https://www.youtube.com/watch?v=wyJn40ExwZY
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Very good write up of the Subaru "rocket" anti lag system.
Beyond the Dyno: External Combustion Rocket Anti Lag System + JDM Spec C Impreza STI
Very nice article and videos!
Quote:
Originally Posted by makinen_fan
Quote:
Originally Posted by "Mirek
What could be the difference between Citroen and Ford? I would imagine that the springs, dampers, anti-roll bars, diffs and camber could have same set-up, stiffness etc. so the difference between the cars must be in the basic design (geometry) of the suspension in spite of simple regulations. At least Ford have more positive caster compared to Citroen.Quote:
Originally Posted by Sulland
Mikko once said that the design approach of Citroen is different but he did not won’t to go into details. JML said in “Vauhdin Maailma” that the body shell of the Fiesta moves/rolls more compared to the Polo and that the Polo is more sensitive to changes in the set-up. Juho commented in an interview that he start to feel sick because the Ford swings so much.
I think the most noticable difference is suspension travel, it looks much more at Fiesta (Polo too). So generally speaking DS3 looks much more "stiffer", imo more difficult to handle and looks like more prone to understeer, while Fiesta seems to be more driver friendly as he can throw it all the way round.Quote:
Originally Posted by OldF
Another noticable difference looks suspension geometry. I noticed only on Polo rear shock's angle is opposite to front ones, it looks like it is designed for heavy breaking on front and hard acceleration with more downforce on the rear (probably this helps for not so much understeer, asuming overall setup is same for every car), because of this geometry. this could be the whole difference in car handling in corners.
It is also possible I just talk rubbish... :)
Shock absorber top mounting points, i.e. the angle of the shocks on Polo is taken from Fabia S2000. VW admitted that openly. Nevertheless I believe the overall suspension travel of Polo is bigger than of Fabia. VW commented that the limit for suspension travel was in reliability of driveshaft joints under such extreme angles. The main reason why shocks are placed under such angle is to make them longer. M-Sport made them parallel like // while Škoda opposite like A. It's interesting that 208 R5 has them placed in Fiesta style //. The negative thing of the long travel is massive changes of geometry in extreme suspension situations as simple McPherson struts suffer a lot from this phenomena. There are also much higher forces in steering with the big castor angle. Visible body movement of Fiesta can hardly help overall performance, at least I can not imagine how. Maybe it helps the feeling of the driver, I don't know. Despite that all I believe the main difference between Citroën and Ford is in differential settings. In times of C4 WRC they even used 40/60 torque split on asphalt.
My thinking only:
Stiffer bodyshell same as stiffer springs, which is not good at icy or snowy surfaces. Longer suspention travel has nothing to do when there´s tarmac.
Back in the time driving my Ascona with stiff suspension and absolutely no grip on winterconditions was no good at all ( and that was in rdinary traffic going to the annual inspection of authorithies).
Back then I learned that smother suspention was a better thing in winthertimes even in raceconditions. Having said that it was on roads that wasn´t on tarmac.
Stiffer suspension and overall setup are better on asphalt, yeah CMR 2005 was my teacher several years ago :D
Hi
Some points regarding bodyshell and wheel geometry.
A stiffer bodyshell is almost always an advantage, in general the stiffer bodyshell the softer and more precise all wheel setups will be and also alot more sensible to fine adjustments. It`s almost impossible or very difficult to use the chassis softness as an advantage. Think of it: how can you adjust the chassis stiffness.