turbo question
good ? i wana know this also 
Registered User
Joined: Mar 2003
Posts: 10
From: New Albany, IN
Are you talking about having 2 turbos that run off of 3 cylinders each and then feed a single throttle body that feeds all 6 cylinders? If that is your question, then the answer is yes. That is how the RB26DETT engine in the Skyline GTR works, not to mention the VG30ET in the Z31 300ZX Turbo, and the motor in the Mitsubishi 3000GT VR4 (I think, but that motor might be a sequential instead of a parallel turbo setup).
Z Extreme Guy
Joined: Oct 2003
Posts: 673
From: reno nv
Originally Posted by boileralum
Are you talking about having 2 turbos that run off of 3 cylinders each and then feed a single throttle body that feeds all 6 cylinders? If that is your question, then the answer is yes. That is how the RB26DETT engine in the Skyline GTR works, not to mention the VG30ET in the Z31 300ZX Turbo, and the motor in the Mitsubishi 3000GT VR4 (I think, but that motor might be a sequential instead of a parallel turbo setup).
The Evil Twin
Joined: Mar 2001
Posts: 9,297
From: Seattle, WA
So then your backpressure varies on the three that push through a turbo housing and the three that go straight out the exhaust.
Yes, it is possible, but I don't see the point. It would just take longer for the turbo to spool up... a lot longer. When you create the boost, half the extra exhaust gasses are not helping to push the turbo harder for more intake boost. What a waste.
Yes, it is possible, but I don't see the point. It would just take longer for the turbo to spool up... a lot longer. When you create the boost, half the extra exhaust gasses are not helping to push the turbo harder for more intake boost. What a waste.
Thread Starter
Registered User
Joined: Aug 2002
Posts: 150
From: Maryville, TN
Yea but you could get the turbo closer to the front of the engine, therefore less piping. For the back pressure you could just put a smaller exhaust on the other three. I was just wondering cause I got board one day and the mind started to wander, you know.
Guest
Posts: n/a
You'll only be using half the exhaust energy to drive the turbine wheel. This would be like installing a wastegate that's always stuck open.
A little turbo theory - the hot exhaust gas leaving the cylinder turns the turbine wheel which forces more intake air into the engine via the compressor wheel. After combustion, this higher volume of air becomes a higher volume of exhaust which then adds more energy to drive the turbo.
So even if you had a turbo sized for just 3 cylinders, the turbo is still going to be counting on all the air it's pushing into the engine to help drive itself on the exhaust side. With half the exhaust energy being wasted, the turbo will never respond right.
A little turbo theory - the hot exhaust gas leaving the cylinder turns the turbine wheel which forces more intake air into the engine via the compressor wheel. After combustion, this higher volume of air becomes a higher volume of exhaust which then adds more energy to drive the turbo.
So even if you had a turbo sized for just 3 cylinders, the turbo is still going to be counting on all the air it's pushing into the engine to help drive itself on the exhaust side. With half the exhaust energy being wasted, the turbo will never respond right.
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