The main reason twin turbos were introduced was for V6 or V8 engines where the headers are completly on opposite sides. Instead of running plumbing from one side of the engine to the other to meet up with the single turbo. Two turbos would be placed, one on each side giving equal effeciency.

The second reason is if you want extreme power which one turbo cant supply or if you want little lag and high performance which two small turbos can supply.
There is NOT a single good reason to do twin turbos on a 4cylinder unless it has a very large displacement engine like 3.0-4.0 and even then to get any benifit, turbo selection would be extremly important.

The 92 Dodge Stealth your speaking of is a V6 engine with a single turbo on each side. So for that car it makes perfect sense.

Thanks,
Vik

 

Just an FYI, the F2 setup wasn't "twin" turbo, it was a sequential turbo setup.

I really have never seen a dual-turbo four-cylinder setup in any form of serious motorsport.

As far as twin-charging, Hahn Racecraft has been developing a "Super Turbo" kit for the new Sport Compacts that come Roots blown from the factory.

"Twin Charging" is usually a turbo feeding into a roots-style blower, but Ive seen two roots blowers on top of each other, but that was more of a "my junk is bigger than yours" pro-street thing. I guess there are some nutjobs in the southern outlaw scene that run twin centrifugal blowers, too.

 

What the freak man, because gldse can't spell "acinine" my thread gets locked? lol!

Anyway, Ok people so here's a real thread that shouldn't get locked, because it's not about f2 vs FS or FS vs whoever else, it's about Forced Induction baby!!!!

If a single turbocharger can do better than a twin turbo, whats the point of 2 turbos??? 92 dodge stealth R/Ts are pretty nice twin turbo cars :/ How bout a supercharger--> turbocharger setup?

My Advice to you is, if you don't want this one locked to keep me out of it.....
Mkay sweetheart ? :lock:

The REAL point of twin-charging was mostly for 6 Cyl Vehicles, You have 2 exhaust manifolds so you need 2 turbos to be Efficient. And Enough about my Spelling already.

 

when a mod or admin locks a thread u don't make a new to keep your fight going
and u don't need 2 turbos to be Efficient most upgrade to ONE large one

 

wow, intelligent.


keep it up

 

I think it's a "Coolness" Factor with a sequential setup, 1 turbo can do the work of 2 if you tune the exhaust and intake impeller size.

 

and u don't need 2 turbos to be Efficient most upgrade to ONE large one

I've known a lot of TT Supra owners that do that.

Jason

 

I've known a lot of TT Supra owners that do that.

Jason

But that's for Drag-only, since the large singles don't spool until much higher up in the RPM range. A lot of the 1200-1500 horsepower "Modified" class 2JZs run twins, because the powerband is broader than a big single.

 

I've known a lot of TT Supra owners that do that.

Jason

yeh its popular.


they both have their Highs/Lows depending on the setup, performance wants, drivability, etc.

but this (f2) is for coolness.

 

But that's for Drag-only, since the large singles don't spool until much higher up in the RPM range. A lot of the 1200-1500 horsepower "Modified" class 2JZs run twins, because the powerband is broader than a big single.

That is not true at all. A properly sized single spools just fine for road course work and the fastest supra guys are still running singles. heh

 

But that's for Drag-only, since the large singles don't spool until much higher up in the RPM range. A lot of the 1200-1500 horsepower "Modified" class 2JZs run twins, because the powerband is broader than a big single.

That's not necessarily true. I used to know a guy who had a Supra with a single turbo conversion that only made about 450hp. His turbos were on the way to the junk heap, so rather than buy two new stock turbos (or replacements for stock turbos...either is $$$$), he bought one top-flight well-sized turbo and spent some money on a new custom manifold and piping revision. Car drove like it had a big V8. Spooled reasonably early and made a mountain of power.

 

i know of a few reasons to run twin turbo's...

1... ushually running smaller twins then one large single... faster spool time

2... more total airflow compared to boost pressure...

amung a few other things...

and a few reaons to run single...

1... cheaper overall costs....

2... less piping/junk in engine bay....

3... can net same performance gains as twins...


it all really depends on the motor/car the turbo's are going in... twin turboing a 4cyl doesnt make much sence to me... but thats just me...

most of the time, twin setups are used on v-series engines... and one of the main reasons being is because of revs... most 4cyl motors can safely turn 7000 rpm stock... which would be great for a large single turbo.... as where most v-series motors shouldnt see more then 5200 rpm...

o well... it all just depends i suppose... but that foci did look neat...

