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Thread: facts about road grip of new corolla

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    Default facts about road grip of new corolla

    to all corolla owners out there

    as u all know, most se saloons and altis owners have changed the original 14" tyres to 15" in order to give the car a better look.

    well i have 2 SE saloons in my office and have extensively driven both. one has 15" tyres while the other has original 14" tyres. i have noticed 2 marked differences between the 2. would like share it with u all.

    1. as u know corolla has a badr grip as it is, however the car with 15" tyres has a much more shaky grip compared to the car with 15" tyres. especially on highways the car 15" tyres does not feel sure footed and feels swayed by cross winds. the car with 14" tyres still has somewhat an acceptable grip.

    2. the acceleration of the car with 15" tyres is definitely slower than the one with 14" tyres.

    i cross-checked my findings with a technical person at toyota. he confirmed that this is the reason that toyota is not offering 15" tyres in corolla. he explained that bcz of the high-roof design, the car's centre of gravity gets affected if its fitted with 15" tyres.


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    agree with rim size makes a diffirence. tried 16" and 17" in ae-101,, 17" is better, even drove a mitshubitshi fto with 16" compared with 17" in corolla, still corolla gave stiff drive.
    ,,, unless you know the track, you're not good enough to sit behind the wheel." K T

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    thanks for the info. really helpful.

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    mazher says:however the car with 15" tyres has a much more shaky grip compared to the car with 15" tyres.

    mazher, can you clear this? its kinda confusing
    ,,, unless you know the track, you're not good enough to sit behind the wheel." K T

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    i think its time to lower suspension, if increasing rim size and using same height tyre. otherwise, it will end up looking like half jeep half car
    ,,, unless you know the track, you're not good enough to sit behind the wheel." K T

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    @mazher: did u mean wheels/rims or tyres?

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    @levin, well it certainly is close to a half car half jeep height if u park corolla next to kia sportage you would understand what i mean.
    -

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    new corolla is a definite crossover of a sedan and an SUV

    @ khashraf
    u r absolutely right about similarity with sportage.
    Keep a cool head and wear seatbelts!

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    @levin

    sorry yar. i meant grip with a 15" tyre is shaky than with 14" tyre. it a typing error.

    @robin

    i mean both rim and tyres. 15" tyre goes with a 15" rim.

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    ya
    simple 2
    say,
    v should not make any change unless it does not make a difference in performance,
    its simply guaranteed.
    & proven by Japanese, they hav strict rules regarding changes like these.
    For Riding Jackets & Gloves, Armors, Saddle Bags, Knee & Elbow Guards etc: https://www.facebook.com/PbcMotorSport?fref=ts

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    basic rule applies .. increasing height of vechicle by using diffirent tyre size and keeping suspension same will end in car giving totally diffirent response on road. already corolla height has been increased for pakistan use because we eat a lot, weight a lot, and drive on bumpy roads,,lol.(that donesnt mean i am fat.
    ,,, unless you know the track, you're not good enough to sit behind the wheel." K T

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    Corolla in Pakistan has higher ground clearence due to our road conditions such as speed bumps and pot holes. Try compare it with Corolla X JDM.
    www.projector-point.com

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    if u increase wheel size then use a lower profile tyre, so that gear ratio & speedometer reading remain same.
    bigger wheel means better gyration, provided.

    @mazher: probably what u experienced was due to the reason that u used 15" wheels with standard tyre profile, instead of low profile, making car unstable.

    use following link to calculate.

    http://www.miata.net/garage/tirecalcold.html

    it will also tell u about the speed difference/ speedometer reading.

    its a good idea if u could tell us about tyre sizes of both corollas.

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    @robin

    dude. thanks for your feedback. the tyre sizes of 2 corollas are as below:

    1. 185/65R14
    2. 185/65R15

    u r right. the tyre and rim was changed from 14" to 15" while keeping the same profile. what is your suggestion? what profile tyre should be used with 15" rim so we do not disturb the handling characteristics? please advise.

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    185/55 R15
    Keep a cool head and wear seatbelts!

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    Originally the engine/gearbox combo is designed for a specific rolling radius. You need to maintian the rolling radius whjile going up tyre/wheel size. Furthermore, your observations like most are rather illogical and you speak of remedies which have little or no impact on the rectification of the problem. You have a problem with braking, go for softer damping. The manufacturer caters to whats required by the masses rather than an isloated school of thought.
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    195/55 R15 suits well if stock one is 185/65 R14, means u r enjoying ride of saloon edition instead of 175/70 R14 of Xli/GLi, kahin ghaltee say Altis to nahi lay lee

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    How about the wind swaying the car away. soft dampers can help there as well? if yes then any part number u can suggest about dampers (Front/Rear or both).
    Keep a cool head and wear seatbelts!

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    I've never experienced buffeting of such a severe nature. The reason that i find this rather pechuliar is that you study the Cd(drag coefficent) of the both the Honda and the Corolla and they're more or less the same, as to why people claim it to be a taller vehicle, is beyond me. The car DOES have a higher waistline but other than that i really don't find it obnoxiously tall. As far as part numbers go, they've more or less eluded me, but the model code is TA-NZE120 - GEMNSP. Thats the G9 JDM by the way.
    Get dampers front (fornt/rear for a massive improvement) and the difference is a 60% increase in braking efficeny.
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    Thanx Bro. I will try to convince my father to get a swap for dampers, but he is the type who dont even touch the stereo/Radio after buying the car. He is still running those General Tyres

    He do get frustrated with its braking but he advises to drive slow rather then trying to get good brakes. ANyway that is the only bargaining point i have with him.
    Keep a cool head and wear seatbelts!

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