External wastegate question.

General discussion forum about the 240sx, and a great place to introduce yourself to the board!
Curt_240
Posts: 1
Joined: Sat Sep 03, 2011 10:13 am
Car: 1991 sr20 fararri red 240 coupe

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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.


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Lobo240sx
Posts: 779
Joined: Wed Dec 01, 2010 7:39 am
Car: 1991 Nissan 240sx Coupe SR2.35DET Redtop Build
Location: Austin, Texas USA

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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.

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badbob2121
Posts: 1989
Joined: Sat Jan 16, 2010 9:23 am
Car: '92 Nissan 240SXS13 Hatch ELLIS JUAN
'12 Ford Mustang GT RTR
Location: St. Louis

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^^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


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