Sorry, I was half asleep while writting the post. Your correct. I had it correct in the earlier part of the message, but somehow my brain went south on me in the second half of the message. I'll correct it.
Barn
Barn
CASTER: How much do you have? Why?
- Thread starter OLDE GUY
- Start date
Dave Hardy said:
Yes, toe in is positive, toe out is negative.
Top of the tire in is negative camber, top of the tire out is positive.
The front tires pushed forward is positive caster, the tires pushed reward is less positive.
There's one thing I can't understand after all my years of doing alignments. Why would a Type R integra have a caster setting of 1.15, and an older LS integra, not nearly the sporty drive as the Type R has a caster setting of 1.5? This goes against everything we've been talking about. BUT, the Type R Integra is clearly a great track car. It turns much better than the LS. I think it may have something to do with the LSD in the Type R. Possibly with the LSD in the type R integra, (which btw is a fine unit), causes the car to turn so much better that they had to take some of the turn in out to counter a possible oversteer into turns? The LSD in the Type R actually puts more torque on the outside wheel to push the front end around the turn. Makes sense to me. This is scary....you guys are watching my mind at work here.......sad.
Barney
CASTER: How much do you have? 8.7 degrees!!
I don't think that 8.7 degrees caster is excessive for track purposes. And of course if you look at my NSX with its wheels turned sharply, you can see that the tires are nicely leaning into the turn - a thing of beauty in my opinion.
Dave Hardy said:
I just spent three days on the track at VIR North and Full courses. I found that 8.7 degrees caster had no negative effects; I didn't experience oversteer. And with the 1.6 degrees of negative front camber, I found the front tires are wearing pretty evenly - not the usual excessive outer shoulder track wear. My NSX is quite stable at 134 MPH and brakes in a straight line. Also quite stable "trail braking" from 120+ MPH into and through a sweeping left turn down to 45 MPH for the immediately following 90 degree right turn (Turn 14 and 14a) on the Full course. Not squirrelly at all.NSXDreamer2 said:
I don't think that 8.7 degrees caster is excessive for track purposes. And of course if you look at my NSX with its wheels turned sharply, you can see that the tires are nicely leaning into the turn - a thing of beauty in my opinion.
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Ponyboy said:
Ponyboy - Unless you mean that your NSX has 4 mm of toe out on each side for a total toe of 8 mm, IMHO I don't think that 4 mm total toe out in front is causing the "tram lining" effect - following ruts. I ran that amount for a year and didn't notice that problem.
If you are using front tires wider than 225 mm or R-compound that may be causing the problem. I have Bridgestone SO3s 225x16 in front and they don't cause "tram lining". Or perhaps the caster at 10 degrees is the problem. I like the Zanardi/NSX-S alignment settings with a lot of camber although negative 1.6 degrees camber in front with the 8.7 degrees caster is giving me fairly even front tire wear.
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Barn Man said:
Yep, camber and caster have always had positive / negative attached to them. I've just never heard toe use the same convention.
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