External wastegate question.

[Curt_240]

Ok I just got my 240 and it has a gt2871r .86 turbo with 740cc injectors, but I was thinking about going external wastegate. But I'm unsure as to which one. I'm thinking tial 38mm or maybe 40mm? Idk and what spring combo should I do? Any help would be greatly appreciated thank you.

[Lobo240sx]

Going External is awesome. 38mm should be enough for your size turbo. Weld your internal wg and use the spring you want to boost at. Call Boost Logic 512-371-9960, or any other performance shop and they will tell you what size to use. I got a Precision Turbo 46mm wg for my T3 T70, I got a combination of springs for 15psi. It will go to 16.5 psi running on the gate. Be sure to have your car tuned for higher boost levels.

[badbob2121]

^^i think he covered the basics, im running a very simlilar setup and have been looking into going external myself, PM me and ill shoot you a few helpful links to a few helpful people