Is the only difference between a TT and a T set-up.....
Launching!
Joined: Jan 2002
Posts: 275
Likes: 0
From: Bardonia, NY
Originally Posted by gametech
Strictly from a physics standpoint, it is always going to be possible to make twins boost earlier than a single at the same peak flow and efficiency ratings.
Thread Starter
TECH Veteran
Joined: Dec 2001
Posts: 4,117
Likes: 0
From: Ft. Lauderdale, FL, USA
Originally Posted by Project GatTagO
Thank you for clarifying my point in a much more tacktful manner.
Andrew
Andrew
When I post a question I expect answers or any info that can reach an answer, not "the question kills me"..."get a grip"..."the car will be undriveable on the street".
What kind of reply did you expect?
.
Thread Starter
TECH Veteran
Joined: Dec 2001
Posts: 4,117
Likes: 0
From: Ft. Lauderdale, FL, USA
Well, I guess the single turbo is the way to go for me anyway. With the big cubes the turbo should spool very soon and be more controllable throuhgout the rpm range.
.
.
.
.
TECH Regular
Joined: Nov 2001
Posts: 409
Likes: 0
Originally Posted by XJGPN
Not true. The logic behind this "theory" is that it is easier to spin up the "smaller" turbo than it is to spin up the larger turbo. The truth is that you have 8 cylinders spinning the one large turbo vs. 4 cylinders spinning up each of the 2 in a twin setup (on an 8 obviously). There have been companies that have done experiments trying to go with fully optimized twin setups and single setups to compare lag, and I have yet to see a company beat out a single setup with a comparable twin setup. Fact of the matter is that the most important factor with determining spool is the turbo... both matching the turbo to the setup and just the technology within the turbo. The second most important factor is the "layout." Cast manifolds vs. tubular, log vs. header style, size of primaries, size of intake piping, size of intercooler. The single vs. twin debate relative to spool really is so insignificant that it really isn't even worth mentioning... especially since where your particular engine maps out at would make it switch back and forth depending on which twins would feed it properly vs. which single. On turbo engines, managing heat really is the main thing you should be worrying about… All this talk of single vs. twin is really misplaced attention. Make that decision based on what “fits” the engine bay better… Not based on spool characteristics.
TECH Enthusiast
iTrader: (27)
Joined: Aug 2005
Posts: 741
Likes: 0
From: Anheuser Busch, Houston Texas
Hey I have a related yet slightly stupid question I would like to have clarified.
I know when you are looking at engine demand on airflow, if you have two turbos, they can each do half the work (assuming correct sizing) to make the engine need. So if you need 50lb/min, two that make 25 will do.
But is PSI cumulative, the higher of the two (for the sake of argument, say they were different) or the same (eg turbo 1 10psi and turbo 2 10psi = 10psi)?
In other words one turbo at 12 psi is 12psi, but are two at 6 = 12 or 6?
Coming back to the original question, how does that effect power generation at lower rpms, as someone else mentioned?
I know when you are looking at engine demand on airflow, if you have two turbos, they can each do half the work (assuming correct sizing) to make the engine need. So if you need 50lb/min, two that make 25 will do.
But is PSI cumulative, the higher of the two (for the sake of argument, say they were different) or the same (eg turbo 1 10psi and turbo 2 10psi = 10psi)?
In other words one turbo at 12 psi is 12psi, but are two at 6 = 12 or 6?
Coming back to the original question, how does that effect power generation at lower rpms, as someone else mentioned?
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
I'll tell you something about my TT setup quicken, if you want wheelspin off the line boost will do it in a single or twin setup on a TH400 setup and a descent converter. I will be very happy again when I can hook up enough to get full boost in 1'st gear
Lyle, a big single will have more backpressure than twins at the same target power level. Look at it this way, (2) three inch holes flow more than (1) five inch hole. But you can make 1500 hp with either setup. My guess is that the spool time of a big single will be noticeably slower than twins, but we'll see.
Originally Posted by Pro Stock John
Lyle, a big single will have more backpressure than twins at the same target power level. Look at it this way, (2) three inch holes flow more than (1) five inch hole. But you can make 1500 hp with either setup. My guess is that the spool time of a big single will be noticeably slower than twins, but we'll see.
one 5" hole flows more then two 3" holes
Pi R^2 dont you remember from geometery class
a 5" pipe is 19.63 square inches (least on the outside diameter you have to subtract wall thickness but we will ignore that)
a 3" pipe is 7.07 square inches multiply that by two and its 14.14 square inches
So the 5" pipe has better flow amount, not to mention the friction of the added walls going through two pipes, but you might not know that unless you took fluids.
