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[GTiGuy]

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[ianacole]

Interesting.  I've often wondered if running two smaller turbos would be better than the one k03.  I wonder how much heat is produced out of a setup like that.

[Southcross]

Interesting.  I've often wondered if running two smaller turbos would be better than the one k03.  I wonder how much heat is produced out of a setup like that.

haha... already had a design for a 4 Cyl, two stage turbo design... tiny turbo for super fast spool (T2)... its MASSIVE waste gate and exhaust turbine fed directly into a HUGE turbo (T4 or T6)... the tiny turbo could generate the initial boost then once the system was spooled (say 8-16psi) the boost is being generated by the T4/T6 (3-4BAR) :twisted:

Edit... I need to find the dual stage turbo design image that BMW designed

[Barry]

I am pretty sure that is a picture of 4 turbos, each coming off of the individual exhaust valves. Interesting design, but as Ian said, how much heat would that generate? I'd like to see a working model of that one E...

Also, what kind of boost would those generate?

[ianacole]

haha... already had a design for a 4 Cyl, two stage turbo design... tiny turbo for super fast spool (T2)... its MASSIVE waste gate and exhaust turbine fed directly into a HUGE turbo (T4 or T6)... the tiny turbo could generate the initial boost then once the system was spooled (say 8-16psi) the boost is being generated by the T4/T6 (3-4BAR) :twisted:

I was actually thinking along the lines of having one turbo feed cylinders 1 and 4 and another feeding 2 and 3.

[Southcross]

haha... already had a design for a 4 Cyl, two stage turbo design... tiny turbo for super fast spool (T2)... its MASSIVE waste gate and exhaust turbine fed directly into a HUGE turbo (T4 or T6)... the tiny turbo could generate the initial boost then once the system was spooled (say 8-16psi) the boost is being generated by the T4/T6 (3-4BAR) :twisted:

I was actually thinking along the lines of having one turbo feed cylinders 1 and 4 and another feeding 2 and 3.

problem is... if one bank of cylinders gets just a small ammount of fuel and air different... the off-balance of power could cause some serious issues at high RPMs

[Scott]

I cannot see that being terribly efficient. How do you keep the turbos spinning at a constant rate with exhaust pulsing into them like that? One turbo for 2 cylinders is a bit more plausible as I see it, but it all depends on what you are trying to accomplish as well. I can see why Ian would want it because in his type of racing, turbo lag is bad.

[The Asshole]

looks cool let see the rest of the car and its numbers'

[ianacole]

problem is... if one bank of cylinders gets just a small ammount of fuel and air different... the off-balance of power could cause some serious issues at high RPMs

Hmmmm...that's a good point.  I wonder though, as I spool up, running through, say, say second gear, the air pressure and fuel rates are constantly changing even with a single turbo.  I would think that at no point in the acceleration sequence is a cylinder get the same mixture as the previous in the firing order.

The old dual and triple weber setup on datsuns and whatnot - did they feed different cylinders or feed one single intake runner?

[The Asshole]

The old dual and triple weber setup on datsuns and whatnot - did they feed different cylinders or feed one single intake runner?

the carbs would feed a certain number of cylinders via different intake manifold planes (runners are termed for fuel injected cars)

e.g. the moper 440 6pack had a dual plane intake manifold, with 3 2 barrel carbs. one carb fed the left and right cylander banks, but with this setup
under normal driving conditions, the 3rd carb sat idle and did nothing, but
under high throttle heavy load acceleration, the third carb would kick in feeding additional fuel into each bank of cylinders.

old offenhauser intake manifolds for old chevy straight-6 engines actually used 2 separate intake manifolds each with a 2 barrel carb on a dual plane manifold.

[Rukh]

Go Jimmy!

The general consensus on TCL for that quad-turbo setup is that it isn't very efficient. They seem to think that individual cylinder exhaust pulses would be prohibitive to the turbos spooling efficiently. Also, the TCL experts said that a a single turbo, or dual series turbos should be installed at a ratio of not more than 1 per four cylinders, since one cylinder would always be expelling exhaust in a four-stroke engine.

I think that the engine above looks like it has a 4-into-1-into-4 exhaust manifold, which would equalize the pulses between all four turbos, but others don't see it.

[motel6]

I think that the engine above looks like it has a 4-into-1-into-4 exhaust manifold, which would equalize the pulses between all four turbos, but others don't see it.

I thought this thread was going to be a lot of unexperienced babbling, but Scott, Jimmy, and Josh got it right.

There's a 4 into 1 log  manifold that equally feeds all the turbos. Efficient? Who knows without knowing what type of engine it is, that its intended use is, and what the specs are on the turbo.

[Nickle]

That's not the first time I've seen that tried.  My biggest fear would be the period between exhaust pulses would be too long, even at high RPM's, like previously stated.  Cool concept, but I don't think it'll work as well as it is hoped.

[Scott]

I think that the engine above looks like it has a 4-into-1-into-4 exhaust manifold, which would equalize the pulses between all four turbos, but others don't see it.

I thought this thread was going to be a lot of unexperienced babbling, but Scott, Jimmy, and Josh got it right.

There's a 4 into 1 log  manifold that equally feeds all the turbos. Efficient? Who knows without knowing what type of engine it is, that its intended use is, and what the specs are on the turbo.

We are nowhere near as dumb as Pat looks.