Why is car under steering

[roastbeef]

the maestro redpriest doing the dance.

[kyrix1st]

Originally Posted by roastbeef

the maestro redpriest doing the dance.

That E36 is QUICK.

[Richbot]

Braking too hard + understeer = overdriving the brake zone then overdriving the corner, not really braking causing it, more like testosterone + LOFT

[roastbeef]

Originally Posted by kyrix1st

That E36 is QUICK.

E46. He is a quick driver with a ton of experience.

[redpriest]

Originally Posted by roastbeef

E46. He is a quick driver with a ton of experience.

He's probably talking about the e36 m3 sedan in front of me. Yeah he is. It's not even a motor swap - his car has had a lot of weight reduction (I think his car weighs < 2700 lbs) and he'll actually pull on me on a straight.

[redpriest]

Originally Posted by italyix

Just got back from running Streets of Willows with OnGrid this past Sunday and was experiencing bad under steer, and am trying to understand why.

My set up is:
Falken Azenis
Front 285
Rears 315

Brembo 380mm bbk front and rear
Endless pads

US MDM

Camber is 3.8 front and 3.2 rear

Running a front GTS style splitter also

Best time was 1:30, my friend ran a 1:28 with my car as well

Any thoughts as to what is causing the under steer? I was also over heating the front brakes, I think the mdm was kicking in waaaay too early and causing issues

I should also add that while the rear tires were being used to the fullest, as the wear marks were spot on, the fronts were scrubbing and not hitting their wear marks. Too much camber?

You'll find I think, that's just the nature of Streets. Having just come back from there for the second time ever, was experiencing understeer in quite a few corners, especially turn 8.

It doesn't seem to be a very good grip surface and it's very bumpy making it a challenge for your suspension.

I did 1:28 once in my e92 when I was relatively new to driving it - maybe 6 or so track days of experience. That lap with MDM is here:

[kyrix1st]

Originally Posted by redpriest

He's probably talking about the e36 m3 sedan in front of me. Yeah he is. It's not even a motor swap - his car has had a lot of weight reduction (I think his car weighs < 2700 lbs) and he'll actually pull on me on a straight.

Don't worry, you are plenty quick. Were your tires old/worn? You seem to lose a lot of rear grip through S corners..

[1MOREMOD]

You go too fast when you turn

[redpriest]

Originally Posted by kyrix1st

Don't worry, you are plenty quick. Were your tires old/worn? You seem to lose a lot of rear grip through S corners..

RE71R tires that had 2 track days at chuckwalla previously. I go through these tires like candy - I get 3 or 4 track days out of them if I'm lucky. The fronts are completely torn up - no tread pattern left on the outer half.

[M3 Number 86]

Originally Posted by roastbeef

the maestro redpriest doing the dance.

You should've seen him try to do skidpad with worm Pirelli scrubs in the back

[redpriest]

Originally Posted by M3 Number 86

You should've seen him try to do skidpad with worm Pirelli scrubs in the back

Nobody wants to see an idiot driving around in circles lol

[M3 Number 86]

Originally Posted by redpriest

Nobody wants to see an idiot driving around in circles lol

[scrammer]

Many drivers think it's full throttle then full brakes but "Trail braking" involves easing off the brake pedal so as not to let the car understeer, while still slowing it enough to make the corner.

"When approaching a corner, it's common practice to give full braking in a straight line. Trail braking begins when turning into the corner while at the same time easing off the brakes, but still applying enough pressure to make sure you don't fly off the course. With the right pressure applied, the car will balance out, and you'll make it through the turn. Add too much or too little, and the car will begin to push or understeer."

[z3papa]

Originally Posted by scrammer

Many drivers think it's full throttle then full brakes but "Trail braking" involves easing off the brake pedal so as not to let the car understeer, while still slowing it enough to make the corner.

"When approaching a corner, it's common practice to give full braking in a straight line. Trail braking begins when turning into the corner while at the same time easing off the brakes, but still applying enough pressure to make sure you don't fly off the course. With the right pressure applied, the car will balance out, and you'll make it through the turn. Add too much or too little, and the car will begin to push or understeer."

I use the slang reference for this as "sponging off the brakes". It essentially allows the car to continue to take a set.