1969 Torino

[Ron Sutton]

Originally Posted by Sieg

X's 2

Ron you've done an exceptional job of explaining a complex component system in comprehendible layman's terminology. It takes a fair amount of time just to compose your posts in that manner and it is truly appreciated.

Thanks for the kind words.

.

[carbuff]

Ron, another general question.

When taking the measurements to perform all of these calculations, what amount of "error" can you tolerate? There are so many variables here, and the easy answer would be none. But in the real world, that's just not possible. Even down to the clearances for bolts through holes, 'slop' in the various components or the suspension components, play in the steering rack, etc will add up to easing hundreths of an inch in some cases...

So I'm curious, with all of this great information and technical analysis, at the end of the day, how do you deal with those variables, and how much tolerance do you build in to your systems?

[Ron Sutton]

Originally Posted by carbuff

Ron, another general question.

When taking the measurements to perform all of these calculations, what amount of "error" can you tolerate? There are so many variables here, and the easy answer would be none. But in the real world, that's just not possible. Even down to the clearances for bolts through holes, 'slop' in the various components or the suspension components, play in the steering rack, etc will add up to easing hundreths of an inch in some cases...

So I'm curious, with all of this great information and technical analysis, at the end of the day, how do you deal with those variables, and how much tolerance do you build in to your systems?

I can't say we approach the measuring project with any tolerance in mind. When we're doing the process on an existing car, literally on the floor, we use tape measures, plumb bobs, levels, digital inclimeters & even lasers. We measure to the 1/32" where we can.

On our chassis jig, which has a surface within .003" ... and it's easy to get right at things, we use these really long 18" digital calipers, so we're measuring in the thousandths.

It's funny, you can be off on some measurements 1/4" ... and the roll center doesn't change. And on other measurements 1/16" makes a noticeable difference.

I always advise guys to be as accurate as you can, which requires patience more than anything. If you can get your measurements within a 1/16", you're doing good.

Also, When we're measuring a car we're running ... we want the real numbers ... warts & all ... because we have to deal with whatever is "out" or "off" about the geometry.

.

.

[Track Junky]

So Rob, I'm wondering after all of this potent suspension intel are you still going to be runing 285's up front?

[FETorino]

Originally Posted by Track Junky

So Rob, I'm wondering after all of this potent suspension intel are you still going to be runing 285's up front?

Yep

The largest wheel I can fit up front is an 18x10.5". The best fit in tires for that is a diminutive 285 35 18.

I will suffer the consequences of the miniscule amount of grip that tiny tire will provide up front.

I am making a couple of small changes at the rear of my car based on all the intel.

And none of them include leaf springs.

[Sieg]

I found your solution!

[Wissing72]

Originally Posted by Sieg

I found your solution!

WTF!!!??

[Track Junky]

Originally Posted by FETorino

Yep

The largest wheel I can fit up front is an 18x10.5". The best fit in tires for that is a diminutive 285 35 18.

I will suffer the consequences of the miniscule amount of grip that tiny tire will provide up front.

I am making a couple of small changes at the rear of my car based on all the intel.

And none of them include leaf springs.

LOL.......Touche.

Just to be fair I'll start to post up a couple of changes I'll hopefully get done before my August 11th track day later in the week. I'm sure you'll find something to jab me about(other than leaf springs....that cards been played)

[FETorino]

Originally Posted by Track Junky

LOL.......Touche.

Just to be fair I'll start to post up a couple of changes I'll hopefully get done before my August 11th track day later in the week. I'm sure you'll find something to jab me about(other than leaf springs....that cards been played)

Well for the near future your lap times are guaranteed to be way faster than mine no matter what you do.

It may be possible to beat you with a 195 45 15

[Track Junky]

Originally Posted by FETorino

Well for the near future your lap times are guaranteed to be way faster than mine no matter what you do.

It may be possible to beat you with a 195 45 15

I hate to admit this but awhile back I was doing some testing on Salmon Falls road and caught someone driving one of these up Salmon Falls road. I got up on his tail and started pushing him up the hill. It was fun trying to watch him shake me off his tail as he was breaking it loose around the corners.

Quite honestly, properly tuned those things are fast and there are alot of guys that track them but it's annoying to be on the track with guys that own those things and are inexperienced.

In my earlier years while training in HPDE one of the instructors took me out in his race car....and we had one get loose in front of us. It spun about a 140 and as we tried to race around him his car backed into the back side of us. Nothing serious but did take some paint off the back of the Camaro.