MONZTER

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

I got all my parts from Motorsport Auto (MSA) Sal ordered them for me. He had a hard time finding the inner pinion bearing. I would not do it again, don’t think I gained anything from doing it except learning what a pain in the #$%$^ it was. I was installing a Quaiffe which doesn’t fit back into the diff housing with the side bearings installed. You have to press them on through the side holes. You then check the pinion height to find out it needs adjustment, how do you get the side bearings back off to remove the diff and get the pinion back out to shim it? Many hours of work that’s how. I had to make a special puller. Learn from our mistakes, don’t fix what ain’t broke. Good Luck

It IS in the Factory Service Manual FSM Thats what I used

Well good news, A very generous person on this forum has agreed to do some CFD on this plenum design. I also met with my machinist friend, and priced out the material. He said I could run the part on his brand new Fadal 60x30 CNC. This is great news and it seems like it is going to be a go for me to build one and test it out. Thanks Jeff