32 is a good point to start.
IMO, you want to get to 38-40 hot off the track.
Late Sept, in 60 degree ambient I started at 34/32 F/R and had to bleed off air as I cam off over 40.
Do you have a street alignment or more camber? How much?
When I was at VIR this summer - hi- 70's/lo 80's I started at 32 and ran them up over 40 ... also found that I didn't have enough camber and was heeling over, using the outside of the tire more and not getting full tire.
FWIW
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^VIR Turn 3 '08^-MungoZ06-'03 QS/ModRed - NCCC, NASA NCM Member - Z06 Fest IV,V,VI,VII
32 is a good point to start.
Do you have a street alignment or more camber? How much?
Half way between a street and a track alignment. Unfortunately I had it done about 2 years ago, and like an idiot, I forgot to write the numbers down. But I'm thinking it's like -1.25 front. Might have been -1.5 though. Can't remember rear. -1.0 maybe?
Quote:
When I was at VIR this summer - hi- 70's/lo 80's I started at 32 and ran them up over 40 ... also found that I didn't have enough camber and was heeling over, using the outside of the tire more and not getting full tire.
That was with stock alignment?
This going to be at Pueblo. Is that a fairly bumpy track? I'm also considering 2004 shocks, since my original ones are getting up there in the miles by now. I gather there's no alignment changes just from 2002->2004 shocks? Or do I need to have the car aligned again?
My alignment setting before going to track was -1.2 front; -1.0 rear ... HOWEVER ... when I went in for a subsequent alignment (after VRI and WGI) we found my left side (most loaded on conventional track direction) had shifted back to 0 or worse camber! ... so I MAY have been running that way at VIR ... accounting in part for the heeling over ...
Quote:
Originally Posted by novetteyet
... This going to be at Pueblo. Is that a fairly bumpy track? I'm also considering 2004 shocks, since my original ones are getting up there in the miles by now. I gather there's no alignment changes just from 2002->2004 shocks? Or do I need to have the car aligned again?
Don't know about Pueblo ... Jim Lembo can tell you ...
I put 2004 shocks on this spring ... noticeable difference for me
No need to re-align based on shock change alone.
My alignment setting before going to track was -1.2 front; -1.0 rear ... HOWEVER ... when I went in for a subsequent alignment (after VRI and WGI) we found my left side (most loaded on conventional track direction) had shifted back to 0 or worse camber! ... so I MAY have been running that way at VIR ... accounting in part for the heeling over ...
Wow. Do you think that's a general problem, or something specific to your car? Maybe I should have mine re-aligned. It's been a few years. No track time, but some hard corner-carving here and there.
Glad to hear about the 04 shocks. I definitely plan to upgrade.
Wow. Do you think that's a general problem, or something specific to your car? Maybe I should have mine re-aligned. It's been a few years. No track time, but some hard corner-carving here and there.
Glad to hear about the 04 shocks. I definitely plan to upgrade.
thanks!
I would say that alignment should be checked annually and when set, use a marker on the eccentric washer and base ... then you can see if it shifts ...
Now that I know (again) how it is SUPPOSED to drive, with proper alignment ... and have my settings marked ... I can check it regularly or when it seems "different"
I used to run R2's before I switched to 710's for track days. I spoke with a Nitto rep and after the standard liability garbage answer he finally told me 36-40 hot was the best depending on your car and set up. I normally have to start below 30 to end up with 38 hot. As the saying goes, your mileage may vary.
Are these, 555-R2's, a good choice for a 'dual purpose' street/track tire?
I bought a set of CCW wheels and I'm undecided on whether to buy these tires or just take the plunge and buy track tires.
Are these, 555-R2's, a good choice for a 'dual purpose' street/track tire?
I bought a set of CCW wheels and I'm undecided on whether to buy these tires or just take the plunge and buy track tires.
Thanks
David ... what size rims did you get?
If you're going to trailer, may as well get track tires - Hoosiers or Kumho's.
If you still need to drive to the track, your choices are a tire trailer to tow with the Corvette or tires you can drive on:
Depending on rim size ... most aggressive tires would be represented by Toyo RA1's (most "streetable" thread, Nitto 555RII's, Toyo 888's, Nitto NT 01's (all 100 tread rating)
Re: "spdrcrj : Cold temps, I started at 30 cold front, 26 cold rear on 555RII's. Worked great at road atlanta."
What was the ambient temp; what were your hot temps?
David ... what size rims did you get?
If you're going to trailer, may as well get track tires - Hoosiers or Kumho's.
If you still need to drive to the track, your choices are a tire trailer to tow with the Corvette or tires you can drive on:
Depending on rim size ... most aggressive tires would be represented by Toyo RA1's (most "streetable" thread, Nitto 555RII's, Toyo 888's, Nitto NT 01's (all 100 tread rating)
Re: "spdrcrj : Cold temps, I started at 30 cold front, 26 cold rear on 555RII's. Worked great at road atlanta."
What was the ambient temp; what were your hot temps?
Denny:
Sorry for the delay. I got busy trucking non-stop for a couple of days.
I bought a set of CCW Classic Ft. 18/10.5 Rr 18/11.5 these are the 'race' wheels with the small center, but they have the street ARP bolts and polished lips and have the silver shot peened centers. Mounted on the wheels are a set of Michelin Sport PS2 275-35-18 ft 315-30-18 rear. I bought these off the 'other' Corvette site for slightly less than what the wheels alone cost. They only had 2000 miles and never been tracked.
From what little bit I have driven on these tires I don't see what all the fuss is about these tires, I really don't like them. That's why I asked about the Nitto's.
Cold pressure of 32 PSI ok? This will be on a cool day, 50F if I'm lucky, possibly as cool as 40F. How do the R2's do in such temps?
In the short time I have had my Z06, I am seeing some differences between right and left pressures, both front and rear as the tires warm up.. I am going to fill the tires with Nitrogen to stabilise pressures as we are having some bad weather. My Garage is stable at 18°C but outside it has varied from 0 to 6°C.
I would recommend this, as having done track on slicks with Nitrogen the pressure differences are much less, with less natural leakage too. (The molecule is apparently bigger, but I cannot say I have seen one :-) )
Just a quick thought.
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