turbos for the prespool and a flapper door with an actuator set at a certain RPM for the transition, then the exhaust turbines wouldn't even have to share the same housing. And you could control the sequential just by electrically controled valves (wastegates) and the 1 flapper thus eliminating the rats nest.

 

Does anyone have a diagram of the Supra TT system?

 

interesting, if you can find all the parts for the elec. system to work right, and then someone brave enough to try out the setup on their car.

 

Can anyone host a pic for me, I drew something up.

 

attach it.... do a "Post Reply"

 

What about have the center sections duplicated in SS but having them bored out but they computer before it's cut from billet material. When it's finished they can be either plasma flame coated or ceremaic heat coated.

 

I did this with MS paint, so forgive my artwork, it's just an idea. I'm also a little unsure exactly how the prespool works so here are a couple of drawings.

 

BTW, FLAPPER should be replaced with a butterfly valve. In both drawings.