Ok, im bored lets make something crazy lol flame suite is on. So i have two T-25 turbos laying around (from a TT Z32) and sense one i beleive is to small for a rx7 i was thinking bolting two on. The car is a 86 n/a, the car is beat and junky but the engine is strong. Just looking at opinions on this and other ideas that you guys have. Basicaly i would have to make a custom manifold for this obviosouly (dont think the FD would work with this). For intercoolers i have two Z32 side mounts that i would run for each turbo then make a y-pipe to the throttle body. Then proably run a FMU or S-afc. Whats your ideas? Is it even possible that it could fit or work? It would be cool to do a remote mount turbo but with Twins i think that would be even harder. Just looking for ideas good or bad let me know lol.

 

bad. the n/a blocks arent made for boost, your ignition will be suppppper lean. theres alot of writeups about doing turbo setups on n/a's its alot of custom work and alot of money. do a itb setup bump up the injection, standalone ecu and port the engine. best way to go with n/a youll get the same numbers with a proven system.

advice if you do it, bigger injectors, oil cooler, upgrade your radiator (koyo) you could run the turbos as sequential turbos one to another and be way different then everyone else? ahha theres not much room for turbos though.

 

If you want to use those two turbos you will need a custom manifold for sure. You will have to set them out from the block using some kind of extension off of the exhaust ports to allow room for the intake manifolds, and align turbos as if they were set up for an inline 6. Meaning they are one side of the motor. Remote turbos are cool in their own right, but going out of your way to really sacrifice performance just to have one turbo on each side of the engine is lame.

Think of the monstrous difference in exhaust runner lengths to let that happen. Not only that, but the piping necessary to use those two intercoolers in tandem would be pretty superfluous unless you pretty much put them back to back; in which case it would be simpler just to use a larger intercooler. Using the N/A intake, you would have to return the air to the same side as the turbos anyways.

It would cost lots of money, but yes it can be done. In most cases like this, you can do anything you want if you throw enough money at it. But the question is why do that when there are easier and cheaper ways to make power?

 

Shut up.


Yes, you can do it.

Infact, r magic has a twin turbo tdo5 3 bolt flange manifold FOR the fc on ebay right now.

If you're running internally gated twins (which would be alot easier than running twin externals), the downpipe and merge collector (for the downpipe) should be an easy fab. My guess would be to run an ebay TT intercooler. It has twin inlets and outlets.


You'll need room to run your afm and a merge pipe for it so the stock shroud/fan will have to go probably.

Yeah. You can do it. Just dont listen to these homo's telling you that you can't or it wont work. They're ignorant or old or both.

And obviously this is going to be a parallel setup, non sequential so why not? If you're using t3 or t2 flanged turbos, upgrading the twins is cake. You could run 2530's for really good response, not sure about the top end but as long as they aren't ball bearing, upgrading and making hybrids shouldn't be a problem.

DO IT! Ignore the banter of morons who would rather buy off the shelf ****, go big single or whatever. WE NEED MORE PEOPLE WALKING THE UNBEATEN PATH!!!!!!

I highly recommend you get a megasquirt for this though. $400 stand alone unit. You can ditch all the stock crap that's just going to hold you back and tune whatever parameters you need to get this thing running proper. YOu could run an fd fuel pump/300zxtt pump or a cheap walbro 255 with quad 850's and be set on fuel. Probably more than you need for those turbos. IIRC they're .48/.48.....

 

203 mph

A 13b has exhaust pulses more similar to a V8 than a V6, those turbos (t25) are sized for half of a mid sized 6 cyl they are Way too small. Many people swap T25's (or T28's) onto Miatas and it works great, but try putting the stock HT-18 on a miata, it won't spool till 5k. You could of course upgrade them, but isn't the whole point that you already have them lying around?

It's not that a twin turbo setup can't be done on the FC, simply that for the power you get and the cost involved, there's very little point. Unless you alread had the (properly sized) turbos, and the requisite fabrication skills to make them work......which Im guessing we don't since the thread title is "Ghetto Turbo Idea" and not "Look what I did!!!"

 

If you cant cut steel and weld it together you should learn. It's not difficult at all really. Whenever i get gas for my mig and a band saw it's on like donkey kong. Schedule 40 turbo manifolds!!!!!! Wont crack, holds heat like woah and strong enough to but twin t6 turbos on if you wanted to.....plus cheap. CHEAP! CHEAP AND GOOD AND FAST.

