# Twin turbo
**URL:** https://forums.speedlife.net/t/twin-turbo/110808
**Category:** SON240sx Automotive
**Created:** [November 5, 2007, 6:43pm UTC](https://forums.speedlife.net/t/twin-turbo/110808 "2007-11-05T18:43:01Z")
**Posts on this page:** 16
**Page:** 1
### Author:  [@Ko-San](https://forums.speedlife.net/u/Ko-San)
#### Post date: [November 5, 2007, 6:43pm UTC](https://forums.speedlife.net/t/twin-turbo/110808/1 "2007-11-05T18:43:01Z")
just out of curiosity
has anyone on this forum done a twin turbo setup for the 240sx?
im not sure if its possible but i remember reading an article somewhere.
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### Author:  [@Fobwall](https://forums.speedlife.net/u/Fobwall)
#### Post date: [November 5, 2007, 6:47pm UTC](https://forums.speedlife.net/t/twin-turbo/110808/2 "2007-11-05T18:47:27Z")
I think Acidz has done a 2JZ swap. Farmer has done an RB26DETT in his but it’s now single turbo.
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### Author:  [@kollo](https://forums.speedlife.net/u/kollo)
#### Post date: [November 5, 2007, 6:48pm UTC](https://forums.speedlife.net/t/twin-turbo/110808/3 "2007-11-05T18:48:08Z")
yeah on a rb26dett setup but not on a ka its too much power even if you put small turbos on with a low boost its a waist of money just do a rb25det so its only one turbo to dseal with
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### Author:  [@snowboard\_240sx](https://forums.speedlife.net/u/snowboard_240sx)
#### Post date: [November 5, 2007, 6:48pm UTC](https://forums.speedlife.net/t/twin-turbo/110808/4 "2007-11-05T18:48:30Z")
theres an article somewhere on the net about a twin turbo sr20det…completely pointless
There is no use for two turbos on 4 cylinder engine. it could not produce enough back pressure to make it worth while.
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### Author:  [@Ko-San](https://forums.speedlife.net/u/Ko-San)
#### Post date: [November 5, 2007, 6:52pm UTC](https://forums.speedlife.net/t/twin-turbo/110808/5 "2007-11-05T18:52:00Z")
so two small turbos on a sr
would have no effect on the spool up lag?
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### Author:  [@alesserfate](https://forums.speedlife.net/u/alesserfate)
#### Post date: [November 5, 2007, 7:05pm UTC](https://forums.speedlife.net/t/twin-turbo/110808/6 "2007-11-05T19:05:15Z")
Well it depends… I think its doable… SR stock is tight on producing exhaust CFM but you could do some stuff…
Twin turbo usually comes in parallel or sequential. Parallel being two turbos the same size, sequential, one is bigger than the other.
However both of those usually used in slightly higher displacement engine than SR’s so you would need to use something like the following. The problem would lie in the amount of exhaust an SR produces (CFM) and how much would take to fully spool two turbos of specific sizes. There is a key concept, sequential setup, I believe porsche used/uses where the manifold is set up such as the exhaust gas would first flow through the bigger turbine, than the smaller one, thus to make two turbos work well on a smaller displacement engine. They would be as far apart in size as possible where the smaller one would spool really early, and max out just about where the bigger one would spool up, and once the big one would build pressure it would open a external wastegate/bypass for the smaller one to relief exhaust gas flow stress from the big turbo.
This would definately be a custom set up and cost alot of money. And then theres the twin-charged (both turbo and super charged) s15 on youtube which is pretty sick as well.
If you want twin turbo I would go 2JZ or RB26, but one big turbo is always easier to deal with.
Hope I could help.
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### Author:  [@alesserfate](https://forums.speedlife.net/u/alesserfate)
#### Post date: [November 5, 2007, 7:06pm UTC](https://forums.speedlife.net/t/twin-turbo/110808/7 "2007-11-05T19:06:05Z")
And yes sequential twin turbo would help reducing turbo lag as the smaller turbine would provide the power at lower rpms, while the bigger one at the end, resulting in a broad powerband.
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### Author:  [@Solarian](https://forums.speedlife.net/u/Solarian)
#### Post date: [November 5, 2007, 7:31pm UTC](https://forums.speedlife.net/t/twin-turbo/110808/8 "2007-11-05T19:31:13Z")
While it doesn’t make sense to do TT on a 4 banger for various reasons, the new twin-scroll turbochargers give you a lot of the benefits while being as clean and simple as a single.
