Quickly Clarified - Sequential vs Parallel Turbos

In the previous Quickly Clarified episode, we went over what single scroll and twin scroll turbos are along with their benefits and disadvantages. In today’s video, we’ll be going over what sequential and parallel turbo systems are, what are the differences and what are their strengths and weaknesses.

Songs:
Gran Turismo - Like the wind

alainite - Explore This (prod. WISHBOI)

[sshep]

There are a few errors in this presentation, twin turbo applications are broken down into dual (one turbo per bank), parallel (twin turbos with a common hot side), compound (one turbo raises the boost above atmospheric, the second boosts to final, the turbos run continously), and sequential (smaller turbo boosts the larger turbo and the smaller drops off at a set rpm/pressure, only one turbo provides boost at a time minus a small transition time).

[rifleman]

Thanks for the information and subsequent corrections. I would like to use a dual turbo setup (one per bank) on a 5.2L based 383 Stroker (500HP-600HP NA) in a Chevy S-10. Although ideally a dual compound setup would be outstanding if theres enough room in the engine bay. Small turbo blown into the Large turbo continuously (1000HP+). Unless I'm missing something obvious that would prevent this from working correctly.

[Kohzeenook]

I will help you out ok a sequential turbo looks like a compound set up but the main purpose is this when you have one a engine that is two small to spool both turbos you allow the air to be cut off on on turbo allowing it to spool the first turbo once the air is enough then they close the wastegate and the second turbo turns on.



The issue is this can be done in a different combinations you could have two same size turbos. Only reason you would do this is because the engine is to small to efficiently feed both turbos air at low RPMs without it being so much lag… or you could have one small and one large which looks like a compound setup but is slightly different.


The reason for one small and one large is if the small turbo runs out of power the bigger one kicks in at high rpm’s and continues the power curve.


Now a compound turbo feeds the bigger one into the smaller to double the boost pressure with less effort from the smaller turbo.. it helps it stay efficient and could be used for big power over 50-100psi sometimes more but often billet engines or diesel engines are usually the only motors who could handle that type of boost.


It’s very confusing because a sequential could look like a compound if you want it to it could be a sequential component where you only want it to compound once the little one runs out

Sequential only means to turn one turbo once later that’s it after that you can make it compound or simply just feed the motor without compounding


Compound is strictly feeding the bigger turbo into the intake side of the smaller one like a air filter to force the little one to take more air by force and not actually from it sucking in air on its own will

[gd]

The music makes me feel like I'm in an 80's boutique store or something.

[mobilkencengchannel]

Twin parallel turbo usually for V shape engine, due to header length to reduce turbo lag CMIIW

[prepaidsteam]

Sequential or parallel can work on inline 3 engine like kei truck 660cc?