All you guys who're running moderate boost (20+psi) with no intercooler, how are you finding the power improvements?
I've just got my Isuzu fuel pump sorted and am running 19psi peak to keep EGT's at 750 deg C. I'm finding it takes a reasonably large increase in boost to drop the EGT's and the power to drive the turbo is noticable.
I wound it up incrementally from 14psi and found 19 was necessary, but it was noticably faster at 14 (up to when you have to lift the foot). Calculations seem to support this, 19psi on a 65% efficient compressor gives only 10% density increase over 14psi.
The bad side is predicted turbo exit temperatures shoot from 110 deg C to 130 deg C and the power required to pump that air goes from 9 to 14kilowatts at 2000rpm.
An intercooler is next on my list, but I'm wondering how you guys without them are getting on.
I've just got my Isuzu fuel pump sorted and am running 19psi peak to keep EGT's at 750 deg C. I'm finding it takes a reasonably large increase in boost to drop the EGT's and the power to drive the turbo is noticable.
I wound it up incrementally from 14psi and found 19 was necessary, but it was noticably faster at 14 (up to when you have to lift the foot). Calculations seem to support this, 19psi on a 65% efficient compressor gives only 10% density increase over 14psi.
The bad side is predicted turbo exit temperatures shoot from 110 deg C to 130 deg C and the power required to pump that air goes from 9 to 14kilowatts at 2000rpm.
An intercooler is next on my list, but I'm wondering how you guys without them are getting on.