Large single vs twins
#1
Large single vs twins
So I am in the planning stages of another build. The ultimate goal would be to drive to the track run a low 9 - high 8 sec pass and drive back home, this will be a streetable car.
I like the fact that twins would spool quicker and have the same top end pull. Its also easier for me to place twins in the engine bay. The simplicity of a large single turbo seems like a plus but it will be a pain to find room for some 100+ mm turbo. What else does a large single have going for it?
This is going into a 84 regal with 11,600 miles on the body. Fully built LSx block @ approx 427 cubes, 4l80E trans, 9" ford rear.
I like the fact that twins would spool quicker and have the same top end pull. Its also easier for me to place twins in the engine bay. The simplicity of a large single turbo seems like a plus but it will be a pain to find room for some 100+ mm turbo. What else does a large single have going for it?
This is going into a 84 regal with 11,600 miles on the body. Fully built LSx block @ approx 427 cubes, 4l80E trans, 9" ford rear.
#2
I don't think that you'll have much problem fitting any of those options in the engine bay. Having said that if you want streetability then I would go with twins. I don't really see any advantages of a large single other than weight (maybe.)
#5
Since this is going to be a street car it would seem to me that it would be much easier to run dual 3.5" pipes out of the engine compartment to the back then a single 5" pipe. These would give you about the same exhaust flow area/cross section.
I'm not sure what kind of muffler you would run with a 5" pipe either.
I'm not sure what kind of muffler you would run with a 5" pipe either.
#6
Since this is going to be a street car it would seem to me that it would be much easier to run dual 3.5" pipes out of the engine compartment to the back then a single 5" pipe. These would give you about the same exhaust flow area/cross section.
I'm not sure what kind of muffler you would run with a 5" pipe either.
I'm not sure what kind of muffler you would run with a 5" pipe either.
witha 5" you can split the 5" pipe into two 3" sections and run them out
#7
If twins spool quicker and have the same top end pull, it sounds to me like they are the better option. However, for a race setup, I've never heard of two smaller turbos being able to spool faster and pull on the top end as well. It's always been a give and take. The twins spooled faster and gave more low end grunt while sacraficing top end pull. Meanwhile, a large single is just the opposite. Hence the reason ti is used for drag racing a road course cars go with twins or a smaller single. What am I getting wrong?
#8
also, consider....you can spool a large turbo just fine on a trans brake, and if you cant get it to start spooling, you can also spray the car to get the turbo to spool.
since this is a drag car, im assuming you are using an automatic and will not have to worry about re-spooling everytime you shift
since this is a drag car, im assuming you are using an automatic and will not have to worry about re-spooling everytime you shift
#9
If twins spool quicker and have the same top end pull, it sounds to me like they are the better option. However, for a race setup, I've never heard of two smaller turbos being able to spool faster and pull on the top end as well. It's always been a give and take. The twins spooled faster and gave more low end grunt while sacraficing top end pull. Meanwhile, a large single is just the opposite. Hence the reason ti is used for drag racing a road course cars go with twins or a smaller single. What am I getting wrong?
#10
I kinda wish I went twins bc its a street car, a T6 is hard to fit.
BUT an 84 regal has tons of room, ive seen a PT106 shoved in with minor hacking.
Jay
#11
Yes the car will be used for drag racing and will have an auto trans. It will be a street car and i dont want to have to hack it up tooo bad. Im still unsure about that whole twins will spool faster and have the same top end busniess.
#13
head to theturboforums.com several over there have pt106's
that or on yellowbullet.com
also with twins, you have twice as much piping, two wastegates, etc, costs go up VERY quickly
what are your goals for the car that you NEED a 106?
that or on yellowbullet.com
also with twins, you have twice as much piping, two wastegates, etc, costs go up VERY quickly
what are your goals for the car that you NEED a 106?
#14
#15