Thanks for the details. With 500+ passes in C5Z and now 21 on the C6Z, I am trying to focus on the C6 platform and how it launches.

So please tell me the launch rpms you have been using with the C6 on MT ET Street (bias ply). Also have you experienced clutch pedal issues with those tires.

TIA,

Ranger

 

I will have to report back on this one, I only used the tires one day this year, and it was so frustrating, with the TM, I put them on the shelf and have been running the runflats until I had the car tuned.
I only have 4 passes on the C6 with the ET Streets, I'm still experimenting.

 

You are confirming my experience.

With a stock ECU (e.g. no tuning), a soft, sticky tire will produce worse 60' and ETs than a DR that will allow a bit of spin on the launch.

The downside of tuning out TM is the warranty concern. If you tune it and the car breaks the tranny or rear, a Chevy district/zone rep can see the tuning via Tech-II and deny warranty coverage.

So I plan to leave my ECU stock and try to find a technique for driving around TM.

Meanwhile for C6 owners with stock ECUs, I suspect your 60' will be better with DRs and carefully regulated (1) launch rpm and (2) clutch release that allows for some (3'-10') wheel spin. This approach will likely reduce the TM impact.

TM is there to reduce Chevy's exposure to warranty loses. If you edit TM out, you accept the risk of potential denial of claims involving the drive train. Many owners are willing to accept such risks in pursuit of fast times. Others prefer to remain stock and adjust their driving techniques instead.

Ranger

 

I have an '05 Z51 6spd, and a set of stock, 17" wagon wheels left over from my '99 FRC fit on the rear of my C6 just fine ! No clearance issues at all ! I am running MT ET Streets..



Steve.

 

Any chance you might answer the rest of the thread-starters question?

Knowing the wheel/tires is a start. How about the rest?

TIA,

Ranger

 

Good for you, but that info disappoints me a little. I had several people tell me they tried C5 and Z06 17" wheels and they did not fit over the brakes.

I wish I would have had the real scoop.

Good example of don't believe everything you read on here.

 

You out there, P-Colavette??

Ranger

 

Thanks for the input, but doesn't anyone have a complete answer? Full details, with 60' times, etc?

 

Perhaps bumping this to the top will get some feedback from folks who have actually put their M6/M12 with DRs on the drag strip and know the results and can articulate them.

Trying to find out what seems to work. That take cooperation from members.

Anyone?

Ranger

 

Sorry I suggested you post the question here, cmb13.

Looks like those running DRs aren't motivated to share what they've learned.

A post like this on the C5Z06 board would draw a lot of members' experiences and support for your decision.

Ranger

 

I don't think too many guys on here are running DR's yet.

 

Thanks, Ranger and all who participated in this thread. I guess we need some more time before there are enough C6's at the track in order to compile some answers. Maybe I'll get a set soon and do some of my own testing.

I am but a novice yet, but a little trial and error never hurt. I mainly posted the question b/c I've been to the track twice, for the Corvette Challenges, and found my main problem was with hooking up. Additionally, I do need to work on my RTs.

 

I will walk out to my Garage and get the tire size for you right now... I will tell everyone that I fitted an unmounted 17" wagon wheel on my buddies '05 Z51 car while he had it on a lift doing some other work, so that I could actually look/check the clearance of the wheel in a complete sweep of the 360 deg. Now, the clearance of the wheel where it passes over the brake caliper is tight, it has roughly a 1/2 inch. I believe it has plenty of clearance for cooling, as I put my D/R's on here at my apartment, and drove it 27 miles to the track ! So, anyhoo, I need another beer, and I wil get those sizes for 'Ya !



Steve.

OK, Beer Re-Loaded, and the M/T ET Streets are 275/40/17. My apologies Ranger, and everyone else for not posting this sooner, however, I have been a little busy at work. Today, on my only day off in awhile, I have been rolling around in the garage floor, installing a DIY CAI thank's to David Farmer's post on this thing ! Almost done, just need a heat gun, and a little tweaking !

 

Been to the track 1 time with my BONE STOCK C6 Z51 MN6, running 275/40/17 Mickey Thompson Drag Radials on C5 17x8.5 front wheels, along with temp tags .

