If you are able to pack the stock sequential controls in aftermarket components I'd really like to see that. That sounds ambitious.

Good luck with the project.

Do understand the others here - people come in constantly saying "I'll build a 4 rotor" and "I'll make my own twin turbo setup" and "I'll drop in a 6 speed - should be easy". We never hear from those folks again.

Dave

I like this guy! You got spunk kiddo! Hang in there & see what you can come up with. I for one, would love to see you pull this off. I remember some fellow who was around years ago, by the name of Albert Einstein. Look what he did. :nod:

^ I hate to say it, but I think the only thing the OP is capable of inventing would be a pair of velcro gloves...

Dude, no you cant. Just no. Maybe with a single. But, you'll never develope a working set of sequential twins that outperform the BNR's for less cash. Did you look at arghx's link he posted? It's incredible. That's what you're up against. Did you even look at the picture of SP's sequential twins for the supra? That's what you're talking about creating. And, they have so much more room to fool with that we do in the engine bay. You will fail. Or, in the case that you do manage to create something mimicking SP's supra setup for an Rx7 it will cost exactly 1 million dollars. You're not going to get away with duct taping two shitty mitsubishi turbo's to the stock manifold.

If you're such a mechanical whiz kid you shouldn't be asking us to interpret compressor maps for you. But, to answer your original question here are some turbos for your setup

*Two GT-25's or GT-28's
*Two T-04's
*Two shitty ass TD-05 turbos since that's what you heart is set on.

Figure out the A/R's for yourself and don't come back without a dyno sheet.

What about a compound turbo setup? A few people have talked about it but I have yet to see anyone try it. It seems like it would address the same issue of lag, without as much complexity as trying to build a sequential system. What are you looking to spend on a secondary turbo? I would ditch the primary too and go with a similar primary and secondary turbo. Masterpower makes a turbo that is very similar to the T28 but costs less, it has a bit larger turbine wheel exducer.

Here we go agin!!
I don't know if you don't know how to word things, but from what I read on every single one of your posts is an attack on my ability! you don't know me, you don't know what equipment I have access to....... blah blah blah!! If you think it's not going to work, then that is your opinion, but there is a way to word thing politley with out going on the attack straight away! I garantee a few people are thinking the same as you, but they just say.... I'm not sure you will pull it off, but all the best & good luck trying :)

also, have you seen the size of the blowers they are using on the supra? They are fucking huge!! I don't need anything that size! but you are correct, there is no way I would be able to get a pair of those under the bonnet! and god knows where you would get the "EXACTLY 1 million" from..... WTF!!! if I was doing cast manifolds & developing a completley new system then yes possibly! but I'm not ;)
I'm GOING TO remodel the mazda set up! It might not work as well as I hope, but then on the other hand, it might put all you doubters to rest & I sell the idea on for 1 million..... you just don't know! but if the second was to happen.... oh won't you feel stupid!

All your bluster just makes you look more and more incapable Jono. It's pretty simple really, if you had the knowledge and means to do this project than you wouldn't need to be posting in here asking us what to do. The fact that you have come here asking, and now insist on arguing with people who know this vehicle only makes you look childish and argumentative.

Grow the hell up and "put your money where your mouth is"... Come back with results or stfu.

I don't know why everyone is hating on this guy so bad. Let him try. See what he produces. Who knows?

if anyone has ever posted "making my own 4 rotor" on the forum, they've been flamed and ridiculed off the board...

...but it has been done. if a could of rednecks can build a running 4-rotor by slapping together (2) 2-rotors (with 2 13b-rew intake manifolds), why can't this guy ghetto-hack his twins to accept a different chra?

I say, get to it! Keep us updated. :)

You and me are a lot alike. Do yourself a favor and ignore all the negativity. The doubters are the one's that 1. Have never attempted to try it. 2. Dont' have the skill. 3. Read everyone elses post and base all their knowledge 2nd hand. 4. Think they are know it all but haven't done a damn thing themselves to prove otherwise. If you have the resources, you can get a lot accomplished fabricating yourself (which is what you claim you can do). I don't know Barban but seriously, you have to question his own knowledge about the subject since he wanted someone to find Howard Coleman to confirm his opinion. That tells you right there that he doesn't know himself; yet he's the most negative poster in this thread.

It doesn't take a ton of money if your innovative. Look at my sig. Everything on my NA 20b project I fabed myself. Subrframe! Complete exhaust header flang to exhaust tip. Made my own intake from engine flange to ITB's with working secondary shutter valves. My engine is move back 5-1/2" and keeps the steering rack in the stock location (no bump steer) and has as even lower center of gravity and polar moment than the factory set-up. Fabed my own tranny mounts and diff mounts. This allowed me to elliminate PPF. Relocated the shifter ect ect. All this was done im my garage like shop with my 3 in 1 plasma/stick/tig machine. Mig welder, miter saw, roto zip (w/accessories), and misc drills/taps & dyes. You get the idea. I've done thousands of dollars worth of fab work for penny's. The engine runs and holds idle at 750rpm's. What your wanting to do can be done. Good luck! ;)

Agree 100%! We are here to help each other & shouldn`t be here for beating each other down when someone wants to try a new idea. This place is a wealth of information with many folks present who have done some very interesting things or solved some really difficult problems. Working as a collective group, there is no telling how many new ideas could be brought to reality.

