n8dogg

I know this seems odd, but believe it or not I have a customer that has dropped his car off and does not want it back until it is capable of 200mph. He previously owned a 99 coupe, says it topped out 6mph faster than his C6, and that he wants to up-grade, not down-grade in top speed.

The obvious comes to my mind, first being aerodynamics. Are these cars aerodynamically capable of 200mph with power mods? Second is power. What are some mods we can do to this car to be in the power range needed for such speeds.

If anyone has had some experience in achieving such a goal, your help is appreciated.

AORoads

A customer? Well, in that case, I suggest you look at the Texas Mile thread posted up by LGM, a forum vendor, who went 210 or thereabouts this past week. It is aero, but I'd say a whole lot more.

OnTheDouble

I think you would need a shorter 6th gear to help pull up top, esp. if it's not a z-51. That and 500+ rwhp. And some good downforce in the rear.

mikejfl

I sold my vette a while ago, but am still addicted to the forum with the hopes of getting a vette one day (after economy gets better, after second baby in 12 months is born etc...) LOL...

Anyways my mods are in my sig and my story is that one night on the way home from work I had a loooongggg straight shot of open smooth road ahead of me so I slammed the pedal. I intended to do 150 but I got there so fast that I figured I would surely be finished once I hit 160. My friend, before I could even realize that I hit 160 to take my foot off the gas I had already blown by 160 and hit 170 like it was a walk in the park.

Only intending to do 150, I could not believe how fast I blew past that on my way to to 160! And to further that, I absolutely could not believe how fast I hit 170...like I said it was so fast that even though I wanted to stop at 160 I hit 170 before I could even realize I had already blown past 160. 170 was freakin fast...

Looking back on it now I wish I would have gone for it all...I bet I could have hit 190 but I am not a professional driver in any way and the thoughts of going to jail and the reality of truly how dangerous my act was stopped all that at 170.

Wish someone could have been with me to appreciate it. So thats my story with the supporting mods that were on my car. To hit 200 I would assume you need a slightly larger top end cam, fast intake, aerodynamics work, a helmet, more fuel in the tuning for that speed, proper air in your tires with proof of no nails from daily driving, cast iron ***** to do it, and an open road with no traffic. You have no options at 170, you would really have no options at 200.

Man I need a Vette!

TEXASRANGER

No Need to ask anymore.........
http://forums.corvetteforum.com/show....php?t=2168056

Gearhead Jim

Someone posted that although the C6 manual tranny usually tops out about 186 due to aerodynamic drag, there is also a 186 mph speed limiter in the ECM. Not sure if that's true for last couple of years, because someone claims the tires are now rated "over 186 mph" instaed of simply "186 mph." Obviously, you would need to remove the limiter if it exists.

The general rule is that aerodynamic drag increases as the square of the speed. Not sure if rolling friction is the same, but if so:
A 10% increase in power will give you 3.3% more speed.
A 25% increase in power will give you 5% more speed.
And who knows what the aerodynamics & handling would be.

I'd say, get the guy some chill pills, save him a bunch of money and maybe his life.

CMY SIX

the Z06 hits 200 in fifth gear,{same tranny as base model} six won't do you any good, computer cuts off at 186, have to alter the limit, given enough room it will hit 200, Now I hate to say it but... if your charging people to work on their cars and you have to ask for help on CF, maybe YOU should be giving your "customer's" a disclaimer before you start any work. I take it that this customer doesn't know about CF?

walterm32

The LG car hit 200mph+ in 1 mile. Its probably capable of 230mph+. Put a twinturbo set up on the coupe and theres your 200mph. Doing it within 1 mile is a completely different story.

n8dogg

CF is a source for a wealth of knowledge. I am very involved with my work and the Corvette community, it is surprising that more technicians dont use this site as a tool. My customer is very aware of our abilities and that we will not be liable for what ever may occur due to any modifications or his driving habits. I am never ashamed to ask anyone for help in any problem I come accross in diagnosing a car. I am the only technician at my work, I have no body to discuss concerns with. Makes sense that I would come to CF, does it not?

99c54me

Yep. I bounce ideas around work all the time. And I'm one of the senior technical leads. My new hires have some great and creative ideas. Can't know everything all the time. Often we need those additional thinkers to brainstorm the best solution.

EuroRod

Drop it out of an airplane. Should hit 200 mph right before it hits terrafirma.

C6 DVL

you are 100% right on the money!!!!!
525rwhp (w/3.90s) I was at 187mph in 6th @ 5,200rpms car was still pulling but the rear was getting not sure if my ECM still has a limiter

BrooklynC6

The ECM does indeed cut the power out in some way- In my Supercharged 07 , I was at about 194-195 when the car went into "Reduced Power Mode" or some message like that and cut the power way down .... I backed it down to about 170 , drove for a few minutes , pulled over , car was fine . I guess the ECU just wasnt happy .

Never made the big 200 though

Dgatto

Same here..... 545 RWHP and 4:10's 185 MPH at about 5200 RMS's in 6th and still pulling hard

06.Z51.MontRed.Vert

You guys are

PowerLabs

My 2003 C5 Z06 hit 179MPH pretty fast and then just started bouncing the rev limiter in 5th; this was on a slight downhill though.
The C6 takes much longer to get there because 5th is much longer, but it is factory tested, developed, and waranteed to do 186MPH. For an entire tank of fuel! With only 36more HP the LS3 C6s will break 190MPH from the factory.

The C6 Z06 will do a factory claimed 196MPH with 460RWHP. STOCK. With a smaller frontal area and lower CD the C6 should hit 200 at that power level. More power will get you there quicker of course... Even at 500RWHP you may have to stand on the gas for a few miles (around 2-3?), which is OK because you are going over 3 miles a minute anyways . Any 500RWHP C6 should be able to hit 200+MPH provided it makes that power at the wheels near 6000RPM, which is where 200MPH will happen; now, whether the engine can withstand the heat load that produces without detonating is a different story. I have lost not one but two engines from attempting top speed runs . These were turbo cars though.
Aerodynamically, the car is built for it. What is important is to bear in mind that the factory ride height and the rake the car has (the rear end is considerably higher off the ground than the front) are part of the design which produces the downforce that keeps it stable at speed without the need for a spoiler increasing drag. Idiots who lower their car to get an "even" look throw that feature away and may experience considerably reduced stability at speed. If you lower your car, make sure you keep the rake intact. Lowering will also reduce the drag coefficient somewhat btw.

AU N EGL

HERE is your ANSWER and Video too

PowerLabs

That's not really an answer... The car in question probably has its value a few times over in mods and labor. Suggesting the OP get a 1000HP twin turbo kit makes as much sense as telling him to trade up for a ZR-1 since those go 200MPH from the factory.

not08crmanymore

Where is there room to go up to that speed??

PowerLabs

Texas, Utah, Nevada, Arizona, New Mexico, Upper Peninsula Michigan... I've driven some roads in those states where you can go for half an hour at a time without ever seeing another car on the road.