Bro, I just went over there. The service is quite okay and it's manually alignment the tyres instead of using computer.

I would rate 4/5 for the service and the price too.

Thank you for your service ratings, for the benefit of all readers here.

Glad that you appear to be quite happy with the outcome thus far.

Btw, mind sharing with us his price of manually-aligning a 2018 Saga vvt and how long you got to wait ?

After a month or two of rather 'extensive' driving and testing, try to test and update us later whether your Saga can at ALL times drive straight like an arrow (American speak) and planted/steady:
a )under varying conditions of lower (60-80 km/hr) and higher (100-130 km/hr) road speeds, and
b )occasionally with both hands off the steering wheel (Caution!) where condition permits, and
c )during acceleration, and
d )during braking etc.

Besides, test if you have equal ease or heaviness in making turns to Left or Right.

Await your feedback on Ah Man's finishings in months to come.

Edit: The bold above is sort of a highly pleasurable ultimate/near-perfect driving experience one can get to enjoy and benefit from on typical roads/streets driving .......
even from cheapo cars with non-adjustable Rear suspension systems like Rear Torsion Beam and/or Live axle imho.

This post has been edited by zeng: Oct 28 2021, 11:21 AM

How to install rear shims on cars with Rear Torsion Beams suspension for improved alignment 'tuning' ?

What are the benefits?

https://www.hyundai-forums.com/threads/do-i...ignment.232377/



Question: Can rear shimming be carried out on a Rear Live/Fixed Axle like Avanza's?

Note: Rear Torsion Beam suspension is found in most Vios, Corollas, Prius, Yaris, City, Jazz, Fit, Civics, Accents, Elantras, Kias, some Europeans and probably all Perodua's etc, subject to specific model years.

This post has been edited by zeng: Dec 10 2021, 09:54 AM

Tuning for Oversteering and Understeering..

link



Refering to this display/screenshot, has the writer got the corrections reversed/terbalik?

tyre pressure seems incorrect, it will actually result in more under/oversteer instead

but on actual road, tyre pressure give very less correction on under/oversteer, not as much as adjust the stiffness of suspension

2010 Hyundai Tucson Front Suspension parts.

I commented something regarding the above in another lowyat thread.

Attached below are pictorials of some parts in question.

1 )Front Spring & Strut;



2 )Front Stabilizer bar assembly and;



3 )Front Lower Control Arm and Steering Knuckle;



Enjoy...

this web correct. myself got handful experienced jor.
the other web told u terbalik rite. i know the reasons.


we play pressure becos it no cost. change suspension require dollar spent

Yea, that's what I was thinking too along the lines of lower tyre pressure gives relatively higher grip than higher tyre pressure, everything else being equal.

Having said this, it bases purely on 'tyre engineering' or properties.

Could the writer approach this subject of over-steer/under-steer corrections from the perspective of vehicle suspension dynamics (which we ignore totally) during turning/cornering, which may cancel, neutralise or over-run grip effects of lower/higher tyre pressure?

For all we know, the writer could be right ?

Btw, does higher tyre pressure results in higher spring rate of a car suspension spring system whilst lower tyre pressure results in lower spring rate of said suspension system?

This post has been edited by zeng: Dec 31 2021, 11:46 AM

i dont know much about vehicle suspension dynamics or motion ratio, maybe you should email the writer to get your answer why he will put higher pressure at front to overcome understeer

from my experience going through different kind of road including track, too much pressure will cause the tyre not being grippy at corner and at straight it will be bumpy as well, and you will risk the tyre burst when it get higher than the designed air pressure, higher pressure do get you lower rolling resistance though

running lower pressure will allow more part of the tyres in contact thus more grip, but pressure too low will cause the wheel spinning on tyre sidewall while cornering and you will risk your tyre ripping itself off the wheel, on normal driving you might experience bouncy ride because of pressure and soft tyre sidewall

i have experiment with both and i use 33-35psi hot pressure for track day and 40psi front and 37-38psi warm pressure for normal/high driving, and it doesn't really help much in solving understeer or oversteer issue, or maybe a very minor effect, but from the perspective comfort,

tyre pressure doesn't affect spring rate, spring rate is the properties of the spring, unless you change the spring or the spring worn out/damaged, the spring rate will remain constant regardless your tyre pressure

personally i refer to this post https://www.pistonheads.com/gassing/topic.asp?t=1110130 for more precise fine tuning, at the end of 3rd post there is the explanation on entry, mid-corner and exit understeer/oversteer and ways to overcome it, which i find it quite accurate since i can play around with the damper settings on track

but all these tuning and adjustment can only help you to a certain extent, if you did everything as told and your car still under/oversteer then that is the limit of your car/tyres and you are driving above limit, is time to look at your driving style instead

This post has been edited by amduser: Dec 31 2021, 08:08 PM

Not sure if I understood/interpret your position correctly, do you mean to say the pictorial by writer is correct?

@amduser may be right with his statement and experience above, which I generally concur .....
i.e the pictorial on understeer/oversteer corrections are not correct and indeed terbalik.

Besides in a vehicle turning or cornering scenario, increases in tyre pressure results in higher spring rate (on tyre contribution) that leads to tyre grip reduction.

Decreased tyre pressure correlates with lower (tyre) spring rate that leads to tyre grip increase.

From the viewpoint of vehicle suspension dynamics in a turning/cornering, @amduser's position is still valid imho.

This post has been edited by zeng: Jan 4 2022, 01:17 PM

many not realize. originals article base on racing slick not street tyre.
saja copy paste to post so make us all upside downed

another reason is becos of posche website maa.
everything become correct when u put reverse gear

so zeng ur way is correct. dont hesitate.

regarding over-understeer. play with tyre pressure on avanza quite strong effect. weight reduction also affecting very much

Is it, on an Avanza?
Ok, will give it a try on my Avanza as I can feel some over-steer right now.
Rear tread depth is low though at around 2 -2.5 mm (at about 100-105k kms usage).
Front tread depth now is about 3 -3.5 mm at about 83k kms usage.
Right Front outer edge wear more than inside edge and Left Front like a difference of say 0.5 mm due to previous mis-alignment I think.

This post has been edited by zeng: Jan 5 2022, 09:55 AM

the key is pam front wheel correctly. twist steer at shopping mall simen type car park no squeeze noise = just right.
then increase rear wheeel accordingly.

the difference between front vs back is just 10kpa my final results

My last known or pumped tyre pressures some 2 months ago were:
275 kpa Front

255 kpa Rear.

Any suggested tyre pressure values?

before weight reduction F270 R230 superb grippy easy control

after buang 3rd seat & spare taya, tend to understeer so F260 R270 is perfects.
the rest full ori never align wheel since bought

When you buy and install brand new tyres on your car(s), beware of brand new tyres with Tyre Conicity defects leading to vehicle pull to one side, despite 'perfect' wheel alignment works being done.



Source:
Diagnosing Tire Pull
by www.tirerack.com

This post has been edited by zeng: Jan 7 2022, 01:38 PM

Wow you both really like really hard pressures.