First review of the Proton Exora

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First review of the Proton Exora

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Myclamyra	Mar 18 2009, 12:40 AM Return to original view \| Post #1
Casual Junior Member 394 posts Joined: Sep 2005 From: Satay Town!	1. I really wish for any of the car journalists to define 'underpower'. Really, in the age of GPSs and accelerometers, some attempt should be given to the test how much acceleration is felt at a given RPM change, say from 0 to 2500. 2. Then you have many cases of 'underpower' - moving from stand still, overtaking, time delay after slamming the pedal before power kicks in, RPM at cruising speed... which one? 3. Other than light turbo, if the only concern is start from stand still, I'd recommend electric motor assisted i.e. should EVE ever land into the CAMPRO it'll nullify any low RPM torque concerns
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Myclamyra	Apr 17 2009, 09:39 AM Return to original view \| Post #2
Casual Junior Member 394 posts Joined: Sep 2005 From: Satay Town!	This is a pretty nice MPV having driven/been in Grand Livina, Innova, Wish, Citra, Estima and Stream. BTW, all the above use extensive plastics, and I will say Exora's is better blended than Livina. The driving position is something that is not mentioned much here. I drive mostly Hondas and Protons, (I can't take Toyotas and their 'floating in the air' feel). Exora feels just right.
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Myclamyra	Apr 19 2009, 12:56 AM Return to original view \| Post #3
Casual Junior Member 394 posts Joined: Sep 2005 From: Satay Town!	Lets kill this 'underpower' thingy once and for all. I ran three MPVs using the script found here. I wouldn't recommend running a racing acceleration calculation for MPVs, but this should give enough insight that the Exora is not overly underpowered compared to its closest rivals. For all practical purposes, the driver would not feel the difference. Having said that, the heavier Exora does effect it's overall acceleration. Note: Please add 3-4 seconds in front of the graph because the graphs do not start at 0 mph. » Click to show Spoiler - click again to hide... « Carrying a 180lb driver Carrying a 1000lbs family Copyright 2007 The Regents of the University of California. All Rights Reserved. Permission to use, copy, modify and distribute any part of the software for educational, research and non-profit purposes, without fee, and without a written agreement is hereby granted, provided that the above copyright notice, this paragraph and the following three paragraphs appear in all copies. Those desiring to incorporate this program into commercial products or use for commercial purposes should contact the Technology Transfer & Intellectual Property Services, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0910, Ph: (858) 534-5815, FAX: (858) 534-7345. IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS COPYRIGHT, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. THE SOFTWARE PROVIDED HEREIN IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. THE UNIVERSITY OF CALIFORNIA MAKES NO REPRESENTATIONS AND EXTENDS NO WARRANTIES OF ANY KIND, EITHER IMPLIED OR EXPRESS, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, OR THAT THE USE OF THE SOFTWARE WILL NOT INFRINGE ANY PATENT, TRADEMARK OR OTHER RIGHTS. By action of downloading and/or using the program, you accept the terms and conditions stated above.
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Myclamyra	Apr 19 2009, 01:53 AM Return to original view \| Post #4
Casual Junior Member 394 posts Joined: Sep 2005 From: Satay Town!	QUOTE(ar188 @ Apr 19 2009, 01:26 AM) Weight: lbs Drag Coefficient: ?? Frontal Area: ft2 1. interesting program, but just wondering, how did you derive these items from the 3 cars? 2. I think the real life Speed vs time graph will be very different from the graph above.. too much assumptions being plugged in to the calculator not to mention engine torque graphs for the 3 cars are probably measured on 3 different dynometers and under 3 different conditions.. 3. also there are 2 shift points shown on the graph.. which a lazy shifting auto box may cause 1+seconds difference of shifting lag between the cars.. (here can see all assumed to shift with the same lag times which we know different autoboxes have different shift lags) 1. By looking up their catalogs . For simplicity, I've assumed the drag coefficient to be 0.34 across the board, with a frontal area of 30ft2 for Exora (probably overkill), and 27ft2 for the rest. Do note that typically drag coeffs (and effects of frontal area) start having noticeable impact >60kmh. So for what we're looking for here ('underpoweredness'), aerodynamic drag is not very applicable. 2. Yes, an MPV driver won't rev up to 6000rpm on gear 1/2 . Torque curves are from pictures posted on Paultan for the Campro CPS and 3SZ-VE (Toyota), while the HR15DE is from some Japanese website. 3. I've put the auto box shift at 1000ms or 1s across the board. Nevertheless, the characteristic that we're looking for is the slope - representing acceleration. If the slope is drastically shallower, then one can claim that the Exora is underpowered. Clearly, this is not the case. Lastly, look at the cruising RPM at 80mph (128km/h) (bottom of table), the Grand Livina has an advantage there, but against the Avanza it's nearly the same. But like all things engineering, one can only verify the calcs with actual test...
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