Hi shifus here, I need some advises from all the shifus here.
my myvi 2015 se 1.5 i feel so unstable when cornering in highspeed like 60kmph to 80kmph, so i been reading through all the forums and know that changing tyre really helps improve ur stability,
so here my question, Im planning to either stick with my own stocks rim size 14inch but get a wider tyre 185/60/r14 or upgrade my rim size to 15 inch 195/55/r15.
my main concern is on stability when cornering, comfortable ride on highway. and hopefully all these changes doesnt affect my FC.
thank you shifus for the advises and suggestions.

bigger contact area = more traction

more traction = more stable

there is no way you get more traction and get good FC and comfort ride

Upgrade to 15inch rim, more stable.

The best fit would be 185/55R15. Any bigger/wider and you will risk scraping your fender when turning

what if guys im just gonna stick with 185 60 r14 ? does it improve my stability on cornering too ? and cons side ?

pump extra air may help.

Go for 195/50/15 or 195/55/15 performance tyres

I m using 195/55 now for both my myvi and axia

If u want to use wider tires, u need 6jj width wheels to fit 185. Your original one is only 5jj width.

Upgrading rims & tires to 195/55/15 or 195/50/15 will give the most improvement in handling as you can use high performance tire such as Michelin PS3/Bridgestone RE003/Goodyear F1-D5. If using smaller sizes than that then you can only use low to mid-level tires.
The down sides are:
1. Of course you need to spend a lot more on tires and rims. One piece of those tires will cost you around rm200 or more.
2. They won't be as comfortable especially if using 195/50/15. If you use 195/55/15 then still quite comfortable but the diameter is a bit bigger hence slower acceleration.
3. FC might be just a tad more but IMHO is negligible and worthy trade off for the significant improvement in handling.
4. Those tires will wear out faster (around 30-50k km) but IMHO it's reasonable and again a worthy trade off for the significant improvement in handling. No point using tires that wear out slow but then they become hardened plus have lousy grip! (unless you're a taxi or Uber/Grab Car driver who drives hundreds of km per day!)

My recommendation is upgrade to 195/55/15 using 15x6.5jj rims. If still not enough stability, then you have to mod your suspension already (stiffer absorbers & springs, anti-roll bars).

thanks shifus, really learn alot from you. if there any way to improve my handling & stability without slowing down my acceleration ?? 185/60/r14 should can be fixed in my stocks rim rite??

rear anti roll bar.

Can fit, but can only use low to mid-level tires for that size, not UHP tires. Then you may want to mod your suspension to further improve stability (first recommendation is to add/use thicker anti-roll bars), then no sacrifice in acceleration but less comfort.

to me i dont think wider and bigger rim size improve much on stability
the car will still roll here and thr when you corner, which in return makes you feel unstable
i prefer doing suspension upgrade/mod if i am looking for cornering stability

Corsair, you need to be aware of the trade off before doing any modifications.

If you increase the size of your tires, you gain stability and your ride will look better but it will be less comfortable, consume more fuel and make it accelerate slower.

You could put performance bracing. It will make your ride corner better but the NVH will be worse.

Manufacturers spend a lot of time setting up the car to get the balance right. Honda tend to go for harder suspension to get better cornering while Toyota go for comfort at the expense of the cornering.

Basically, if you increase one thing, you will decrease something else.

More extreme enthusiasts will have a track car or an off road monster. Those cars have been modified for one specific purpose. They are unsuitable for driving on normal roads because of their modifications.

Good way to improve cornering stability is to add some stiffener bars. Especially like Myvi the hole of the rear hatch is huge, this should be the first place you stiffen. After that can look at the front struts, arb etc. Next can look into progressive springs if you want to maintain some comfort but get less roll during cornering. They're cheap to get at kereta potong and if you smile they'll let you try a few until you find one you like.

Increasing rim size will increase FC more than getting wider tires. Less comfortable too. Wider tires will increase traction more than a bigger rim size. Bigger tires will get you better traction during cornering but it will not necessarily improve how stable it feels. Myvi suffers from understeer and from my experience the rear upper bar helps the most. Also it is a very tall car, so for stability maybe you want to lower it or at least get a lower seat.

As for myvi ori absorber and spring, it good for city drive. More to soft setup.

Suggest to change the absorbers + sport spring. Definitely improve on suspension setup

change 195/55/15 rim+tyres + UR bar

My car mod
Tyre: 185/60R14
Rim: stock rim
Suspension: hlsh hwl adjustable
Bar: ur front struct bar & ur 18mm anti roll bar

Currently satisfied with this mod.
Totally can feel different from stock car
Can take corner more aggresive.

Between 195/55/R15 and 195/50/R15 for Myvi 1.5, whcih is the best fit ?

185/55R15

Sell Myvi, buy Iriz?

The Myvi needs serious mods, at which point you'll have given up on comfort (not that the Myvi was comfortable to begin with).

thanks all the advises , really appreciated it. i think im gonna change my absorber/spring and add on some bar on rear as well the front 1. tyre will do it laterrrr. thanks shifuss for helping.

is there any cons or disadvantages by doing this mod ? how do u fit 185/60 into your stock rim ?? how much total for this mod ?

This post has been edited by Corsair0418: Oct 31 2016, 09:33 AM

Advantages: i can take corner without worry
Disadvantages: i need more careful at speed bump and road pathole. Will damage below car
Total mod: for adjustable rm2k because new one. For ur bar i buy used one rm3xx.

I have driven at least 6 years with oem absorbers and tire size to say that even in stock form its quite fine really. Now Im on 195/55/15 with too much grip I think I heard the left mounting started to give a wierd sound. You just have to know which line you wanna take and the limit of your setup. If you used lowered setting and wider tires plus the stiffening and brake mod you'll hit the next barrier which is power. Then that 2k will not give you much satisfaction.

For me its more fun driving close to the limit rather than extend the limit. Myvi is not a sport car but trust me if you knows the car well and able to get a good line even within your lane its fun really. I never have a bad feeling about the body roll but in fact used that as a gauge or a point where you have to do something to prevent the rear whip.

Switch off the foglights will add 25hp.

If wanna less floaty mean I have to change spring and absorber ?

All good suggestions here.