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Old 11-02-2001, 04:53 PM   #1
FuJi K
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Talking opinions on Sequential Turbochargers for an Impreza

Sequential Turbochargers

how about it? any opinions? Comments? inputs?

FuJi K
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Old 11-02-2001, 04:59 PM   #2
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I think it's a waste considering our small RPM band that we have to work with.
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Old 11-02-2001, 05:00 PM   #3
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Lightbulb Probably no need...

for the cost of putting it in, it's better to run a single-turbo setup and tune it to perfection. For EJ25, there's enough torque down low already. Also, a sequential setup usually involves complex piping that our engine bay doesn't have room. Maybe a twin-turbo setup for an H6, but H4s are fine with single turbo.
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Old 11-02-2001, 05:37 PM   #4
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Fuji: Haven't you posted a topic similar to this at least once before?

I don't think it's worth doing it. What would be the goals? If you're looking for quick spool up you can get a smaller ball-bearing turbo and be on-boost real fast. If you're looking for high boost you're going to need a big, laggy turbo.

And if you want to twin-turbo with both of those, you'd probably need a complicated mess of tubes and controls to switch from one turbo to the other. Unless you plan on putting the small one in front of the big one. But the huge backpressure of the second turbo behind the first probably negates all of the advantages of the small, quick turbo up front.

This feels like deja vu, I'm sure I've posted this in one of your threads before.
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Old 11-02-2001, 05:52 PM   #5
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Most cars that come with a sequential turbo benifit from converting it to a single turbo system. I firmly believe an appropriately sized single turbo would be more than sufficient.

-Jon
www.nothingserious.net
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Old 11-02-2001, 06:00 PM   #6
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fuji do you forget the answers to these questions? we've gone through this ALOT before with you. :monkey:
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Old 11-02-2001, 06:57 PM   #7
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i just thought i should bring this topic up because the Toyota Supra Turbo uses the sequential setup.

That's all, i just want some opinions and comments on this type of setup..........


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Old 11-02-2001, 07:14 PM   #8
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Quote:
Originally posted by FuJi K
i just thought i should bring this topic up because the Toyota Supra Turbo uses the sequential setup.

That's all, i just want some opinions and comments on this type of setup..........


FuJi K
and so do many other cars! but they are not optimal with those setups (and most are NOT 4 cylinders!)
If you did some studying you would have found many replace both turbos with a better single turbo
damn this is annoying me!
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Old 11-02-2001, 08:36 PM   #9
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Chill dude. Subaru uses a twin turbo setup on some Legacys. Sequential superchargers, uh no.
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Old 11-02-2001, 08:39 PM   #10
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Quote:
Originally posted by SubaFastR
Chill dude. Subaru uses a twin turbo setup on some Legacys. Sequential superchargers, uh no.
Quote:
Originally posted by kaos200

(and most are NOT 4 cylinders!)
:monkey:
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Old 11-02-2001, 09:22 PM   #11
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the legacy B4 twin turbo also has a 7k+ rpm redline IIRC. and i'm not sure if it is a Sequential system or not. please read the replys you got on the last thread you posted about putting a twin turbo system in the impreza. i'm not even going to get into it. if you want twinturbo than just buy a supra,300zx,rx7...........etc. since you have the most driving experence in the world you can probably handle any one of these cars no problem right?
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Old 11-02-2001, 10:03 PM   #12
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The B4 is not sequential: half of the cylinders drive each of the turbos, so both are producting boost at the same time.

Here is a pic of the Syms twin turbo header:



Fuji K, stop asking the same question over and over, the answers aren't changing.


Ben

Last edited by bsquare; 11-02-2001 at 10:09 PM.
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Old 11-02-2001, 11:10 PM   #13
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oh well.........okay...................

i'll think of something to ask another time..........


