Right, and you meant to say "gription".

Dave

 

To throw in my $.03 worth (yes, I am worth more). I would agree with what just about everyone is saying. Although I truly agree with JoshC about setting your pressures at what is reasonable (35-40 hot) and just driving and feel how the car reacts. Driver ability is a lot more important at beginner stages than a nuts on setup car. Heck even something all screwed up gives you a feeling and experience that you need as you continue to drive on a track and learn from. A good driver in a poorly setup car will typically outperform a bad driver in a ideal setup. Don't forget to hit the kart track for more seat time and lots of fun. That is what made me a significantly better driver.

j9fd3s, the K2RD website is giving a 404 error.

 

Run nitrogen and forget about it

 

Please elaborate?

 

I was joking a bit. Nitrogen is a real pain in the ***. I do it on my formula car so that on the start of the race I am not on 8psi and waiting for the tires to heat up, just about all the SCCA national guys are doing it.

Really, the nitrogen doesn't contain any moisture and does not "heat up" when tire temps increase. The pain in the butt part, is you have to get as much of the air out of the tire before you fill it with nitrogen. I use a vacume on it for a few minutes. Then fill it up with nitrogen and set my pressure....set it, and forget it (thanks Ron Popile) If I want to run 13 in the front, and 15psi in the rear, i set that in the pits and when I come off track it might be .5psi higher at most.

But, you have to get a nitrogen tank and regulator and tote that around to the track. Air is free too. Nitrogen is pretty cheap, like $40 a large cylinder.

 

why are your psi numbers so low? 8psi for air? 13 and 15 for nitrogen?

 

Different car, different tire. Sorry I didn't make that real clear, just using what I know for an example.

Use the same pressures you would for air, if you want 28psi in a Hoosier, fill it to 28 and go to town.

8psi for air would then heat up to about 13 or 15 psi at race temp. This is on a formula car that corners at 1.75g+ so they generate a good deal of heat. And being a small tire, it doesn't take much to raise pressures. So, to be where I want to at race temp (with air) I would have to start the race much much lower to allow for the tire to "grow." So, on nitrogen, since it does not expand when it heats up, I set it where I want to be, 13f and 15r.

Maybe I missed it, but what kind of tire are you planning on using? I have no experience racing on a street tire so I can not say how much nitorgen would be of benifit.