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### Author:  [@duckJAI](https://forums.speedlife.net/u/duckJAI)
#### Post date: [November 5, 2007, 7:37pm UTC](https://forums.speedlife.net/t/twin-turbo/110808/9 "2007-11-05T19:37:17Z")
just like in initial d stage 4
the black FD vs the keisuke’s yellow one
i \<3 I.D
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### Author:  [@Ko-San](https://forums.speedlife.net/u/Ko-San)
#### Post date: [November 6, 2007, 3:26pm UTC](https://forums.speedlife.net/t/twin-turbo/110808/10 "2007-11-06T15:26:55Z")
> [@Portal](https://forums.speedlife.net/t/portal/14785/2):
>
> Well it depends… I think its doable… SR stock is tight on producing exhaust CFM but you could do some stuff…
>
> Twin turbo usually comes in parallel or sequential. Parallel being two turbos the same size, sequential, one is bigger than the other.
>
> However both of those usually used in slightly higher displacement engine than SR’s so you would need to use something like the following. The problem would lie in the amount of exhaust an SR produces (CFM) and how much would take to fully spool two turbos of specific sizes. There is a key concept, sequential setup, I believe porsche used/uses where the manifold is set up such as the exhaust gas would first flow through the bigger turbine, than the smaller one, thus to make two turbos work well on a smaller displacement engine. They would be as far apart in size as possible where the smaller one would spool really early, and max out just about where the bigger one would spool up, and once the big one would build pressure it would open a external wastegate/bypass for the smaller one to relief exhaust gas flow stress from the big turbo.
>
> This would definately be a custom set up and cost alot of money. And then theres the twin-charged (both turbo and super charged) s15 on youtube which is pretty sick as well.
>
> If you want twin turbo I would go 2JZ or RB26, but one big turbo is always easier to deal with.
>
> Hope I could help.
lol im not doing it I was just wondering and being curious good info though
thanks guys I kinda get why a TT wouldnt work well on SR engines
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### Author:  [@Canadian\_Idol](https://forums.speedlife.net/u/Canadian_Idol)
#### Post date: [November 6, 2007, 8:36pm UTC](https://forums.speedlife.net/t/twin-turbo/110808/11 "2007-11-06T20:36:26Z")
If your car comes with single turbo - keep it. Otherwise why anyone would opt for twins is a mystery. You have to buy two of everything! And twice the failure possibilities.
My homeboy is turbo’ing his Z. Keeps talking about APS this and Greddy that…dude put on the single Turbonetics kit and be done with it. Says it can’t make power…oh really tell that to the Grand National guys.
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### Author:  [@s13Junkyard](https://forums.speedlife.net/u/s13Junkyard)
#### Post date: [November 6, 2007, 9:27pm UTC](https://forums.speedlife.net/t/twin-turbo/110808/12 "2007-11-06T21:27:53Z")
…
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### Author:  [@Cal-SoY](https://forums.speedlife.net/u/Cal-SoY)
#### Post date: [November 6, 2007, 10:42pm UTC](https://forums.speedlife.net/t/twin-turbo/110808/13 "2007-11-06T22:42:29Z")
^^^
BOMB DIGGITY!
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### Author:  [@Solarian](https://forums.speedlife.net/u/Solarian)
#### Post date: [November 7, 2007, 8:17am UTC](https://forums.speedlife.net/t/twin-turbo/110808/14 "2007-11-07T08:17:16Z")
> [@2G-Money"](#):
>
> If your car comes with single turbo - keep it. Otherwise why anyone would opt for twins is a mystery. You have to buy two of everything! And twice the failure possibilities.
>
> My homeboy is turbo’ing his Z. Keeps talking about APS this and Greddy that…dude put on the single Turbonetics kit and be done with it. Says it can’t make power…oh really tell that to the Grand National guys.
Single can make power just fine, but it presents the same logistics stupidities on a V configuration that twins do on an inline motor.
You already have two exhaust manifolds, might as well stick a snail on each and make use of the shorter piping and hotter exhaust gases.
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### Author:  [@Canadian\_Idol](https://forums.speedlife.net/u/Canadian_Idol)
#### Post date: [November 7, 2007, 8:32am UTC](https://forums.speedlife.net/t/twin-turbo/110808/15 "2007-11-07T08:32:52Z")
True but I’m just looking at cost & relaibility to hp gains. Turbonetics puts down documented 360whp on 91 and I believe 460whp with lower compression.
For $5500 and 6-8hr install its the best but for sure. But mad tyte tunerz need twinz yo.
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### Author:  [@Solarian](https://forums.speedlife.net/u/Solarian)
#### Post date: [November 7, 2007, 12:51pm UTC](https://forums.speedlife.net/t/twin-turbo/110808/16 "2007-11-07T12:51:03Z")
Reliability is pretty much based on how good your tune is. And I’d be very interested to know what’s included in that $5500, because I wouldn’t call anything without a fuel return system, and being tuned with something lower end than a UTEC, reliable. You can get a Greddy TT kit, with the intercooler, UTEC and AAM Fuel Return Basic for 7 grand. If you get all that for $5500 with the Turbonetics, then it makes sense, but otherwise, I’d rather go Greddy.