Boostinb20!

Im runnning 2 inch charge pipe for my turbo set up will it make a difference to run 3 inch on there.??????????????????????? let me know if you have results as well.

thatblkguy

Cold or hot side?

what turbo?

nonvtecallmotor

Yes 5" might do the trick.


The details are overwhelming

Schister66

Ideally, you'd like to run charge pipes that are just large enough to support the flow rate of your turbo and engine. If you use something larger than necessary, you'll incur unnecessary lag with minimal gains; however, by running too small, the air in the charge piping becomes turbulent which leads to loss of flow. If you run piping that's too small for your needs, you will hit boost faster, but will not make as much power since the flow of air will be restricted. Here's a good list of air volume vs air speed depending on piping size

<FONT COLOR="blue"><FONT SIZE="5">0.4 mach = 304 MPH</FONT></FONT>

<u>2" piping</u>
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
<FONT COLOR="blue">585 cfm max = 304 mph = 0.40 mach</FONT>


<u>2.25" piping</u>
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
<FONT COLOR="blue">740 cfm max = 304 mph = 0.40 mach</FONT>


<u>2.5" piping</u>
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
<FONT COLOR="blue">913 cfm max = 304 mph = 0.40 mach</FONT>


<u>2.75" piping</u>
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
<FONT COLOR="blue">1100 cfm max = 303 mph = 0.40 mach</FONT>


<u>3.0" piping</u>
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
<FONT COLOR="blue">1300 cfm max= 301 mph = 0.39 mach</FONT>

Boostinb20!

Thanks this thould help I am running a Presicion T3T04GT67 turbo good to about 750 hp at peak boost. my car is running about 500HP right now that is why i was thinking to run a larger charge pipe the current charge pipe on hot and cold side are 2 inches.

Boostinb20!

Both cold and hot side are 2 inch presicion turbo T3T04GT67 the AR is .70