Twin Turbo
Is everyone forgetting the Veyron? QUAD-turbo!
I agree with most people here. Twin turbos were never outlawed, just $40K Japanese imports became unreasonable for most, and sales dwindled.
Good luck if you go through with this, it would be interesting to see, but seems outrageously expensive to get everything custom-made. Unless you can do it yourself?
I agree with most people here. Twin turbos were never outlawed, just $40K Japanese imports became unreasonable for most, and sales dwindled.
Good luck if you go through with this, it would be interesting to see, but seems outrageously expensive to get everything custom-made. Unless you can do it yourself?
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It can be cheaper if you custom make it yourself but you have to know how to weld and understand engines and turboing very well. Here is an example (http://www.homemadeturbo.com/forum/i...?topic=19375.0). I know it is a Honda but the principles still apply. If you could custom make everything yourself then you could probably make a single turbo setup for even less (unless maybe you can get 2 properly sized turbos for extremely cheap).
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Not trying to be mean (it just comes naturally), but your hypothesis doesn't hold water. There are currently several companies selling street legal twin turbo'd cars, Mercedez, Audi, Porsche, Volvo, and BMW for starters.
Notice something about them? Yeah, they all European. Let's see, autobahn, liberally high speed limits, engine displacement penalties, and high gas prices conspire to give the Europeans a bit of an edge.
Japan has 42 mph speed limits, so twin turbo cars aren't for normal Japanese folks.
Dig deeper to find out why there isn't a single twin turbo Japanese auto for sale in the US. What you'll uncover is (as stated) the purchase price was getting out of hand, but also the insurance industry did their best to kill them with outragious premiums.
So why all these Euro whips ridding around with double boost then you ask? Simple, it's a lot easier to sell a high dollar European car than a high dollar Toyota or Nissan. Sure, things are changing, but not that fast.
And before you ask, if you are looking at spending 120k on a Bi-turbo Cayenne, my guess is that the $1500/mo insurance premium isn't going to kill the family budget.
And I forgot to add, this simply can't be overstated: Twin turbos belong on V motors only. Double boosted inline set ups are silly.
Notice something about them? Yeah, they all European. Let's see, autobahn, liberally high speed limits, engine displacement penalties, and high gas prices conspire to give the Europeans a bit of an edge.
Japan has 42 mph speed limits, so twin turbo cars aren't for normal Japanese folks.
Dig deeper to find out why there isn't a single twin turbo Japanese auto for sale in the US. What you'll uncover is (as stated) the purchase price was getting out of hand, but also the insurance industry did their best to kill them with outragious premiums.
So why all these Euro whips ridding around with double boost then you ask? Simple, it's a lot easier to sell a high dollar European car than a high dollar Toyota or Nissan. Sure, things are changing, but not that fast.
And before you ask, if you are looking at spending 120k on a Bi-turbo Cayenne, my guess is that the $1500/mo insurance premium isn't going to kill the family budget.
And I forgot to add, this simply can't be overstated: Twin turbos belong on V motors only. Double boosted inline set ups are silly.
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From: Redneck Riveria
Originally Posted by Scott8
I don't think the thread starter did a huge amount of research on this topic.
I was also nieve at 18 about a lot of car stuff
I was also nieve at 18 about a lot of car stuff
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From: TN
This thread is a PRIME example of "a little information can be a dangerous thing". Twin Turbo's banned from the US because of emissions..... 
Who you been feeding you that load of crap.
2008 US SPEC: Skyline GTR.
Twin Turbo VQ engine
est. hp 450
est. tq 380ish
Engine is expected to handle a lot more than that stock.
Spotted in Michigan....And No it was not imported. This is a US vehicle
Who you been feeding you that load of crap.2008 US SPEC: Skyline GTR.
Twin Turbo VQ engine
est. hp 450
est. tq 380ish
Engine is expected to handle a lot more than that stock.
Spotted in Michigan....And No it was not imported. This is a US vehicle
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As mentioned there are still cars running twin setups. But I would venture to say that with new technology always coming out on the FI front, single turbo systems will end up being better performing setups in the long run anyway (Which is usually the case with streetable setups). With more efficient units, variable vane technology, etc you will have a harder time out doing what a properly designed single turbo setup will do unless you are pushing ridiculous amounts of boost (which really is a waste on a street legal FWD and most cars in general). On the tC I would say you will benefit little if at all over a properly designed single turbo setup and will gain mostly bad things, like weight, complexity, problems making it all fit, underhood temps, etc.