Until then............get ready to lecture again!!!:monkey:


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Old 11-03-2001, 03:12 PM   #14
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I'm pretty new to this bored, but I thought I'd throw my 2 cents in. DO NOT attempt to make a twin turbo, twin S/C, or twin charged Impreza. like the other guys said, if you want a twin turbo get a Supra, 300ZX, VR-4 or RX-7. Unless you have the cash to order the Legacy motor. Which is the B4 Blitzen. Also that motor is a 2.5liter DOHC too if I'm not mistaken. Bad ass car, but not the best Subaru has made by a long shot. Anyway, you would be way better off with something like a T3/T04 ball bearing and a good top mount intercooler. Ludespeed turbo kits are some of the best now that he has stopped using those old intercoolers and moved to using Spearcos. Thats what I have and love it.
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Old 11-03-2001, 03:53 PM   #15
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The B4 RSK is the twin turbo Legacy. The Blitzen is a further development of that car in association with Porsche. They both use the EJ20. The motor will not with in an Impreza as the driver's side piping interferes with the steering.


Ben
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Old 11-05-2001, 01:00 PM   #16
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bsquare,
B4RSK and Legacy GT-B is sequential twin turbo.
A lot of people don't like sequential twins because it has a drop in torque when the secondary turbo kicks in. It's like having a turbo lag twice.
Hardcore B4 people swap Impreza single turbo in and also the aftermarket turbo kits tends to convert sequential turbo to parallel twin turbo. The SYMS kit you posted is one of those sequential to parallel conversion kit.
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Old 11-05-2001, 05:12 PM   #17
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There are no other components to the conversion than the headers? Converting a 3rd gen RX7 to parallel is a pain in the ass.


Ben
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Old 11-05-2001, 08:43 PM   #18
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Header and aftermarket main ECU will be needed to convert sequential to parallel in B4 RSK.
Removing cat will be no-no in this conversion if stock tubines are used, because the turbines will over-rev.
I considered about this parallel twin idea a while ago and almost bought the B4 motor but now i'm thinking about dropping in Impreza WRX single.
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Old 11-05-2001, 08:46 PM   #19
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Quote:
Originally posted by go go go
Header and aftermarket main ECU will be needed to convert sequential to parallel in B4 RSK.
Removing cat will be no-no in this conversion if stock tubines are used, because the turbines will over-rev.
I considered about this parallel twin idea a while ago and almost bought the B4 motor but now i'm thinking about dropping in Impreza WRX single.
uhh how do you figure that the turbos will overrev just because they are catless???
that is controlled by the wastegate...
sorry if I took what you are saying the wrong way, but it doesnt make sense to me
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Old 11-06-2001, 03:02 AM   #20
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Boost(pressure) is controlled by the actuator(wastegate), but the rpm of the brade depends on the flow and there is no limit.
I once understood why taking the cat off from parallel conversion would over-rev, but I forgot. I'll find it out.
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Old 11-06-2001, 07:33 AM   #21
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so parallel is a better way if i want twins? hehee

i am planning to have a 9000rpm rev-band on the 2.5L closed deck and all............

oh well...............i'll tune in to your conversation and learn something


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Old 11-06-2001, 05:48 PM   #22
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Quote:
Originally posted by FuJi K
so parallel is a better way if i want twins? hehee

i am planning to have a 9000rpm rev-band on the 2.5L closed deck and all............

oh well...............i'll tune in to your conversation and learn something


FuJi K
dude just get your license first I'll consider that an accomplishment.
then start dreaming about your "Super RS"
if you go about it the way you make it sound in your posts and site you're in for one hell of a disappointment.
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Old 11-06-2001, 09:48 PM   #23
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lol koas, you make me laff
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Old 11-07-2001, 08:06 AM   #24
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i would of gotten my permit/license last year when i just turn 15 but there wasn't money to get it so i just backed off.

who cares.................do you? i'm still gonna make my Super Impreza!!!!!


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Old 11-07-2001, 08:18 AM   #25
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You have a rich fantasy life, please keep it to yourself.
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