JelmerPatrol Posted February 8, 2017 Share Posted February 8, 2017 I'm in the proccess of building a L28 turbo for my 4500 pound Patrol. Since it is suchs a heavy beast I need as much low down torque as possible so this is what i'm thinking of/what i already have: JDM L28 block US Flat top pistons US P90 head Euro turbo exhaust manifold JDM RB20DET turbocharger I also have 3 intake manfolds: US turbo intake with bigger TB US N/A intake JDM NAPS intake with the twin butterfly TB Which intake would be best to use for me? I think the NAPS because it has one small butterfly which opens first and one bigger butterfly which opens later. IMG_20170204_140748849 by Jelmer Eppinga, on Flickr IMG_20170204_140730491 by Jelmer Eppinga, on Flickr IMG_20170204_140351061 by Jelmer Eppinga, on Flickr IMG_20170204_140327120 by Jelmer Eppinga, on Flickr Quote Link to comment Share on other sites More sharing options...
Tony D Posted February 8, 2017 Share Posted February 8, 2017 I wouldn't bother with the twin plate... all it does it give you resolution. At about 3/4 throttle, the secondary plate will start to open and go from full closed to full open in the last 26% of pedal travel. That likely will not coincide with when boost comes on, so that small plate will act as a big restriction to the incoming flow from the turbo... The thing to consider is the runner length, really. the P65 has those runners that are long like a diesel intake, and were used on the heavier Cedric, Gloria, and Leopard Sedans.Coupes. THAT would be the one to run. With the single big plate. The throttle body fits on any of the intakes, you will see all the intakes have the teardrop shape to accomodate the upper small throttle plate. That TB can be retrofit easily with any of the single plate units. A 50 mm body will work fine. if you use a larger 60mm plate, I'd recommend non-linear throttle quadrant and cable throttle application to modulate the tip-in better in a slippery or muddy condition. Quote Link to comment Share on other sites More sharing options...
Tony D Posted February 8, 2017 Share Posted February 8, 2017 which one do you have BTW, the L28 or L20E dual plate body? In US terms, the primary body is around the size of a Dime on the L20E and the size of a Nickel for an L28E... Maybe 15mm vs 25mm? Total flow in both cases is equivalent to the single 50 used on the other intakes. they TBs as stated are completely interchangeable. Quote Link to comment Share on other sites More sharing options...
JelmerPatrol Posted February 8, 2017 Author Share Posted February 8, 2017 It the L28 one. Block/head combo was N42/N42. It will be cable operated, that is how I made my current TB from a 280ZX too. (Patrol comes with a single carb from factory and F54/N42 block/head combo) So it would be better to swap to the stock 50mm TB than. P65 would be nice but it has to come from Japan. Quote Link to comment Share on other sites More sharing options...
JelmerPatrol Posted February 10, 2017 Author Share Posted February 10, 2017 This is the twin plate TB: And a not so good to see picture of how I have the cable hooked up now: Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted February 10, 2017 Share Posted February 10, 2017 Envy that Euro exhaust manifold... Quote Link to comment Share on other sites More sharing options...
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