the sp00m 2L race spec PY ITR kicked some major 455!
it had 225/45R16 F & 195/55R15 rear tires. The vdo didn't state the sus set up but I'm guessing it's 18Kf/16Kr according to the sp00m's website.

Assumming this is true and that the RealTime guys are using about 14Kf/20Kr springs w/ same size tires on front and rear, I wonder what the better set up is?

-lot stiffer sus in the rear w/ same size tires front & rear
or
-slightly softer springs in the rear w/ narrower tires in the rear

Maybe it doesn't make a difference, b/c they both accomplish the same end result...increased slip angles?

This question may not take all factors into account, but I just thought it was interesting in the differences of sus set up between the US style and JDM style.

yoshi - who finds these kinda things interesting

 

16's in the front and 15's in the rear eh?? Hrmmmm.....Weird!!!!

 

when yoshi goes cruisin' for jailbait, he puts the 16 year old h00chies in the front, and the 15 yr olds in the back, too. crazy JDM-style!

-k-b0t, who doesn't really have a crazy honkay style..

 

dammit k3! why j00 have to go an tell da whole board about my weekend activities?

yoshi - who'll have to find a new hobby now

 

haha, that would be a kick to see... 16's + 15's... ultimate JDM stylo. do it, do it, doit doit doit!

 

Yoshi - THANKS !!! The VDO is AWESOME! I owe you one big time.

-Cos is extremely happy!

 

Gansan is nuts! Now all I need is HIS JOB!!!

 

A minor point, but slip angles are generally tire-specific.
As far as the funky JDM wheel/tire combo ... I Dunno. Whatever works I suppose.
However, on my nice little "jaunt" home from Ohio yesterday, I realized that my suspension setup still leaves room for improvement (maybe I should just slow down .... nahhh).

 

If you think about it, all the GS ITRs with their 225/205 combo are using the method preferred in Japan. I think I'll stick with this method, it works well enough.

 

c00, glad it got there okay

yoshi - who has some more g00dies that should be coming from JDM land s00n

 

I mentioned this in the competition forum, but I found out that Sp00m's springs rates I mentioned at the top was wrong. It's actually STIFFER 22K f / 20K r

 

JDM style is like that........the Top Fuel one use 17' in the front and 15' in the rear


[Modified by ITR111, 9:10 PM 8/27/2001]

 

Hoary Stiff!





[Modified by apexii, 4:47 PM 8/27/2001]

 

They use this to get rotation in the rear because that's the only way that they can. Stock ITRs don't come with stiff enough springs/shocks to promote oversteer, and with 225 out back the rear would just stick too well. However, add some stiffer springs in the rear and 205s might/do give too much rotation.

 

there are many ways to achieve the balance one would want in FWD. i mentione it previously, Japanese track are usually in much better condition than US. they have glass smooth surface and we have bumpy tracks in general. you can use a variety of tricks to balance the car, that includings different tire size, wheel offset, tire compound (lot of choices in Japan, very little here)...

in US nearly all FWD racecars are setup with stiffer springs in rear than the front. almost all uses same size tires all around (part of it is regulation)... with that said, will these so called japanese race suspension work well here? maybe it well, maybe it won't.

 

guess it's up to me to try it out - huhu

yoshi - who will try out a JDM-like set up but not the supa stiff springs like sp00m

 

Well the comparrison to the GS ITRs is a little warped...I say that (having been a GS ITR for a few years) because what we do with the differential tire size in GS is to rotate the car in relatively slow and tight Solo2 courses. I dont think many GS'ers would think to run the same set up on a high speed road course, you're more or less asking for trouble with THAT much ability to rotate.

Just my opinion

fais

 

Are the Bridgestone RE-O540 sold in Japan only? Anyone know?

 

i think so. They're not available thru the usual tire stores. Can prolly get them thru specialty stores though.

yoshi - who's scared to find out what they'd charge for special order

 

I use the same setup on our road course here in Hawaii and the only place the car gets a little hairy is going through the high speed chicane. But that's why you never lift off the throttle, no matter where the rear of the car is trying to go.

 

the RE540 semis are available here in Australia too