throttle body 3" but turbo piping is only 2.5" :(

[98blackgsr]

Ok, so I bought a 70mm throttle body then bored out my victor x to 70mm intake but !then I mocked up my turbo setup and my piping is only 2.5" but the throttle body is 3". I know that more air makes more power but is there a place that sells 3" turbo piping? Is it really that big of a deal if I just get a 3" to 2.5" reduce? Need opinions please, thanks!

 

[Jvest]

what kind of power are you trying to make?

if you wanna see the mathematical mumbo jumbo here ya go


[+] | [-]Charge piping size formula
LB to CFM Conversion Example:
50lb/min x 14.27 = 713.5 CFM
or
80lb/min x 14.27 = 1141.6 CFM
_______
The velocities are in miles per hour and mach, and the flow rates are in cfm. Measurements for the piping are in inches.

0.4 mach = 304 MPH

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

 

[98blackgsr]

im trying to make around 475 and i have no idea what any of that means. lol, thanks for looking it all up tho!

so who sells 3" intercooler piping? i've looked on google and found sites that sell pipe with intercoolers, or ebay who sells universal but im new at the whole turbo thing and dont know what pieces i need or could use. all of them look the same and none of them look like the one i have:???:..........

 

[Jabes]

these guys might have it, http://www.go-autoworks-store.com/go94incuraki.html give them a call, easy to deal with and makes good piping

 

[MrGurley]

imo you dont need 3 inch charge pipes, your going to have crazy spike/holding boost issues. you can make plenty of power with 2.5inch piping with no issue

 

[Jvest]

imo you dont need 3 inch charge pipes, your going to have crazy spike/holding boost issues. you can make plenty of power with 2.5inch piping with no issue

this is what i was thinking.
i wouldnt think unless your throwing down ~600 whp that it would be an issue.

 

[AlexD]

leave the piping how it is and run a transition coupler.

 

[98blackgsr]

ok, thanks guys. bought a coupler today, should be here next week or two cause its coming from japan....... i should really read things before i click buy :roll: