Question on mods

[Bob Hubbard]

How important is it to groove on your tires ?

[RCJ]

I divide the car in to 3 categories,Motor ,Chassis ,Tires.You will spend equally amounts of time on each one.Tire prep is a little bit of a black art.The combination of grinding ,siping and grooving is going to change with compounds and track conditions.When I say prep I'm not talking about soaking.

[Bob Hubbard]

Is this a good video about tires .....https://www.youtube.com/watch?v=zUEfC1jTKiY

[Bob Hubbard]

Question

ok ...so the question is .... My buddy has a 2013 diamond clamp car .... He ran into a local racer who said he can easily change it from clamp to spring behind .... He said 300 -400 to change it over to a spring behind ... I believe he called it adding a bird cage ? Does this sound right ...

[RCJ]

That video is one way to do it.With those tires I would just cut the factory cross grooves a little deeper, then add swallow sipes.I always want to keep the newest tires on the car so I cut them to help some in the tack without hurting in the slick.I would run the car as is and establish a good base line first, before I changed alot of mounts

[Bob Hubbard]

question

Why would you want a clamped base line if your going to change it to a completely different suspension?

I dont understand your comment ? I thought it was one or the other ...

[Bob Hubbard]

My buddy cant make up his mind on what scales to buy ? Old school beam scales or digital .... Seems like the old beam scales would be the simple way to go ....Any thoughts on the scales ?

[powerslide]

My buddy cant make up his mind on what scales to buy ? Old school beam scales or digital .... Seems like the old beam scales would be the simple way to go ....Any thoughts on the scales ?

If you are talking about the old grain scales they are fine. If you have a lot of extra space, back in 03 a regional late model champ was still using them. Digitals are great for a guy who's racing out of a small shop or garage because they don't take up much space. Either will work fine as long as they are taken care of. Don't pull the cords out by the wire on electrics and don't push/pull on the upper portion of the grain scales.

[Bob Hubbard]

Question

If you are talking about the old grain scales they are fine. If you have a lot of extra space, back in 03 a regional late model champ was still using them. Digitals are great for a guy who's racing out of a small shop or garage because they don't take up much space. Either will work fine as long as they are taken care of. Don't pull the cords out by the wire on electrics and don't push/pull on the upper portion of the grain scales.

..... Yea I was talking about the grain scales .... I was thinking the older scales would read the same every time .... I guess im just old school ....LOL

[Bob Hubbard]

What tire pressure numbers should we be using .... We have a book but my buddy seems to think lower is better .... He was asking one of the local fast guys and he was told way lower than he was running ...

[RCJ]

r/r 14 to 12 r/f 14 l/r 9 l/f 8 .I know guys than have ran lower but it was on real slick flat track.

[JustAddDirt]

lf10
lr10
rf14
rr13
that is were I typically start for Florence, Lawrenceburg, and Moler which sounds like the area you will be racing.
The problem with the LR being ran low on pressure is that they build heat faster and expand, rendering your stagger numbers useless. also with the left front at 8, I think that is too low, makes it hard to push a car with flat tires, and you get a lot of sidewall deflection, which will make steering feel lazy, or spongy. It also will soften wheel rate of that corner.

[Bob Hubbard]

Do these pressures vary with track surface Temps ?

[JustAddDirt]

not for me no.
might adjust for track conditions slightly

[Bob Hubbard]

Thanks that worked .... Now that the old car is handling better ....The New car is ready .... LOL