{"id":4380,"date":"2013-02-09T00:40:30","date_gmt":"2013-02-09T08:40:30","guid":{"rendered":"http:\/\/grandmighty.com\/?p=4380"},"modified":"2013-03-04T19:52:06","modified_gmt":"2013-03-05T03:52:06","slug":"a-spec-precision-5866-twin-scrollsingle-turbo-kit","status":"publish","type":"post","link":"http:\/\/grandmighty.com\/2013\/02\/a-spec-precision-5866-twin-scrollsingle-turbo-kit\/","title":{"rendered":"A-Spec Precision 5866 Twin-Scroll Single Turbo Kit"},"content":{"rendered":"
I realize I never formally introduced or addressed what exactly<\/em> it was I wanted to do with the engine – and that is go single turbo. That’s because up until now, I’ve primarily been preoccupied with waiting for the related parts to finalize and arrive in my hands. <\/p>\n Even if an individual does not turn a single wrench and is merely a credit card warrior, this still should not be seen under a trivial light. The fact is, even the task of picking and choosing what parts to buy takes skill and guile. This is compounded when you’re dealing with a more obscure car, as the options are more limited and require greater assessments. <\/p>\n For me, I wanted the best single turbo kit I could get for this car. One of the paths I could have chosen was to go with a Full Race manifold and then piece together the rest of the kit; however, I wasn’t too intrigued by their long-runner design. My priority is to maximize responsiveness and not necessarily power output. In the end, I decided to go with A-Spec Tuning<\/a> from Chicago because they specifically offer a revised short-runner manifold. Additionally, their long history with RX-7’s and quality build materials have established a bit of a cult following. <\/p>\n There was, of course, a stipulation. As much as A-spec is known for their quality, they are just as known for the amount of time it takes to deliver a kit. This ended up being no exception for me… <\/p>\n I got the jump on this single turbo project early, and placed my order back in October. My manifold was supposedly already made at the time, but it wasn’t until mid-January that I received my first package. The turbo came separately about a week later. Then I discovered that I was given Precision wastegates when I ordered Tials… so that took a couple more weeks to sort out. Furthermore, the dump pipes were forgotten from my package and dragged out the waiting even longer. <\/p>\n While the experience was quite taxing and wearying, because a lot of money and time was on the line, it was a necessary deed. I like to anecdotally reference the Soup Nazi from Seinfeld… somewhat similar. <\/p>\n With patience and perseverance comes great rewards, and in this case, it came in the form of extreme turbo porno. A-Spec did eventually come through and deliver me my full kit. <\/p>\n Here is the ceramic-coated twin-scroll manifold with a divided T4 flange.<\/p>\n <\/a><\/p>\n And the main show – I went with a state-of-the-art double ceramic ball bearing Precision 5866 turbo with CNC billet CEA compressor wheel. <\/p>\n <\/a><\/p>\n <\/a><\/p>\n <\/a><\/p>\n The 5866 itself is an interesting setup and A-Spec helped recommend this to me to achieve my response goals. In comparison to a Garrett GT35R, the 5866 has a larger turbine but a smaller compressor. It is basically a hybrid of a 5876 compressor with a 7666 turbine. <\/p>\n For the wastegates, I opted to go all-out in this department. I am simply sick of boost creep issues with RX-7’s. On the stock sequentials, all it potentially takes is a removal of the catalytic converter to be stuck with uncontrollable boost. This didn’t exactly imbue a sense of confidence, I felt like the car was a time bomb and I never wanted to boost too much. Not the way a car should be driven. <\/p>\n To back my intentions of ridding this problem, I embodied the solution in a pair of 44mm Tial MV-R’s. <\/p>\n <\/a><\/p>\n Lastly, here are the long-awaited dump pipes. The larger one fit well but the smaller one was way too short. It hung above the subframe when mounted, so I went to FFTEC<\/a> and had them extend it 4″. <\/p>\n