Single or Twin Turbo?
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Joined: Feb 2002
Posts: 5,645
From: Bridgewater, MA
Re: Single or Twin Turbo?
Originally Posted by ChrisUlrich
Yea because the car will probably be @ 3500lbs with me in it. I want to keep the car pretty much stock... inside and out. The only things that would be different are the performance pieces 
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Joined: Jul 2003
Posts: 1,668
From: Cliffside Park, NJ
Re: Single or Twin Turbo?
Originally Posted by RealQuick
Unless you do some serious stripping, you wont be ~3500lbs raceweight. Keeping stock interior isnt gonna help. Your probaly adding another 50-75lbs fromthe turbo kit, intercooler and plmbing. Add in the 12 bolt or 9" which is probably 50lbs heavier than the stock rear. Your gonna need a 6 point cage, subrframes (if you dont have them already)...these all add weight. Most correctly built FI fbodies are ususally in the 3700-3850 raceweight (with driver).
I am just curious of spool time and how much more power i'd make going from a T76 with a 80mm wheel to twin T67s!
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Joined: Jul 2003
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From: Cliffside Park, NJ
Re: Single or Twin Turbo?
Originally Posted by mgray
If you want to keep things stock like, how are you going to acheive that weight? Easier said, than done. Just curious.
Keep in mind that those compressors are big and you can make 1000+ hp on race gas with smaller units around 22-25 lbs.
Keep in mind that those compressors are big and you can make 1000+ hp on race gas with smaller units around 22-25 lbs.
If I can make 1000whp and give the turbos some headroom from being maxed out... then I'm good
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Joined: Sep 2002
Posts: 26
Re: Single or Twin Turbo?
Originally Posted by engineermike
Twin turbo's will make the same power as a single if they run at the same compressor and turbine efficiency. There simply is no difference as long as selection is equivalent.
All of the drag racing classes only allow 1 power adder and twin turbo's is considered dual power adders. For this reason, all of the serious guys just use 1.
If you are reaching the limit of the T-76GTS, then it would be beneficial to install a larger T-88 or T-91. In this case, you may not be able to fit a large frame turbo. However, as INTMD8 showed us, you can hide a couple of small ones down low and keep all the accessories. But, with the T-76 proven to 1000 rwhp, I don't think you'll be reaching its limit.
The one place where the twins will have an advantage is lag. If you install twin turbo's that are the exact equivalent to a single, then the twins will spool quicker because of the much lower overall rotational inertia. It is easier to speed up 2 small wheels rather than 1 big one because of where the mass is in relation to the centerline of the shaft.
Mike
All of the drag racing classes only allow 1 power adder and twin turbo's is considered dual power adders. For this reason, all of the serious guys just use 1.
If you are reaching the limit of the T-76GTS, then it would be beneficial to install a larger T-88 or T-91. In this case, you may not be able to fit a large frame turbo. However, as INTMD8 showed us, you can hide a couple of small ones down low and keep all the accessories. But, with the T-76 proven to 1000 rwhp, I don't think you'll be reaching its limit.
The one place where the twins will have an advantage is lag. If you install twin turbo's that are the exact equivalent to a single, then the twins will spool quicker because of the much lower overall rotational inertia. It is easier to speed up 2 small wheels rather than 1 big one because of where the mass is in relation to the centerline of the shaft.
Mike
Something else you have to take into account is if you spool to quick with a v8 good luck with putting that to the ground. you are already goingto be making decent to good tq numbers, i would opt for a slower spool to get the car moving before theturbo caught up andpassed the natural tq curve. Spool it up too fast and it all goes up in tire smoke.
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Joined: May 2006
Posts: 69
From: jacksonville, fl
Re: Single or Twin Turbo?
I plan on running a single t76 with a 383. I'm not to worried about spooling because it will help with traction. I'm also going to be running methenol injection. It'll let you know what i think of the setup.
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From: Cliffside Park, NJ
Re: Single or Twin Turbo?
Originally Posted by KHShapiro
You beat me to it.
Something else you have to take into account is if you spool to quick with a v8 good luck with putting that to the ground. you are already goingto be making decent to good tq numbers, i would opt for a slower spool to get the car moving before theturbo caught up andpassed the natural tq curve. Spool it up too fast and it all goes up in tire smoke.
Something else you have to take into account is if you spool to quick with a v8 good luck with putting that to the ground. you are already goingto be making decent to good tq numbers, i would opt for a slower spool to get the car moving before theturbo caught up andpassed the natural tq curve. Spool it up too fast and it all goes up in tire smoke.
