Operation Bad Penny version 2.1T (track edition)

[zbugger]

...And best of all.. new Forgelines showed today

17x10 wheel.. weight 21.15 lbs


Looks like we nailed the backspacing.. plenty of room.. lol

Oh man... Those look so... So... Damn... I can't wait to see pics of it on the ground.

[454bug]

Hey Steve,

Are you running the Wilwood 14" rotors??

How close are the tie rod ends to the wheels at full lock?

[David Pozzi]

Steve,
Can you list your latest corner weights for Penny?
Also can you measure the rear shock positions for me? I need left to right distance shock bottom to shock bottom, also top to top across the car.

1 I need the height of the bell-crank from ground with car on it's wheels, and what is the hole spacing for the pivot?

2. is your front bar stock corvette type? what diameter? arm length? if it's non stock, do you know the rate?

[Steve1968LS2]

Steve,
Can you list your latest corner weights for Penny?
Also can you measure the rear shock positions for me? I need left to right distance shock bottom to shock bottom, also top to top across the car.

1 I need the height of the bell-crank from ground with car on it's wheels, and what is the hole spacing for the pivot?

2. is your front bar stock corvette type? what diameter? arm length? if it's non stock, do you know the rate?

Earlier in the thread there's a pic of the car scaled BEFORE we made the wheel/hood/engine changes... and none of the shocks were set for pre-load.

I will get those measurements for you tomorrow.

I do know that we have three positions we can use for the Watt's bell crank. Currently we are in the middle of the three and the bell is about 8.5 inches off the ground. I think it moves two inches per a position. I will double check tomorrow.

I think the front bar is one inch solid.. I will confirm. Upper and lower control arms are stock Corvette (C5)

[Steve1968LS2]

Hey Steve,

Are you running the Wilwood 14" rotors??

How close are the tie rod ends to the wheels at full lock?

13-inch

I have no clearance issues.

[Steve1968LS2]

Busy day today...

Hood is color sanded and buffed. Unfortunatly our lift broke so we couldn't work under the car, but I did get the engine mostly assembled. Once the trans crossmember is in place I can bolt down the intake and plug it all in. Will put in the radiator tomorrow. Everything fits just perfect.

Here's a rough preview of how the car will look. Need to be lower in the front but you get the idea. The hood is just sitting on there, so it's not aligned or anything.

The new wheels/tires look KILLER... I love em..

275/40/17 and 315/35/17 R888



Like I said, engine is mostly together. New Powermaster alternator is black thermal coated (old one blew the bearing). Chris re-routed the brake lines to move them away from heat. New Canton remote oil filter is mounted near the sway bar. Added a new drivers side valve cover with another breather. Other than that it's pretty much the same.

[FirstGenZq8]

17x10 wheel.. weight 21.15 lbs

excellent. thank you for weighing them. did you weigh your rear wheels as well? what model are your ZX3 wheels (Premier Series, Street Series or Competition Series)? reason i ask is here: https://www.pro-touring.com/forum/sh...ad.php?t=48248

[David Pozzi]

Steve,
I found your corner weights.
Looking at your spring frequencies it shows you have enough spring rate at 600 front and 250 or 300 rear, what you are lacking is roll stiffness which is provided by the anti roll bars. Stiffer springs don't affect roll rate very much, not like an anti-roll bar does.

I need more info on the front bar and rear pivot height to get a better picture of what your total roll stiffness is.

For the bar measurements I need bar OD and ID if hollow. I need the width of the middle part bend to bend, I have the width eye to eye /--------\

[Damn True]

The car looks way better IMO with more sidewall on the tires.

[rlplive]

Man that looks incredible, as if your car wasn't already so badass.

[Steve1968LS2]

Steve,
I found your corner weights.
Looking at your spring frequencies it shows you have enough spring rate at 600 front and 250 or 300 rear, what you are lacking is roll stiffness which is provided by the anti roll bars. Stiffer springs don't affect roll rate very much, not like an anti-roll bar does.

