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  1. #1
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    Default How does a twin-turbo set-up work?

    Old topic, but I did a search and didn't find the answers I was looking for I've read the entire post over at club-si about turbos. I've also searched at How things work.com

    I removed the battery from the engine bay and that created a ton of room in there....anyways, I have the Kaminari front bumper and am thinking that I could have the intakes pointing down towards the openings in the bumper if I took the fog lights out. So intakes are no problem....Now, I already have one turbo in there where the cat used to be, so that's one turbo down. There is a ton of space where the battery used to be, so I know that another turbo would fit there....but here's where the questions come in.

    (1) The MITS TEO4H I have i've been told spools up very quickly; therefore, this would take care of the low end boost, but for another turbo for top speed boost, What size turbo do I need?
    (2) How do I get this larger turbo to kick in only at a certain higher rpm range?
    (3) Does the intake for the second turbo only suck in air when it is spooling.....at the higher rpms?
    (4) What happens to the first turbo and intake when I'm in the higher rpms?
    (5) How will the piping work with running the turbos through an intercooler? Will I need 2 intercoolers?
    (6) How does the throttle body work with 2 turbos running into it? Do I need 2 throttle bodies, and if so, how do I do that?
    (7) Will I need some kind of gate or something that blocks the intake air from the turbo/intake not being used at the moment and then releases it to the atmosphere via BOV??
    (8) How much crazy ass HP could I expect from a set-up like this?

    I know that there are some twin turbo cars out there, I'm just very curious to find out how their twin turbos work. [img]images/icons/confused.gif[/img]

  2. #2
    [FJ] Specialist icemanZX3's Avatar
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    Default Re: How does a twin-turbo set-up work?

    I dont know if this will help but read up on alot of info about the 2JE-GTZ twin turbo Supra Engine and the VG30DETT 300ZX twin turbo engine...


    I know it might sound stupid but look at a Chilton book of these two cars..It might tell you how each one is constructed and how the two turbos go into one throttle body and how the fuel system is set up.....

    If I am wrong..somebody set me right [img]images/icons/grin.gif[/img]

    btw, I know those engines are V6's but at least it gives you some idea of how it might work on a V4

  3. #3
    Egz
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    Default Re: How does a twin-turbo set-up work?

    I wish i could answer those bud. But haven't you blown up enough engines already? [img]images/icons/wink.gif[/img] If you were to do this, go make yourself an AWD setup. Then you'll be ready to take on the big boy WRC Focus. [img]images/icons/grin.gif[/img]

  4. #4
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    Default Re: How does a twin-turbo set-up work?

    <blockquote><font size="1" face="Verdana, Arial">quote:</font><hr>Originally posted by icemanZX3:
    btw, I know those engines are V6's but at least it gives you some idea of how it might work on a V4<hr></blockquote>

    V4???? You been smoking that crack again?? LAst time I checked, we had an INLINE 4?? [img]images/icons/confused.gif[/img] [img]graemlins/evilgrin.gif[/img]

    But yeah, I am trying to figure out how this works as well. The 91 MR2 was a Twin Turbo one as well. I will look for info right now!

  5. #5
    [FJ] Specialist icemanZX3's Avatar
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    Default Re: How does a twin-turbo set-up work?

    <blockquote><font size="1" face="Verdana, Arial">quote:</font><hr>Originally posted by Jays2000ZX3:


    V4???? You been smoking that crack again?? LAst time I checked, we had an INLINE 4?? [img]images/icons/confused.gif[/img] [img]graemlins/evilgrin.gif[/img]

    <hr></blockquote>

    Yeah well it was short for 4-cylinder..im just lazy!!!

  6. #6
    Mammoni
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    Default Re: How does a twin-turbo set-up work?

    I'm useless... but the lazy way is I-4 (I, V, L, W refer to cylinder configurations... V and L are generally used interchangably although I really think of L-engines as being 90o and V being anything less than that).

    BTW, since you don't seem to plan to merge your intake pipes at some point, how are you going to control two MAFs?

    One question regarding twin turbos is what you want to do with them. Do you want two small ones in parallel (not sure what the advantage would be) or two sequential ones? Most importantly, what are your goals and what do you hope to achieve?

  7. #7
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    Default Re: How does a twin-turbo set-up work?

    <blockquote><font size="1" face="Verdana, Arial">quote:</font><hr>Originally posted by Ducman69:
    BTW, since you don't seem to plan to merge your intake pipes at some point, how are you going to control two MAFs?

