travisnd

And under $1000 i.e. not Penskes

Brent Dalton

travisnd

I can't find any... the LG and Pfadt shocks are inverted.

PushinTheLimit

Any reason why you don't want inverted?

Kubs

NASA charges +1 point for inverting the shocks.

PushinTheLimit

Gotcha.

travisnd

0Anthony @ LGMotorsports

Bilstein does but they are close to $10k for the set.

RX-Ben

No - you can prob find used LGs or DRMs for that price though.

Non-adj Penske 7500s are $375 each + mounting stuff. Gary can mount them any way that you want.
I was going to use this setup before the 255 rule.

RacePro Engineering

Travis,

Koni "yellows" are a very nice adjustable. They are not as sophisticated as Penskes, but then . . . . .

Not certain on current pricing, but probably right around your limit.

Ed

gmccreary

Mark had a nice set of shocks in his shop this weekend. Did you make him an offer?

travisnd

They were inverted +4 points

RacePro Engineering

As you gentlemen know by now, I do not have a lot of patience for this give-a-point-take-away-a-couple-points nonsense, but in this case I can not refrain from asking: What in the world is the reasoning behind this particular penalty?

Insight anyone?
Ed

RX-Ben

Unsprung weight.

Anyone know when this rule came about? Was it intentionally directed at C5s?

acrace

The older Koni 3013s weren't inverted. Perhaps they can still be found in someone's slow moving stock or through ebay or the like.

BTW, I was able to buy a set of used Penske 7500s well under $1k. The secondary market can be your friend, but like everything, buyer beware.

SteveC68

I had been trying to find a set of non adjustable inverted shocks as well and pretty much gave up. As acrace said above the older Koni Red was adjustable and non inverted, but was discontinued a couple years ago. There is an ongoing auction on ebay for 3 brand new Koni Reds (missing 1 rear shock).

http://www.ebay.com/itm/Koni-special...item43a9fd6f0f

http://www.ebay.com/itm/Koni-special...item3a6adf8a4d

Now one thing to consider about the Koni Reds. They are longer than the Koni Sport Yellow by approximately an inch. So if you lower your car much you are going to be hitting the bump stops.

I decided that I'm going to get a set of Bilstein sports and have Bilstein revalve them for a total cost of around $650 including the revalve. Just buy the shocks (eshocks.com) and send them to Bilstein. Tell Bilstein all the info about your car and what your intended application is (autocross, HPDE, etc.) and that you want digressive valving. You will end up with one of the best non adjustable shocks under $1k.

travisnd

That's how PTA/TTA is... you get 19 points to spend how you please. Your first 7 are pre-spent for having a C5Z06 so really you have 12 to spend how you want.

The next calss up is ST2/TTS which is the same power/weight rules, but unlimited modding. But to fully prep a ST2/TTS car you need to spend a lot more money.

I'm currently considering my options in light of the new 255 tire points change:

1. Take off my spoiler and T1 bars and run 275s and stay PTA/TTA

2. Run 245s, leave my car as it currently is, spend 3 more points that I get for running even smaller tires.

3. Just say screw it and run TTS/ST2 with a half-developed car.

acrace

They did have Koni Sports in the yellow tube in the non-inverted design. I have a set and considering having them de-gassed and retrying them.

Bought them back in '06 from ATI and Tire Rack. Single adjustable - rebound. What was interesting was that, for the rears, at low velocities, there was virtually no difference in rebound force under (approx) 2 in/sec. I checked four shocks, from two different vendors, and they were all that way (and the curves were virtually identical).

I wound up using them for a few autocrosses in the summer of '06 and then decided to take them off. Lots of internal gas pressure which raised the ride height of my C5 Z06 by approx 10 mm. Hence the thought of de-gassing them.

The Bilstein guys are good at custom building shocks, although it has been a long time since I've gone this route, but this may be the most practical.

drivinhard

obviously nasa sprint races are a different animal than getting a car fast for 2 laps, but I can tell you from the races I ran the penske's, especially the heat of the summer, they are a fantastic race shock. when I did their 2 day shock class one of the "ah ha" moments for me was seeing how hot a shock will get on a shock dyno just from friction, even at lower velocities. add in some high speed stuff, brake rotor heat, tire heat, heat from the exhaust not far away, and see you can see what a horrible environment these things have to work in. IOW, when you are 10 laps into a june race at RA and complaining about the tires going away, it's probably as much the OEM shocks changing their damping curves (going away) due to the heat as much as the tires.

i was amazed at how consistent the car stays on the penske's through a race. their lighter viscosity fluid (there's a coupla three options) will stay more consistent but will need to be changed more often. if you have the points to spend on them, they are a great racing shock. inverting them saves about 2.5 lb of unsprung per corner.

SteveC68

acrace,

Have you read this website?

http://farnorthracing.com/autocross_secrets6.html

There are several pages on shocks and one of the things discussed was degassing.