I'm kinda planning to perform a custom twin turbo conversion on my FC. I'd like as much bottom end response as possible, high HP single turbos have lost me.
I'm hunting around, trying to find a cheap, available factory turbo that has an internal wastegate, and spools up quickly.
NZConvertible suggested ceramic bearing GTS-t turbos in another thread, but i'm thinking they would be quite big (wouldn't they?) other than that they sound pretty spot on (bearing equipped/internal wastegate)

with internal wastegated turbos, all i'd have to worry about is:
having a complicated custom manifold to mount the turbos.
exhaust modification.
and a pipe to merge the two compressor outlets into one pipe that feeds into the FMIC.

I've got my eyes on either a Haltech or Autronic to run it.

So yeah, any other feedback on good turbo candidates would be appreciated. The world of the turbo specs of the myriad cars out there gets a little hazy for me.

ps-twin T28's from a 300zx perhaps?

 

The stock Turbo's off a 1jz Supra / Soarer ( Only japanese models ).... reliable up 2 15 psi, but they are seramic turbo's for real quick spoiling, I imagine you could get them pretty quick from someone who is doin a 1jz swap here in the US, going to after market turbo's...

or you could even try the MKIV Supra's Twin's...

 

supradoom7, nice to see another person from wisconsin

 

16g's I know someone (not gonna say who) a big time thirdgen guy that is thinking of doing this, This guy knows his ****. These turbos spool like no other and build awesome boost.

-Chris

 

if you can find HT-12s (FD turbos) that aren't put together on one manifold, they'd work good. otherwise, like chris said, smaller mitsu turbos, volvo or saab turbos. Anything below a T3 on the garret scale ought to be good. 16gs or 13gs...stock anything twins will work, as they were chosed for a twin setup to begin with.

 

well i was talking about the 16g Killers or whatever, they are made (remade) by turbonetics or some company i dont know which?

-Chris

 

A GTS-t makes 215hp @ 10psi, so with two you have the capacity for an easy 430hp at the same boost. I presume since you're going to all the effort of twin turbos and aftermarket management that you're shooting for serious power without the lag of a big single. That's why I suggested those turbos, but there's nothing wrong with something smaller. Using the stock power and boost of the donor engine is a good guide to selecting OEM turbos.
Complicated? All you need is a a normal engine flange and two pipes that go to two seperate turbo flanges. That's no more complicated than a single turbo manifold really. Positioning the two turbos is probably the most challenging part.
Hmm, they make 276hp @ stock boost (dunno what that is), and a mate made ~420hp at what turned out to be a turbo-killing 13.5psi. Maybe a safe 350hp at a guess.

 

They're designed to work bolted together as a package. One hasn't even got a wastegate, which is common in factory twin-turbo set-ups. Plus...
Any factory twin-turbos will only have limited scope for more power, because like any turbo they were only designed to make stock power. Once you screw about 30% more than stock out of them you affect their reliability, plus they're past their efficiency peak. Using two turbos off a single-turbo engine gives you much more scope.

 

Hummm..... Here in the states the TT 300zx runs 300hp at 9.5 psi stock. My Girlfriends TT zx dosent seem to mind running 17 psi on the stock turbos. Quite some lag being the turbos arn't sequential, but makes some insane power at about 4k.

 

plus actuators and a valve to cut exaust to one turbo at low rpm, aswell as some sort of prespool system so that you actually have some turbo life.

 

Ah, see in Japan they're not allowed to say 300hp, but yeah that's probably what they're making. Trust me, those turbos won't last long on 17psi. They're massively oversped at that boost. They shouldn't be lagging either. My mate's was boosting hard well before 4000rpm (more like 3000rpm), but he did have a 3" exhaust off each turbo and a pair of S5 intercoolers.
Dude, who said anything about sequential turbos? We're talking about plain old parallel turbos that are no more complex or hard to understand than a single turbo. Do you find twin exhausts complicated? Same principle. It seems anybody who knows about FD's gets all nervous when you mention more than one turbo on one engine, but sequential operation is a completely different issue.

 

Try using 2 Garrett GT28 ballbearing turbos. T28 came on the Nissan S15 Silvia. Would spool quickly but might have issue with flow as they are .64 AR. The T28 that came on the Pulsar have .86 AR and inconel turbine but not BB but may be better option for our rotaries. Have fun.

 

Well She does have a HUGE front mount and the stock cats currently on it, so that probably causes the large amount of lags. It starts hitting boost about 3k and hits full at about 4k. I figured the 17 psi wasent the best idea so I had sense turned it down to 12.

 

I kinda want to do this: http://www.dysonrotary.com.au/ASP/te...item=ADAS4Twin

 

The idea was, i don't want BIG power. that just costs too much to maintain with things breaking etc, and death is always imminent with huge rwkw's under foot...

I am happy with the power a S5 Hybrid turbo (T04 compressor wheel, or whatever it is they do) but having the boost come in at 5000rpm until 8000rpm (or similar) is just ridiculous. You're hurtling along at the speed of light doing that, it just isn't practical for daily driving.

I wanted a way to bring the boost down to an accessible RPM. (like the FD, even though that is inaccessibly sequential)
I can't spend heaps on an expensive roller bearing turbo/external gate....so a OEM turbo appeals. inbuilt wastegate makes it even cheaper and simpler to use.

so small parallel twins it is!

a 2000rpm - 5000rpm (or similar) boost range would be fun, and not so powerful (i assume) that it'd break my diff and gearbox every two f**king seconds given the small turbos i'd be using....
i loved the "thrown back in the seat" feel of the sequential FD twins, and would like to emulate it in as realistic a way possible with a parallel setup (sequential setup a vacuum hose nightmare, etc, from my experiences)

just remains to establish which stock turbo....GTiR T28's, or the S15 T28's sound good.

That Dyson Rotary twin S4 manifold is overpriced IMO, and two S4 turbos would be a bit laggy wouldn't they? given they would be only receiving half the exhaust gas that they normally would.

I was thinking;
steam-pipe manifold custom made: AU$200-$300
pair of small, stock turbos: (yet to be decided) AU$300 the pair from Wreckers?
modified piping from turbos to IC: (make & weld myself)
exhaust modification: AU$Not Sure
EMS to run it: AU$500+ (2nd Hand HaltechE6K or MicrotechMTX8)

So hopefully I could get away with the whole project for approximately AU$1000....I just have no idea what turbos, from among the seething morass of cars out there, fit the bill best.

 

I like that Dyson manifold, but the price is ridiclous...

I like the way you're thinking. I'm trying to think of smaller older turbo cars that would suit your needs. Maybe Pulsar ET (Garrett T02) or Cordia Turbo (leaded TC06, unleaded TC05). Cars like that.

 

And it's going on a Convertible too
http://www.members.optusnet.com.au/~tiwaz/VertSide.jpg
I'm not too thrilled with the daily driveability and overall tuneability of Microtech's ECU's....but given this is a long term project, i can afford to wait so I can swoop on parts cheap when the bargains present themselves.
Haltech seems common enough for a bargain to pop up sooner or later, there are knowledgeable tuners (ala Hitman) and it is a highly refined unit (unlike Microtech)
but anyway...
How may HP does a GTiR Pulsar T28 flow?
Any more turbo suggestions more than welcome!
cheap & appropriate is the name of the game!

Perry Gehenna

 

two turbos from a 2g mistu eclipse... a penny can stuck in the inlet!