1. One of the main contributor for good crash result is the weight. Bezza is 930kg max while iriz 1180kg max. In frontal odb test, the kinetic energy come from the car itself. Crash engineer rule of thumb, 100kg reduction leads to 10% less intrusion @ firewall. Easier to get good result.
2. Engine package. The smaller the size (not cc), the better the crash result. Bezza has good engine package.
3. Crash is stochastic event, very difficult to get consistent result especially @ lower leg area. Let say you can get max 16 points in one test, you can get as low as 15.4 points in another test. So if iriz 14.07, most probably due to it is at the lowest limit (engineer task is to ensure that in the worst variation, it can still achieve the target)
4. Crash result depends on dummy calibration. For each area, head, neck, chest, femur, tibia etc there's a corridor that the dummy need to comply. let say chest deflection, you can have variations up to 6mm between dummy to another dummy. If in the test, you get dummy calibrated at the lower corridor, then you're lucky.

How do I know this? I used to worked as crash simulation engineer for audi.

For you to compare iriz and bezza result is unfair due to huge weight difference, this has been explained in NCAP FAQ. In high speed collision between both car, bezza has less chance to survive. Bezza has max 590MPa steel, iriz has countless 590MPa, a few 780,980,1180MPa parts with a couple of 1470MPa grade of hot formed steel

1. Have you seen the 360 videos right? There is CAE analysis video of side impact. The intrusion were targeted at b pillar lower area. This means less intrusion at the chest and pelvic area. That should indicate a very good side impact result even without side and curtain airbag. Mind you that iriz use HPF grade for side impact.

2. Bezza has the advantage also, being lightweight, the inertia of the whole vehicle is less than iriz. But Bezza only use max 590MPa (advance high strength steel), the rest 270MPa (mild steel), 340MPa and 440MPa (high strength steel)
I manage to find a picture of bezza body in white. From the picture it is hard to imagine what type of material that they use. The color code is probably not indicate material, but crash load path (front, side etc)
http://www.automachi.com/2016/07/why_perod...an_ncap_5_star/
So who knows, unless they test the car and publish the result

If both hurling at each other with both vehicle speed 64kph 40% offset , vios will surely die. There is a finite element model of Toyota yaris sedan 2010 US version which is equivalent to Toyota vios dugong in Malaysia readily available to download at national crash analysis center, George Washington university. Oem use this as benchmark. I have seen it. The structure is weak.

Based on yaris model, only one part has tensile strength >1000Mpa, the rest max 590MPa

This post has been edited by tidus2k: Aug 23 2016, 09:02 AM