After more than 23 hours on the engine dyno, we're now ready for the next step in refining our EFI conversion. We've installed our test engine in a 77 930 for driveability refinement and tuning.

  Why would would this added step be necessary if we've already obtained good cold start, throttle response and power? Quite simply, the results of this time consuming process explains, to a great degree, why the original RUF Yellow Bird matches/exceeds the peformance of many 600+ hp EFI-converted Porsche's you see posted on the web while having "only" 475hp.

  And in our case, explains why our 2.1litre twin turbo, with enormous valves, cam overlap, no flywheel and a 6 inch diameter multi-plate clutch starts and runs like a street vehicle while turning identical to GT1 level naturally aspirated GT3RS's in PCA Club Racing. EFI systems - especially sophisticated ones using the the latest technology like ours - employ an enormous amount of criteria to build an optimized map. Do not let anyone tell you they can program and tune your EFI system only using an engine dyno, chassis dyno or on the street - it can take all three.
Once we've finalized the map on our shop's engine, we'll then re-install the car's original engine - now built with one of several packages we now offer optimized to our EFI conversion, read about it here - and repeat the driveability refinement process on it.

  You've seen this motor on the engine dyno but we think seeing it in an actual car will not only give you a better idea of 'where and what' of component placement (pass your mouse over the blue arrows) but also demonstrates just how simplified your engine compartment becomes once you've removed your CIS system. When was the time you opened your decklid and were able to see both shock towers? Probably the last time the engine was out.

As you've probably noted from this motor's Engine Dyno Sheet, power readings were taken at rather high ambient temperatures and thus understated compared to more 'real world' driving conditions. Unlike CIS, this system has the latitude and accuracy to adjust for these extremes while still protecting your engine.