I just bought a pair of TD04's from a Z32 300ZX. My idea is to make a divorced twin setup...the turbos were cheap, so I'm not out much and I'll get some entertainment from it.

Basically the "divorced" idea should be pretty self explanatory. Each turbo will be fed independantly...one on the front rotar, one on the rear rotar. Since, at the moment I don't think it'll matter after 36" of tubing, the exhaust will merge in the general area of the stock cats, and the intakes will merge just before hte AFM. Oiling and cooling is other wise just the same as stock...I'll just have to put a T-fitting in the lines and run a little extra tubing.

Basically it's a "for kicks" idea. Anyone have any opinions?

 

i think this was discussed, and a problem had was that most car's stock turbos arent big enough. that and running a really good single beat out twins i think. but i say go for it....pics asap :-)

 

The reason most other turbos ended up too small is the turbine isn't capable of handling the 13b's exhaust...over-spins the assembly or something. These have fairly large turbine housings, but I'm not too sure of the specs. I think using both will be fine...if nothing else i can sell them for what I bought them for.

In big power applications, I can see a single winning out...but that's never my goal. I wish I would have been able to find a pair of CT12A's for about the same price...they'd be more oriented toward my goal, they spool up like nothing else.

 

yeah man, i still say go for it. i dont think ive ever seen or heard of a twin t 6 port. just people running mouths about it. i back this project %110

 

I don't think it'll matter if it's a 6-port or not. I'm going to be designing it around an otherwise stock S4 TII assembly (but it is a 6-port N/A block).

Cool thing is I'm going to try and get it to fit around the N/A intake WITHOUT clearance issues with the body......and I don't think a simpler manifold would be possible. These things are almost going to be bolted to the block.

 

It depends on the turbos, are they TD04H-13G's? I can't find **** for which turbo it is.

 

Not sure of the exact model number...M24's according to Nissan...kinda curious now. The guy says they're TD04's, but that's what the 3000GT and Eclipse ran. I think they're basically the same, though...T-25 or T-28...

 

Ouch, chances are the compressor is too small to be any use for you, they generally run out of steam pretty damn quickly. If you do manage to use them, don't plan on going much over 8psi lol.

 

not looking for a big boost application...just one that'll spool really fast. One thing I like about these, though, is that they're easilly upgraded...thats the only good thing the 3cz crowd has to say for them. I think they'll be fine in a dual configuration but I dunno...can you blow up a turbo? That's the only acceptable alternative to failure.

 

Not before they'll blow up your engine, usually.

Most of those turbo's just don't flow enough, they'll sit in like the 70% efficiency range at most the boost levels, MAYBE travelling through peak for like 500rpm before coming out of it again, and then the rotary flows so much air that they either can't keep up, or their efficiency is so low you can't run them at much of anything. You'd be better off with a stocker in my opinion.

 

I have a car with a stocker.

 

I want to get two small turbos that will spool faster than the stocker and maybe be a small upgrade. What would you suggest?

What number tells you how big the turbine is?

 

Haha all those numbers just go right over my head, but it sounds interesting. I'd like to see it!

 

TD05-14G's compressors would be ok @ 10-15psi, they have IIRC a .41 A/R turbine, I'm not sure how well that'd work with a single rotor, but I'd assume that since single turbo's use larger than double that, it'd work fairly well? I'm not too good with twins.

 

Then what'd be wrong with two turbines with a .48 a/r? I was under the impression that the turbine side was the typical problem...

 

Most people don't try to dual them up though, lol. I really don't know, you'd think just splitting it up would allow you to chose well, but there might be more to it, as I said, i'm not good with twins!

 

We're trying GT2871R's.
Three on our 20B and two on my 13BT.

You're right about the too-small turbine housing.

GT2871
0.86 turbine A/R
internal WG

Those Z32 turbos are notorious for puking oil.
Hope you got a good set.

BTW, other RX-7 owners have already tried twin...
T3 / T4 hybrids
GT28's
T3's
You can check out the threads in the "Single" turbo section.


-Ted

 

The turbos are from a friend...he had his engine and turbos both rebuilt then decided he'd drop a semi on the *** end of things. They're fairly fresh...

So do you think these are too small to really be worth much effort?

 

You really need that large of a turbine for a single rotor? That's the last damn turbo mystery I need to figure out, turbine sizing...

 

I think the TD04's are too small.
I would be surprised if one makes 200hp on a 13BT, so you're looking at a 300hp ceiling, if you do get them to work.

The small hot side scares me.


-Ted

 

I like to run them big.
To me a 1.32 divided T4 isn't too big.
When I ran all the numbers, the 0.86 should be okay.
I'm prepared for a little bit of lag, but hopefully the isolate exhaust pulse + BB centers should help.
I'm hopping it'll hit full boost somewhere in the 4,X000RPM range?


-Ted

 

Heres a freindss TT setup , ( NA - 6 port block )

 

Random, forgot to explain, He did something like you want to do.

Honestly , it was lots of work. And well I dont think it was really worth .

But if your doing it for kicks , AWESOME !

pics when your done

 

I hear you on that, though since he says spool is his #1 worry, that's when I kind of became curious if they'd even work of if they'd just choke out at the top of the band.

.41 is awful small!

 

The goal with this project is 250rwhp, tops...power isn't the main concern. What I'm looking for is a really fast spool and a wider powerband. My thinking is that the smaller turbines might catch at a lower rpm. I really don't see any reason to push more than 10~12lbs with what I'm looking for. These turbos aren't too effective at anything about 1 bar anyway.

I'll probably go ahead and start with these and if I further the project later I'll look into a larger turbine.