But yeah, if you keep each turbo on a separate runner, they might do ok but you wont know till you try. Mocking all this **** up and cutting/marking the piping is fairly tedious but if you can see it in your head how you want the setup to sit then this shouldn't be a problem at all. You can fit twins in the bay, however i'd have them both sitting traditionally. Inlets facing forwards, side by side.... not like the forward/rear 1j/2j/re/rew twins.....

Ah, and buy a hole saw and some rubber grommets. You'll need to cut some holes up front for piping. As long as you leave your frame rails alone, no worries there. Switching to a TII intake manifold or fabbing your own uim to have the tb facing towards the drivers side would be in your favor. Yeah, there's cheaper ways to make power but it's nice to see someone doing something that not everyone else does. Oh, just TII swap, oh, just put a big single on it, oh just stfu...... I hate those guys. I'm planning on 13bre swapping my car should i decide to keep it and buy a dd. Is that the cheapest way to make power? No, is it the most practical? No. Is it cool? Hell yeah it is. It pretty much bolts up too and lotta headache saved just from deleting the rats next and runing the twins non sequential. Oh, yeah and it's cheaper than a TII swap. Big deal, cheap fuel pump and intercooler needed but all my n/a accessories bolt up, i could use an fd ecu and harness and all is good still comming out ahead. The quirks of the TII engine just aren't there and i'm getting exactly what i want for less money up front. I change my mind often though so what looks good today might not look good tomorrow but if you have the time and willpower you can do whatever you want.


I almost want to direct this man to the proper website....but they'll eat him alive and call him a rotard....

You know exactly what i'm talking about.

 

There was a guy running twin t25. It was turbo off a nissan rb20det.
This was a mininum of 3-4yrs back, so I am not sure if the thread is still here. But you can searched it anyway in canadian forum.
He was an engine builder (built my motor) and a fabricator, so he build his own manifold, exhaust, fmic pipings etc etc.
But when all said and done, he was making around 320-330 whp @ 15psi.

 

His motor was an s4t2 streetported. If I remember correctly, the dyno grap was similar to a supercharge motor.

 

well, here it is (surprisingly):
https://www.rx7club.com/showthread.p...&highlight=t25

and dyno day:
https://www.rx7club.com/showthread.p...&highlight=t25


And that car is parted out now already, not sure if he still kept that set up at his shop.

 

Thread cleaned up some. Everyone place nice or I'll lock the thread.

I should point out that the OP hasn't even replied, yet you guys are all in here arguing with one another. Keep it on topic already.

 

Thanks for the clean up. Playing nice

Good thread as it is now.

 

Yes, you should do this. Sounds like a cool project!

 

I like you and your ideas. need more people like you in this world.

I have all the nessacry tools to do this, welder, cutter, grinders ect. I will admit im not great at fabricating but i think i could pull it off.


Thats exactly what i needed to say. Now that i can actualy picture it with out my imagination theres alot more to go with there. Currious how he is gonna run a p-side head light though. The hardest part is gonna be making the manifold, i dont know how i would go about making the plate that bolts to the motor with out a advance milling machine. Maybe by a cheap ebay header or something then cut the pipes of and go from there. Hmm.

 

Well, you could buy one from racing beat. Maybe pineapple racing. They do make 13b flanges you can buy and there are some doods on here who would be MORE than happy to machine one for you.

I would not recommend buying a cheap header or turbo manifold and welding off that. The material is inconsistent and dirty. You're going to have TWO turbos, a heavier downpipe, intake piping.....alot of crap hanging off of this thing....that's why i recommended sched 40 but if you buy a flange from a reputable company or have one made out of THICK mild steel to weld your runners to. My god. It would be heavy but sooooooo strong.

I'd make a template, buy some 1/4" to 1/2" thick mild steel plate and take that ish to a machine shop and have em cut it out on a water jet. As far as milling it, you'll want to do that AFTER you weld up your runners.

You can mock everything up with wire ties, tape,pvc OR tack welds+your flanges/piping/turbos. Picture it in your head and build it slowly from that drawing in your head. Even go as far as to make a rough sketch if you have to.


Now, your turbo flanges themselves, you can buy. Just search for what flange and in what material you want on google. I do advise that if you use mild steel for your runners, use mild steel for your flanges too, like metals are easier to weld to one another and are a stronger piece. There's other factors too but that's a big one imo. OVERBUILD this manifold. Any ugly can be fixed with exhaust wrap.


