Road Racing Thread

[Advancedynamix]

I got it to work! This run was pretty clear, there was only 1 car that I lapped (newest generation civic si) and then at the end you get to see what happens when street tires get too hot and lose all grip. You can see them slipping and going away the lap before I finally flung the car off the track. I should have taken that as a sign to slow down, lol. Please pardon my poor hand positioning, it's always been my weak point (hard to correct bad habbits). Front straightaway speed was around 105-110mph. Keep in mind that this is on 185mm wide street tires that were made in Hong Kong!

Enjoy!

http://www.youtube.com/watch?v=a8lCA8k2qXU&feature=youtu.be

[DriverOne]

I can't complain about the hand positioning at all. That's almost how I hold my steering wheel. One thing that I did notice was that once you started to lose grip, your steering ratio became your worst enemy. There's got to be a better car to take a rack from!

[festivafeva]

i almost crapped my pants just watching you tip. looks like a lot of fun though!

[DON SVO]

Go hard in the paint! ...or at least powerslide through it and post the video!

[zoom zoom]

Haha, thru the whole video I was waiting on it to tip, then at the end you hit the gravel and I was like ..oh, I missed...NOOOOo...whew that was close!

[Flyin4stroke]

You almost "tweaked' the whole passenger side.

[ELUSIVE]

The rear is done with alignment shims.

Pics? Id love to see how you've set it up. I considered shims or wedged spacers to get some negative camber in the rears but upon modelling it seems when suspension is compressed that negative camber would turn into negative toe?(if my calculations are correct) which probably wouldnt help with under-steer. If anything positive toe in the rears could do wonders for turn in, but straight line would then be unstable.. Argh! My brain hurts

[ELUSIVE]

Love the vid btw!

[Advancedynamix]

Thanks! I'm glad you guys enjoy this thread!

You are right that negative camber turns into toe in with compression of the rear suspension. This is why the trailing beam rear suspension is by far the best suspension system for lightweight front drive cars. When tuned properly, a trailing beam will provide 3 wheel steering!
A rule of thumb is, toe in in the rear for stability ( generally up to .250") toe out for "turn in" and to promote rotation ( useful for low speed performance as needed for autocross). Always set toe and camber after ride height. Moog makes the shims, they are available everywhere. Here's a picture.

[Advancedynamix]

Another note. The settings I'm giving in this thread won't work well for autocross, and settings that work well in autocross are scary at close to triple digit speeds. Road racing and autocross are two different sports, and car setup is vastly different for each.

[ELUSIVE]

That's cool, when I eventually finish my build and have a chance to tune everything it'll be orientated to circuit/time attack. Forgive my ignorance, moog is a brand yeah? Ill google them now, hopefully "everywhere" will include oz

[ELUSIVE]

found moogs site, and apologies for hijacking thread too.
Do you know if those shims (part no. ?) will fit aspire beam?

[Advancedynamix]

Yeah, they are universal. Type in " aspire alignment shim" on eBay. No worries, it's on topic of road racing.

[ELUSIVE]

Thanks heaps mate, if I find some I'm gonna order them tonight! I take it I'll only need one for each side.
Oh, and I'm looking forward to more track action!!

[festyfreak39]

thanks for that!!! ive always wondered how to get toe out in the rear with a bit of camber!!!

GENIUS!!!!!!!!!!!! (or maybe im just slow)

Nice video btw, More festy guys need to take their cars to time attacks rather then just the 1/4 mile!!!