    One question regarding twin turbos is what you want to do with them. Do you want two small ones in parallel (not sure what the advantage would be) or two sequential ones? Most importantly, what are your goals and what do you hope to achieve?
    <hr></blockquote>

    I don't know if I will need 2 throttle bodies or not. I know if both intakes/turbos put air into the same throttle body, then they are going to have to be merged somewhere. I just don't know how you control which intake/turbo is on at what rpm and so forth.

    I should have been more clear, or perhaps you didn't read the whole thread, DUCKY??? [img]images/icons/tongue.gif[/img]

    I want to keep the turbo I have now, it's a smaller one MITS TEO4H which will spool up fast enough for me, but for serious HP up in the higher rpms, I want a second huge mofo turbo. I really don't know what my goals are as of yet, I was thinking that I wanted upwards of 400HP at the wheels, but I still haven't made my mind up.

    rotten EGZ, I got your blown engine right here! [img]graemlins/evilgrin.gif[/img] , no really I do... [img]graemlins/lol.gif[/img]

    [ 02-18-2002: Message edited by: RoRo ]</p>

  8. #8
    Senior TEAM Member Rally Man's Avatar
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    Default Re: How does a twin-turbo set-up work?

    No don’t take this as law, but you might want to check out the Audi S4 guys. I think the S4’s have a bi-turbo setup; one is a small turbo for quick spool time and a bigger one for the high end of the engine. I think on the Supras one turbos air goes into the second and into the intercooler and right into the engine. Well I’m hope I’m right with some info here.

  9. #9
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    Default Re: How does a twin-turbo set-up work?

    uh i thought that twin turbos wasnt very effective on engines with one cylinder bank. I thought you needed to have a V configuration.

  10. #10
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    Default Re: How does a twin-turbo set-up work?

    <blockquote><font size="1" face="Verdana, Arial">quote:</font><hr> I thought you needed to have a V configuration. <hr></blockquote>

    what about the rotory motors, the rx-7 had a twin turbo. i see alot of cars that dump the twin set up for one large turbo for the big power.

  11. #11
    Mammoni
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    Default Re: How does a twin-turbo set-up work?

    Generally yeah... otherwise you'd only have two cylinders per turbo (1,3 and 2,4). So I'm not sure how two small turbos parallel turbos would be better than one large turbo.

    Roro, I was reading, but you were talking about TBs and I was talking about MAFs. Just pointing out another issue. I don't know either, so I'm of little help. [img]images/icons/wink.gif[/img] I've only skimmed over an RX7s setup before.

  12. #12
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    Default Re: How does a twin-turbo set-up work?

    I don't think you can put a twin turbo there ! huh !

    Cause you has I know, the twin turbo cars have one turbo for 3 or 4 cylinders and another one for the 3 or 4 others one !

    So you use the twin turbo for V6 or V8 i thought.

  13. #13
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    Default Re: How does a twin-turbo set-up work?

    Actually if you open the hood of a supra they run an I-6 configuration not a V-6, and the mr-2 didn't have twin turbo it had twin entry turbo. Single turbo, two air intakes. I had a freind with a 90 mr-2 with a 92 j-spec turbo engine.

    Rodney what do you plan on doing with two turbos, if you want big power that spools quickly, I know a kid with an Integra and a T4 drag turbo, he says there is little to know lag with that big of a turbo. Maybe you can do that instead of twin turbo.

    [ 02-18-2002: Message edited by: focus---R ]</p>

  14. #14
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    Default Re: How does a twin-turbo set-up work?

    There are two ways to do twin turbo. Sequential or parrallell. Parallell is where there are two independent turbos like one on each side of a v6.

    Sequential is two in a row. Basically one starts while letting some go to the 2nd turbo and some out of the exhaust. The "pre-spools" the 2nd turbo. Then it appears that a complex arrangement of vaccum lines, switches and solenoids work with the ECU to operate valves to direct air toward the 2nd turbo.

    http://homepage.ntlworld.com/peter.b...ips/turbos.htm

    Here is something I was thinking about though. What if you had a really small turbo with a moderately large turbo that hung off of it's wastegate. Am I stupid for thinking that would work?

  15. #15
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    Default Re: How does a twin-turbo set-up work?

    Ideally this is a great idea. Have a small resposive turbo up to RPM X, then pre-spool the big whopper turbo and switch over once it is wound up for crazy ass top end power. Reality has shown us that the gains of these systems are marginal (Supra sequential vs. single upgrade) and the complexity and reliablity are problems (RX-7). For that kind of money and power levels a better solution can be found. I would investigate the larger aerocharger turbo or a Garrett GT ball bearing turbo would offer outstanding transient response with crazy-ass top end power.


 
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