From the comeracing website
Ecotec V6 4.2 litre Blower engine
The Ecotec Holden V6 has come a long way. With our development of a full range of performance parts for these engines there are new limits to their capabilities. The engine shown above started as one of our off the shelf outright crate motors to suit boost applications. This engine is sold as a long motor outright for $10,500.00 fully dyno run in, in normally aspirated form ready to receive whichever form of boost setup you prefer, blower or turbo. This particular customer supplied us with a very large (too large) Vortec blower and full kit including intercooler, blow off valve, injectors, fuel pressure regulator, pulleys etc. to complete the blower installation. Unfortunately the regulator was faulty, the lower pulley did not fit the stock balancer and we had to do major fabrications, the top blower pulley was way too small for an engine this size and a new $400.00 version was needed. There were many other small items needing to be done and other pieces fabricated to make this a viable installation. Buyers need to keep these factors in mind when buying a $10,000.00 plus blower kit that is supposed to be a "simple" bolt on.
Using the latest Kalmaker Mafless boost software and fitted with our newly developed Twin Throttle Body Ecotec intake manifold plenum this little "midget" engine displacing 256ci (just under 4.3 litres) made 505 BHP @ 5750 rpm and 424 ft.lbs torque @ 4500 rpm Maximum boost at 5750 rpm was 14.5 psi
The size of this blower being clearly too large was evident in boost lag below 3500 rpm. In fact we saw 3-4 psi @ 2750 fully loaded at which point the engine made 291 ft.lbs torque. By 4000 rpm the boost was rushing in at 8-10 psi and 415 ft.lbs was registering. At the peak rpm of 5750 peak torque of 461 ft.lbs hit home. Now considering the size of this little engine, pump fuel being used and VERY, VERY conservative tuning this power/torque is pretty astonishing when one looks at the low rpm range.
We still feel a smaller blower would have worked better to maximise overall results and reduce the lag that most people associate with turbos. Trust me the blowers if too big are no different. Nevertheless considering the results you could easily shove this little monster into a typical VS Commodore with a set of 3.9:1 diff gears, slicks, optimised exhaust system and say a boost friendly torque converter with about 2800 rpm stall speed and easily run high 10 second 1/4 mile times. Then just drive it home and achieve great fuel economy. The latest "self learn" feature of the Kalmaker software optimises the fuel curve almost itself in no boost cruising situations off the normal dual O2 sensor imputs and keeps the engine clean and efficient at part throttle.
Engine specs: COME 4.2 litre stroker crank (nodular iron) 3.700" stroke, custom length "H" beam 4340 steel rods, Wiseco forged 8.2:1 compression forged pistons, fully ported Ecotec cast iron factory cylinder heads which flow over 350 bhp through intake ports, COME CSBR-523 hydraulic roller camshaft, Speed Pro lifters, COME Conical valve springs and chrome moly retainers, single row timing set retaining balance shaft for street smoothness, blueprinted production oil pump, fully prepared block with line honed main tunnels, bored and torque plate honed to +.030" oversize, deck surfaces machined and equalised with "O" ring grooves cut and "O" ring wire fitted, Ridgecrest custom made copper head gaskets fitted. Production rocker arms and pushrods retained. They are very strong pieces and everyone throws them out...how stupid can you be? Use them they are tough pieces. Only the pushrods need replacement if you are going to really "turn" the engine very hard. New COME Twin Throttle Body intake plenum fitted on port matched stock Ecotec intake runner base. Stock PCV breather system eliminated to prevent interraction with boost application. Will need external breather setup via rocker covers to catch can or more elaborate breather system.
Originally Posted by cmcpokey
.. Just wait till i bust a cap in the donk and get LSD it's going to be a healthy V8 killer one day
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How about the chrome strip in the front bar missing any good?.. At the moment holden don't have stock of them as they are looking for a new supplier I'm told.
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