cham

Ive been working on my tiburon for a bit now done a few mods, but i just got a new job and another car to drive so i can start to REALLY tinker with the tiburon. I was looking at going to a turbo but i am trying to plan my build, i already have most of the exhaust all planned out im just working on my intake,

When i go to buy a turbo (really soon) im going to get a super 60 as far as i know the diamater of the pipe going out of the intercooler to the intake is 2 inch for a super 60. 2 inchs in mm is 50.8mm and stock TB size is 53mm i was thinking of matching my intake piping, to the same as my throttle body and on the manofild to yield direct air flow with no restriction, which i think would be the optimal thing to do, but my question is if the stock throttle body is already bigger than the pipe coming off the intercooler would a bigger throttle body do me any good at all? my goal for boost is only 14 pounds so i don't plan on buying a bigger turbo or anything like that so its not like i will eventually have a big enough turbo for a 3 inch pipe to yield from a BBTB maybe a bigger throttle body still has a major benafit even though the intake piping is alot smaller than the TB if it does can you please explain.



**topic title changed because thread is mostly regarding piping sizes. -tanc

HyundaiKitCoupe

hm. i would say yes to anytime because of better and more aggressive more precise engine response. if you're boosting though and are just looking for power, not really needed, just concentrate on putting everything together and making it work.

UrS0NvS

more power needs more air and fuel. i suppose you can go with a wee little turbo, but why?

Ericy321

From the turbo you will likely go from 2" to 2.5". The Intercooler will be 2.5 along with the rest of your piping unless you want to do 2" piping. So my answer is yes.

tanc

This whole thread fails. I can clearly see you haven't researched any of this. Go buy maximum boost by corky bell, read it, learn it, live by it.

1st. Planning your turbo build but you start with exhaust and intake? You have bigger problems than that. Engine management,map?,fuel injector size?fuel pump? spark control?etc

2nd.


Wtf does that mean? hot side piping will be 2"? You mean the super60 compressor discharge is 2"?

Btw the intake in a turbo vehicle is the compressor inlet don't confuse it with the intake on a naturally aspirated vehicle.

3rd. When you give a goal for the vehicle, you don't talk in psi, you talk in whp. Turbo's very significantly in size, a gt40 at 14 psi is night and day compared to a 13b at 14psi. All engines are also tuned differently, transfer power differently as well. No one running 14psi on a super60 is going to have the same power as you. So...whats your whp goal?

4th. Do you know any fluid/air dynamics? Have you done any air flow calculations taking into effect pressure drop, temp, turbulent flow regimes, bends, pipe length, diameter..etc. When calculating pipe size you have to keep that in mind to know if your piping diameter/length/radius will restrict your whp goals. To big and your mach is to high which equals high turbulence, high back pressure. To little, and you lose velocity.

Look at the size of the turbo in CFM, than compare it to this chart. A honda friend and I worked on this chart doing formulas for a week calculating these numbers. Its not PERFECT, but close. You want to stay in the .25 mach area for the most optimum velocity/mach ratio. If your using 2" piping make sure your turbo isnt rated for higher than 400 cfm or you run into more turbulence. Also, keep in mind these numbers are calculated at relatively mid elevation, temperature factors eliminated, plus bends in the piping/radius of the bends are not calculated either. More bends, use bigger pipe than whats rated for.

This is SPOON FEEDING, and think this info might help a lot of people just guessing exhaust size/cold piping size. YOU still need to do a lot more research.

Air Flow vs Pipe Diameter
Air turbulence and back pressure increases per after .25 mach depending on the piping size.
Lower mach, lower air velocity in NA motors
2" piping
1.57 x 2 = 3.14 sq in
300 cfm = 156 mph = 0.20 mach
400 cfm = 208 mph = 0.27 mach
500 cfm = 261 mph = 0.34 mach
585 cfm max = 304 mph = 0.40 mach


2.25" piping
3.9740625 sq in = 1.98703125 x 2
300 cfm = 123 mph = 0.16 mach
400 cfm = 164 mph = 0.21 mach
500 cfm = 205 mph = 0.26 mach
600 cfm = 247 mph = 0.32 mach
700 cfm = 288 mph = 0.37 mach
740 cfm max = 304 mph = 0.40 mach


2.5" piping
4.90625 sq in = 2.453125 x 2
300 cfm = 100 mph = 0.13 mach
400 cfm = 133 mph = 0.17 mach
500 cfm = 166 mph = 0.21 mach
600 cfm = 200 mph = 0.26 mach
700 cfm = 233 mph = 0.30 mach
800 cfm = 266 mph = 0.34 mach
900 cfm = 300 mph = 0.39 mach
913 cfm max = 304 mph = 0.40 mach


2.75" piping
5.9365625 sq in = 2.96828125 x 2
300 cfm = 82 mph = 0.10 mach
400 cfm = 110 mph = 0.14 mach
500 cfm = 137 mph = 0.17 mach
600 cfm = 165 mph = 0.21 mach
700 cfm = 192 mph = 0.25 mach
800 cfm = 220 mph = 0.28 mach
900 cfm = 248 mph = 0.32 mach
1000 cfm = 275 mph = 0.36 mach
1100 cfm max = 303 mph = 0.40 mach


3.0" piping
7.065 sq in = 3.5325 x 2
300 cfm = 69 mph = 0.09 mach
400 cfm = 92 mph = 0.12 mach
500 cfm = 115 mph = 0.15 mach
600 cfm = 138 mph = 0.18 mach
700 cfm = 162 mph = 0.21 mach
800 cfm = 185 mph = 0.24 mach
900 cfm = 208 mph = 0.27 mach
1000 cfm = 231 mph = 0.30 mach
1100 cfm = 254 cfm = 0.33 mach
1200 cfm = 277 mph = 0.36 mach
1300 cfm max= 301 mph = 0.39 mach
Exhaust piping, a good measure is 2.2CFM per hp and 115CFM per square inch.
3” pipe example
115 x 7.065 = 812
812/2.2 = 370ish