Twin turbo? [Merged 11-6]

[OneSexyDSM]

why would you, you would gain very minimal power, if any.

 

[MNGSX]

I don't think it would spool twin T-25's too well.

In paralell it splits two cylinders per turbo. The spool point for each would be double a single T-25. So it would lag worse than a 20g.

A sequential system if designed properly would work but you would need say a T-25 AND a 20g or something. It spools one turbo at a time with the full force off all turbos. The remaining exhast velocity that went thru the first turbine hits the second.

It would be best done with a manifold mounted wastegate.

Simply put the only way two turbos would work would be more expensive than one good one.

Also the cheap way to used two (parallel) would blow because it would spool like ass and get spanked by a small or big 16g quite easily.

 

[TazManianDevil]

ok tnx guys i have one more question...

can i put the engine of 3000GT VR-4??? have your guys tried it??? or a friend of yours??? i know i sounds crazy its my 1st car

 

[andol469]

Originally posted by TazManianDevil
ok tnx guys i have one more question...

can i put the engine of 3000GT VR-4??? have your guys tried it??? or a friend of yours??? i know i sounds crazy its my 1st car

Check out the search, these two topics have to beaten to death.

I'm sure you could put a 6g72tt into a DSM with enough cash, but there's no justification for dropping that kind of dime on a project like that. Chances are the 4g63 is capable of making more power than you'll ever be making.

Bottomline: No real power benefit to twin-turboing a DSM (or anything for that matter) and the 6g72tt swap would probably be more trouble than it's worth.

 

[Satori]

Originally posted by Colossus
You generally need 2 intakes dont you? One per turbo? Or a double holed exhaust, and double intake? 1 for each turbo. There would be room I'd imagine. The GS Turbo kits mount the GS above the manifold, and the GS-T / GSX turbos are kinda down below. One on top of the other makes sense to me.......But in the end, wouldnt it be to much PSI unless your running low boost levels on both?

Nope, one intake and one exhaust. The smaller turbo would simply get bypassed through its wastegate after it reaches full boost and feed the second larger turbo.

The mechanics of sequential twin turbo is relatively simple. Setting one up is not because you'd have to go through lots of turbos to find the right combination to work reasonably seamlessly with each other. Also, in our cars you'll need a lot of luck trying to fit all that under the hood without cooking anything.

It’s not a bad idea at all, but it isn’t worth the time money and effort for our engines.

 

[Brunt]

I have heard of people going twin turbo, 1 small for fast spool then 1 for high end. Does this work? If the small turbo cant keep up at the high end, and the big turbo is making boost @ the smaller turbo, wont that damage it? Just curious if this actually works...?

 

[LandoAWD]

There have been quite a few threads on the subject. Personally, I don't mind waiting till a little after 3k for full boost.

 

[psychlow]

I have heard of people going twin turbo, 1 small for fast spool then 1 for high end. Does this work?

Yes, and it works quite well if set-up correctly.

If the small turbo cant keep up at the high end, and the big turbo is making boost @ the smaller turbo, wont that damage it?

I don't quite understand what you mean about the "big turbo is making boost @ the smaller turbo." But on a parallel-twin setup, the smaller turbo has a wastegate that vents the exhaust gasses when the exhaust reaches a certain pressure so that the smaller turbo isn't overspun. By then, the larger turbo has hit boost and taken over.

The problem with doing twin setups on DSM's is that, one, it's horribly expensive (ie, custom.) Two, there isn't a whole lot of room to plumb one turbo and a FMIC, let alone two turbos.

You'd also gain some street drivability (low-end), but also sacrifice some gas mileage.

 

[13secGST]

Like the guy just said...its very possible and has been done before, and would be very nice for streetablitly, but, honestly...for the amount of money it costs you might as well:

Get new forged pistons, and rods, get a big 60-1 trim T3/T4, and then throw on a 100 shot of direct port nitrous...and you have a (less reliable) fast spooling torque monster.

 

[Demonix]

It's called Sequential Twin Turbo, its hard to do, hard to maintain, and extremely hard to tune. It also costs an assload of money. The only sequential turbo I've seen in person was on a RX7

 

[ivanr4g63]

Yeah, also, I believe you can find some more info from experienced tuners on the supra forums, I believe that the 2JZ is very known to be very common for this setups, and yes they are talking lots of dollars, and a full Engine Management System for adequate tunning.

