[soulja620]

I'm sorry if this is a silly question, but in my brief time here I don't believe ive heard anything on this topic.. I've had/worked on nothing but single turbo cars so I'm unsure how ours work..

Soo,
From my understanding, some Twin Turbo engines function specific ways.. And not all work the same...

I was told (not sure if it's true) bpu supras work in a way that 1 turbo is used for low end torque/rpms and the other primarily for higher rpms...
Meaning the don't work simultaneously with eachother but only used dependent on engine load/rpm...

For our motors, do our turbos cooperate in this kind matter, or do they work in a combined sense that target boost is "split" between each turbo..?
For example if target boost is 12psi, does each turbo manage 6psi to get a combined 12psi?
Or are they managed in a totally different sense?

Thanks,

[marv85]

Originally Posted by soulja620

I'm sorry if this is a silly question, but in my brief time here I don't believe ive heard anything on this topic.. I've had/worked on nothing but single turbo cars so I'm unsure how ours work..

Soo,
From my understanding, some Twin Turbo engines function specific ways.. And not all work the same...

I was told (not sure if it's true) bpu supras work in a way that 1 turbo is used for low end torque/rpms and the other primarily for higher rpms...
Meaning the don't work simultaneously with eachother but only used dependent on engine load/rpm...

For our motors, do our turbos cooperate in this kind matter, or do they work in a combined sense that target boost is "split" between each turbo..?
For example if target boost is 12psi, does each turbo manage 6psi to get a combined 12psi?
Or are they managed in a totally different sense?

Thanks,

I'm by no means an expert. But I don't think that's the way our turbos work (plus they feed different cylinders so for sure we dont have one for low end and another for high end ).

I think both our turbos have the same target boost, just double the volume...

[kenneth]

They each work with 3 cylinders!

[PeteW84]

Originally Posted by soulja620

I'm sorry if this is a silly question, but in my brief time here I don't believe ive heard anything on this topic.. I've had/worked on nothing but single turbo cars so I'm unsure how ours work..

Soo,
From my understanding, some Twin Turbo engines function specific ways.. And not all work the same...

I was told (not sure if it's true) bpu supras work in a way that 1 turbo is used for low end torque/rpms and the other primarily for higher rpms...
Meaning the don't work simultaneously with eachother but only used dependent on engine load/rpm...

For our motors, do our turbos cooperate in this kind matter, or do they work in a combined sense that target boost is "split" between each turbo..?
For example if target boost is 12psi, does each turbo manage 6psi to get a combined 12psi?
Or are they managed in a totally different sense?

Thanks,

The N54 is a parallel twin-turbo engine, not sequential turbo like the Supras. Both turbos function simultaneously, and are driven by 3 cylinders each. As far as the boost goes, both turbos make the same amount of boost. Here's a good article about it, check it out:http://en.wikipedia.org/wiki/Twin-turbo

[NiVeDh]

Pressure and volume are different. marv85 is correct.

[soulja620]

Awesome, thanks for the replies!!

But I'm still a bit confused..
So each turbo forces the full Target boost (example 12psi), but double
The volume?
& each turbo is driven by 3 cylinders via exh-side hence the dual 3port turbo manifolds.. Got that...

Maybe it's late and my brain isn't working but how does 2 turbos exerting the same full boost levels (lets say 12pounds) manage that's same 12pounds when it reaches the intake manifold?
Sry for the confusion

[mazdaspeed6]

If you run 15 pounds of boost each turbo puts out 15 psi and the cfm from both turbos is stacked... It's NOT 7.5 psi from both turbos to make 15 psi...

[mazdaspeed6]

Look at it this way,if you have two air tanks both having 20 pounds of pressure with a valve in between them. Once you open that valve to connect both tanks you will still have 20 psi total but have doubled your volume

[WilliamE92]

Originally Posted by mazdaspeed6

Look at it this way,if you have two air tanks both having 20 pounds of pressure with a valve in between them. Once you open that valve to connect both tanks you will still have 20 psi total but have doubled your volume

wat

[deadlyrhythm]

Originally Posted by WilliamE92

wat

Really? No offense, but this is high school math.