The only real benefit I could see at all with sequentially charging a tC would be if you could find a good roots style supercharger to provide a more linear gain down low and still get it to fit under our hood with our intake setup.. then you gotta get the turbo in there somewhere as well
All in all I see it being nothing more than a "look what I did" kinda thing.
On a V engine, twin charging has some nice benefits due to the way the exhaust is set up, but I have even seen RX7 twin turbo owners replace the twin setup with one larger turbo and end up better in the long run.
The only real benefit I could see at all with sequentially charging a tC would be if you could find a good roots style supercharger to provide a more linear gain down low and still get it to fit under our hood with our intake setup.. then you gotta get the turbo in there somewhere as well
All in all I see it being nothing more than a "look what I did" kinda thing.
On a V engine, twin charging has some nice benefits due to the way the exhaust is set up, but I have even seen RX7 twin turbo owners replace the twin setup with one larger turbo and end up better in the long run.
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I've done all the research I could and found nothing, and jus coz I'm 18 don't mean I'm naive to anything having to do with cars. I may not know as much as a 30 yr old but I'm not far from it considering most ppl in my family were mechanics (but that was back when Hot Rods were big lol) Also the new Skyline is not a twin-turbo get the facts from a Nissan dealership. I talked to one and they have a 450hp V8 with a single turbo I think. From what I remember the guy said it has the same engine as one of the new Lexus IS's coming out that yr. Even though all I really got from this topic was, "This is pointless in a inline car." "Why its too much work?" "Unless its a V motor its stupid." Once again proving points that most ppl on here flame instead of help. Engifineer and scionofPCFL you 2 are probly the only ones that made sense in explaining without flaming. Anyways since I couldn't find anything I just changed my topic to somethin else. So a mod plz close this Thanx.
Thomas
Thomas
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From: TN
Originally Posted by unique_tc_upgradez
I've done all the research I could and found nothing, and jus coz I'm 18 don't mean I'm naive to anything having to do with cars. I may not know as much as a 30 yr old but I'm not far from it considering most ppl in my family were mechanics (but that was back when Hot Rods were big lol) Also the new Skyline is not a twin-turbo get the facts from a Nissan dealership. I talked to one and they have a 450hp V8 with a single turbo I think. From what I remember the guy said it has the same engine as one of the new Lexus IS's coming out that yr. Even though all I really got from this topic was, "This is pointless in a inline car." "Why its too much work?" "Unless its a V motor its stupid." Once again proving points that most ppl on here flame instead of help. Engifineer and scionofPCFL you 2 are probly the only ones that made sense in explaining without flaming. Anyways since I couldn't find anything I just changed my topic to somethin else. So a mod plz close this Thanx.
Thomas
Thomas
To that end, the rumor mill in Japan says that the production GT-R will have a front-mounted, twin-turbo, 3.8-liter V-6 engine that's a development of the 350Z's unit. Nissan's original plan to do a V-8 has been axed because the engine is too big and heavy to provide the dynamic balance the engineers want. The V-6 will reputedly produce 450 hp and 370 lb-ft of torque. The power will be sent to all four wheels via a seven-speed transmission. The all-wheel-drive system will feature a development of the GT-R's famed, torque-sensing, electronic ATTESA E-TS, matched to four-wheel steering.
You were sayingSorry, the GTR(Nissan) is NOT using a motor coming from a Lexus IS(Toyota).
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From: TN
All it takes is a little research dude......Google is your friend.
http://www.edmunds.com/insideline/do...topanel..1 .*
http://www.roadandtrack.com/article....rticle_id=4650
http://www.edmunds.com/insideline/do...topanel..1 .*
http://www.roadandtrack.com/article....rticle_id=4650
Originally Posted by Road&Track
Photos of a masked Nissan GT-R lapping the Nürburgring last fall received more hits on the Internet than Miss USA did after a night out on the town. The reason: Despite its expected price tag of about $70,000, the GT-R will be the most alluring Japanese sports machine to come our way since the Acura NSX in the mid-1990s. Previously sold only in Japan, the GT-R (Skyline GT-R as it was formerly known) has been an icon to boy racers and aftermarket tuners alike since the R32 appeared in 1989. The upcoming version, which will hit dealer showrooms in late 2007 or early 2008, will be the first model marketed worldwide, thus the first official version available in the U.S. Nissan has remained mum regarding this sixth-generation model, but we have discovered some interesting new tidbits about the car.
Nissan CEO Carlos Ghosn confirmed that the GT-R will be built in Japan. The chassis will be assembled in the company's Tochigi factory while the powerplant will be produced at its Yokohama engine plant. The official logo for the car has also been released. As for the performance of the GT machine, here's what we know so far.
