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Old 11-27-2006, 02:29 AM   #1
Twin or single turbo application?
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From: Seattle, WA
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I Drive: Audi A4 S

My Project: 190E
Love the power of a single turbo but I also love the decreased lag in a twin turbo...

Which one gets your vote and why?

Doesnt the sequential twin turbo on the 3rd gen RX-7...isnt one turbo bigger than the other?
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Old 11-27-2006, 02:48 AM   #2
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Quote:
Originally Posted by beansbaxter View Post
Love the power of a single turbo but I also love the decreased lag in a twin turbo...

Which one gets your vote and why?
Igotabike (from PNWRiders) took me out in the new BMW 335 coupe last Tuesday. Must say, the twins in it kicked major ass.

Felt real torquey, with hardly any lag. Wish I drove the 6sp one, but all they had was the Steptronic (which still shited damn good in manual mode!).
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Old 11-27-2006, 09:26 AM   #3
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From: Spo-kompton EWU
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I Drive: s10 drifter

My Project: my truck and the mustang
i vote twin and not just because its two hair dryers in there but decreased lag and more power is a plus...
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Old 11-27-2006, 10:12 AM   #4
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I Drive: 1990 Accord EX

My Project: 1990 Accord EX
twin turbo = more things that can go wrong and way more expensive (take the nissan 300z for instance) but more bang for the buck

Single turbo = still a chance of problems but a little less expensive to fix and of course the great lag monster


now with that aside twin turboz rock sockz but i don't think I'd ever buy one
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Old 11-27-2006, 11:01 AM   #5
mjn
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I Drive: Depends on the day...

My Project: '47 Crosley roundside pickup
Our '06 GTI has (of course) a single turbo....no lag whatsoever. None.
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Old 11-27-2006, 12:11 PM   #6
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From: Moscow, Idaho
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I Drive: 2006 Yamaha R6, 1991 nissan 180sx, 95 neon sport beater

My Project: Pulled the sr20det for the second time and winter modding time
well for you beans a rx7 with a wankle is just the wrong engine.

The LS1 just plain rips in the 7's.

Back to the original question I prefer a single application for the highway and top speed pulls that i find the most fun. I have full boost right at 2800rpm's and it pulls plenty hard in my 2400lb car. I don't need 2 turbo's to reduce lag because who drives around under 3,000 rpm's in a car designed to rev? If I don't want the lag of a single turbo I simply downshift. It really depends on what the car is for and the overall goal of the vehicle. I have a good friend building a 03 svt cobra swapping a 5.4L dohc w/ gt40 heads, who is going twin turbo. It's more for the shocka factor but will easily throw down 1k to the tires on the pump and that could be reached either single or twin. For me personally it's just more cost effective to go single and reach my goal.
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Old 11-27-2006, 04:26 PM   #7
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Thats been a good question for a long time, big singles are easier to set up but having two makes it all smooth.. but also takes up a lot of space. 90% of the go fast club have it single no doubt just for the simple fact its easier to set up and doesn't take up as much space, also better cooling with having one
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Old 11-28-2006, 11:29 AM   #8
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I Drive: You're mom and sister wild...at the same time

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singles make more power...easier. Twins are great for the street, but if we're talking big power, single is the way to go. A big one. All those 8sec supras...single. What's the first thing a supra (most common TT tuning car) does to make more power? Convert to big single turbo. Twins help smooth it out, but with today's ball-bearing turbos and lightweight internals, lag is nearly non-existent. (Especially on VW's that boost at a puny 12lbs or so. :p )
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Old 11-28-2006, 03:26 PM   #9
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I've got a special spot in my heart for twins but a single can be sized properly enough to do the job better. Guess its all on purpose and application...
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Old 11-28-2006, 03:33 PM   #10
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Originally Posted by Sefus View Post
Guess its all on purpose and application...
Can say that about most mods.
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Old 11-29-2006, 12:42 PM   #11
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Exactly. Its like asking 'what gun is best for hunting'.
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Old 12-01-2006, 09:59 PM   #12
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twin turbo rx7's have TWIN turbo's. they're the same. and they're retarted as well. very overly engineered design. cool idea, but impractical for anyone with a budget that has to maintain their cars. why not just get the right turbo and be done with it. ?
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Old 12-02-2006, 08:28 AM   #13
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I Drive: You're mom and sister wild...at the same time

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Quote:
Originally Posted by rodgers View Post
twin turbo rx7's have TWIN turbo's. they're the same. and they're retarted as well. very overly engineered design. cool idea, but impractical for anyone with a budget that has to maintain their cars. why not just get the right turbo and be done with it. ?
That's a great way of putting it. You can use twins to fool the driver into thinking there's no lag, or get a properly set up single that won't lag.
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Old 12-02-2006, 02:15 PM   #14
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Quote:
Originally Posted by ted_garlock View Post
That's a great way of putting it. You can use twins to fool the driver into thinking there's no lag, or get a properly set up single that won't lag.
It's not even all about the turbo. I have a huge turbo in my car (eclipse gsx)(60-1( flows max 60lb/min)) and have it setup with the proper tuning equipment I can push 22lbs sitting in my garage.
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Old 12-02-2006, 07:41 PM   #15
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I Drive: 96 240SX 90 300ZXTT