[deadlyrhythm]

20 PSI + 20 PSI merely equalize - REGARDLESS the volumes present in each air tank

[soulja620]

Gotcha thx

[marv85]

Originally Posted by soulja620

Awesome, thanks for the replies!!

But I'm still a bit confused..
So each turbo forces the full Target boost (example 12psi), but double
The volume?
& each turbo is driven by 3 cylinders via exh-side hence the dual 3port turbo manifolds.. Got that...

Maybe it's late and my brain isn't working but how does 2 turbos exerting the same full boost levels (lets say 12pounds) manage that's same 12pounds when it reaches the intake manifold?
Sry for the confusion

An analogy would be two parallel 1V voltage sources feeding 2A each to the same current sink. The voltage is still 1V at the output but the current is is 4A.
So our turbos are pushing for the same boost in a parallel meaning they will push a total volume which is the double of the volume of one. At the same boost.
I hope I didn't create more confusion with this

[soulja620]

Originally Posted by marv85

An analogy would be two 1V voltage sources feeding 2A each to the same current sink. The voltage is still 1V at the output but the current is is 4A.
So our turbos are pushing for the same boost in a parallel meaning they will push a total volume which is the double of the volume of one. At the same boost.
I hope I didn't create more confusion with this

Negative not at all that makes it much easier!
Thanks

[marv85]

Originally Posted by soulja620

Negative not at all that makes it much easier!
Thanks

you're welcome

[Joshboody]

turbos are just pushing air. the amount of air creates pressure in the intake piping. The MAP reading is the total pressure and the DME calculates set points based on this info (along with temp and rpm).

Each turbo gets the same wastegate control signal.

[stealth-twntrbo]

Each turbo spins approx the same to create the boost pressure. you have 12 psi in your intake pipe going in to one manifold supplying all 6 cylinders. Each turbo runs 3 cylinders but all the air is forced into one manifold split between all 6 cylinders. So its not like the turbo 1 feeds cylinders 1 3 5 etc. If its 12 psi total pressure each turbo is probably putting out about 6 pounds each. APPROX

[biz77]

Originally Posted by stealth-twntrbo

Each turbo spins approx the same to create the boost pressure. you have 12 psi in your intake pipe going in to one manifold supplying all 6 cylinders. Each turbo runs 3 cylinders but all the air is forced into one manifold split between all 6 cylinders. So its not like the turbo 1 feeds cylinders 1 3 5 etc. If its 12 psi total pressure each turbo is probably putting out about 6 pounds each. APPROX

No! If each turbo is producing 6psig at the outlet, then negating piping and intercooler losses, the manifold pressure will be 6 psi, not 12.

[mycoupe]

They Do Not Put Out 6 Psi Each!!!! Its 12 Each If The Target Is 12!!!!

[NoQuarter]

If you see that 12PSI is measured in the box, at which point does it stop measuring 12PSI? As you get closer to the inlet? Right outside or right inside the inlet the pressure measures the same or does it suddenly drop off to 6PSI?

[love2drive]

Having two turbos allows each to be lighter, hence faster spoolup.

BTW, I keep seeing your sig, Soulja, and have to ask what kind of performance you were able to get out of your Starion.... HP, qtr mile?

[biz77]

Originally Posted by NoQuarter

If you see that 12PSI is measured in the box, at which point does it stop measuring 12PSI? As you get closer to the inlet? Right outside or right inside the inlet the pressure measures the same or does it suddenly drop off to 6PSI?

Attachment 495492

If the pressure inside the box is 12psi, then there is 12psi throughout the entire system and all the way down both the "pipes" you've drawn back to your pressure sources. In a parallel turbo set up you are not compounding the pressure. It is the same. If each turbo is producing 12psi of boost, then the manifold pressure will be 12psi. If each turbo is producing 6psi of boost, then the manifold pressure will be 6psi. Again this is negating any pressure loss from the piping and intercooler.