And Penny just keeps on changing...

[Paladin]

Steve,

attached is my scale weight, very similar to penny's. I have about 25 lbs. more on the front end, almost entirely due to the front bumper/valance, but going to the r-model fiberglass bumper, not the look I wanted.

Anyway, on the autocross in steady state cornering, I have alot of understeer. The IRS I am running keeps the car so planted it just plows that front end around. I am planning on going to a slightly smaller rear tire, which will allow me to take some negative camber out (currently -3 degrees) and will also be better for dragstrip launches, and lower it another 1/2 inch.

I can't run bigger front tires (limited to 225/45/17), any other ideas/tips/tricks?

thanks

[Steve1968LS2]

Originally Posted by Paladin

Steve,

attached is my scale weight, very similar to penny's. I have about 25 lbs. more on the front end, almost entirely due to the front bumper/valance, but going to the r-model fiberglass bumper, not the look I wanted.

Anyway, on the autocross in steady state cornering, I have alot of understeer. The IRS I am running keeps the car so planted it just plows that front end around. I am planning on going to a slightly smaller rear tire, which will allow me to take some negative camber out (currently -3 degrees) and will also be better for dragstrip launches, and lower it another 1/2 inch.

I can't run bigger front tires (limited to 225/45/17), any other ideas/tips/tricks?

thanks

Your front tires are most likely killing you.. what size are your rears?

Tomorrow we start ripping the car apart. The first thing to do is a story on swapping out the stock core support and AFCO radiator for a an aluminum one from AutoRad, along with thier HUGE crossflow radiator... We will also be transitioning to a air based Setrab type oil cooler. The AFCO in Penny now with move to the Track Rat project.

I've also started getting parts together for the new 427 sleeved LS3 engine.

We need to have her back on the road before March since I would like to run the Mojave Mile event.

[Paladin]

Steve,

I had been running the old bfg g-force kd 275/40/18's in the rear. They were not great, even for the street, and gave you zero warning at the limit.
I have heard good things about the dunlop direzza star spec so I am going to get those in a 265/35/18. The right side rubs a bit with a 275, and I want to take out some negative camber (necessary for clearance). tire wear was brutal, and lousy for drag strip launches. My car is mainly for street, otherwise I would look at teh Toyo r888. I have 480 rwhp and 441 ft lbs. to harness.
check out these H2H links:

why do the cars with better power to weight and better tires keep posting slower times???
https://www.youtube.com/watch?v=5DK-z...eature=related
https://www.youtube.com/watch?v=0ngPG...eature=related

[Steve1968LS2]

Today we started tearing down.. Also decided to try out this Autorad radiator and core support. I doubt it saves weight since the radiator is WAY bigger, but it's nice and I was curious to see what's up.

As you can see the opening is much much bigger than that stock core support. This should provide extra cooling capacity.



Gotta break some eggs to make an omlette.. This is really just a dry run since it will all come apart, engine out and fenders off so we can do some mods to the inner fenders.



Here you can see the new radiator in place. There were some fitment "challenges", but nothing insurmountable. I want to talk with the company on Monday to get thier take before going into detail. I love how the radiator fits to the new core support.



Another view... we're going metalwork the DSE closeout panel to work with this system since I like how it comes "into" the engine bay.


Oh what the hell, let's take the whole car apart.. lol.. Next to come out will be the trans, engine and all the brake plumbing.

[Steve1968LS2]

Originally Posted by Paladin

Steve,

I had been running the old bfg g-force kd 275/40/18's in the rear. They were not great, even for the street, and gave you zero warning at the limit.
I have heard good things about the dunlop direzza star spec so I am going to get those in a 265/35/18. The right side rubs a bit with a 275, and I want to take out some negative camber (necessary for clearance). tire wear was brutal, and lousy for drag strip launches. My car is mainly for street, otherwise I would look at teh Toyo r888. I have 480 rwhp and 441 ft lbs. to harness.
check out these H2H links:

why do the cars with better power to weight and better tires keep posting slower times???
https://www.youtube.com/watch?v=5DK-z...eature=related
https://www.youtube.com/watch?v=0ngPG...eature=related

Because there's more to it than just power and weight.. where the weight is and how the car grips makes more difference than just the power to weight ratio.

I really like the R888 tire.. if you drive in the rain then also look at the Toyo RA1 since it has more grooves. Neither are good for snow or sub freezing temps.

If you're having push you could try stiffening up the rear to induce more oversteer.