BenR

iTrader: (2)

If you have pronounced and miserable understeer turning in only one direction, while the other direction feels great, you have something else going on.

spoolin2bars

iTrader: (1)

not necessarily. if your corner balanced it should steer roughly the same in either direction. corner balancing doesn't mean the weights are gonna be equal at all corners. only that the lf & rr , and rf & lr are similar in weight.
which means you could have 150lbs. lf / 50lbs rr = 200lbs.
then 125lbs rf / 75lbs lr = 200lbs. and hypothetically have similar steering left or right. in this example the lf has more weight than any corner, but it shouldn't steer differently. what could, especially at that track cw, is higher temps from all the right hand turns. it could raise the tire psi, more on one side and that could affect the handling. on jakes car we ran 2psi less cold on the left and after the session they were all equal.

hustler

iTrader: (6)

This Mark Ortiz stuff is awesome.

BenR

iTrader: (2)

If you haven't already you should subscribe to racecar engineering, if for nothing else but the ****.


http://www.racecar-engineering.com/


This is supposed to be a very good book. A bit heavy on the maths, keeping your college texts nearby would be helpful.

http://www.millikenresearch.com/rcvd.html

cueball1

iTrader: (13)

Holy crap he's got a lot of information. I figured it would all be FWD stuff since they run Hondas but it's not. Definetely worth spending time looking through.

sjmarcy

Mark's a Racecar Engineer / Consultant. I think those Honda guys are just storing some of his material on their site.

Seriously guys…at first some enthusiasts buy a cool car…many do some bling mods…a few do motor mods…some learn to drive…some modify the suspension…combinations. There are many ways to enjoy automobiles. If you get into track / autocross, it really pays to learn the fundamentals of suspensions and handling, keep records, try to improve your setup, datalog, make parts, video, read, discuss.

Miatadotnet is pretty much for everybody…CR more for the bling/slam crowd…this place (to me) seems mostly about the motor, engine, boost etc (which makes sense given the forum name and the interest of many posters). It's nice to see a few here showing interest in learning more about suspension and handling rather than the latest boost mod. After all…it's not hard to hold the gas pedal down

Now…Mark is mostly used to dealing with experienced and pro drivers. I point this out because some enthusiasts leap to making all sorts of changes to their car to get rid of problems the car may or may not really have. You can really get lost if you go down that path. It's pretty common.

See…the driver can experience a car and then when trying to produce a good result may need to develop a driving strategy which may or may not be as expected. Since they will do things like take different lines, enter corners certain ways, give it up in other places than others. That's part of how the SM guys can produce quite decent lap time results on about any track.

BenR

iTrader: (2)

So the point of this post is to yet again claim you know a lot and we dumb powerheads not only don't know much, but can't drive, and we should be glad you're part of this forum? Way to stick on topic.

hustler

iTrader: (6)

Again, rather than contribute to the thread, he "listens to the sound of his own voice". He also fails to notice that roughly 100% of the fastest Miatas in the nation are on this board, and we didn't get here without fundamentals.

Savington

iTrader: (31)

Go ruin a thread on M.net with this crap. Race Prep is sacred ground and you're incapable of doing anything except shitting all over it.

Gotpsi?

iTrader: (5)

This section is mainly for those who run faster times than spec miata, and who think out side of the box, not those who drive what comes out of a box.

curly

iTrader: (25)

Have you tried this?

http://www.flyinmiata.com/projects/OTC/race.php?day=5

Savington

iTrader: (31)

You have to be careful with generalizing all right turns too. I spent some time trying to figure out why the black car wouldn't turn in for T10 at Laguna, until I realized that it was perfect everywhere else and T10 just naturally causes understeer from the terrain.

flier129

iTrader: (7)

It is coming down T11 at Road Atlanta!

hustler

iTrader: (6)

Yes, my tears result from one corner. The difference is that 17-year-old children in $$$ SM's were trouncing me through here and I could not go fast on the rest of the track due to the tears clouding my vision.

What did you do to add some speed in this turn? Hotter entry and harder trail brake?

Savington

iTrader: (31)

Yep. Move the braking point up ~75ft and ride the brakes the whole way through turn-in until it's basically over-rotated. There's so much camber in T10 that if you don't over-rotate on entry, you'll be fully hooked before the apex and pushing on exit. I got through there fast one time at my last Laguna day, and the steering wheel was straight the entire time.

hustler

iTrader: (6)

So today, I read this and it blew my mind
http://www.eviltwinmotorsports.com/w...ter-2006.6.pdf :
I'm suddenly unsure which way to turn the rebound ****.

hustler

iTrader: (6)

This feels applicable to my thread. Man, I'm getting to a point where sometimes I feel like I'm overdriving when I do stuff like this, but people like you agree it's faster. I do something similar at Hallett at #1 and #5, MSR-C CW through the triple apex, and now MSRH Sugar and Spice. This is specifically pertinent to Hallett where some of the DFW crew attempted to give me advice, while they're 5-seconds behind of course.

hustler

iTrader: (6)

A damper's job in high shaft speed is to keep the tire on the surface, and in a perfect world over bumps with no change in load. What is the damper's job in low speed, glass smooth weight transfer?

I know low-speed compression is there to control roll to the magical number that works on every track, but what does rebound specifically do?

I'll ask questions later about the gray area between high and low speed, and the magical shim-stack transitions from high to low. This is getting scary, I may want 3-way adjustables soon.

sjmarcy

Yup, I'd do the same. By getting more rotation earlier on such a turn, mid and and corner exit understeer and steering lock is reduced, and powerdown can be earlier. This is a key autocross driving skill too BTW. Combine with well timed throttle kicks for alien driving at those speeds. It helps alot to have good brake bias here.

hustler

iTrader: (6)