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Inside: Renesis engine illustration, Power-Torque curve, Dynamic induction engine illustrated, DSC secret explained


Engine of RX8 is Front-midship Renesis twin rotor naturally aspirated, multi side port, water cooled
Engine Capacity cc (mL) 1,308 (654 x 2)
Max Power kW @ rpm 177 @ 8200
Max Torque N-m @ rpm 211 @ 5500
Fuel System   Electronically controlled, fuel injection
Compression ratio   10.0 : 1
Induction system   #S-DAIS sequential dynamic air induction system
Ignition system   Electronic high-energy ignition; two spark plug per rotor chamber; direct ignition with one coil per spark plug
Lubricant capacity Litre 6.7
Coolant capacity Litre 9.2
Fuel capacity Litre (type) 61 (PULP)
Fuel consumption 12.6 L/100 km

Renesis engine illustrated
Quicktime download Renesis.MQV 300K (2.91Mb zip file)

Power - Torque curve of RX8
(click for enlarge image)

click for large image

S-DAIS (sequential dynamic air induction system) explained

~WOT 3250 rpm
WOT 3250~5500 rpm
WOT 5500~6250 rpm
WOT 6250~7250 rpm
WOT 7250~

Transmissions   Hydraulically operated clutch; 6-speed manual gearbox
Ratio 1st to 6th, (Final) 3.760/2.269/1.645/1.187/1.000/0.843, (4.444)
Chassis and suspension    
Steering   Electrically assisted, rack and pinion steering
Turning circle kerb to kerb 10.6
Weight distribution Front:Rear 50:50
Drive chain   Rear wheel drive
Suspension    
Front Type Double wishbones: concentric coil springs and telescopic shock absorbers, tubular anti-roll bar
Rear Type Multi links: concentric coil springs and shock absorbers, tubular anti-roll bar
Brake Type Ventilated discs single piston, two pin calipers; vacuum servo assisted
Front diameter (mm) 323
Rear diameter (mm) 302
Tyres   Potenza RE040 225/45R18 91W
Wheels   18 x 8.0 JJ
Dimensions    
Overall length mm 4435
Overall width mm 1770
Overall height mm 1340
Wheel base mm 2700
Kerb weight kg 1337
Cargo Room litres 290 (without space shavers)
Advance Electronics    
Anti-lock braking System (ABS)    
Electronic Brake-force Distribution    
Dynamic Stability Control (DSC)   switchover on/off - please read below
Torque-sensing Super Limited-Slip Differential (LSD)    
Traction control    

Dynamic Stability control (DSC) explained

DSC demoYou only halfway switch off the complicated electronic assistant of the RX-8 by pressing on the DSC on/off button. And you can toggle between DSC on and off while driving. With the stability control off, the effect is a more sensitive throttle response but a slightly more over steer car. It is still controllable and make it a much faster and yet rumoured to be more economical car. However, there is more.

To switch off all the electronic assisted functions. You pressed and hold on the DSC off button for more than 7 seconds until the slippery warning light appears on the tachometer (as shown on the left). Please do it when you are on the safe road, for example, on the race track. Once you have totally switched off DSC, you have to re-ignite the engine to reset all the functions. To see the difference in RX-8's performance. The video from the Best Motoring Magazine demonstrate this.

The runs are as follows (on a wet road at speed 110km/h 25 m radius left):
1. Normal RX-8 with DSC ON
2. Normal RX-8 with DSC OFF
3. Normal RX-8 with DSC TOTALLY OFF
4. MazdaSpeed RX-8 A Spec with DSC TOTALLY OFF

DSC_demo.wmv 150Kps (3.58Mb zip file)

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