Im not sure if this has been brought up, im sure it has been but anyways.(bash away for not searching)

Hasy any one attempted running a Twin Charge set up...........Like Stillen S/C and TN single........or any of the TT kits and a Stillen?


Are there any true benefits to a twin cahrged setup?


Just came to my mind after seeing a Twin Charged 4a-ge......

 

the stillen blower will stifle any other forced induction as it simply cannot flow enough. Besides, it's not really necessary on this car......

 

First off there is not enough room. We will leave it at that.

 

OverZelous1 has attempted with a Vortech blower.

 

overZealous1 was playing with something like that. I'm not sure if anything ever came of it though.

Edit: Gah, too slow.

 

The most realistic and most successful of twin charging, would be the use of two different sized turbos.

Superchargers provide steady boost from 0 rpm and up because it's driven directly from the crank. But, they take 20-30% of the power they make to run themselves. And we're all familiar with turbo lag.

The idea of twin charging came from the need to eliminate turbo lag by having a supercharger for low down in the RPM range and having a nice big turbo take over for the high end.

This set up is VERY tricky to install and even trickier to tune. And for most applications, really not necessary.

The most successful set up like this, using two different sized turbo's, was used on the Factory Turbo setup on the Mark IV Supra. A small turbo, giving boost low down, then giving way to a bigger turbo for higher up. Turbo lag was almost totally eliminated, but keep in mind, the straight six had more than enough torque to get started on it's own.

With our cars (350Z) in particular, a set of twin turbo's, both the same size, and appriately sized for your horsepower requirements, should satisfy 99% of us.

In the end, it all comes down to personal preference anyway, and how insane we want to make our setups. If not by necessity, we only do it because we can!!

 

so really a twin charge system is just a sequetial set up...more or less depending on what you are running.

okay thanks for the help..........

 

no, a twin charging system isn't a sequential setup.....a sequential setup is a sequential setup, and a twin charger is using 2 different forms of FI

 

too poor to do that

 

Well the way beast was talking it soundly like he was saying a sequetial set up is another form of Twin Charging. But now that i re read it maybe he was refering to the best way to reduce turbo lag..........my fualt on hte mis reading and thanks for hte correction

 

Colossal waste of time in my opinion. Size your twins correctly and you're good to go with a lot less effort.

 

I scanned this in for the twin charging wtb crowd.

https://my350z.com/forum/forced-induction/223546-tokyo-auto-salon-06-hks-st-tt-sc-water-air-intercooler-twin-charged-700ps-tt.html

 

I saw a twin charged STi on the STi forums once. It had a turbo and a supercharger, put out bout 600awhp but got 2mpg at WOT. No lag :-D

 

Twin charging is very common in the mini cooper world. They come stock with a roots style blower and add a turbo to make 300whp out of a 1.6 sohc. What I have read is that they lower the boost that the stock supercharger makes by alot (change the pulley) when they twin charge. So it seems to be a waste.

 

Lowering the boost on the supercharger is necessary for twin charging and no its not a waste in that application. The supercharger still provides compressed air immediately off the line and helps create more exhaust gas which spools up the turbo compressor faster. The problem is that if the turbo is discharging the compressed air into the supercharger and the supercharger is compressing it again then the boost is compounded. So if the turbo is creating 5 PSI of positive pressure in the charge pipe and that is run through a supercharger which is itself compressing it 5 PSI you get 25 PSI off boost at the manifold. You can see how this can be dangerous. On the Z I just don't see this being necessary. With as much displacement and off boost tq as the Z has theres just no need to do this.

 

25 PSI...? Is that right? It's not 10 PSI?

 

No not if the supercharger is still compressing air. Compressed air doesnt add when its compressed again. It compounds. Link from Wiki: http://en.wikipedia.org/wiki/Twin-turbo

 

Are sure you Mia? I did the math before, on Overzealous1' thread. Forgot the figures though. Not much help is it?

 

I don't mean to argue, I just need to understand...

If the turbo impeller alone adds 5 PSI to the air charge, and then the supercharger itself boosts that charge by another 5 PSI, then the total boost pressure inside the intake manifold would be 10 PSI, wouldn't it? How would the 5 PSI sc multiply the 5 PSI of turbo boost by a factor of 5?

 

Did either of you read the Wiki link I posted. The system does not "add" boost to the car. A turbo or supercharger compress air at a given pressure ratio. If a turbocharger is running and compressing ambient air at a 3:1 pressure ratio the air leaving the outlet of the compressor is running 3:1 pressure. Now if that compressed air is then fed into another compressor, in this case a supercharger, tat is also compressing incoming air at a 3:1 pressure ration than the resultant pressure ratio is 9:1. If you google tractor pull setups this is a quite common configuration. There are some diesel tractors that run upwards of 350PSI. They do this by running the outlet of a smaller (T57 or smaller) compressor into a larger T72 and then into a larger T88, and sometimes into a larger T102. The fact remains. When the outlet of compressor a is fed into the inlet of compressor b the net result is a compunded pressure ratio.