84 4+3

I've been taught to model and then go build it and see what happens. The model is the simulation, then you go and test. If you just go out and test whatever the hell you model without doing any simulation you end up with an even bigger pile then if you just simulate only. There is no substitute for logging 100s of 1000s of miles of seat time and doing real world testing. But at the same time I can't just go out and blow up test rockets either. I don't have the budget NASA had in the 60s... so we get the crap close then test and see if it blows up or not. (Still probably will.)

RapidC84B

I wasn't saying don't model... I was just saying I could see a younger engineer overly relying on modeling.

TBIRD57

[QUOTE=Tool Hoarder;1599036898]The latest batch of rumors is that the C8 is having frame twist issues with the "1000 horsepower variant". Where is this car? Everything we've seen testing has sounded like an updated LT probably a new LT2 as many assume. I would assume the 1000 horse variant would be a twin turbo Blackwing derived motor with electric assist front drive. Does this car exist already? Also, everything we've seen has had relatively mundane wheels/tires/brakes. I would expect this monster "Zora" model to have a widebody, large tires, and fancy brakes. Hard to do powertrain testing on the 1000 HP model if you don't use the correct sized tires to test chassis loading.

Any production engineers or powertrain engineers have any insight on how they might be testing the hi-po variant at this point? Is this real-world torture testing or theoretical computer modeling stuff?

imo just some of the gm engineers having some fun in their down time



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84 4+3

That's fair. A lot of my friends are like that. Although in reaction engineering it isn't as crucial because there is a big old safety margin worked in anyway.

JerryU

Here is the simple math! Ford GT is 3.5 Liters with 647 hp. So hop up the Blackwing in good hot rod fashion and 4.2L/3.5Lx647hp = 776 hp -1000 = 224 electric FWD hybrid. That is what they "let" Andy Pilgrim leak! If Ford can do it- GM can do better!

PS: Yep already decided I'll wait for the Grand Sport version with other than those anemic 305 section width rear tires! You're right the C8s seen in Germany with the "skinny tires" and solid front rotors is fine for the base car at a low price. The other variants will cost more. Hope I don't have to wait too long for the Blackhawk, which their building in Bowling Green- wonder why???

jcp911s

IMSA cars are pretty much limited by the rules to about 500+/- HP. So, no.

At best, I think this is "Viagra" marketing... "If your erection lasts...". (ehhh, can the lawyers find a way to say "erection" on network TV?).

Marketing VP (gloating)... "Gentle-persons, can we find a way to leak that the engineers have found problems when HP on our new C8-ish car is pushed beyond 1,000HP?.... come on, people, help me here... PLEASE!!"

elegant

Back to the OP’s question, such C8 ZR1 testing is taking place on the 140 miles of Milford Proving Grounds. And could well, be as above posted, also be occurring at Yuma test facilities.

F4 Phantom

Wait a minute! From the same article:

A Corvette prototype with a twin-turbocharged, 8-cylinder engine is generating 900 to 1,000 horsepower and is causing a "structural distortion of the aluminum spaceframe" during tests. "The twist in back was enough to fracture the glass hatch covering the engine," Hagerty reports.

Hagerty estimated that the redesigned model will start in the range of $60,000 to $70,000 and get a 6.2-liter, 8-cylinder engine with at least 500 horsepower, which would be about 50 more than the current base version.

Which is it 900-1,000hp or 500 hp? First electrical delay, now this. What gives GM?

Follow USA TODAY reporter Nathan Bomey on Twitter @NathanBomey.

keagan

I had no idea where Yuma proving ground is, then I went on Google Maps and looked it up. Dang! That’s one massive testing facility. She can scream her pipes out and they probably won’t hear it a few miles out. How da hell did Ford do such a good job of hiding the FGT?? Did they not do climate testing, real world element testing?

SouthernSon

If you can enforce the mid bulkhead well enough to prevent engine intrusion into the cockpit during front end collision why can't you also prevent frame warpage with same bulkhead structure/structures?? Doesn't take too much imagination to conjure up a few sketches.

jefnvk

Simple: IF they exist, theres only one or two, they're restricted to whatever GMs special operations department is called, and if they go anywhere its on covered trailers. Suppliers tend to not get those type of vehicles none too early, which is who I suspect most of the C8s on the public roads are being driven by.

Ford has a proving grounds down the road. Also remember, the GT was done in complete secrecy, even internally, and sprung on the public in a surprise. It wasn't a revamp of an existing car, it has almost no options that suppliers needed piles of variants to validate, and it sure as heck didn't go on the road until it was revealed.

And no, I suspect by the virtues of what the GT is, I doubt it got the attention to the HVAC that a Fiesta would.

jimmyb

I think the whole story is BS.
The C7 Stingray makes 455HP. The C7 ZR1 makes 755HP. They share the same frame.
SO, now GM can't make a frame to handle 900-1000HP?
Also, I doubt the engine in this hyper C8 will be making that much HP. Probably more like 650 to 700 with 200+ HP electric motors up front. And if that is the case, then the twisting frame/cracking backlights sounds even more suspect.
But it is a good story....

CONMAX

the C7 has been around long enough to have many examples of 1000+ hp builds. although various failures have occurred, none, to my knowledge have been related to the frame structure. probably just due to the immaturity of the C8 design as opposed to any difficult to resolve design problem. i am certain that other issues, many not reported in the press, have been encountered in the years of the ME C8 development.

NORTY

Dyno room 6, at Wixom PBC. What else you wanna know?

jimmyb

Didn't Wixom PBC close in 2014?????

The HACK

I don't think any of the 1,000+HP C7 builds have a glass dome on top of the engine, no? Those questioning why the C8 all of a sudden has an issue with shattering glass now that the engine's been moved to the back...I'm PRETTY SURE if there's a glass in place of where the hood is, some of the 1,000+HP C7 builds will PROBABLY shatter those glass too.

Warp Factor

Maybe, if they were trying to save a lot of weight.

PerKr

the problem wouldn't be the output but the torque. If they don't raise the rpm limit, which I suppose they wouldn't if they stayed with a big pushrod V8, they would have to raise the torque. Can't really see why anyone would consider raising the torque to the point where the frame starts flexing though, other than for testing purposes. That would just be incredibly poor engineering.

Bill Dearborn

The Hagerty report suggests three things happening at the same time. The electrical problem which may be affecting a number of GM vehicles, the power twisting the frame and a disagreement on interior design. That isn't unusual during new product development. There are probably a 100 other things that aren't quite as much of a hassle. Every new product goes through its problem take down curve as it gets ready for product release. The electrical issue could be physical/software or both, the power issue is probably simpler since it is mechanical and easier to resolve, the interior design issue probably ends when somebody higher up says that's enough squabbling and says do it this way.

Bill

Dethsupp0rt

That's they only way they're getting more than 800 HP or so, with a hybrid setup. Wouldn't even need tires as big as the Z06.