Hia guys, I'm going to be doing a custom sequential turbo set up on the new engine being built. basicaly what I am planning on doing is replacing the secondry turbo for a larger one, but the thing is... what shall I use??

I want to keep the sequential setup as I love the power delivery & drivability, but I would like a little more go at the top end. So my question to you guys is: what turbo to use? Don't want to go too massive, but again, don't want to choke the cars performance! I was looking towards the TD05 from the Mitsubishi evo as they are a strong reliable turbos and easy to come across, but some people say the hot side of the blower would choke the engine? Running the TD05 as a single I would agree, but as a second would it not be about right??

Anyway, advice & guidance is welcome.
Cheers
Jono

P.S. I know there will be fabrication work to be done & it's going to be time consuming to make it.... but this is all part of the challenge to me

 

The problem you are going to run into is the cast iron manifold. Easier and cheaper to go with the bnr twins.

 

I'm going to be fabricating my own manifold in stainless pipe, so no probs there just the Turbo is my problem. Plus I can't aford to by aftermarket twins on a tight budget as I have just bought a house & I like to do things myself...... just to proove the doubters wrong LOL

Fabrication work for IC & turbo pipe set up:

 

I'd probably go w/ twi GT25's or GT28's.

You get THAT to work on a high-flow tubular manifold, gimme a call.

 

BNR's are basically GT28's

 

realy looking for something from a mass marketed vehicle as there will be plenty of them around at respectable money, hence why I was looking at the evo's TD05

 

The cost of aftermarket twins will pale in comparison to the cost of fabricating your own setup. You're also not going to be able to retain the sequantial operation. I suggest you either stick with what mazda gave you, get the BNR twins, or go single. There is really no reason to go with aftermarket twins.

https://www.rx7club.com/single-turbo-rx-7s-23/15-000-miles-twin-t04s-daily-driver-450719/
https://www.rx7club.com/3rd-generation-rx-7-1993-2002-parts-99/howard-colemans-twin-to4-turbosytem-507-sae-%40-20-psi-866035/
https://www.rx7club.com/single-turbo-rx-7s-23/twin-gt28r-turbo-kit-pics-387757/

 

you can't go sequential with an aftermarket manifold. Do you know how the sequential system works? See this article: https://www.rx7club.com/3rd-generation-specific-1993-2002-16/why-engine-so-damn-complicated-part-1-sequential-turbos-demystified-841821/ first and 2nd post are most important, the other stuff is kind of esoteric

 

On the contrery my good friends, The manifold will cost me about £20 in materials, then it is just my time to make the manifold up. I will be doing all the work myself so there will be very little cost in sorting it all out, just time! As to how the sequential system works... yep I understand that well, which is why I have a spair manifold that I will be taking the prespool and turbo control system out & fitting it in to a Stainless tubular manifold set up

Jono

 

My guess is you'll post here a couple more times and then we'll never hear about it again.

 

Nop, I'll be around for as long as I have the car I'm always up for getting more knowlage about the old rotary workings & tuning!
but it would be nice to have a few more turbo sujestions LOL

At the end of the day, if we all whent down the same route.... how boaring would life be?? I had a load of people telling me not to bother doing the custom turbo pipework from the turbos, but I did and the benafits were huge, even with a massively oversized IC which would aparantly destroy spool up time, but I'm now hitting full boost about 600rpm sooner than people using the mazda system. So it pays to experiment, even if sometimes you don't get the benafits you had hoped for

Jono

 

I have wanted to do this too, garret seems like they support sequential mabye you could work something out with them but i agree, the manifold would probably have to be machined out of a block of iron or cast.

k04 from the VW/audis

 

The pioneers are easy to spot in a crowd. They are usually the ones with all of the arrows in their backs. I too, have been out in front doing what alot of people said couldn`t be done. If you are creative enough & have the patience, should be an interesting endeavor. I wish you well on your project & hope that you are successful! Keep us posted.

 

mabye you could make an adapter plate and use the stock manifold?

