Twin charging

[jamesm]

Yep, the internal bypass that some blowers use to reduce parasitic loss could do something like that (I assume, obviously never tried it lol)

[mid_life_crisis]

Originally Posted by Draco-REX

The thinking of a twin charged, or compound charged, setup like a Twin-Screw + Turbo is the that supercharger provides a responsive throttle with mid-range grunt, filling out the torque curve of a larger turbo. As mentioned above, a supercharger (especially a PD blower) allows you to spool a larger turbo than would normally be practical for a specific engine size.

It's more about response and "area under the curve" (useable power) than maximum power. You're not getting Blower torque + Turbo torque. You're getting whichever is higher at any given moment.

This part was understood. The question is how to make it work well enough to be worth the trouble and if there are any "traps" to be avoided that could cause blown motors and other unpleasant things.
I still think the whole thing is accomplished a lot easier by just using two different sized turbos.

An "unspooled" turbo still spins. And even if the impeller was stationary, air will still pass through it easily. There's no need for a separate intake pathway. The Supercharger will pull through the turbo without a problem.

The turbo, intercooler (I assume there will be one), piping...
I just have my doubts about how well this would work in reality. I understand the theory, but I worship at the altar of the great and powerful Murphy. This just seems too complicated to be reliable on the street.

[Tansey86]

Twin charging almost never makes sense anyways. Hellion makes a hellraiser kit to add twin turbos to the existing eaton blower on cobras and gt500's and the twins by themselves make more power.

[jamesm]

Originally Posted by Tansey86

Twin charging almost never makes sense anyways. Hellion makes a hellraiser kit to add twin turbos to the existing eaton blower on cobras and gt500's and the twins by themselves make more power.

...once they're spooled up. No denying peak power would be reduced. That's not the intention.

[Genomaxter]

Twin charging is totally worth it. Only problem is it is always very custom, costs more than your car is worth + lagniappe, and isnt reliable since you will break a lot of stuff. Just look up Ronin's compound charged Exige (now called the 211 RS).

[rusty959]

Originally Posted by mid_life_crisis

This part was understood. The question is how to make it work well enough to be worth the trouble and if there are any "traps" to be avoided that could cause blown motors and other unpleasant things.
I still think the whole thing is accomplished a lot easier by just using two different sized turbos.



The turbo, intercooler (I assume there will be one), piping...
I just have my doubts about how well this would work in reality. I understand the theory, but I worship at the altar of the great and powerful Murphy. This just seems too complicated to be reliable on the street.

Ever been in a turbo car and watched a boost/vacuum gauge while you punch the throttle under the RPM you make boost?

I don't have a turbo on my BRZ, but in my old DSM that spooled at about 3k with a fmic etc, it would go strait to atmospheric pressure as soon as you hit the gas. Then when the turbo spooled you would hit boost of course. Regardless, I can back Draco up in that a supercharger wouldn't have an issue pulling through an unspooled turbo.

Regardless, I am sure you would get better response with a positive displacement supercharger/turbo twin charged system. What im not sure of is that it would be worth the extra weight and expense. That being said I don't have a problem dealing with a tiny bit of lag, so I may not be the best person to hear from. Id love to see someone do it though.

[Tomzilla]

[ame="https://www.youtube.com/watch?v=HmscSzFurwg"]The World's Fastest Lotus? - TUNED - YouTube[/ame]

I'll just leave this here..

[EAGLE5]

Ridonculous. Just put some nitrous on for a quick spool. Way cheaper. Or ignite an open exhaust port with some unburnt gas. Heck, for the cost, put an LS7 in the engine bay.

[Staf00]

How about AVO + Votech? It would seemingly fit pretty well if it was: intake --> SC --> turbo --> intercooler --> engine. Sequentially compounded boost throughout the entire powerband of course, not bypassed in stages or w/e. Basically a sequential turbo setup except one of the turbos is powered by the belt instead of exhaust. The Vortech would have top end and helps spool the AVO turbo sooner I imagine. Keep in mind that the Vortech comes first, feeding the AVO turbo directly w/o an intercooler in between. We don't really need to worry about how much boost the Vortech is producing since thats predictably manageable via the chosen pulley size. AVO kit would have a wastegate to manage the combined total boost, but we'd prolly want to have it set to more than 7psi. The compressor in the AVO kit might not flow enough efficiently though, but I really like the placement/fitment nonetheless. A Rotrex C30-94 (or C38 even) + GTX2867 turbo would be so cool too! I know I'm about to get a ton of negative feedback, but w/e...lol

[Fett4Real]

http://www.motorauthority.com/news/1...n-fr-s-concept