Dunlop SP9000's day one...

[jdbubb@ix.netcom.com (Dan Bubb)]

I dont' get it! The factory recommends 27 PSI front/rear with 175/70 x
13, so you install a wider tire with a much stiffer side wall and jack
the pressure up 30%?
Has anybody seen a plot of slip angle vs. lateral load?
A 205/40 X 16 produces a higher lateral load at a smaller slip angle
than a 175/70 X 13. Increasing tire pressure reduces slip angle for a
given lateral load. Maximum lateral load may increase slightly.
Continuing to increase tire pressure will continue to reduce slip angle
making the tire's breakaway  characteristics more abrubt. (Just the
thing for street use!) Also, at some point increasing tire pressure will
DECREASE maximum lateral load.
36-40 PSI is good for autocrossing where if you don't run high pressures
you'll be riding on your sidewalls. But, running at those pressures will
give you a tire you can easily overdrive if you aren't used to it.
Again, I wouldn't want to tell anybody what to do, but 28 PSI gives me
all the responsiveness I need on the street with a 205/40 X 16, even
tire wear with aggresive driving and it has a decent ride too.
Dan


Josh Hignight wrote:
> 
> I've had sp8000's before, but not on this car. Being that they were totally
> different cars, I'd have to say that the 9000's are a LITTLE (itty bitty)
> bit less grippy than the 8K's (could be tire pressure, I've got the 9K's at
> 36 right now. May go down to 34 or up to 38). BUT, I am totally satisfied so
> far (it's only been a day remember). Granted, if it was even remotely moist
> outside, I wouldn't even consider driving on the 8K's, whereas the 9K's look
> like they will do fine (for a performance tire that is) in the wet.
> 
> And yes, the 9K's are on the front. Rear one's coming in 2 weeks.
> 
> Joshua Hignight
> Student Services/Technical Services
> New Mexico Campus
> (505) 821-4800
> 
> -----Original Message-----
> From: Matt Coates [mailto:bencoates@yahoo.com]
> Sent: Thursday, January 17, 2002 12:53 PM
> To: Josh Hignight; 'scirocco'
> Subject: Re: Dunlop SP9000's day one...
> 
> sweet dude!
> 
> did you mention before that you've had sp8000's?  If so how do they compare?
> are 9000's on the front?
> 
> Thanks,
> Matt
> '87 16v
> --- Josh Hignight <Josh.Hignight@phoenix.edu> wrote:
> > For those interested, I ordered the Dunlop Sport SP9000's on Monday, they
> > arrived yesterday, and I had them installed yesterday evening (credit to
> > Discount and TireRack's working together).  $264 and change total for 2
> > tires, shipping, mounting and balancing.
> >
> > The 9000's, after about a day, seem more communicative of what's going on,
> > stable at all speeds, and the car feels much more controlled and capable
> > than ever before. They also ride MUCH smoother than the Nitto's, at every
> > speed.  So far...  me likey!
> >
> > Joshua Hignight
> > Student Services/Technical Services
> > New Mexico Campus
> > (505) 821-4800
> >
> >
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