The key is to find a pair of turbos that work the best with each other in the rpm range your aiming for, with the fuel to back it up.įor towing you want maximum torque, so aiming to have the larger turbo operating at maximum efficiency or at least well into its powerband around 3500-3000rpm's would be well suited. Other side of that is now the turbo only has half the energy to extra to run the compressor.Īs always, there's much more going on in each system but that's a start on it.įor power efficiency compound turbo's is my favorite setup, with both high power applications and for towing.
The turbine is less of a restriction as now only one side of the engine (in a V configuration) because it only has to pass 1/2 the exhaust that a single did. If they are both putting out 10 psi, the manifold sees 10 psi but the air mass can be doubled if sized right. Twins are two identical turbochargers feeding into a common plenum. There's a bit more going on than that, but in a nutshell. The smaller turbo gets on speed sooner and covers the "dead zone" while the larger spins up. One of the advantage sof this system is the primary can produce more boost at a lower IAT, but since it's big, it's slow to get on speed. The primary feeds it's output to the secondaries input. It sounds like you're using "twins" and "compounds" interchangeably (it's also kind of hard to read one really loooong paragraph).Ī compound uses a larger "atmospheric turbo as the primary and a smaller one as a secondary. We are not here to argue back and forth like children, but to piece together the puzzle and increase the knowledge of the system for all. BY THE WAY!!! if you post, refrain from rude remarks. Will I one day have a compound turbo 6.5L? you bet ya! Will it be practical? Not a chance. If you are going for all out performance on the strip or just making big numbers with a modded pump where you need extra air volume, I can see a set of twins being practical. I think for most of us, a medium-sized single at the most would be just fine. Below 40psi+, it just seems like it having a set of medium-sized twins would be pretty impractical, and you wouldn't be using the turbo's to their true potential.
#Compound sequential turbo mods#
The practical use of twins to me is if you are running enough fuel for about 40psi+ of boost from the system, something I really wouldn't trust on a 6.5L to begin with unless it had enough supporting mods to handle it. Yeah, maybe a GM-4 with a GM-8 would be fun, but you would only be able to practically run about 20 psi out of the whole system, and back pressure from the GM's is not all that good. The downfall is not many of us are running enough fuel to make a set of compounds practical. I believe the twins would also spool a lot faster/earlier than say a large single turbo. But take the same concept with something a little more realistic and that runs less back pressure to begin with, like an HX-40 or something (I am not sure how efficient those are, but you get the idea) and it would be a pretty golden system. Now, I am by no means saying that is an ideal setup, because it is not. Now each turbo would only be supplying 15psi, and the amount of air substantially increased, and also it brings the GM-3 a bit closer into it's efficiency range. Now, if you were to run compounds, each turbo would only have to work half as hard to create boost, so say you compound with an ATT or something. It is hard on the motor, hard on the turbo, and the GM is already well out of it's efficiency range. Hypothetically, It would be like trying to run a GM-3 at 30psi. Compound turbos to me increase the efficiency of the entire turbocharging system. Keep in mind I am young and stupid So here it goes. Yes, it may be wrong, it may not be factual at all, but it is the impression I get. I am just going to throw out my concept of compound turbos. I can honestly say I have sure contemplated it, but I simply do not have enough practical use for it. Well it seems that there is some argument going on about twins, so let's just get this out the way here and not so much hijack another thread.
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