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Light weight C5Z

 
Old 03-24-2018, 03:13 PM
  #21  
D K
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Do you have a template, or do you jist trace the bumper outline?

Any chance youd sell just the plywood part or perhaps a template?

Last edited by D K; 03-24-2018 at 03:16 PM.
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Old 03-24-2018, 11:26 PM
  #22  
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Originally Posted by GSpeed View Post


it depends on the class. This car has very little rear weight, but we only have to manage 250ish Rwhp. We plan to test both weights and power levels. We aim to be as light as possible, and then detune power to that weight.

the hard part is that to get this car on a 275 in TT4, you have to weigh 3100. The advantage is that now we can place the weight advantageously, and have a better car with a lower Center of gravity, and less pendulum.

right now, full fuel, and driver, weíre roughly 2900lbs.
Remember you can only add 250lbs ballast MAX
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Old 03-25-2018, 03:29 PM
  #23  
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Originally Posted by GSpeed View Post
No future plans for a cage
More money than brains?
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Old 03-25-2018, 07:45 PM
  #24  
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I have a full cage
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Old 03-25-2018, 07:46 PM
  #25  
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245/35/18 might be st4 legal but itís really short...headers might drag the ground.
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Old 03-26-2018, 10:24 AM
  #26  
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Originally Posted by sperkins View Post
More money than brains?
No worse than tracking a stock car. Not ideal. But itís hard to apply that same philosophy to every car out there that doesnít have a cage.



Originally Posted by C5Z06CE View Post
Remember you can only add 250lbs ballast MAX
yes. It wonít have more than that.

Originally Posted by D K View Post


Do you have a template, or do you jist trace the bumper outline?

Any chance youd sell just the plywood part or perhaps a template?
Its st4 legal, so just 4Ē out from the bumper face. We could build and sell but shipping might be cost prohibitive
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Old 03-26-2018, 11:23 AM
  #27  
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Originally Posted by chuntington101 View Post
How much will a carbon body save you? Is there any key areas to target?
I'd be curious to hear this as well.
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Old 03-26-2018, 12:10 PM
  #28  
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Originally Posted by GSpeed View Post
Got the car on track today for the first time after some significant mods, and its working quite well.

Splitter has .300" of rake
chassis has .500" of rake

front ride height at rest on the center of the cradle is 3.75", rear is 4.200 at the frame rail by the jack puck location.


Going to do a little more work this weekend during the Drivers Edge event to see if we cant take another 10/20lbs out
where/how do you like to measure your chassis rake?
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Old 03-26-2018, 01:05 PM
  #29  
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I have to ask, What organization will let you race without a cage? Why would anyone take this risk? Is this just an HPDE car?
I wouldn't even do serious HPDE without full safety! What is your life worth?
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Old 03-26-2018, 01:20 PM
  #30  
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Originally Posted by cwikstro View Post
I have to ask, What organization will let you race without a cage? Why would anyone take this risk? Is this just an HPDE car?
I wouldn't even do serious HPDE without full safety! What is your life worth?
Originally Posted by GSpeed View Post
The car is being set up for NASA TT3 or TT4.
NASA time trials do not require cages.
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Old 03-26-2018, 04:53 PM
  #31  
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for what it's worth.....I've measure the steel b-pillar and the aluminum a-pillars in C5 and base c6, and the are structurally very close to that of 1.75" roll bar tubing. You don't have the front halo tying it all together of course, and no diagonals, but c5/c6 has excellent roll-over protection and I'd not hesitate to TT in one.

NASA TT is open passing, crazy **** happening all over the place, it's not like other TT and Autocross style events.

Carbon roof was worth around 50lbs, carbon fenders around 10lbs, but WC c5/c6 cars ran carbon everything including the inner tubs. I'd personally like to get a carbon hood and front fascia (it is very heavy) and I'd be happy with both the weight and the bias of my car
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Old 03-26-2018, 08:36 PM
  #32  
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Originally Posted by GSpeed View Post
No worse than tracking a stock car. Not ideal.
Agree, but it's a whole new level of crazy when you strip it down to a super light weight and add aero.
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Old 04-01-2018, 10:34 AM
  #33  
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This was hard to do, added 15lbs, but dropped 1.5 seconds.

Car has a front aero push, plan to add some dive planes and splitter fences. Adding all of this drag is counter intuitive, but our top speed has increased feom
when it had no aero. 116mph-120.

For those familiar with Motorsports Ranch, the car laid down a 1:17.3, in traffic on a full tank. Thatís knocking on the TT3 track record. I suspect we will run a low 16, even high 15.

Peak lat G was 1.6, peak long G under braking was 1.25! This is all on a stock 2pc batwing pan with improved Racing baffles, and overfill 1.5 qt. We will measure oil pressure next time out.

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Old 04-01-2018, 10:51 AM
  #34  
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Originally Posted by STANG KILLA SS View Post
where/how do you like to measure your chassis rake?
we measure the front cradle, and the rear of the chassis by the jack points.
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Old 04-01-2018, 11:46 AM
  #35  
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Thanks for posting up. What tires?
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Old 04-02-2018, 10:25 AM
  #36  
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That is awesome! Nice work!!
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Old 04-04-2018, 08:44 PM
  #37  
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We tuned it up on the dyno today, for the unrestricted tune. This is a 70k mile Ls6, only mod being a dirty black wing and a set of long tubes.


Its about 10/15 low, in our opinion, but it could be any number of things. This engine could use a refresh, which we will do later, hopefully before it breaks!


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Old 04-04-2018, 09:03 PM
  #38  
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That's a serious amount of power in a 2,600lb track car.
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Old 04-04-2018, 10:29 PM
  #39  
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My Ls6 was 70k street miles from a cts-v and then did 5 race seasons. It was about 360 on dyno before the ASA cam, now it is 380 hp and probably 85k miles. It'll last . I run a batwing pan and an accusump.
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Old 04-05-2018, 02:28 AM
  #40  
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That is within about one or two horsepower of our OEM engine Spec Corvettes running the OEM exhaust manifolds, but various exhaust systems after that.....

I would say the car is right in the normal range.


Originally Posted by GSpeed View Post
We tuned it up on the dyno today, for the unrestricted tune. This is a 70k mile Ls6, only mod being a dirty black wing and a set of long tubes.


Its about 10/15 low, in our opinion, but it could be any number of things. This engine could use a refresh, which we will do later, hopefully before it breaks!


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