Run To The Coast 2 -- super cool video -- not with GPS track data! - Page 3 - Lateral-g Forums

Vegas69 · #21 02-28-2011, 09:20 PM

He was hauling the mail and the car looked great.

You know the old saying, if you want to find out how fast your car really is...

Looks like I was hitting 110.xx according to my calculations. I was on the rev limiter(6800) in 3rd after the first set of cones. Should of put that 7k pill in the car.

onevoice · #22 03-01-2011, 08:38 AM

Quote:

Originally Posted by Steve1968LS2

Then he got into a wierd driver speak deal.. something about how when the car started to push he would just mash the gas and the back would plant down and then he would turn the wheel (to the direction he needed to go).. let off the gas a bit and the car would pivot in that direction. I'm not a good enough driver to really get what he was explaining.

Transferring load to the rear tires can bring the fronts back up the traction curve, and enable them to have more lateral grip. A tire has increasing lateral grip with increasing vertical load, but not at a linear rate. It doesn't always work, especially with cars that dont have enough power to shift much load.

Seat time and experience rules.

**Steve1968LS2** · #23 03-01-2011, 08:43 AM

Quote:

Originally Posted by barraza

Transferring load to the rear tires can bring the fronts back up the traction curve, and enable them to have more lateral grip. A tire has increasing lateral grip with increasing vertical load, but not at a linear rate. It doesn't always work, especially with cars that dont have enough power to shift much load.

Seat time and experience rules.

Well, I seem to have enough power.. lol

Dave Pozzi said it was a quite a ride.. needed that helicopter chase cam to get the full effect. Nathan drove Rolex series cars, so he really knows how to bring it.

Next mod is to give my fronts more room to compress into. I also want to take out some roll, but I'm afraid of screwing up how the car is working. Right now the rear bar is disconnected and I have 500 front and 275 rear springs.

Jr · #24 03-01-2011, 09:07 AM

Quote:

Originally Posted by Steve1968LS2

Well, I seem to have enough power.. lol

Dave Pozzi said it was a quite a ride.. needed that helicopter chase cam to get the full effect. Nathan drove Rolex series cars, so he really knows how to bring it.

Next mod is to give my fronts more room to compress into. I also want to take out some roll, but I'm afraid of screwing up how the car is working. Right now the rear bar is disconnected and I have 500 front and 275 rear springs.

What size tire are you running on the front? 275, 285, 295, 315?

onevoice · #25 03-01-2011, 12:33 PM

Quote:

Originally Posted by Steve1968LS2

Next mod is to give my fronts more room to compress into. I also want to take out some roll, but I'm afraid of screwing up how the car is working. Right now the rear bar is disconnected and I have 500 front and 275 rear springs.

Body roll in and of itself isn't necessarily a bad thing, it is the loss of control of wheel motion and transient behavior that is the problem. I have always thought BP looked undersprung in pictures, but you are bumping into the physics of the situation with regard to CG heights and wheel/ground clearance. Your spring rates are not excessively high now, it certainly wouldn't hurt to try upping them and seeing how it does.

**Steve1968LS2** · #26 03-01-2011, 07:19 PM

Quote:

Originally Posted by barraza

Body roll in and of itself isn't necessarily a bad thing, it is the loss of control of wheel motion and transient behavior that is the problem. I have always thought BP looked undersprung in pictures, but you are bumping into the physics of the situation with regard to CG heights and wheel/ground clearance. Your spring rates are not excessively high now, it certainly wouldn't hurt to try upping them and seeing how it does.

No, body roll is fine.. well, obviously since the car sticks.. but I do find it a bit disconcerting (just need to get use to it)

The only problem I'm having is that the suspension is so compliant that the car rolls enough to cause the front tires to contact the inner wheelhouse and the frame/header get awfuly close to the ground. A little less roll wouldn't be bad along with a redesign of the front wheel wells..

I have 550 springs for the front.. and 310s for the rear, would that make any difference or do I need to make a bigger change?

**Steve1968LS2** · #27 03-01-2011, 07:21 PM

Quote:

Originally Posted by DJW32

What size tire are you running on the front? 275, 285, 295, 315?

A 275/35/18 .. the tires on sat were the PS2 viper spec tires and the replacements were worn harder version PS2 tires.. You could really tell the difference in "stick" since we had a lot less bite.

I think I will up my neg camber closer to 2 .. it's at 1.5 right now.

ccracin · #28 03-01-2011, 07:45 PM

Quote:

Originally Posted by Steve1968LS2

No, body roll is fine.. well, obviously since the car sticks.. but I do find it a bit disconcerting (just need to get use to it)

The only problem I'm having is that the suspension is so compliant that the car rolls enough to cause the front tires to contact the inner wheelhouse and the frame/header get awfuly close to the ground. A little less roll wouldn't be bad along with a redesign of the front wheel wells..

I have 550 springs for the front.. and 310s for the rear, would that make any difference or do I need to make a bigger change?

Steve,

The springs you have don't sound bad. You don't want to loose all the compliance as you will loose traction quicker when the road or track surface isn't optimum. Not to mention if you drop a wheel off in the corner or hit the curbing it can really upset the car. If I read right, you said the rear bar is disconnected. I'm not sure what bar you have on the front, but I would try a bigger bar on the front and connect your rear bar. This should help keep the balance and gain roll stiffness in the corner, but keep some of your compliance. Obviously, I don't know your exact specs or if you have these options, just a suggestion. Penny is looking really good!

**Steve1968LS2** · #29 03-02-2011, 09:02 AM

Just for the record.. I deleted a bunch of crap that didn't pertain to the thread..

This was about the exhibition video..not about event politics or results.

Having said that..

Congrats to Ryan at DSE for having the fast lap of the event
Congrats to Speedtech for winning the comp class of the road course
Contrats to TCI for winning the comp class of the speed/stop challenge

See, it's all puppies and rainbows now

**Steve1968LS2** · #30 03-02-2011, 09:03 AM

Quote:

Originally Posted by ccracin

Steve,

The springs you have don't sound bad. You don't want to loose all the compliance as you will loose traction quicker when the road or track surface isn't optimum. Not to mention if you drop a wheel off in the corner or hit the curbing it can really upset the car. If I read right, you said the rear bar is disconnected. I'm not sure what bar you have on the front, but I would try a bigger bar on the front and connect your rear bar. This should help keep the balance and gain roll stiffness in the corner, but keep some of your compliance. Obviously, I don't know your exact specs or if you have these options, just a suggestion. Penny is looking really good!

Im worried that lessing the roll will lessen compliance and grip.. this stuff is COMPLICATED!!!