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Message: [QUOTE="Powersmoker, post: 32041, member: 124"] S480/83 T4 1.25 a/r. 42psi Boost / 42psi Drive Pressure. Two .080 Jets brings boost up to 60psi and drive pressure to 75psi. Gates were set to barely open. (This setup ran the 10.55 @ 129mph) Basically, you could run this turbo with nos and would not need any wastegating......but it would have to be strictly used for nitrous. This turbo at 40lbs of boost is the biggest POS. Fuel only it surges after each gear change, but with two stages of spray boost pressure and drive comes right up and works great. S480/92 T4I 1.15a/r . 55psi boost & 60psi of drive. Fuel only, This turbo also surged after each shift (rpm drop)but wasn't as bad as the s480/82. You could bring the shifts points up quite a bit and it would prolly be fine. This turbo required a lot more gating to keep drive pressures in check with nitrous. So you would think smaller turbine wheel would make more back pressure and spin the compressor faster but it doesn't work like that. From what i've been told from Jose over at Forced Induction, the turbine is the limiting factor, it just doesn't flow the air as the larger 92 turbine wheel... kinda causing it to be "choked down" making less boost and drive. The smaller turbine wheel does spool way quicker than the larger one but it doesn't have any top end. [/QUOTE]

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