 

Think the stock manifold will be too restrictive?? a nice tubular stainless manifold on the other hand would work well
I'm not realy worried about mounting the turbos in the stock position..... Primary would have to stay roughly where it is, but the second can sit above it, or in the same position as a single turbo mod, so space for pipework shouldn't be too big a problem

Jono

 

Find the thread on the supra forums about the SP (Sound Performance) Sequential Supra.

http://www.youtube.com/watch?v=JBn7hivnePU

Good luck doing this on the cheap.

 

There is a thread in the Single Turbo section about how to size a turbo. Do the math and try and find a part of turbos available on OEM cars that fit the math.

 

ive had a hard time finding out how the supra twins work but they dont seem to be truly sequential from what i can find.

it seems like 3 cylinders run each turbo in the same fashion a v6 twin turbo would, compared to the rx7 were both rotors can spool up the first turbo.

 

See, what you got here is a buncha old timers that seen this play out about a dozen times telling him, "it cant be done" and a buncha rookies what dont know dicks from elbows telling him to, "go for it."

Somebody get Howard in here. He'll set the record straight. It's not impossible. It's just impossible for you. You dont have the room, the technology, the machine shop, or the bankroll. Thats it.

 

but if you had the bank roll, go for it

 

I don't know where you got that, but this is the stock sequential supra which isn't at all like the SP sequential supra that I suggested you look up.



SP sequential



Link

I really don't mean to be offensive, but it's my humble opinion that you're out of your league.

 

Things like this wind me up.... You don't know me, you don't know what I do for a business & don't know what I am capable of doing!

As far as you know I could be an ecentric millionair, who has his own machine shop & doesn't give a flying **** how it comes together aslong as it works! And as for the old timers.... they are the ones who ask people like me... how do you work the DVD player, what's the difference between high def TV and normal satalite...... blah blah blah! You get the point?

It's going to be done, It's going to work, it's gonna cost me a few hundred pounds, and alot of people are going to be shocked & congratulate me on getting it to work against the so called odds!! all I need to work out is what turbo to put in to the system!

Come on us "ROOKIES" lets show the "old timers" what lives next to your dicks, and what a decent set of ***** can help you achive!!

J

 

after you said
and you're already limiting your options(you obviously didn't look at the very useful links I posted for you.
Well, that's not going to work
Well, that's not going to work either. You'll not be fitting a sequential, stainless, tubular manifold in the space of the stock cast unit
You could have purchased Howard Coleman's USED, WORKING, non-sequantial set-up for $1500 without ECU and fuel-system. AN ABSOLUTE STEAL. You might find a turbo worth a hot-god-damn for "a few hundred pounds."
Wrong. It will be one of your biggest problems. Right up there with figuring out to operate and control your sequential system.

You said:
and we said
Between your lack of spelling ability and your statements I am telling you that
1)this will never get off the ground
and
2)you want BNR's

 

Don't go sequential or twin, they both fail.
Mazda never caught on to the twin stuff and most RE-W's died at about 85k.
Convert to a single and own

 

I know that the BNR set up is a great one, but I cant justify spending £600 on a second hand set, when I can make something for less than half the price & make more power. it's just the case of working out what turbo I need to invest in. The way I see it... why follow the trend like a lost sheep, when you can experiment & come up with something different?

The thing that pissed me of most was the fact you used:
"it cant be done" and a buncha rookies what dont know dicks from elbows

granted my spelling isn't that hot, but that doesn't have any reflection on my knowlage & abilities! A bit of an extreme example: stephen hawkings.... a vegitable, paralised & unable to comunicate, but would you say he is thick & useless?? No, he is one of the best minds in the world!

Also I wouldn't be shouting too loudly about spelling, when your grammer that bad!! "buncha" surley that should be "bunch of" and "what don't" mmmmm, could that be that don't?? LOL don't forget my young friend, you are only 25 yourself

Anyway, I'm going to go now... I'll show my face once the project is all finished & working, just to show you all sorts of things can be achieved when you put your mind to it!!