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 Ask my anything about tires, I am a tire engineer

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ktek
post Sep 10 2022, 11:44 PM

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QUOTE(zeng @ Sep 10 2022, 11:22 PM)
Thanks for the heads up.
You're right. A quick search shows 2008 and up Sagas  are rear torsion beam design.
I owned 3 Sagas from 1985 to 1990, IIRC they were all rear multi links but not definite about it.
Any info on rear suspension designs of Sagas from 1991- 2007?
Early Wira's are definitely rear multi link design.
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saga this type. wira correct no problems
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ktek
post Sep 10 2022, 11:50 PM

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QUOTE(e-lite @ Sep 10 2022, 11:31 PM)
out of topic a bit but for discussion.
how michelin / bf goodrich manage to sell so expensive tyres?
is it because they use premium grade compound/manufacturing process? is it because they invest back into r&d?
i have used michelins before and know what they have to offer. sometimes even more than twice the price of other top 5 tyre brands.
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runflats oso double prices
zeng
post Sep 10 2022, 11:52 PM

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QUOTE(ktek @ Sep 10 2022, 11:44 PM)
saga this type. wira correct no problems
user posted image
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Ohh.... Iswara is pre 2007.
mdziaf
post Sep 11 2022, 10:09 AM

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QUOTE(BoomerangCircles @ Sep 10 2022, 10:21 PM)
Sad, I ask tyre he answer safety and cars and not related to tyre…..

Normal condition, corner maintain 60-80km/h will pass. If the tyre sound. Then reduce the speed. That’s what I get from testing and testing. Of course testing on when no traffic around.
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You do know that tire squealing isn't a sign that you are at the limit of grip but more indicative of improper input from the driver when taking a corner and/or bad car alignment and/or under inflated tires.

If the tires are worn down, then yes the tire can start to squeal if you are asking similar lateral G performance from the tire like when it was new. But since you were asking for brand new tire performance this doesn't apply.

So again you might think you are doing things safely since no one is around, but bad alignment/improper inflation can lead to sudden loss of control. If you really want to test your car do it on the track.
Vsmh
post Sep 11 2022, 02:56 PM

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QUOTE(ktek @ Sep 9 2022, 10:48 AM)
i recommend u go simen parking lot. stop the car without motion. pusing steering to left & right end.
got squeek noise? increase pressure 1 step (5kpa or 1psi).

or another way round, u pump high 300kpa, go parking lot test. slowly reduce until squeek noise appear. read the pressure and save forever.
thats how i find best surface grip for low speed turns
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the sound is supposed to indicate proper contact patch with the road?

QUOTE(zeng @ Sep 10 2022, 11:35 PM)
At similar air pressure, the load capacity of your R15 likely exceeds that tyre sizes on the sticker.

So, you'll never overload and safe.
The tyre alignment finishing  car owners are getting in the market are very mediocre and cin cai imho, including those whose print out (which is rarely given to customers) have numbers within green zones.

I'm also in search of a 'perfectionist' alignment shop. Somebody here did suggest a xxx Hin along Jalan Klang Lama if you're in klang valley, which I'm yet to try him.
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I hope this hin is not (H.i.n Leo.ng) the tire shop which many people refer to as kedai papan with decent tires prices? Because if yes, forget about them lol. Car drove out terribly. I mean its probably difficult la, not everyone has felt what decent handling is and most customers probably wont even notice, they just feel the steering being light and doesnt makan sebelah then they okay liao.
minizian
post Sep 11 2022, 05:33 PM

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Usually if new tires, how long for it to run in before can start pushing it?

For me I will drive normally for 1000 KM before start to push around.
ktek
post Sep 11 2022, 06:33 PM

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QUOTE(mdziaf @ Sep 11 2022, 10:09 AM)
You do know that tire squealing isn't a sign that you are at the limit of grip but more indicative of improper input from the driver when taking a corner and/or bad car alignment and/or under inflated tires.

If the tires are worn down, then yes the tire can start to squeal if you are asking similar lateral G performance from the tire like when it was new. But since you were asking for brand new tire performance this doesn't apply.

