Sequential Turbo

[Reignstarz]

Just starting a thread to see what you guys think about a Sequential Turbo setup.

Advantages?

Disadvantages?

[Sarthos]

If you're talking about what I think you're talking about, it tends to be awesome

The turbo acts smaller at the low end so you get boost at low throttle and minimal turbo lag, then when you rev higher the turbo opens more like a large turbo so you can get a ton of boost at the top end. Because you have boost on the low end, your car also never falls out of boost when you shift. So you could run a knife edged crank a balance shaft delete a lightweight flywheel and everything, and still stay in boost when you shift.

The disadvantage of it is that it has more moving parts so it's more likely for something to go boom

[gloryaccordy]

Unless you need 300lb ft of torque at 1800 rpm & 6500 rpm, prob not worth the complexity

Good idea in theory, but even manufacturers w/teams of engineers & multi billion dollar research/prototyping resources couldn't get it right in cars like the RX-7.

Better to go w/what's tried and true, and just get a good sized single turbo

[quaidum]

the twin turbo supra is a sequential turbo stock and i see all to many people making them single or just standard issue twin

the manifold needs to house both turbos and has a restrictive flow between the two
not for performance IMO mainly for a streetable car that needs low end torque to get out in traffic or get some reasonable gas mileage with some performance as well

[Reignstarz]

If you're talking about what I think you're talking about, it tends to be awesome

The turbo acts smaller at the low end so you get boost at low throttle and minimal turbo lag, then when you rev higher the turbo opens more like a large turbo so you can get a ton of boost at the top end. Because you have boost on the low end, your car also never falls out of boost when you shift. So you could run a knife edged crank a balance shaft delete a lightweight flywheel and everything, and still stay in boost when you shift.

The disadvantage of it is that it has more moving parts so it's more likely for something to go boom

Yeah it's kinda like that.


You use a smaller turbo for low end since it spools faster(I believe) the bigger turbo is for top end.

apparently there's valves that are in place to cut off the second turbo till a certain rpm.


My idea was manifold with the smaller turbo and bigger turbo possible going downpipe or somewhere around there.

STS have turbos at the end of the exhaust? How is that even benficial?

[theSOB]

Yeah it's kinda like that.


You use a smaller turbo for low end since it spools faster(I believe) the bigger turbo is for top end.

apparently there's valves that are in place to cut off the second turbo till a certain rpm.


My idea was manifold with the smaller turbo and bigger turbo possible going downpipe or somewhere around there.

STS have turbos at the end of the exhaust? How is that even benficial?

thats very complex and hard to get right. One of my friends joked that u almost have to be an engineer major to do the math to get it right lol.

The other sequential turbo is a one-turbo setup. the turbo has moving parts in it that physically change the size of the turbo at certain points to give u boost throughout the powerband

[Sarthos]

I'm so glad that my major is dual in math and mechanical engineering

I know of one car that does have a sequential turbo at the end of the exhaust. It's beneficial because it runs WAY cooler than if it's in the engine bay, but you have less pressure to spin the turbo and more distance the air needs to move before reaching the engine. It's a complex setup but he's got some ridiculous power out of it.

[F22HB]

You'll have enough issues running any turbo on a honda, especially on a budget lol. Keep it simple.

[F22HB]

thats very complex and hard to get right. One of my friends joked that u almost have to be an engineer major to do the math to get it right lol.

The other sequential turbo is a one-turbo setup. the turbo has moving parts in it that physically change the size of the turbo at certain points to give u boost throughout the powerband

I remember these when they first came out. The blades adjust pitch so that they're more closed when it is spinning slow to pick up speed faster then once at speed they are straighter to allow the most flow. Makes the turbo way more efficient but also way over-complicated.

[theSOB]

I remember these when they first came out. The blades adjust pitch so that they're more closed when it is spinning slow to pick up speed faster then once at speed they are straighter to allow the most flow. Makes the turbo way more efficient but also way over-complicated.

exactly

[Joey GT-R]

So can someone explain the difference between these turbos and anti-lag?

[gloryaccordy]

I'm so glad that my major is dual in math and mechanical engineering

I know of one car that does have a sequential turbo at the end of the exhaust. It's beneficial because it runs WAY cooler than if it's in the engine bay, but you have less pressure to spin the turbo and more distance the air needs to move before reaching the engine. It's a complex setup but he's got some ridiculous power out of it.

It's a variable nozzle turbo... basically I think it changes the cross area of the exhaust inlet, so that a small amount of exhaust gas still enters the turbo at a high speed and makes boost

In any case, too much for a damn CB. I rode in an untuned 14B F22A1 CB, and that shit had enough low end pull. KISS

[dbsharp]

One disadvantage is that to do it right your intake and exhaust is much more complicated than with a single.

[WilliamW]

http://www.dsmtuners.com/forums/cust...bo-set-up.html

That link was from the guys sales page... which is here

http://www.dsmtuners.com/classifieds...duction-14647/

That link was brought up in another FI thread here on CB7T.

If you wanted to do it on an accord, I think you should just buy this guys setup and "Drill out the holes"

Seriously why go through the design and everything when this guy has already done it for you!?

Besides, that thing is BAD ASS!!! Just be prepared to cut anything and everything out of your way to make it fit.

[sulimed]

i'd think SUPER(chager) turbo set up would work better. old school raily