Thought i would share this info about the gains from fitting cosworth heads and plenum along with HKS cams. I had a dyno done before and after i had the work done to my car.

First dyno was with APS TT, Cosworth internals, Haltech ecu. Car made 460 at the hub with 418 torque. Car set at 1.0 bar.

Took another dyno with the same as above but including cosworth plenum, cosworth heads and HKS cams installed. car made 542 at the hub with 494 torque. Car set at 0.9 bar.


So what a difference car made over 80 hp at the hubs and 80 torque using 0.1 bar less. Which means the plenum heads and cams combined really help the engine to relax a bit while producing more power .