I haven't checked the links posted to the custom tt build yet.... Had to get this out of the way before the rotor ****.


I made it to the second post with pics before i came. I'm sig'n that thread!

 

Wow. WOWOWOWOWOWOWOWOWOW! Someone correct me if i'm wrong but are his oil returns going to where the omp used to be? I pulled mine off a while back and threw a plate on it so excuse me if i'm wrong. If that's what he's doing, it wouldn't be crap to put a bulkhead fitting into a blockoff plate to use that for a drain! Cool stuff! His piping is beautiful!

Ok, i'll stop nutswinging now. Funny b/c i searched EXACTLY for "t25 twin turbo" early this year and didn't come up with squat. Search function pwns me.

 

Well in the fall i will have access to a full on water jet (at the college) and cad softwear when i go back to school. Also the welding/machine shop i aslo got. i love my highschool lol. But idk if i want to wait intill setemeber/october to get this going.

 

I just would think that the t25s would be too small, maybe twin GT25s or a T28/GT28RS sorta setup but that would act like having a supercharger with that little of lag and how quickly those turbos are gonna spool. Would feel probably like half bridged NA or something.

 

Well, maybe you should. That will give you time to research fuel and spark tuning.

You're gonna need something.... I mean, if you're going to go as far as do your own cheap twins kit you may as well research cheap ems and fueling options. These things get thirsty when you pump up the boost. Also, figure out what each turbo flows cfm wise and at what pressure. Check and see what your wastegate actuators open at. You dont want to bolt this up NOT knowing how much air is going into your engine and what psi your wastegates are cracking/opening at. If you can compare the combined cfm of each turbo to another setup, you'll know where you need to be roughly with fuel. You can get started with the fab after you get a foothold on everything you're dealing with and like you said, you have the time to do this before september/october....

I highly recommend sourcing TII fuel rails, injectors and FULL intake manifold at the very least, bigger injectors and plan to make a drivers side facing TB upper intake manifold....which shouldn't be hard at all with the tools you'll have on hand.

 

Can-do-it attitude.........check
Skills..............................check
Tools.............................check

....In that case, why not look into a setup that might actually be worth the trouble .... like perhaps a compound setup?

http://forums.hybridz.org/index.php?...31-v20-update/

Obviously w/ a more appropriately sized second turbo, lol

 

Do compound turbo. That's my next project. Twin disco potatoes...

 

I like how he says "it's a stock engine, so i have to leave it around 800whp"

Like it aint ****.....

It isn't as far as what the motor can handle but he just brushes his nose at 800 horse.

Correct me if i'm wrong but i thought compound turbo was two different sized turbos. (not TWINS, i.e. running TWO identical disco's with one outlet feeding the other's inlet) One big one feeding a small one. The small one provides the low end and the big one provides the top end. Matching that setup on a rotary would probably be a huge pain in the ***. Any links to existing, running compound rotary setups?

VERY interesting.

Op, sorry. This thread might turn into an aftermarket twins cornucopia info page. You should post pictures as often as possible. Even if you do small little things. Keep this thread alive!

 

Lol, I agree. Wish I were bored w/ 800hp....

Correct, compound does stipulate a small feeding a large, which is what I am suggesting. I maintain, and infact the thread in your sig damn near proves (as I believe those turbos were larger), that doing anything w/ these little T25's is an excersize in futility.

Keep one, sell the other and get something with a little head room. I don't claim to be an expert (and unfortunately I cannot link to any compound setup rotaries) but I agree that some sizing issues may need to be addressed. The fabrication shouldn't be much more difficult than running twins.

At first glance it would seem that since the secondary turbo gets its airflow from the primary, it would be restricted by the CFM cababilities of the primary (which would toss the T25 out the window) However, looking at that 2JZ thread, that does not appear to be the case in practice....

 

go compound.

 

I can look up the compresser maps on TT.net and can post them here, unfortnaitly i dont really know what im looking at with those. I believe T-25s wasgates open at 7-8psi if i remeber. I can test them here at home, my dad has this box that can give exact amount of air pressure that he got from the nuke plant. I dont think i will go with a compound setup, maybe in the future i could but right now i think it wuold be best to start with the twins.

 

t25 opens at 7psi