This car is going to be my ultimate baby. I want it exactly how I want it... if I can't get Twin T72s then obviously I will go with T67s but I want large frame turbos under the hood that will yield me my 1000whp+ with no issues. But if I can hit 1300whp... then so be it. Not saying I will but it's nice to know that it's there. haha
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Joined: Nov 2004
Posts: 1,374
From: Raleigh, NC
Re: Single or Twin Turbo?
Originally Posted by ChrisUlrich
Well... I just like Twins better singles. I also want something ridiculous for Car shows and whatnot. Like Twin T70s or even T72s or something.
This car is going to be my ultimate baby. I want it exactly how I want it... if I can't get Twin T72s then obviously I will go with T67s but I want large frame turbos under the hood that will yield me my 1000whp+ with no issues. But if I can hit 1300whp... then so be it. Not saying I will but it's nice to know that it's there. haha
This car is going to be my ultimate baby. I want it exactly how I want it... if I can't get Twin T72s then obviously I will go with T67s but I want large frame turbos under the hood that will yield me my 1000whp+ with no issues. But if I can hit 1300whp... then so be it. Not saying I will but it's nice to know that it's there. haha
Of course, with 2 T72's would take you till 4000rpm to spool, so you would probably not even know they were on the motor until you really got into it
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Re: Single or Twin Turbo?
Originally Posted by ChrisUlrich
Well... I just like Twins better singles. I also want something ridiculous for Car shows and whatnot. Like Twin T70s or even T72s or something.
This car is going to be my ultimate baby. I want it exactly how I want it... if I can't get Twin T72s then obviously I will go with T67s but I want large frame turbos under the hood that will yield me my 1000whp+ with no issues. But if I can hit 1300whp... then so be it. Not saying I will but it's nice to know that it's there. haha
This car is going to be my ultimate baby. I want it exactly how I want it... if I can't get Twin T72s then obviously I will go with T67s but I want large frame turbos under the hood that will yield me my 1000whp+ with no issues. But if I can hit 1300whp... then so be it. Not saying I will but it's nice to know that it's there. haha
Twins do have that ohh ahhh effect at shows
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Joined: Mar 2002
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From: Baton Rouge, LA, USA
Re: Single or Twin Turbo?
Originally Posted by ChrisUlrich
Well... I just like Twins better singles. I also want something ridiculous for Car shows and whatnot.
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Posts: 54
Re: Single or Twin Turbo?
Not to single you out Chris Ulrich but what is up with people wanting 1000rwhp "street" cars? The idea is just plain stupid, even with supporting drivetrain and suspension mods how much power do you guys think that "street" tires can withstand? At 8+ psi my car wants to go nuts on the street and I have a bulletproof drivetrain, suspension, and slicks! My whole point is that a guy with 400rwhp will walk on you all day if he has traction and your spinning so whats the point of making all this power if its going to go to waste? Now if you plan on running slicks, that isnt really a street application. Make power that you can USE on the "street" if its gonna be a "street" car. thats just my two opinion
p.s try running 150mph trap without a 10 point roll cage, a NHRA certified chassis, a parachute in some classes, and a helmet/gloves/firesuit/fire extinguisher etc...stuff that doesnt equal a street operated vehicle.
p.s try running 150mph trap without a 10 point roll cage, a NHRA certified chassis, a parachute in some classes, and a helmet/gloves/firesuit/fire extinguisher etc...stuff that doesnt equal a street operated vehicle.
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Joined: Feb 2002
Posts: 5,645
From: Bridgewater, MA
Re: Single or Twin Turbo?
Originally Posted by thecareerender
p.s try running 150mph trap without a 10 point roll cage, a NHRA certified chassis, a parachute in some classes, and a helmet/gloves/firesuit/fire extinguisher etc...stuff that doesnt equal a street operated vehicle.
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Joined: Jun 2001
Posts: 822
From: Lawrence, KS, USA
Re: Single or Twin Turbo?
Originally Posted by thecareerender
Now if you plan on running slicks, that isnt really a street application.
Also, keep in mind that many people have their own idea of what a "street" is. For me, ANYTHING you can drive reliably in stop-n-go traffic and drive to the track is a "Street" car, or at least a "street/strip" car. What doesn't classify as a "street" car? If you HAVE TO trailer the thing to the track, I think it's no longer a "street" car...
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Joined: Nov 2004
Posts: 1,374
From: Raleigh, NC
Re: Single or Twin Turbo?
Engine block with completely filled water jacket = not a street car
But other than that I don't see why you couldn't run 1000hp on the street, Jay Leno does it.
I really think the spool time of two big turbos would give you a pretty mild vehicle until you really got into it. Just my opinion though.
But other than that I don't see why you couldn't run 1000hp on the street, Jay Leno does it.
I really think the spool time of two big turbos would give you a pretty mild vehicle until you really got into it. Just my opinion though.