 

[CKJ_TSi]

Clear up a few things I read....

There are NO aftermarket sequential setups. The cost of R&D on that kind of thing is WAY too high. The stock turbos on a Supra, RX7, and Skyline (those are the only 3 stock sequential cars I can think of).. and the first and second turbos are the same size in each of those cars. The first turbo spools first to a set boost level, then the second one comes in and adds more boost on top of the first.

The aftermarket twin setups that some run on Supras are parallel spooling, and Ive never seen them using different sized turbos.. Ive only seen them with same size turbos.. By parallel spool, I mean they dont spool one first, then the other like the stock turbos do, they spool both together, which is usually just as laggy as a big single, and doesnt usually produce any more power. I know in the Supra crowd its said that if you want more performance go single turbo, if you want show points or just to be like "lookie what i have" go aftermarket twin. On my Supra, I went with a single turbo setup. It was cheaper, faster spool, with the same or more power produced.

 

[DSMSpyder99]

like everyone else said it is not worth it just think about why all the japanesse supercars go to one turbo setup for some real horsepower.

 

[Brunt]

Well, alright, but 1 question I had was...if the first one was set to say 13 psi, and the larger one came and added more boost then that on the intake side, wouldn't that create back pressure on the compresser wheel now that it has a 2nd force pushing on it with greater psi? Its all on the same intake unless the smaller turbo has some kind of 1 way only valve so the bigger turbo cant create any psi back to the smaller turbo.

 

[GoSpeedRacerGo]

I really doubt that more than 1 turbo on a 2.0l motor would even have enough exhaust gas to increase the spool, or even make it worth while.

 

[Brunt]

I am not talking 2.0L I am talking in general. Wouldn't the big turbo start forcing air back into the smaller turbo..since its bigger and creating more PSI then the smaller one.

 

[CKJ_TSi]

well the thing is there are no setups that use a small turbo and a big turbo.. factory twin turbo setups and aftermarket twin turbo setups both use equal size turbos.. there are ways to make it where when the second turbo spools it doesnt harm the first one, but the research and development involved in making it work is what is so expensive.. and which is why you only see sequential setups on factory turbo setups, and not on upgraded turbos. Also the way to make the turbos spool one first followed by the other (sequentially) requires a lot of R&D, which the aftermarket companies have no reason to spend the money on it like the major automakers do. There are cheaper ways to make more power.

 

[Brunt]

ahh alright, so its not just as simple as having a 1-way valve on the smaller turbo, so the bigger one cant push air back into the smaller one...there is a lot of work into developing a setup like that. Thats all I was asking..not so much power or whatever..just how it would work, and not damage the smaller turbo

 

[Defiant]

What about variable vane turbos?

 

[Brunt]

What are those?!?

 

[fosh0ma03]

IMO a t/t setup in a dsm is pretty cool as far as being unique goes. The cost of it though is just way too much. The only way I would ever go about this is if I was some rich guy who had way too much money to spend. Yes, its possible, just not worth it. You could use the money you saved to buy way more parts for your single turbo dsm.

Oh and now that I think about it, if I was some rich guy with way too much money to spend, I would proabably have a porche 911 turbo, not a t/t dsm.

 

[Blaze T.]

Does anyone know if it is possible to make the 4g63 a twin turbo?
If so how would I go about it?

 

[Jon H]

Doug Derby of Doug's Dyno Power did it with a 1g, so it's definetely possible.

If you want to know how to do it, call up his shop.

But IMO, that idea = t3h gh3y

 

[nineD5_GS-T]

This topic has been covered many times over. Use the search button.

Yes, its been done. No, it wasn't that fast.

It used 2 t25's since thats all they could cram in the engine bay and spool in a respectable amount of time.

There used to be a guy on the trader selling manifold/ header designes for a twin turbo setup.

Why do that when you can have a 500hp single turbo????

 

[leet]

A twin turbo setup on our cars, is pointless. It is much cheaper (and proven) to run a single turbo.

And yes, there are a MILLION threads about this.