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Old 01-31-2005, 11:16 PM   #1
BuggatiV
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Question Sequential Turbochargers

Where are they placed? are they besides each other? where else would they be placed??

Last edited by BuggatiV : 02-01-2005 at 05:45 PM.
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Old 02-01-2005, 01:17 AM   #2
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Quote:
Originally Posted by BuggatiV
I need alot of info about sequential turbochargers, I need someone who really knows their stuff to answer my questions. Thanks.
How does sequential turbochargers work? where are they placed? what are the cons? which two would be best? ie one small and one large? and would they need more air for both to work at the same time? or can just one work? ie if there isnt enough air can the smaller one work alone?


Diesel or petrol?
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Old 02-01-2005, 01:40 AM   #3
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Quote:
Originally Posted by BuggatiV
I need alot of info about sequential turbochargers, I need someone who really knows their stuff to answer my questions. Thanks.
How does sequential turbochargers work? where are they placed? what are the cons? which two would be best? ie one small and one large? and would they need more air for both to work at the same time? or can just one work? ie if there isnt enough air can the smaller one work alone?

I know but I dont have time to tell you. Sorry.
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Old 02-01-2005, 05:44 AM   #4
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basically ones bigger, ones smaller, the small one spools up, and then the bigger one spools up a little later in the rpms... my friends supra is sequential... the small one spools up at about 2000, and then at aabout 300-3500 the 2nd one spools up gives it a lot more power
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Old 02-01-2005, 03:54 PM   #5
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thanks

Quote:
Originally Posted by mazda6man
basically ones bigger, ones smaller, the small one spools up, and then the bigger one spools up a little later in the rpms... my friends supra is sequential... the small one spools up at about 2000, and then at aabout 300-3500 the 2nd one spools up gives it a lot more power

THanks for your help.
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Old 02-01-2005, 04:04 PM   #6
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what confuses me about sequential turbos is that if only one works at one time, then what happens to the exhaust gases when it switch.

In an I6 only 3 header ports are connected to one turbo right? then the turbo wont be getting engough gasses to spool it up.
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Old 02-01-2005, 04:30 PM   #7
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do a search on these forums, we had a topic about it a while ago and it was pretty informative.
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Old 02-01-2005, 04:57 PM   #8
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Originally Posted by Wally
Diesel or petrol?

didnt know you could have diesel turbochargers..
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Old 02-01-2005, 05:06 PM   #9
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[quote=CarEXPERT]what confuses me about sequential turbos is that if only one works at one time, then what happens to the exhaust gases when it switch.

When it starts off, the smaller turbo would kick in and then when at higher rpm, the bigger one starts working as well, so both are in use. I think the exhaust from the smaller would go through the bigger one but there wouldnt really work until there is more exhaust.
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Old 02-01-2005, 05:14 PM   #10
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Quote:
Originally Posted by CarEXPERT
I know but I dont have time to tell you. Sorry.


well, thanks so much for your input.

Theoretically, can you take something like a supra TT and get same size turbos? You'll have insane turbo lag, but the high end RPMs would make up for it. Thoughts?
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Old 02-01-2005, 05:15 PM   #11
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Quote:
Originally Posted by BuggatiV
didnt know you could have diesel turbochargers..

most modern diesels have turbos,

Not to be a post whore:

The idea behind is that you dont het so much turbo lag, becuase your entire driveable engine range is covered by a turbo, so the power is more evenly delivered, the disadvantages, more things to go wrong, uses more fuel, more expensive to implement, complicated to service. Good for some aplications especially with restrictive class rules or emisions regulations where turbos can be made cleaner than super chargers.
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Old 02-01-2005, 05:38 PM   #12
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Originally Posted by Godlaus
well, thanks so much for your input.

Theoretically, can you take something like a supra TT and get same size turbos? You'll have insane turbo lag, but the high end RPMs would make up for it. Thoughts?

hmm, but why would you want so much lag? unless your only racing and not street driving, and even then theres so many other options to get the same power and less lag.
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Old 02-01-2005, 10:49 PM   #13
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Quote:
Originally Posted by BuggatiV
didnt know you could have diesel turbochargers..

Yes they are fairly common, if not in the US then elsewhere (I understand US diesel does not have all the desirable properties found in other countries).

cinqyg, a turbo charged engine has a more consistent MEP because of lowered expansion ratios, thus a smoother power stroke.

Godlaus, twin turbo doesn't mean you will have more lag than a single setup. There are lots of combos that will give adequate response. If you look at a SAAB you may see a turbo being powered by half it's cylinders for instance. On the flip side, guys here convert the twin turbo soarer V8 to a single unit for better performance.

BuggatiV you are right. A hybrid designed for the application could well see good spooling throughout the range.
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Old 02-01-2005, 11:46 PM   #14
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Quote:
Originally Posted by BuggatiV
hmm, but why would you want so much lag? unless your only racing and not street driving, and even then theres so many other options to get the same power and less lag.


just if you had something like an s2000 (not positive on the TT setup on that engine), and it's already powerful as a NA motor, and the lag won't really slow it down in the low RPMs, and having same size turbos would be kinda cool to brag about, and it would be awesome to have that major pull at the top end.

Wait, same power less lag? You just talking about a powerful supercharger? or basic NA tune up parts?
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Old 02-02-2005, 12:33 AM   #15
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Originally Posted by Godlaus
just if you had something like an s2000 (not positive on the TT setup on that engine), and it's already powerful as a NA motor, and the lag won't really slow it down in the low RPMs, and having same size turbos would be kinda cool to brag about, and it would be awesome to have that major pull at the top end.

Wait, same power less lag? You just talking about a powerful supercharger? or basic NA tune up parts?

I think same sized twin turbos spool up hella slow because only half of the exhaust gases is going into the first one and the other half go into the second. An S2000 is I4 so would a twin turbo work? only 4 exaust ports so only 2 ports control one turbo. Are there any I4 with twin turbos?
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