-AcId-

 

That's not necessarily true. I used to know a guy who had a Supra with a single turbo conversion that only made about 450hp. His turbos were on the way to the junk heap, so rather than buy two new stock turbos (or replacements for stock turbos...either is $$$$), he bought one top-flight well-sized turbo and spent some money on a new custom manifold and piping revision. Car drove like it had a big V8. Spooled reasonably early and made a mountain of power.

In the 2JZ supra world, 450 isn't a "mountain" of power. Guys push the stock twins to 600ish at the wheels. When I say "Big Single" I'm talking 82+ mm.

 

In the 2JZ supra world, 450 isn't a "mountain" of power. Guys push the stock twins to 600ish at the wheels. When I say "Big Single" I'm talking 82+ mm.

Stock twin supras don't make 600whp and do you have any clue how big an 82mm turbo is? rofl. You can make 750+whp easily on a 71mm. Most supra guys don't run anywhere near an 80+mm turbo.

 

Stock twin supras don't make 600whp and do you have any clue how big an 82mm turbo is? rofl. You can make 750+whp easily on a 71mm. Most supra guys don't run anywhere near an 80+mm turbo.

Really? So the guys I used to deal with werent running 8.80s in their street cars with a single 88? I guess I should have told them that so they could take those goofy-looking parachutes off the back of their cars.

I said "Big Power" supra guys run big singles. I never said that stock twin turbo supras make 600. I said there were guys pusing 600 through their stock twins.

And in my day-to-day, 82mm is a small turbo.

 

the few that are around here are T78 or T88 i think thats what the greddy kit is i have seen 850+hp from them with other bolt on's and it spools just fine on the street

 

Really? So the guys I used to deal with werent running 8.80s in their street cars with a single 88? I guess I should have told them that so they could take those goofy-looking parachutes off the back of their cars.

Yea, since so many 8.80 cars are street cars. Yea, I run with those guys, too. They're street cars, too. Street car is a pretty damn loose term... any car that makes 1200+whp is not much of a street car.

I said "Big Power" supra guys run big singles. I never said that stock twin turbo supras make 600. I said there were guys pusing 600 through their stock twins.

Ok, then why even begin to compare big power supras to road course duty? That is about retarded. And again, no, stock twin supras do not make 600whp. Not on boost, anyway.

And in my day-to-day, 82mm is a small turbo.

I guess your day to day life is dealing with tractor trailers or other large diesel engines.... have fun with that.

 

the few that are around here are T78 or T88 i think thats what the greddy kit is i have seen 850+hp from them with other bolt on's and it spools just fine on the street

Keep in mind, though, that a greddy T88 is NOT an 88mm turbo.... it is actually quite a bit smaller than a Garrett T76.

 

The problem with talking to supra guys is some of them claim more power than they have because everyone knows thay can easily make it. This is obviously not all of them just a handfull. Sorry Gutted Hatch but the stock factory equipped turbos CANNOT make even close to 600WHP. Even with every bolt on and internal mod the stock units are just too small.

Also guys keep in mind that turbo technology within the past 10 years has greatly improved. So a 1995 twin turbo supra had quick spool for the time but todays single turbos can match the same spool and have even more top end power. It's not like the factory turbos are always the highest quality, good quality aftermarket units are better for performance than o.e. units.


Vik

 

yes i have seen a hks twin do 900 and some change i know the t88 isnt 88mm :lol:

 

In the 2JZ supra world, 450 isn't a "mountain" of power.

That's absolutely true. To the rest of humanity, however, 450 is a lot. That particular car handled and braked as well as it accelerated.

Guys push the stock twins to 600ish at the wheels. When I say "Big Single" I'm talking 82+ mm.

That's also true. Something else in the favor of a (properly sized) single is that, at least on the Supra, getting rid of the bizarre factory piping with it's baffles and sequential trap-doors and what not, can be worth a good bit of power by itself when using a modern turbo.

Most cars that came as twin-turbocharged from the factory (Supra, 3000 GT/Stealth, Skyline GT-R, RX-7) are from an era where turbochargers were not as efficient or adaptable as modern units, so it was easier to use some odd Rube-Goldberg style pipe routing to make a sequential system work.

 

Hocky > Greg

/thread.

 

^^The 300z's had TT as well.

Jason

 

90-96 TT 300 ZX AWESOME CAR !!!

Very Quick.

 

yeah they were nice cars. I'd love to get my hands on one.

Jason