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1999 S80 T6 Power Flattens Around 4500-5000 Rpm


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Hi my 99 t6 accelerates very fast off the line and up to 4500-5000rpm, then it seems to flatten out is that normal? I thought the second turbo is supposed to work at higher rpm. I have new plugs and all cylinders are firing fine with no faulty codes.

Any suggestions?

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Well.. The turbo's on the T6 are tiny. I mean microscopic tiny, so running out of "breath" at higher RPM's would be completely normal.

Also, the turbos aren't in sequence, like a MK IV Supra or something. Each bank has it's own turbo, so cylinders 1-3 and 4-6 each have their own. Hence the reason why they are so small.

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