So again you might think you are doing things safely since no one is around, but bad alignment/improper inflation can lead to sudden loss of control. If you really want to test your car do it on the track.
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so do u know answer is how much kph
ktek
post Sep 11 2022, 06:37 PM

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QUOTE(minizian @ Sep 11 2022, 05:33 PM)
Usually if new tires, how long for it to run in before can start pushing it?

For me I will drive normally for 1000 KM before start to push around.
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how u differentiate drive normal & push around
minizian
post Sep 11 2022, 06:47 PM

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QUOTE(ktek @ Sep 11 2022, 06:37 PM)
how u differentiate drive normal & push around
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Drive normal = go to work via highway at normal speed

Push around = going around genting as an example
ktek
post Sep 11 2022, 06:50 PM

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QUOTE(minizian @ Sep 11 2022, 06:47 PM)
Drive normal = go to work via highway at normal speed

Push around = going around genting as an example
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low speed turn only there bored
RalphRatedR
post Sep 11 2022, 09:48 PM

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QUOTE(minizian @ Sep 9 2022, 01:07 AM)
Speaking of tire and its limit, is there such place as a skid pad in Malaysia where one are able to test the car grip (especially in wet road) in safe environment.
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The only one I know is the one at Proton's test track. No idea if it's opened to the public.

3.0397578, 101.5675735

This post has been edited by RalphRatedR: Sep 11 2022, 09:55 PM
minizian
post Sep 11 2022, 10:27 PM

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QUOTE(RalphRatedR @ Sep 11 2022, 09:48 PM)
The only one I know is the one at Proton's test track. No idea if it's opened to the public.

3.0397578, 101.5675735
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This track was opened at one of the proton carnivals many moons ago. I recall sitting in one of the suprima over the oval track.

Closest thing to oval racing drool.gif

This post has been edited by minizian: Sep 11 2022, 10:29 PM
BoomerangCircles
post Sep 13 2022, 11:40 AM

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QUOTE(mdziaf @ Sep 11 2022, 10:09 AM)
You do know that tire squealing isn't a sign that you are at the limit of grip but more indicative of improper input from the driver when taking a corner and/or bad car alignment and/or under inflated tires.

If the tires are worn down, then yes the tire can start to squeal if you are asking similar lateral G performance from the tire like when it was new. But since you were asking for brand new tire performance this doesn't apply.

So again you might think you are doing things safely since no one is around, but bad alignment/improper inflation can lead to sudden loss of control. If you really want to test your car do it on the track.
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Of course on the track.
Theeban
post Sep 19 2022, 05:32 PM

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How to increase straight line stability?
zeng
post Sep 19 2022, 06:14 PM

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QUOTE(Theeban @ Sep 19 2022, 05:32 PM)
How to increase straight line stability?
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By cun cun aligning the 4 wheels in a 'near-perfectionist' wheel alignment shop which is very hard to come by .
Theeban
post Sep 19 2022, 10:52 PM

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QUOTE(zeng @ Sep 19 2022, 06:14 PM)
By cun cun aligning the 4 wheels in a 'near-perfectionist' wheel alignment shop which is very hard to come by .
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Alignment is ok i guess,it is going straight,but a bit goyang left right above 110,just changed new kyb excel g and myvi gen 3 15 inch rims and pirelli cinturato p1,195/55/15,current pressure 220kpa,do i need to increase pressure?
ktek
post Sep 19 2022, 11:40 PM

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QUOTE(Theeban @ Sep 19 2022, 10:52 PM)
Alignment is ok i guess,it is going straight,but a bit goyang left right above 110,just changed new kyb excel g and myvi gen 3 15 inch rims and pirelli cinturato p1,195/55/15,current pressure 220kpa,do i need to increase pressure?
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fren is using 235kpa on xm2 plus
ktek
post Sep 19 2022, 11:41 PM

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straight line we toe in a bit. very steady line
dudester
post Sep 20 2022, 08:56 AM

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A bugging curious question.
My car's recommended pressure is 220kpa for 195/55R16
Most of the time on the move the pressure goes up to 230/240

What is the OPTIMAL pressure to set? Have it at 'on the move' temperature at 220? or is the car recommended pressure taking consideration to run OPTIMAL when it goes up ?


zeng
post Sep 20 2022, 10:46 AM

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QUOTE(ktek @ Sep 19 2022, 11:41 PM)
straight line we toe in a bit. very steady line
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You hit right on the head of the nail, my friend.

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