Spoil steering response

H-shaped torsion beam rear axle in NCP10 Vitz spoils the steering response.

Remembering history, Peugeot 205, EP82 Starlet, former had a torsion beam on trailing hinge line, latter had it on wheel center line with lateral rod support, steering responses were different from each other.

Then haw about H-shaped one on Vitz ? I'm afraid to write on this, rear axle is easy to move inconveniently in very initial stage on steering action, naturally because of loosing lateral support by another arm, lateral rod. So, such kind of standing point of view, lateral supports are indispensable factor to establish firm and confidential reaction on steering.

The comparison upper different constructions of rear axles proves the necessity of lateral supports, primitive imagination by kids may understand this physical property, however hard the engineers may prepare rhetorical flourish like "Self toe control new system".

Astringency on steering

Lack of astringency on steering reacations are observed on NCP10 Vitz being far from that of EP82 Starlet with some modification for that important physical property. Checking the luck mounting adapters this morning, proved the cause of strange action owes only on the clucked and easily deformable compliance bush equipped on frontal lower arm rear portion. This bush need some modifications, filling with liquid urethane rubber or complete replacement into bB model's lower arms assembly, if I continue this new commer.

Remembering 10 years ago before starting DIY vehicle manitenances, on the way of servicing I knew that the point should be put an emphasis on, the accuracy of vehicle construction, the factory just assembled with no adjusting. But, I didn't know why nor how this kind of dilemma must be processed in my mind. Trying to adjust the wheel alignments, I visited some professional's, but in vain no satisfactory was obatained.

The fact was the reason to made me go into this field. Now I feel in the end, it deos matter wheather how did I work on it efficiently.

Nav. adapter

Re-tightening the bolts on rear axle connecting with hub case on left side were performed on NCP10 Vitz for securing. Also the adapter to adhere portable navigation system onto handle column was created with wood piece by grinding the 3dimesionally concaved shape, painted in black color, being not like hand made one.

The best way to check the establishment of wheel alignment and geometrical axle construcions are followings.

Stopping and starting without any adjustments on steering wheel.

Capable to keep straight running at least 100m on the flat highway under no adjusting.

The center feeling of the vehicle duplecates on that of driver.

As a resultant disadvantage, easily becomes sleepy the driver because the driving concentration is not reqired.

Thrust angle on XH200W B-Vectra

The thrust angle on XH200W were adjusted firmly today, the errors were caused by rear lateral arm ball joints replacement last time. The angle value was minus 1min and 19sec. Though the steering action with this error was almost acceptable, I dare adjust to the utmost accurately on earth, needless to say that the steering action became far better, far tight in centric position.

By the way, the permissible tolerance on European Safety Standard is plus minus 10 minutes on thrust angle.

For measuring and adjusting laser pointer equipped special was used on the distance of 2645mm. The value of negative cambers for rear axle were previously fixed precisely at the inclination of 90min, utilizing 1719,75mm diameter pendulum special tool, the reason for the diameter is convenience of reading 2min/1mm.

Enjoy labor

In order to overcome hardships I make it a rule to percieve them as just playings, try to enjoy doing them. The success is just in touch a micrometer forwad, so continue making efforts. I may change myself to any direction or even may stop anytime I want, but the destination is just in touch, this is only a play, not so difficult. Also today I'll play in something.

Butyl rubber material

Butyl rubber material has inevitable physical property so to speak plastic deformation under sustained loading. The frontal strut upper mount on vehicles supports over 500kg all the time in addition to vertical resisting brakeing power. So this part has tendency to deform gradually as time passes, causing frontal height down. As a matter of fact, the caster action reduces because of loosing frontal height. This phenomena happens so slowly as not to be realized by ordinal driver, if the stability is lost while straigh running by loosing caster action.

This is why many of rubber parts in vehicle should be replaced as periodical replacement parts.

In another words vehicles are capable to continue so long time as 200,000km or 20years if the maintenaces are performed properly.

Mission

Today's CNN began with the mission of Israel at Meditaranian Sea near by Gaza in international waters. Turk's flotilla with supporting aids for Hamas was cought by Israely Defence Force. They always play strong maneuvers depending on their own policy, being downfallen by the Ancient Roman and newly estblished Jewish country after the WW2, they have no way to loose Israel, it unmovable their standing point .

60 years ago we Japanese were destroyed by US with 2 Atomic Bombs, Fat man and Little boy, how about our policy and idea now after that ?