FMuscle Posted January 23, 2016 Share Posted January 23, 2016 I was just looking at universal TB for my build, how should I choose the size of it?My pod filter is 3 inches/75mm, from there I have about 10 inches to the S/C 2.5"/60mm inlet, in which space I have to fit the TB and a bypass pipe, then once blown the air goes through the 2.5"/63mm FMIC, then to the corolla inlet which has a 2"/51mm opening.My stock/current TB is 46mm in diameter. Already a restriction to the 51mm inlet. But since it's not going in the stock location, a 50mm throttle body is out. But should I get a 60mm to match the S/C inlet, or a 75mm to match the pod?My theory to have the TB at 60mm fixed to the S/C and engine, with a silicone reducer to the pod. But I could be wrong. Here's a highly detailed 3D model of my future setup. Quote Link to post Share on other sites
5e colin Posted January 23, 2016 Share Posted January 23, 2016 i sugest to use same size tb as your piping intercooler piping is you could use the stock 4efte 1 at 50mm i would keep pipes as small as possible without restricting Quote Link to post Share on other sites
FMuscle Posted January 24, 2016 Author Share Posted January 24, 2016 It's 2.5 from the S/C to the IC. I have a reducer after the IC to 2.0 to match the rolla inlet. I guess I'm going with a 60mm TB.Even if there's a bit of variation (60-63mm) 2.5in seems alright.I think I'll need to add poly mounts to reduce movement on such a short pipe... pod to s/c Quote Link to post Share on other sites
Stu Posted January 25, 2016 Share Posted January 25, 2016 60-65mm is a good size. Ive had a few 4e's through with 75+mm units and they often have decel to idle stall issues especially with custom inlets with small plenums (these have had aftermarket ecu's by the way). You can tune a decent size idle bypass solenoid to avoid the issue though but takes some time. Quote Link to post Share on other sites
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