understeer over the shallowest puddles on highway
 

car: scion frs all stock with uel & q300 , stock tires(worn threads)

So, i was going on the highway about 65mph, and the highway starts curving to the right and it was raining. I see few puddles just streaming across the highway, not deep at all, less than 1 inch. And there are like 3 streams just going across the highway about 2 foot wide. As soon as i go over each puddle, i feel the car understeers and goes straight till i get over the puddle. Does this happen to others as well? or is it just my tires dying on me. It's pretty sketchy feeling, since this never happened to me driving other cars.

This ^
Drive to the conditions.
/thread

Welcome to ye ol forum, msaikhan - :clap:

Well, what you are experiencing is most likely due to a combination of warn tires and a relatively light car.

The "fix" is to get new tires and then slow down when you see water puddled (streaming) over the road. If it sneaks up on you, don't try to compensate, just ride through it.


humfrz

Get good all season tires and this will greatly reduce this effect. The stock tires are crappy summer touring tires. They're terrible in wet climates, well really just terrible all around.

I rolled on 245 wide DWS06 and drove through an incredibly wet winter here in Oregon without issue. Usually wider tires mean more hydroplaining - having good tires make all the difference.

Though I've read countless reviews espousing their rain performance, I have a lot of sketchy moments with my Super Sports. Any all season tire seems to handle better in wet conditions.

Stock tires which are terrible in wet to begin with, plus they're worn? Yeah, you're gonna have a bad time doing 65 mph through puddles. I changed out my stock tires after I fishtailed on a turn on wet roads when the tires were basically new (<5k miles). Had plenty of space to correct safely but I still came away from it feeling like a different set of tires would have held the corner under those conditions.

You've already answered your question :lol:

Stock tires are bad in heavy rain as it is, but being worn exacerbates the effect of aquaplaning.

If you want summers that perform well in the rain get Michelin Pilot super sports


If you want ok performance in heavy rain, very light snow and dry with a trade-off to a bit of handling get some all seasons

Assuming "threads" means "tread," I think you're very close to discovering the answer.

It's the exhaust, right? I'm pretty sure the exhaust is causing this.

Yea, Aquaplaning

that's weird. My MPSS are ridiculous in the rain, can keep on trucking at the speed limit when people are slowing down to 45mph. 215s on 17x8.

Same spec as mine - I do have a good 25k on them. :burnrubber:

Weird that MPSS come up in a conversation about hydroplaning as a cure for it. Did a couple 360s on wet road on my MPSS. The car would slide around super easy in the dry too like it was wet out.
I wouldn't recommend them at all. I even took them off before they were worn because I didn't want to wrap the car around a pole or slide into somebody. At I think 12k, they were taken off and still had
maybe a couple thousand more miles left on them at best. Maybe I had Chinese made replicas?