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Here's some comments that I stole off someone who was there and has a lot of experience with our td42's.
Fitting a special 12mm produced some very impressive boost response values. The only tune we did was to adjust boost to produce acceptable stable EGT's. We saw 15psi at 1400rpm, 25psi at 1700rpm, 32psi at 1950 rpm and 37psi in at 2100 rpm in a 4th gear pull. Combining these values with the comp map this turbo produces some 38 lbs/min before 1900rpm to produce I would expect a very impressive torque response curve. Until the clutch is fixed and flywheel lightened it is a bit pointless doing a dyno run to see how this turbo effects the torque curve and how torque could be effected by the small turbine above 3000rpm.
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