MONZTER

Hi Tony, Ya I would like to look at those plenums. I could reverse engineer it in Pro-Engineer so that it could be run on CFD software, but I can't speak for TurboBlueStreak if he will run the simulation or not:icon43:. Maybe after the new year we can get together and check it out. Thanks for the offer. Jeff

Hey Braap, Thanks for your comments, Unfortunately I don't know the answer, I'm just working from what just looks and feels like it would work properly. Helix posted a link above from somebody else doing the same type of design for a 4 cylinder. He had the slot facing the runners forcing the air down them. He determined this to cause turbulence in the runner and moved it to the middle like I have shown. I guess the best answer is lots of R&D to find out. Jeff

Like this, It scares me!!!

TurboBlueStreak was kind enough to help out with the CFD work on this new plenum Thanks. I made some changes to the model before sending it to him. Mainly, I lengthened the slot from the lower plenum to the upper plenum. The slot now goes full length. I also modeled the rest of the intake track. You can see the throttle bodies, and how they taper down to where the flange meets the head ports. I also added the throttle shafts and butterflies to see the effect. Here are some pictures of the latest design. Here are the CFD results: I can see from the results the radius going into the begining of the slot is too sharp, making it difficult for the air to get around the corner. I will modify it like this picture. I am no expert at reading the CFD results, but it looks pretty consistent down each runner. I also find it interesting how the velocity increases down the runners due to the taper. Anybody have comments Thanks again to TurboBlueStreak Best Regards, Jeff

Tony, Your 100% correct. The TWM spacing I used is standard mounting for all the universal manifolds out there. So really this thing could bolt up to any throttle body mounted to and triple style manifold. I should be getting some CFD results soon; we'll se how it looks. Jeff

I'm not sure yet. The first one will be CNC machined in to halves and then welded together for testing. I am designing it with casting in mind. The first one is going to be pretty expensive, as it will be out of a big chunk of metal. If I cast them, I would probably make the casting patterns off the CNC prototype. I guess I will have to look into the expense for casting them. I dont know how many people would want a turbo manifold designed to work only with TWM throttle bodies. Thanks Jeff

Hey Guys, Don't know if this helps or not, but here is what I did to increase the offset and strength of the rear of my 240. I got some rear control arms from a 85 300zx turbo, stubs and companion flanges. The bearing hub on this arm is welded on to the control arm. I cut the bearing hub off and cleaned up the left over welds making the OD of the hub concentric with the ID. So now I have a perfect set of bearing hubs. Next I took my 240 strut and removed the strut tube from it leaving only the casting (so it will fit in my lathe). I chucked this up in the lath and cleaned the ID of the casting. The ID of the casting is now exactly the correct size of the OD for the 300ZX hub. I then pressed fit the hub into the 240 strut casting and then welded around it with 309 stainless. So now the 240 strut uses 300zx turbo stub axle, bearings, companion flanges, CV axles and my offset is +20 mm to work perfectly with 40 offset wheels and no spacers. I hope this make sense? Here are some pictures, and some numbers. Click on the pictures to go to my gallery for more more and bigger views. Jeff