Tobin's 1987 Turbo 7MGTE 4runner

Next thing you know, the motor is back on the ground, and later that night, replaced by a 7MGTE.
No intercooler at first, but soon will be a MKIV side mount intercooler. Turbo has been upgreded to a 60-1 compressor wheel to be able to push 500+hp. Later will come fuel injectors, lexus AFM, and increased boost, but for now, he is running stock boost.

I tried a little different design on the exhaust. The CT-26 turbo share the same chamber for the turbine and the wasgate. When the wastegate opens, the gases will interfere with the gasses of the turbine, causing turbulance, and more exhuast gases for the same space which may be a restriction. I designed a turbo flange that seperates the two chambers, and runs a seperate 1 1/2" exhuast pipe to vent to the atmosphere just below the motor.

With this design, the turbine gases run through a large 3" exhaust, with a cat and chambered muffler to help keep the stock exhuast sound. Under normal driving conditions, the truck is very quiet. No one would suspect, until you hit full boost, and the wastegate opens up.

After getting the now turbo engine in, some things had to be changed, like a 3" exhaust. We decided to do something that hadn't been done before. That is, split the turbine and wasgate gasses, and vent the wastgate gasses to the atmosphere. At the time, nobody had done this before with the stock supra turbo, but after I had posted my design, other companies started to produce such a thing. Oh well.

Custom turbo elbow with external vent

Anyway, venting to the atmosphere turned out to be a bad idea. Without a electronic boost controller, the wasgate will creap open, and is quite noisy, even at low boost applications. This was later changed, and the gasses were dumped back into the downpipe, a little further down. When I make my exhausts, I usually always use a 3" tailpipe from a local exhaust shop. This will contain several mandrel bends on this single pipe, and can be picked up for around $60 each.

Vent for wastgate - made cover for emission purposes

There will be more to follow, more pictures, and more swap info.

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