Been on a rolling road day today, and the car was run with disappointing results.
Spec: T34.48, 55lb siemens, Pace cooler, 4x4 inlet plenum, bosch 044 fuel pump.
On motorway car pulls well, peak of 30psi, holding 25-26psi through most of the revs, not sure over 6,000 rpm though (need to check), wideband AFR gauge indicates approx 11.5-12 on boost.
Anyway was expecting bhp 340+ish
Results of runs 2 & 3: 290's clutch bhp, 270's bhp at wheels (average transmission loss = 17 bhp), 360's lb/ft torque.
I can't understand why if the car is holding boost (significantly more than a T3 can), how it is under 300bhp ? And why the bhp doesn't raise even slowly after the inital boost spike.


RR was at AwesomeGTI, cooling fan on for runs, other Saphs gave reasonable results for there spec.
My intercooler practically touches my radiator, but would be supprised if the heat sink from that caused the issue.