Power will come from a 3.7-liter version of Nissan's VQ powerplant. A PAIR of turbochargers will help it produce about 450 bhp and 360 lb.-ft. of torque. Because longtime fans of the GT-R are accustomed to more output via aftermarket tuning, Nissan has seemingly left some room on the table for buyers wanting to increase the power of their GT-Rs.
Stock boost pressure will be limited to about 10 psi, but we hear that the engine is capable of handling a lot more. A tamer version of this V-6, codenamed VQ37HR-TT, will make its way into the upcoming Infiniti G35 Coupe. Key differences between the engines are that the GT-R's VQ will have the twin turbo_chargers, lighter pistons and connecting rods, as well as a beefed-up crankshaft. Other custom parts may make their way into the engine, including racing profile camshafts and new valvetrain. It will come mated to a Getrag 6-speed transmission or a paddle-shift sequential automatic with seven or eight gears.
The GT-R will have awesome stopping power, especially if it wears the same brakes spotted during testing at the Ring. Gold-colored Brembo calipers sparkled in the sun as the GT-R attacked the famed Nordschleife. Upon closer inspection, the fronts appeared to be 6-pot calipers. As for the car's handling, we're pretty sure that it will be all-wheel drive, with a new version of Nissan's ATTESA system. For the record, the car had little trouble negotiating the Carousel at more than 110 mph. Its lap times were reported to be around 8 minutes flat, quite impressive for a test mule on a somewhat crowded track. Could it match or eclipse the Porsche 911 Turbo's time in the 7-minute-40-second range in an all-out effort? The answer awaits us in just a few months. — SM
Nissan CEO Carlos Ghosn confirmed that the GT-R will be built in Japan. The chassis will be assembled in the company's Tochigi factory while the powerplant will be produced at its Yokohama engine plant. The official logo for the car has also been released. As for the performance of the GT machine, here's what we know so far.
Power will come from a 3.7-liter version of Nissan's VQ powerplant. A PAIR of turbochargers will help it produce about 450 bhp and 360 lb.-ft. of torque. Because longtime fans of the GT-R are accustomed to more output via aftermarket tuning, Nissan has seemingly left some room on the table for buyers wanting to increase the power of their GT-Rs.
Stock boost pressure will be limited to about 10 psi, but we hear that the engine is capable of handling a lot more. A tamer version of this V-6, codenamed VQ37HR-TT, will make its way into the upcoming Infiniti G35 Coupe. Key differences between the engines are that the GT-R's VQ will have the twin turbo_chargers, lighter pistons and connecting rods, as well as a beefed-up crankshaft. Other custom parts may make their way into the engine, including racing profile camshafts and new valvetrain. It will come mated to a Getrag 6-speed transmission or a paddle-shift sequential automatic with seven or eight gears.
The GT-R will have awesome stopping power, especially if it wears the same brakes spotted during testing at the Ring. Gold-colored Brembo calipers sparkled in the sun as the GT-R attacked the famed Nordschleife. Upon closer inspection, the fronts appeared to be 6-pot calipers. As for the car's handling, we're pretty sure that it will be all-wheel drive, with a new version of Nissan's ATTESA system. For the record, the car had little trouble negotiating the Carousel at more than 110 mph. Its lap times were reported to be around 8 minutes flat, quite impressive for a test mule on a somewhat crowded track. Could it match or eclipse the Porsche 911 Turbo's time in the 7-minute-40-second range in an all-out effort? The answer awaits us in just a few months. — SM
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Originally Posted by lastlookcustoms
With a proper tune, the emissions are fine... I am running no cats on my 94 supra twin turbo and it passes emissions here with flying colors...
Guys, correct me if I'm wrong.
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Also keep in mind, japanese cars have upgraded the technology out of n/a engines. 350z, 08 supra, et cetera. No turbos needed today to get the same amount of power as they were putting out before.
Just a suggestion, do not put a twin turbo on a 4-cyl motor. It is as much a waste as putting dual exhaust on one. As mentioned many times before, V motors work best for TT setups.
Just a suggestion, do not put a twin turbo on a 4-cyl motor. It is as much a waste as putting dual exhaust on one. As mentioned many times before, V motors work best for TT setups.
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How can you guys really fool the system to make the emission test pass? If i wanted to get my car turboed, it has to be either with or without cat, if I decided to go without the cat, how can I fool the system to pass the test? I don't know anybody in TX who have turbo with no cat has pass the emission test.