I need more info on the front bar and rear pivot height to get a better picture of what your total roll stiffness is.

For the bar measurements I need bar OD and ID if hollow. I need the width of the middle part bend to bend, I have the width eye to eye /--------\

It's a splined bar.. so no bends. Do you just want total length? Pretty sure it's a solid bad.. actually I'm positive.

Is 550 front ok or 600 better? Sticking with 300 in the rear. Mike Meyers (SCCA) wanted even more.

[Steve1968LS2]

excellent. thank you for weighing them. did you weigh your rear wheels as well? what model are your ZX3 wheels (Premier Series, Street Series or Competition Series)? reason i ask is here: https://www.pro-touring.com/forum/sh...ad.php?t=48248

For some funny reason the rears weighed less.. 20.85 lbs

Competition series.. Titanium bolts, jet nuts...

[David Pozzi]

It's a splined bar.. so no bends. Do you just want total length? Pretty sure it's a solid bad.. actually I'm positive.

Is 550 front ok or 600 better? Sticking with 300 in the rear. Mike Meyers (SCCA) wanted even more.

In that case, I need the diameter, width arm to arm, then the arm lengths center of bar, to center of end link hole. If the arms connect to stock locations on the lower A arms, I have that.

I'd go with the 300's on the rear since you don't have a rear bar, and the 600 fronts. The fronts look very stiff, but right now, you need them for what roll stiffness they do provide. When you get the right bars on it, the front coils can probably be softened.
David

[67SSDan]

Looks awesome man. Keep the posts coming. I can't wait to see pictures of it at a slight distance.

Dan

[55chevyman]

boy do i like that new rubba!!!

[David Pozzi]

Non-adjustable.. for a couple of reasons.

1. The shock is so short that they didn't want the rebound adj on the shaft (since it would shorten the travel even more). Heim to heim is 12.5 rear and 13" front.

2. Bilstein didn't want to do the remote deal yet and want to try and valve them the right way.

Steve at Race Car Dynamics worked with several people including SCCA autocross racer Mike Meyer (sp?). They determined that for what I want to do that 300 would be good in the back. In fact mike wanted to go more. lol.

If I add a rear bar down the line I could back down to a 250. We went to 550 in the front because they didn't have a 10" 600 lb spring in front. Should be fine though.

Will see when it hits the road. Fascinating stuff on the roll center aspect. I'm at 8.5 right now and I'm not at the lowest setting. No wonder the car is so compliant.

Can't wait to dyno the 402 tomorrow... Old numbers were 568 hp and 501 tq... wonder what the new ones will be?

Steve, I found your corner weights and saw this earlier post, so the rear RCH is 8.5"? How many more holes can you raise it? and what are the hole spacings.

Once I have the front bar info I can see what the difference might be between the 550's and 600's. If I understand correctly, the 600's are taller and won't really fit???
David

[FirstGenZq8]

For some funny reason the rears weighed less.. 20.85 lbs

Competition series.. Titanium bolts, jet nuts...

huh, that's weird. are the rears 17X10's or ??X??'s?

[compos mentis]

huh, that's weird. are the rears 17X10's or ??X??'s?

Here

https://www.pro-touring.com/forum/sh...6&postcount=35

[Steve1968LS2]

Steve, I found your corner weights and saw this earlier post, so the rear RCH is 8.5"? How many more holes can you raise it? and what are the hole spacings.

Once I have the front bar info I can see what the difference might be between the 550's and 600's. If I understand correctly, the 600's are taller and won't really fit???
David

I can raise the knuckle one more or I can lower it one more from where it is.

RCD didn't make a 9-inch 600# spring so they went with 550s. I had my Alston 600s powdered black (9" 600#) so we do have that option.

Working on the measurements.

[Steve1968LS2]

huh, that's weird. are the rears 17X10's or ??X??'s?

17x12.. but the fronts have a thicker hub so more weight by a tiny bit.

pretty damn light for a 12" wide wheel..