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Old 12-29-2001, 08:25 PM   #1
Glockperfection
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Default new age STI twin turbo?

is it?
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Old 12-29-2001, 08:51 PM   #2
SSJ Char
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damn that would be sweet, but I havnt heard anything about it being TT
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Old 12-29-2001, 09:11 PM   #3
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Nope, not TT, but I heard it does have STi stickers on it somewhere... The Legacy B4 is a twin turbo'd engine.
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Old 12-29-2001, 10:37 PM   #4
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Not even the Japanese one?
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Old 12-29-2001, 11:19 PM   #5
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no all the impreza's have a single turbo, always have. over the last few years the jap spec legacy B4's have had twin turbo engines, but they still arent as powerfull as the WRX engines. the newest B4 RSK has 259 peak hp. where as all the STi and other jap spec engines for the impreza line are usually rated at 276bhp, except for some various models like the new NB, and other older models. but no factory laegacy has ever been rated at higher than 259bhp. who gives a rats ass about twin turbos anyway? you can go just as fast with one turbo as you can with two, and most often even faster.
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Old 12-29-2001, 11:19 PM   #6
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Nope,

The new age STi employs a single IHI VF-30 turbo.
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Old 12-30-2001, 05:39 PM   #7
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Twin-Turbo doesn't mean faster the single turbo.
Twin turbos ar on luxury cars to improve midrange power out put. (Legacy B4, Audi S4) I guess it makes the cars smother.
Anyway if you have a single turbo on a EJ engine it is being powered by all 4 cylinders exhust. Where in a twin turbo setup, each turbo gets 2 cylinders.
Correct me if I'm wrong.
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Old 12-30-2001, 05:47 PM   #8
Subie Gal
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the Legacy GT-B is a twin turbo too...
and all of 'em are Auto trannies

movin this to news/rumors.... as that's what's most applicable.

j.
www.subiegal.com
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Old 12-30-2001, 08:08 PM   #9
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tt's use all cylinders... it use a quick spool turbo then at a certain rpm a valve direcs the exhaust to the other high power turbo.. im pretty sure thats how it works... i think
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Old 12-30-2001, 08:51 PM   #10
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There are two types of Twin Turbo setups.

Sequential, like the Supra and Legacy Twin Turbos.

Non-Sequntial, like the Audi S4 and I believe the Skyline.

I think a non-sequantial setup on a EJ20 type engine could work pretty well. Two smaller faster spolling turbos. You could keep the low compression and hopefully get decent high end with alot of low and mid range.
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Old 12-30-2001, 10:34 PM   #11
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yah, the B4s have a 400-500 lb weight penalty on their little brothers, being a larger car. The twin turbo allows the heavier car to get off the line relatively quickly despite the extra weight, and minimizes the turbo lag, since the first turbo in the sequential setup is faster spooling. Lag wouldn't be as big a deal w/ the lighter WRX, but I think the extra weight of the Legacy just makes it more noticeable, thats all. Problem w/ the small to big turbo setup is the "valley of torque" that occurs on switchover between the two. This is something that the current B4 RSKs have improved over the prior gen. Legacy twin turbos, probably w/ refined electronics.
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Old 12-30-2001, 10:49 PM   #12
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THat would be fast..
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Old 12-30-2001, 10:50 PM   #13
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VOD (valley of death), right? The sequential EJ20 motors seem to be more complex for little gain. IIRC the only non-sequential EJ motor I've seen a picture of was a 2.4 liter Aussie stroker. The exhaust pipes ran straight back from each head, so I think that each turbo was supplied by 2 cylinders. I think that the exhaust pulses would go something like this: BANG, BANG, wait, wait. I wonder if this hurts the turbo by speeding it up and slowing it down?
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Old 01-08-2002, 11:21 AM   #14
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There's a thread about twin turbos over in the factory forced induction forum.

I agree that a non-sequential, or parallel, setup would be a great idea and one that is very streetable. Low-mid range power would be up significantly and I don't know that it would overly complex. The only downside to it that I can see is that it may be unavailable for use in the WRC? which could make the development costs too high.
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Old 01-08-2002, 12:26 PM   #15
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aspera, it would be more like BANG, wait, BANG, wait.
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Old 01-11-2002, 01:17 AM   #16
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dsmawd, I guess you're right but it depends on how the primary tubes are routed. If you pair the right head up with a turbo and the left head up with a turbo, it will be different than feeding each turbo with one tube from each head.

So, how do the cylinders fire in each head?
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Old 01-11-2002, 12:01 PM   #17
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Wow, I can't believe how misinformed some of you are.

1. The EJ20TT (in the B4) is a parallel, dual stage TT setup.
2. The JDM B4 RSK comes with 206kw (280ps)...the same as the STi.
3. Two turbos are better than one! Look at the fastest drag and Top speed supras/skylines...they are all running TT setups. Examples? How about the fastest Skyline in Japan...the Veilside Skyline.
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Old 01-11-2002, 03:59 PM   #18
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The turbos on the B4 are sequential. I don't think anyone said anything different in the posts in this thread. It's not a bi-turbo setup like the S4. Twin-turbo isn't always the fastest way to a fast car. Many (most) of the fastest Supras in the US have gone with a larger single turbo. The complexity factor is much lower with a single turbo setup. This topic has been beaten to death in other threads on the board.
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Old 01-12-2002, 01:50 AM   #19
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Wow, I can't believe how misinformed some of you are? Are you talking to me?

1. Don't compare apples to oranges. 2.0l Flat 4 does not equal a 3.0l Inline 6. Packaging counts.
2. Four turbos are better that two. One turbo is better than two. Two turbos are better that one. Three turbos is just weird. It just depends on what you're trying to do...and what your'e budget is.
3. Can you explain how the EJ20TT (in the B4) is a parallel, dual stage TT setup? Explain how it works. If we are misinformed, then set us straight. I don't understand what you mean by "dual stage". I have only heard of staged turbo systems in tractor pulls.
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Old 01-12-2002, 02:12 AM   #20
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Four turbos, 1001hp.

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Old 01-12-2002, 02:20 AM   #21
aspera
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Default Bugatti B4 RSK?

Well there you go...4 turbos must be better. That engine can't be too different from an EJ20, right?
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Old 01-12-2002, 08:00 PM   #22
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whoa! 4 turbos huh?
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Old 01-12-2002, 08:25 PM   #23
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Hmmmmm
Is that the new 8.0L Bugatti V-16 or did some one duct tape four EJ20's together?
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Old 01-13-2002, 06:15 AM   #24
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Somewhere there is a man who "only" has a V12 quad turbo Bugatti...and it's inside a car that has a mouse hole for a grille.
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Old 01-18-2002, 03:32 AM   #25
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Default Re: Dori Dori Dori

Quote:
Originally posted by aspera
.
3. Can you explain how the EJ20TT (in the B4) is a parallel, dual stage TT setup? Explain how it works. If we are misinformed, then set us straight. I don't understand what you mean by "dual stage". I have only heard of staged turbo systems in tractor pulls.
B4
then click on twin turbo engine


Quote:
the Legacy GT-B is a twin turbo too...and all of 'em are Auto trannies
The Aus spec B4 has a 5 speed manual tranny.

Last edited by Adrian128; 01-18-2002 at 04:00 AM.
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