My Project: 96 240SX with Full JIC FLT-A2 Susension, Sr20DET, 300ZX brake kit, etc
Single turbo and twin turbo applications should be taken relative to the car if you want to make more power. Like inlines make MUCH more power off single turbo kits than twins, and V-motors benefiet much more from the two, one charger for each bank of cylinders. And Buddah, you don't know what you're talkin about with 300Zs, even before I upgraded mine to an HKS kit, I never had a single problem with the stock system.
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Old 12-13-2006, 01:53 AM   #16
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I Drive: You're mom and sister wild...at the same time

My Project: Getting enough money for an M3
^^^has no idea what he's talking about, and a postwhore
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Old 12-13-2006, 03:51 AM   #17
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I Drive: 96 240SX 90 300ZXTT

My Project: 96 240SX with Full JIC FLT-A2 Susension, Sr20DET, 300ZX brake kit, etc
Pffff Ted hasnt driven a car over 250 HP in his life....I PISS more than 250Hp...Turbo'd...
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Old 12-13-2006, 11:47 AM   #18
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I Drive: You're mom and sister wild...at the same time

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^^^^Lying - and doesn't know my driving experience. And is a postwhore
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Old 12-13-2006, 12:27 PM   #19
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I Drive: 96 240SX 90 300ZXTT

My Project: 96 240SX with Full JIC FLT-A2 Susension, Sr20DET, 300ZX brake kit, etc
Ok Ted, what have you owned? gimme sum numbers hoe
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Old 12-13-2006, 05:51 PM   #20
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I Drive: You're mom and sister wild...at the same time

My Project: Getting enough money for an M3
It's not what I've owned, but what I've driven. Start at the beginning: 68 Bug fully set up suspensionwise with a 2028 motor running on alcohol = 200+whp and under 1600lbs (track car), 1970 911 with an overbored and stroked motor (3.2L) making 280ish whp and under 2300lbs, 1986 Porsche 944 Turbo with turbo swap and other upgrades - claimed over 350whp and about 2400lbs, 1987 Porsche 911SC stock making 200ish whp and 2800ishlbs, 1991 Porsche 930 Turbo making a dyno'd 510rwhp and corner-bablanced at 2750lbs. It's great having a dad with wealthy, trusting friends in the PCA. Only the Beetle and the 1970 911 were his, all the rest were quick test drives at Driver's Education events. Oh, and a 914 with about 180hp and 240ft-lbs ot torque weighing in at 1400lbs - my favorite out of all of them. So, list it off, your 300zx?
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Old 12-14-2006, 01:51 PM   #21
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I Drive: 96 240SX 90 300ZXTT

My Project: 96 240SX with Full JIC FLT-A2 Susension, Sr20DET, 300ZX brake kit, etc
Well we can go the bug route-63 ragtop with a 1st gen rotary RX7, kennedy adapter, upgraded IRS Bus Tranny, running mid 10s, YES my 300ZX, which I will admit is NOT a Quarter mile car, but for track, or highway, next to nothing could take it. I would have to say my biggest NUMBERS car I am SURE you have seen was my roommate Scotty's 97 GTS Viper that was SRS Supercharged with a 300 Shot, full SCCA Cage, Sparco Harness' ECU and header upgrades, hitting 922 at the wheel. I KNOW you've seen that one. I've dragged that a few times, and Driven it to most the events it went to because Scotty didnt have a liscence.




OH yeah, and my best friends dad has a sweet 75 912E that Ive gotten to take out a handful of times, THAT is a fun car. Brown tho...
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Old 12-14-2006, 06:09 PM   #22
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I Drive: You're mom and sister wild...at the same time

My Project: Getting enough money for an M3
912's were made from 1965 to 1969, than ceased until 1976 when they made a 912E. He must have a 76.
http://www.912registry.org/history.htm
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Old 12-15-2006, 03:02 AM   #23
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From: Spokane
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I Drive: 96 240SX 90 300ZXTT

My Project: 96 240SX with Full JIC FLT-A2 Susension, Sr20DET, 300ZX brake kit, etc
Maybe it is a 76, its freakin gorgous, he had the motor built really well, beat my buddies VR4 light to light on Division! Heres a couple pics-

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Old 04-27-2008, 03:55 AM   #24
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From: Camas, WA
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Nice Viper with the kenny bell on it...

Single are good.

Twins are good. (for the 8 sec supras with a single, there are 6 sec mustangs with twins or *gasp* a centrifical supercharger on 'em)

Then of course there are the twin screw boys from uncle Keneth and mr Whipple...

They are all good systems.

The best one for you, is the one you have or the one you can tune or the one your engine builder likes...
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Old 05-02-2008, 11:52 PM   #25
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From: Kennewick, Washington
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I Drive: 93 civic si, 00 civic si

My Project: nothing
Single turbo is always the most efficient, but as has been said, the application is the key. Mark the GTI spools up quick because it has a very small turbo, and they do have a little lag.

Turbo on my car is retarded. NA all the way.
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Old 05-03-2008, 08:17 AM   #26
mjn
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I Drive: Depends on the day...

My Project: '47 Crosley roundside pickup
Wow...that is one sweet 912 man!
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Old 10-23-2008, 05:33 PM   #27
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My Project: 95 Eclipse, Another Rabbit, and whatever car I get at the auctions!
Neither..........


Bi-turbo FTMFW

t88H top turbo
followed by a t78

Boost at 1300 rpm and full boost of main turbo at 4200 hold at 31psi. throughout rpm range
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Last edited by Mikercw; 10-31-2008 at 07:26 PM.