one 4.5" pipe = two 3" pipes (not counting the friction of the walls of the pipe)
Originally Posted by smokinHawk
HOld ON JohN!
one 5" hole flows more then two 3" holes
Pi R^2 dont you remember from geometery class
a 5" pipe is 19.63 square inches (least on the outside diameter you have to subtract wall thickness but we will ignore that)
a 3" pipe is 7.07 square inches multiply that by two and its 14.14 square inches
So the 5" pipe has better flow amount, not to mention the friction of the added walls going through two pipes, but you might not know that unless you took fluids.
one 4.5" pipe = two 3" pipes (not counting the friction of the walls of the pipe)
one 5" hole flows more then two 3" holes
Pi R^2 dont you remember from geometery class
a 5" pipe is 19.63 square inches (least on the outside diameter you have to subtract wall thickness but we will ignore that)
a 3" pipe is 7.07 square inches multiply that by two and its 14.14 square inches
So the 5" pipe has better flow amount, not to mention the friction of the added walls going through two pipes, but you might not know that unless you took fluids.
one 4.5" pipe = two 3" pipes (not counting the friction of the walls of the pipe)
7 Second Club
iTrader: (5)
Joined: Jan 2003
Posts: 2,064
Likes: 0
From: Grove City Ohio/Port Washington L.I sometimes
Originally Posted by turbocuda
I wouldn't pose like that!
Lyle,stop talking about it and do it.
Hope you budget for all the supporting hardware you're going to need.
Originally Posted by turbocuda
I wouldn't pose like that!
i'm planning on running a procharger on it this year but we'll see what happens after i finish the camarslow
Thread Starter
TECH Veteran
Joined: Dec 2001
Posts: 4,117
Likes: 0
From: Ft. Lauderdale, FL, USA
Originally Posted by Boostaholic
I'll tell you something about my TT setup quicken, if you want wheelspin off the line boost will do it in a single or twin setup on a TH400 setup and a descent converter. I will be very happy again when I can hook up enough to get full boost in 1'st gear
Since a 1,500 RWHP set-up can't be nailed to the floor off the line, I'm just wondering if a single turbo will be all over the place off the line. Or if I want to take off as fast as possible without wheelspin, will it reach a point where the boost will just pound the engine and the wheels will spin.
A big stroker like a 427 should have enough torque off the line, but it would suck if it reached a certain rpm and just blows the tires off uncontrollably. I'd hate to have a single turbo setup built and this be the characteristics. It would get sold.
.
TECH Enthusiast
iTrader: (27)
Joined: Aug 2005
Posts: 741
Likes: 0
From: Anheuser Busch, Houston Texas
Woo for a big orange engine. I have one in my garage but I am too lazy to put in my mopar. Great looking car.
and wouldnt a smaller cross section pipe fill up faster (assuming again correctly sized turbos), and therefore lead to faster spooling?
and wouldnt a smaller cross section pipe fill up faster (assuming again correctly sized turbos), and therefore lead to faster spooling?
Staging Lane
Joined: Jul 2004
Posts: 62
Likes: 0
Moparnos, here is a vid from when I first put the injection on....Slipping going into high gear and fuel issues laying over in high gear...
http://www.boostdoctor.com/clips/brian680.wmv
http://www.boostdoctor.com/clips/brian680.wmv
Originally Posted by Pro Stock John
My guess is that the spool time of a big single will be noticeably slower than twins, but we'll see.
I think 2 twins might spool slower. Half the exhaust flow to each twin.
Originally Posted by Quickin
I don't want wheel spin off the line, or anywhere else. I'm just used to having raw N/A power ~500/500 off the line and it's instant, and smooth power when it comes in, easily controlled all the way through every gear.
Since a 1,500 RWHP set-up can't be nailed to the floor off the line, I'm just wondering if a single turbo will be all over the place off the line. Or if I want to take off as fast as possible without wheelspin, will it reach a point where the boost will just pound the engine and the wheels will spin.
A big stroker like a 427 should have enough torque off the line, but it would suck if it reached a certain rpm and just blows the tires off uncontrollably. I'd hate to have a single turbo setup built and this be the characteristics. It would get sold.
.
Since a 1,500 RWHP set-up can't be nailed to the floor off the line, I'm just wondering if a single turbo will be all over the place off the line. Or if I want to take off as fast as possible without wheelspin, will it reach a point where the boost will just pound the engine and the wheels will spin.
A big stroker like a 427 should have enough torque off the line, but it would suck if it reached a certain rpm and just blows the tires off uncontrollably. I'd hate to have a single turbo setup built and this be the characteristics. It would get sold.
.
I also see how you got bored of the 500hp.That is a normal # around this area. When you do 800-900rwhp you will think the car is slow then too after you get use to it
