MatteBLK

Currently running with Skunk2 pro c coilovers fully stiff, the only movement is air in the tires, sitting on 0 offsets with Ironman Imove 195/45/r15 400T slightly tire stretched.
Tires are 6mm still way within tread depth running at 35psi front 33psi rear.

The front tracks perfectly fine, issue is that currently I am getting some rear end drifting.

The reason why I did a slight small stretch was due to was getting tire fold threw turns, slowing me down.

But with as far as the rear end anyone got ideas? no strech? Lower psi? Different set of tires? Street legal or not besides slicks, tire/rim sizes?. (Will just put non legal on another set of rims)

That or maybe some downforce such as a spoon wing?

Btw. just to clear the air, my car is not going for style awards, just autocross. And its gutted besides the dash.

childishthing

First off, I think there's a sub-forum for this type of topic. To answer your question, consider tires with more grip, a slight amount of positive toe in the rear, negative camber in the rear or balancing your camber up front, or adjusting/adding vehicle ballast... all just ideas/options, not recommending that you do ALL of them. I'd start with the easiest which is tires with more grip in the rear.

Black R

There's a lot "wrong" with this setup for Autox.

What spring rates are you using?

What swaybars?

Tire selection is key - but a gutted hatch would go straight to a prepared class or DMod and get stomped on.

If this is just a fun car and you don't want to be competitive, then at least go with something closer to +40 offset, that way your car is more narrow and can make it through slaloms and gates faster.

Anyway, good luck with Autox - it's a lot of fun and very addictive.

In the future you'll get more help if you ask these types of questions in the rrax section.

Matt_EH3

A lot of data is missing here if you want us to help. There is more to handling than just wheel offset, width, tires and your shock rebound setting.

Resolving a tire fold issue by stretching is a bit questionable IMHO, so there may be work to be done to the front still. Anyway, you cannot simply adjust the front, then the rear or vice versa. It's all a matter of F/R balance.

In a gutted hatch, keep in mind that you are likely to always have some amount of oversteer no matter what you do. You normally have to deal with it by adjusting how you drive the car (perhaps get on the throttle earlier, etc.).

But yes, you would get more help in the other forum.

tony_2018

This. Information is missing on your suspension setup, which has everything to do with how your car corners on the track, tire size as well.

TomCat39

Moved to the AutoCross section.

Once you provide all the missing information, you'll likely get much more in depth info here.

Shinny

Sounds like your shocks are set too aggressively. Would really help if we knew the alignment also. If the shocks are too stiff the inertia forces on the car aren't transferred into pushing the tires into the ground. Improper camber can also cause this. Body roll isn't the enemy you just have to make sure you get the right amount.

MatteBLK

I might be able to have a look today if I swing by my shop, will post out the rebound settings later, as far as alignment I know for a fact my toe is 0ed by me when I did my outer tie rods, as far as camber can't remember other then there was a race alignment done. Due for another alignment next month will find that out then. Engagement broke the bank lol, women like diamonds lol.

MatteBLK

Though also don't get me wrong it feels as if I'm pulling almost two g's but feels as if there's more. As in regards to the throttle idea, I'll give that a shot.

Timmerrr

If you soften up the rear shocks you should be able to get more grip out of the rear of the car. If you don't want to do that try lowering the air pressure in the rear tires.

Egezzy

iTrader: (2)

"Spoon" spoiler might help, but that'd just be a band-aid.

There seems to be a lot "wrong" going on. A 400 treadwear tire isn't really made to go autocrossing, in a sense. I'd raise the rear PSI, they're probably not getting any heat in them.

Full stiff isn't the answer except for the night of your engagement.

"Slight stretch, so the tire doesn't fold through turns and slow me down.." Doubtful, just because it is friction, it doesn't mean that it is slowing you down. It "could" be giving you more grip...

donut.

Almost 2 G's on 195/45/15 400utqg's eh?

Did you mean .2?

Matt_EH3

I think he mentioned it was butt G meter measurements. Pretty bad measuring tool, which usually over estimates. That or data loggers with built in G meters are very inaccurate and should read more G's.

testify

OP, when you want the car to stop oversteering, hit the throttle.

When you want the car to start oversteering, lift off the throttle and/or hit the brakes.

Do some reading on lift oversteer and trail braking. If you aren't proficient in those two driving techniques, you can't autocross a FWD car.

Though less than ideal, nothing in your setup should cause the car to be too much of a handful. It's likely a operator issue.

Xian

:sigh:

I'll +1 to the biggest problem likely being the driver. Aside from that, please post up:

Camber specs (you can even use a smartphone app for rough #'s)
Front/rear spring rates
Front/rear bar sizes
Front/rear shock settings
Front/rear ride height

Are you riding on the bumpstops at either/both ends?

chad

i fear this is a hella flush car.....aka stance tucked with the tire selection.....

your verbage gives me the impression you don't have a clue as to what you are doing.

i want to see result from said autocross and this isn't spirited canyon driving.....

i my gut says i should lock this thread down!!!

Matt_EH3

Yeah. Fixing a tire fold issue by putting on a stretched tire is just does not make sense. OP is stopping a sidewall angle issue by using an angled sidewall.

Also, how many stretched tires do you see at an autocross event?

Xian

I dunno... I ran 225 Rivals "stretched" on a 15x9".

testify

There are a lot of people that believe a stretched tire is faster.

I've heard one of the ST Civic tire experts say the 195/50/15 R1R needs a 15x9 to be at its fastest.

I don't subscribe to that nonsense, but there is some data behind it.

I think there may be benefits on courses that are purely or primarily transitional.

mdb4879

From what I can tell, it goes something like this: Slight stretching provides additional sidewall support, allowing for low tire pressures which make a larger contact patch. A 225 on a 9" wheel will be faster than a 225 on a 7" wheel, but that's not to say that a 245 on the same 9" wide wheel wouldn't be faster than the 225. I see STR Miatas stretching 225's on 15x9's, and a 205 even looks a little stretched to me on a 7.5" wheel.

But I think his tire folding issue could've been resolved by greater tire pressure or some more negative camber.