I was sorely disappointed with my results. Best 60 was 1.964, most around 2.01. Best time 12.97 at 110. Most around 13.0-13.2. I could run this with my C5 with only Blackwing and Borla and it had only 300RWHP before H/C.

Ranger, thanks to reading your threads I had gotten my 60's on my C5 down to 1.6-1.8 pretty consistently following your method and was running high 11's (it had H/C). I'm no pro for sure but I'm not a beginner either and I couldn't get this car to run hard.

I just cannot keep from bogging at the line - launch hard, launch easy, same thing. Sometimes I got a little wheelspin then bog depending upon launch RPM. And when I shift it feels like the car is again bogging. I suppose this is the torque management people talk about. Even my wife in the stands asked why it seemed to die out when I shifted (I'm surprised she could hear this friggin quiet thing). This car just feels slow to me, I swear I can read a book while waiting to shift to 4th. I gotta start modding!!!

I have been reading threads on this torque management, it seems some folks believe in it, and some don't. What's the real deal?

 

Ranger,

All things equal, brands aside, do you think I'd be better off with 17" than 18"? I've heard it allows a little more forgiveness in the sidewall for twisting, and may be easier on the car. I believe both will fit, as both Joe G and CYA-VETT did have 17's on the back of his Z51 C6 last week.

Also, you mentioned you think 315's would be a good width. I know we haven't gotten the consensus we'd like from this thread, but if you were to pick out DR's for a stock C6, would you still go with 315s on 18" wheels as you stated in the other thread?

 

I'm not Ranger (I wish I could drive like him though), but I can help, DR sidewalls do not flex, so my guess it that Ranger would recommend the 17inch, this would give you a mechanical advantage of tire height.
The ET Streets' sidewalls flex. They only make a 17 inch size right now. They are taller than the 17 inch DR but more forgiving and stickier.

 

Thanks for your kind words.

With 500+ passes in two C5Zs and now 21 in the C6Z, I'd hope folks would give me credit for understanding with a normal launch feels like.

And your sense coincides with mine. TM is pulling power if the rear wheels don't spin a bit. Simple as that.

I've run 1.78 on the stock tires but my big sticky DRs won't produce better than 1.73. Pretty revealing. Raise the launch rpm by 1000 and shave only .05 off the 60' and have a slower 330'. That's the TM toll.

So you are correct. TM is a ****.

I'm doing experiments to find a launch technique that will evade TM. No luck so far. But then, I make two passes and get told to park it for violating the 11.50 lower limit. Looking toward track rentals.

Ranger

 

I'd suggest running what's worked well on the C5Z06. Reason is the similar rwhp. There are some differences between the C5Z and the C6, which need to be addressed in the specific launch techniques for each platform. The main one is the presence of Torque Management on the C6s, including the Z06.

Wheels/tires that work on the C5Z:

C5Z06 fronts 17x9.5 wearing ET Street Radial 275.45.17 22-26 psi
C5Z06 fronts 17x9.5 wearing BFG DR 315.35.17 DR 18-20 psi
C5Z06 rears 17x9.5 wearing BFG DR 315.30.18 DR 18-20 psi

I'd suggest raising the psi by a couple and being a bit more aggressive with the throttle once the clutch is out. The goal is to get some wheel spin. This may serve to reduce the TM toll. That's the theory I'm pursuing.

Ranger

 

Craig, IMHO MT ET Streets are the best for dragging, but I sure wouldn't drive to the track on them, you never know when we will get a rain shower and you will not be able to drive home. So then you either trailer tires like I will (I've just received my C6 Curt trailer hitch) or have a chase vehicle.

People drive on MT Drag Radials like I have on the street all the time. I'm a bit skittish to do so on my every day drive but people do it. Just gotta be really careful in the rain. Standing puddles are a no no - just ask Johnsea06 at the next event!

Search for his user name and look at his avatar... that was from his in car camera at homestead running R tires through a standing puddle!

 

Joe,

What are you doing posting at 9:30 on Sunday night. Don't you know the Sopranos is on???

I'm thinking you're tires are probably perfect for me. It's just that I'm a little scary obsessive when it comes to purchases like this. What did you say you're trading up to and why?

Craig