Great contribustion to this thread. :icon_tdow. He's not aksing how to fabricte the set-up. He's trying to get an idea of what turbo to use. Just because he may know how to fabricate, doesn't mean he understands turbo compressor maps and such.

Exactly! All the R&D can't be left up to Mazda. They need help also.

Cheers for the support guys.....

And t-von you are correct in the fabrication & the fact I haven't taken the time to figure out the compressor maps ;) I thought a simple question in the rotary club like this, would come up with some useful advice on the turbos as to what would suit my application best.... there have been a few sujestions made, and as of yet I haven't looked in to reliability or ease of access to the turbos.... but I have a sneeky fealing I'm going to have to learn how to read the maps and leave the asking of simple questions!!

J

There is plenty known about selecting single turbos.

There isn't much to be said about selecting turbos for sequential apps because so few people have attempted it that way. You'll just have to crunch the numbers and design it yourself. You either have stock turbos, 99 spec turbos (similar to stock), BNR 3s, etc. But those use the stock manifold and control system because re-creating it is cost prohibitive. Nearly everyone with this kind of involvement opts to go single, 20B, or v8 simply because it's perceived to be more bang for the buck (in sweat equity) than re-engineering the sequentials.

I wish you good luck. It can be done, certainly but it will be complicated and probably expensive. IME, weldable materials that can hold up to this kind of heat (except cast iron) are really expensive. Making the manifold will be a challenge to be compact, welded construction, and good flow characteristics. Nearly everyone with this kind of involvement opts to go single, 20B, or v8 simply because it's perceived to be more bang for the buck (in sweat equity) than re-engineering the sequentials. That said, a well done sequential setup combined with auxiliary injection could be a real sight to behold. The lack of space to work could be offset by the space created in removing stock emissions equipment.

I know someone did this project before but I can't find the build thread for it. I recommend you search that one out because it was very interesting.

There's a thread on reading compressor maps in the single section. Also, you may have some luck on Ray Hall's website if you can figure out how to adapt his great calculators to the rotary.

SP charges 11k for their sequential system, they've also done all of the R&D on the plumbing. I highly recommend that you read all of that thread before you start your build as it is the only tubular manifold sequential twin turbocharged car in the world (that I know of).

I'd also encourage you to look at compound turbocharging as dudemaaan suggested. The plumbing on true sequential turbos is necessarily complicated and expensive.

http://spracingonline.com/upload/fil...pseqcoated.jpg

^ I see a cast manifold in there. Not exactly DIY stuff.

always game to lift the bar a little ;) if it doesn't work out as I hopes, atleast I gave it a go.... but all the air pump, cats etc have been thrown on mine already, so there is a fair bit more room in the engine bay already!, just got to get my engine built so I can start playing with the manifolds & blowers!!

Cheers
Jono

good for you man!!! too many people now-a-days are too freakin narrow minded... I believe sometimes you just have shut the hell up,stop making accuses and just do it.... what ever it may be

Interesting thread..... I believe 2 Super 60's would do well. This also depends on your power goals. I didn't really see anything posted on this.

http://www.spoolinperformance.com/ga...er60-p-33.html

Look forward to seeing pics of this. And if you really want to shut the non-believers up..... post em up ;)

Here is what I allways wanted to do but too much fab work that I can't afford and can't do myself. There is no need to run sequential with this setup since you are seperating each rotor. You could also run two O2 sensors and tune them individually:

Two manidolds
two GT25's
two "internal" waste gates
two TIAL v-band compressor housings
two BOV's


If you are reaaly skilled you can mate them up to the Efini Y-pipe kit. Fab up a flange and make it bolt up to it. This makes mating up to the intercooler much simpler. If you can actually acomplish this, you can sell it it as a kit replacing the oem twins.

You can use BOV that return back to the intake box.

You can do dual exhasut all the way (dual in/out single magnaflow muffler) to the tip ot merge them together just before the cat' converter, if you even use one.

Okay, well maybe we should tell that to Rain Man, because he practically bankrupted a casino, and he was a ri-tard.

here, since bnr turbos just cant quench your thirst, buy these bro,
https://www.rx7club.com/3rd-generation-rx-7-1993-2002-parts-99/went-single-knight-sports-rf420-twins-902860/

Those turbos are sold!!!

If you can dream it you can do it. But... If you are going to do it do it right. That being said using td0 what evers is joke. Take the time and build a quality product. As far as turbos the BNR's are considered gt28 internals, and are known to have a bit slower spool because of restriction and usually bump the transition up around 4800-5000RPM... So if you are building you your own well flowing manifolds I would run a GT28 on the low side with proper flow it should spool up very quickly like the stock system but make a bit more power and a GT30 on the top end. Allowing you to retain the 4500 transition but make heaps more power. I am a true believer in knowing this can be done once you break it down its not that complicated if you can fab your own stuff all it is is flapper doors and solenoids. Just takes a bit of creativity and some ability.

Chris

This!:)