http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/ Autoblog Comments for 2012 Mazda RX-9: Winding Road adds fuel to the fire http://www.autoblog.com/media/feedlogo.gif http://www.autoblog.com en-us Copyright 2008 Weblogs, Inc. The contents of this feed are available for non-commercial use only. Blogsmith http://www.blogsmith.com/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/Dec 31st 2007 2:15PMhttp://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/Dec 31st 2007 2:22PMhttp://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/
I'm a bit shocked it doesn't have a dual-clutch sequential gearbox mentioned in there.

Anyway, the 2nd gen RX-7 had a twin-scroll turbo, which accomplishes the same thing as a variable geometry turbo, which is to extract maximum power from the lower-flow gases at low revs and small throttle openings.

It'd be nice to see Mazda make another turbo Wankel, even though they claim the side-port Renesis isn't particularly well suited to one.]]>Dec 31st 2007 2:35PMhttp://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/
Variable geometry turbos are designed to allow the effective aspect ratio (A/R Ratio) of the turbo to be altered as conditions change for better performance. For example, at lower rpms the a/r is less for a lower boost threshold, less lag, better response. At higher rpms the a/r ratio changes to a greater ratio so that the turbo doesn't choke at higher engine speeds, exhaust manifold pressures are decreased, and ultimately power output is increased as a result.

Twin scroll turbos work differently by requiring a divided exhaust manifold to separate the rotors or cylinders whose cycles interfere with one another to best utilize the engine's exhaust pulse energy. For example, on a four-cylinder engine with firing order 1-3-4-2, cylinder #1 is ending its expansion stroke and opening its exhaust valve while cylinder #2 still has its exhaust valve open (cylinder #2 is in its overlap period). In an undivided exhaust manifold, this pressure pulse from cylinder #1's exhaust blowdown event is much more likely to contaminate cylinder #2 with high pressure exhaust gas. Not only does this hurt cylinder #2's ability to breathe properly, but this pulse energy would have been better utilized in the turbine. The proper grouping for this engine is to keep complementary cylinders grouped together-- #1 and #4 are complementary; as are cylinders #2 and #3. Because of the better utilization of the exhaust pulse energy, the turbine's performance is improved and boost increases more quickly. ]]>Dec 31st 2007 7:38PMhttp://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/Dec 31st 2007 7:45PMhttp://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/Dec 31st 2007 2:55PMhttp://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/Dec 31st 2007 3:02PMhttp://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/Dec 31st 2007 3:14PMhttp://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/
Direct injection with water injection on a 3 rotor turbo rotary would be great. haha, I think that's a future project for me]]>Dec 31st 2007 3:10PMhttp://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/
If this "make believe" car were to come true, if powered by anything other than a Rotary wouldn't be a RX car.

Most likely if RWD would be a MX series. Maybe a large Miata MX-5 so say a MX-9 or a reborn RWD MX-6?]]>Dec 31st 2007 4:06PMhttp://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/Dec 31st 2007 4:39PMhttp://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/Dec 31st 2007 5:19PMhttp://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/
one question: why would one consider an engine to have two, quite different, displacements? where there two different engines to choose from?

I thought it was only 1.3 liters.]]>Dec 31st 2007 3:14PMhttp://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/Dec 31st 2007 3:16PMhttp://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/
"While a four-stroke piston engine makes one combustion stroke per cylinder for every two rotations of the crankshaft (that is, one half power stroke per crankshaft rotation per cylinder), each combustion chamber in the Wankel generates one combustion stroke per each driveshaft rotation, i.e. one power stroke per rotor orbital revolution and three power strokes per rotor rotation. Thus, power output of a Wankel engine is generally higher than that of a four-stroke piston engine of similar engine displacement in a similar state of tune and higher than that of a four-stroke piston engine of similar physical dimensions and weight. Wankel engines also generally have a much higher redline than a reciprocating engine of similar size since the strokes are completed with a rotary motion as opposed to a reciprocating engine which must use connecting rods and a crankshaft to convert reciprocating motion into rotary motion.

National agencies that tax automobiles according to displacement and regulatory bodies in automobile racing variously consider the Wankel engine to be equivalent to a four-stroke engine of 1.5 to 2 times the displacement; some racing regulatory agencies ban it altogether."]]>Dec 31st 2007 3:19PMhttp://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/Dec 31st 2007 3:22PMhttp://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/MAZDA WOULD DO BETTER BUILDING A TURBO CAR RATHER AN N/A GAS GUZZLER.

NOW THAT I KNOW THE CAR IS A FAKE, I HATE IT.
IT BASICALLY LOOKS LIKE A G35.

IT DOESN'T MATTER WEATHER ITS RX-ANYTHING, JUST MAKE A FASTER ROTARY, MAZDA!

COME ON, THE SUSPENSE IS KILLING ME ALREADY!
]]>Dec 31st 2007 3:24PMhttp://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/Dec 31st 2007 4:15PMhttp://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/Dec 31st 2007 4:15PMhttp://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/http://www.autoblog.com/2007/12/31/2012-mazda-rx-9-winding-road-adds-fuel-to-the-fire/Dec 31st 2007 4:25PM