Thread: Turbo Question
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Herr-Kuhn Herr-Kuhn is offline
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Join Date: Aug 2006
Location: Cincinnati, Ohio
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This would work, but expect some heat loss in the cross over tube. A lot of people claim twins are not necessary and that you can just rear bumper mount a single and get the same results. Not true. A single front mount with cross over tube would probably work pretty well though.

If you did something like this the exhaust back pressures would not be totally equal, but I don't think it would be a big problem.

Nothing wrong with a proper single setup, just make sure you mount it close enough to the heads to take advantage of all the heat energy in the exhaust. Remember, the 300-400F drop across the turbine wheel is energy that was given up and put into powering the compressor. A lot of poeple think the TC is just a "fan" in the exhaust stream. It is far more than that...it is a gas turbine and works on a pressure and temperature differential. A thermodynamic pump if you will. Both are essential for maximum performance. The sharp and hot pulse energy is essential for maximum kick. If you can keep the pulses in-tact until they reach the turbine wheel, then you have done a super job. Just remember, headers sag and crack and also lose a lot of heat. Designing a TC exhaust manifold system is a complex design and fabrication exercise that will test your patience. Log style manifolds, if designed properly, can nearly match the top end performance of a header and can make boost earlier...it is a better "averaged" manifold that you can live with day to day.

The turbocharged engine is not nearly as sentive to manifold changes as a NA car would be. I've seen terribly crude looking manifolds put out huge power levels.
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Big Gun: 1988 928S4 Twin Turbo, 5-SPD/LSD 572 RWHP, 579 RW ft-lbs, 12 psig manifold pressure. Stock Internals, 93 octane.
Little Gun: 1981 928 Competition Package Twin Turbo, 375 RWHP, 415 RW ft-lbs, 10psig manifold pressure. Nikasil Block, JE2618 Pistons, 93 octane.
Old 04-04-2007, 09:12 AM
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