Classic Retrofit produce a mappable ignition unit that replaces the original Bosch CDI unit. The CDI+ is a ‘plug and play’ replacement for the original unit and offers microprocessor controlled ignition timing, hard, soft and launch rev limiters, tacho calibration, shift light output, max rpm tell tale and more. We had two Porsche 911’s in with back to back power runs. Although there was no noticeable difference to maximum power the new ignition units made a huge difference at the bottom end. With the original unit the power came in at 2400rpm but with the CDI+ the power came on much earlier at only 2000rpm. This is a significant improvement for real world driving making the car more responsive from low rpm. For more information check out their website at www.classicretrofit.com.
Dave Broughton of 911 Classics brought us a 911 race car running Bosch slide throttle fuel injection. The car was not running right so Dave asked us to put it on the rollers and find out what was going wrong. Graham ran the car up on the rollers and found that it was massively weak. Only 2.04% Co. An adjustment to the injection pump put that right bringing the Co’s up to 6%. The 911 is now delivering 198bhp at the wheels.