Alcoholic twins
Here's a couple more pictures of the passenger side header and the twin stock cores welded together. The outlet of the I/C shares a common plenum. Yes, it would have been easier to use a single 70mm TB, but I started this project after listening to the "experts" at the track that tell me that their "Cousins, uncles, neighbors, friend has one of these...........But, it's TWIN TURBO!....came that way from the factory!"
I was tinkering in the shop one night and remember seeing a similiar lay-out from Duttweiler many years ago, and thought Heck......I think I can make this a "bolt on deal". Yes, this will bolt on to ANY turbo regal, with no modification to the car except to drill two holes in the core support to hang the intercoolers. I could easily change the IC bracket to pick-up existing holes, that would make this a complete bolt on deal. Another reason for twin TB's is that I wanted to increase the plenum volume, and a single TB would look "lonely" on that big box. The stock dog house is WAY too small for a turbo engine. My research determined that the plenum needs to be about 2.75 times engine displacement. I also wanted to narrow the entrance to the lower manifold to get the air closer to the center of the manifold. Because I had to raise the plenum to clear the fuel rails I just incorporated the .750" thick spacer as my alcohol injector plate. There are 6 nozzles in the plenum spacer pointing down each runner. They are the smallest I could find at .014". I had to use a alcohol/nitro compatible NOS valve to prevent the engine from sucking alcohol when not under boost. My intention is to lean the fuel out at high boost and run mainly on methanol. It'll take me awhile to slowly tune this contraption. This "project" is just an engineering deal that keeps my mind busy. I have been building these cars for nearly 18 years now and just wanted to do something different. I'm not trying to set records or anything, and really didn't spend much building it. I have a TON of time in it, but it was alot of fun engineering and building it. I did all the work in my garage. (except for the milling of the plenum face and mounting surface after welding.) I had a buch of 321 stainless laying around and figured I would put it to good use. It doesn't weight much more that aluminum (it's .016 wall) and it'll never corrode. There's about $3,000 in stainless steel on this car, but what the heck, it looks cool
I had to use stainless for the lower radiator hose because it runs too close to the header. If I have problems with the header cracking, Ill build one out of 321 in the future. I also used the stock exhaust elbows to save a little time, and to keep the "stock appearing" theme. I tried to make it look like the factory would have done, but the intercoolers were posing a bit of a problem "stacking" them behind the radiator, so I had to go front mount. Years ago I welded two cores together behind the radiator, but I had to cut up the core support and install the fan in front of the radiator, and I didn't want to do that on this project. I might be able to use the new Precision stock location IC now but that wasn't available when I started this project. I have alot of pictures of the build process if you would like to see a particular thing let me know and I'll try and post it.
