Hello everyone. Road Races are barely going to start in march and I've never done any before. Im wondering how big a problem understeer will be without an upgraded suspension. Im eventually going to upgrade but for now Im just sticking with the stock suspension. Here is a little info on my car. Ive upgraded to the fp green, hks cams, all bolt ons, 18x9.5 rims with 265-35-18 tires.

So how big of a problem will understeer be for me until I upgrade the suspension. Will it be worse with more power or will it be a little better since it will be putting more power to the rear wheels now?

 

So you have a RWD Evo...?

 

no comment

 

It'll be worse with more power. And unless you've modified the rear diff or center diff.... which I wouldn't recommend for a newb. How much experience do you have if any?
The stock suspension - as has been stated 100's of times - is more than capable for beginners.

How safe a tune do you have? Assuming you have a tune for the new turbo and all, but does it factor in an extra margin of safety for the track?

Since you've added a good deal of power, I hope you've upgraded your brakepads and fluid? Extra go means extra stop! What tires are you running?

 

poor choice of words? or your evo became RWD? lol

 

I doubt you're going to road race. Most likely do DE or TT. Just take it out and see. The understeer won't be terrible, just learn to manage it. You really are asking the wrong questions as you might tell by the caliber of answers you are receiving. Hint: This subforum is not very forgiving of posts like these.

 

When i said more power to the rear wheels, I just meant more power to the crank also equals more power to the wheels which include the rear wheels. I was assuming that more power to the wheels would help with oversteer but i guess i was wrong.

Like I said eventually Im going to upgrade to swift spec r springs with bilstein hd but for now I was just wondering how bad the understeer would be.

O and I have upgraded brake rotors, ss lines, and track pads as well.

 

More power to the crank equals to more power to All wheels.
Just because you have more HP at the crank doesn't translate the power will be distribute differently... in your case more power to the rear wheel.

Just imagine you have a FWD car... when you throttle it in the turn.. what would happen? The car would push, that's what would happen in the Evo with the stock suspension setup.

 

Thats not what I meant tho. I know the distrubition does not change but the rear wheels are still getting more power over stock so I thought this would cause more oversteer, I didnt mean that the rear would be getting more power than the front. So what is the distrubution ratio of power to the wheels. I thought it was 50/50?

So whats the best way to overcome this understeer minus the obvious changing the suspension. Taking a corner is it best to let the car push all the way through and stay steady on the gas, or let off the gas and reapply when the exit angle is correct.

 

the evo naturally understeers...I understand what you are saying above however would you be able to control such a setupe efficiently


you should look into an aftermarket ACD ecu unit...that might help you a bit. especially if you are going with swift springs and bilsteins. you should also check out the roll center adjustment if you go that route (whiteline)

 

I dont have ACD in my evo. I have an VIII

I have enough money to afford the swift springs at the moment but would it be wise to get the springs now without upgrading the struts? Thats why Im debating on just waiting. But since I know with my mods I will be placed in a faster class I want to be as competetive as possible so if just springs will add more performance I will just buy them now..

 

You say you get it, but I don't think you do. You could just as easily say "I know the distrubition does not change but the front wheels are still getting more power over stock so I thought this would cause more understeer".

Like you've said twice now, more power is more power to the rear, but don't forget it's proportionally more to the front as well. Don't think that because you dumped a lot of engine mods on your car it won't understeer. Evos push naturally. You haven't done anything that would correct this.

 

over steer shouldnt be a problem. the 60/40 split is great for handling. if anything you will prolly lift around the turns being new to it all and the car will than oversteer.

 

It sounds like you are unfamiliar with the Evo's behavior.
The following link will help you to stay out of trouble at a trackday.

http://evoempire.org/Driving-Techniq...-Ama-t678.html

 

It will be fine, you are talking like it will crash if you understeer. It won't. The Evo is very very very forgiving. If you start to understeer, gently let off the gas and push the brakes. Keyword: gently. Always be smooth. You are in a very heavy car that like to have the body roll under pressure with stock suspension. If you hit the brakes hard, the car can oversteer pretty quickly.

That is another point though, you can mess around with changing the balance of the car (by sudden throttle or braking changes) and see if you can get it to drive the way you want. Mine would oversteer perfectly if I left off the gas real fast, or gave it a quick hard tap to the brakes and got back on the gas. Be careful with doing all that though, as it can make it oversteer out of control if you aren't. I drove a friend's car on track that had about 380 whp, decent street tires and stock brake pads. It was insane. I'd have to brake SUPER early. So be careful there too. All the people who have highly modded HP monsters that start thinking about going to the track are crazy IMO. A 380 whp otherwise stock Evo with street tires is going to be a handful at the track, so take extra caution that you know the rest of your car isn't up to containing the hp.

As a benefit to that though, the friend's Evo I drove on track would oversteer beautifully with sudden application of the throttle because of the high hp. The power would go to ALL wheels, but the front would hold fine and the rear would come lose.

Messing around with tire pressures may help as well. So will making sure you rotate worn tires from the front to the back so the rears are more warn out.