RWTD

Today (Sunday, Dec. 17, 2007), at Hub City Dragway in Hattiesburg, MS, I managed to get my "tune only" black '08 Z06 down to an 11.1392 @ 129.35 with a 1.7838 sixty. This was on the factory tires, which have about 3/4 of their life gone (I've been having fun these last 5500 miles, hehe). I believe I could have gotten an 11.0x out of the car (and quite possibly even a 10.9x???), but, alas, it was not to be, thanks to the factory clutch giving me fits (it's been slipping on/off since approx. 250 miles), plus a slight wind deficit.

Runs of the day were (in no specific order):

11.1392 @ 129.35 - 1.7838 sixty
11.1619 @ 126.87 - 1.7554 sixty
11.2228 @ 127.15 - 1.8468 sixty (full operating temp)
11.2386 @ 126.05 - 1.8084 sixty

(Note: All the above runs exhibited some clutch slip at some point within the run, unfortunately.)

Though these were not records, they definitely were not too shabby. I was quite proud and happy of the car and my driving. I received quite a few compliments, so thanks to everyone for such, as they are much appreciated. Those haters who were doubting my mods = suck it!

There were two other Zs at the track, an '07 black, and an '08 silver, tho the silver never ran. The '07 black was running in the 11.7 @ 124 range (the last I saw). This was with a CAI and tune (not sure of any other mods). BTW, if that owner is reading this, please send me a PM!


Weather & Conditions:

http://www.wunderground.com/history/...lyHistory.html

http://wahiduddin.net/calc/calc_da.htm

- Temperatures were awesome - 41 to 48 degrees for the most part.
- Track runs West to East.
- There was some wind from either the NW, NNW, or N. It averaged around 15 mph at the start of the racing, and was down to around 5 mph by the end of the racing. Not ideal, but wasn't too bad.
- Density Altitude ranged between approx. -800 and -1200 feet during racing hours (2pm = -812, 3pm = -815, 4pm = -912, 5pm = -1199, 6pm = -1345). Elevation of Hattiesburg is approx. 161 feet, depending.

Vehicle Conditions:

- Stock tune power = 464.61 rwhp and 432.31 rwtq SAE (Dynojet 224xLC, 89-90 degree temps).
- Custom tune power = 474.29 rwhp and 442.89 rwtq SAE (Dynojet 224xLC, 89-90 degree temps).
- Fuse was removed for exhaust. All launches were with the clutch ridden out of at least 3200 to 3500 rpms, so due to the fuse removal, there was some slight power advantage to be had in those rpm ranges (approx. 6-8 rwhp and 10-12 rwtq more than with the fuse replaced).
- Curb weight is slightly more on the 2008 models, due to the new TR-6060 trans. However, I do tend to wonder if the TR-6060 is any more efficient than the T-56?

Driver Mods:

- This was my 1st pass down the 1/4 in my Z, tho I have ran a few different times with it at the local 1/8. However, I have not ran at any 1/4 in over 2 years, regardless of vehicle.
- TC was OFF on all runs (Active Handling ON only).
- All runs were performed with powershifting (not lifting the throttle - all shifts were as quick as humanly possible).


Upcoming Mods:

- Clutch & flywheel swap (thank you Spec!).
- A&A Corvette Vortech system (thanks Andy!).


Please feel free to ask any questions. All props are welcome, as well.

Regards,

James

'06 Quicksilver Z06

Nice runs

11.1392 @ 129.35 , thats fantastic for just a tune and pulled fuse.

http://forums.corvetteforum.com/show...post1561645378

McMung

What clutch will you be going to, and are you looking at a really lightweight flywheel?

RWTD

Thank you kindly! I just submitted my timeslip and info. FYI, the timeslips were being cut in half when both lanes were being used. My guess is to save all the trees we're killing around the track with the emissions, hahaha!

I had considered the twin disc series. However, after hundreds upon hundreds having great luck with the Stage 3+ (the "plus" model) in the 500/600/700 rwhp Terminators, I decided to go that route for my first choice. Hopefully they will have a light pedal option, like they do for the S197 Mustangs. As for the flywheel, I'll go with either a Spec flywheel or the factory replacement.

Thanks!

James

jamie furman

Wow thats some strong runs! I didn't even realize there was a tune for the Z06? 475rwhp is pretty stout!
Good driving and nice runs!

Hatdude

You're on "factory tires", presumably in cooler weather which the engine loves but tires hate and you're able to power-shift *all* shifts? How much wheelspin did you get on the first two shifts?

I only ask because we've been hearing over and over not to powershift on stock tires at the track due to wheelspin.

Awesome MPH regardless! Congrats!!

High 11s

One quick question,

When you say TC off....does that mean competition mode? I think that's TC off and AH on.


Btw great runs.....I have seen times on the Z06 anywhere from 12.90 to the very best 10.90. Wwe just picked up our 08 Z06 the day before Thanksgiving, but the weather has been so poor I have only driven it twice! Sure hope I can get into the 11's with it. You had some very stong 60 foot times also.

Can't wait to see how this car will run....seems very strong and should be a car that can finally keep up with my '80 (11.76 @ 118mph best et so far).

James

dgdoc

Terrific job James - Congrats!

As far as powershifting with stock tires -
This is a case where the Torque Management (TM) kicks in and closes the throttle down to approx 44% for .2 of a second - regardless of the fact that your right foot is planted on the floor.

So although TM is helping limit wheelspin on the shift, not sure powershifting is buying you anything with stock tires (and it is hard on the tranny).

James - Is TM still enabled on your car?

RWTD

Thanks Jamie! BTW, you "didn't even realize there was a tune for the Z06"? I know you know better, lol. Me wonders what you could extract from your beast with one?

Very very little. The track was prepped quite nicely, and the cool weather didn't seem to affect it too much at all. There were a lot of vehicles keeping the heat in the track. A slightly slipping clutch "helped" the matters some, too.

No sir, I just had the TC OFF.

There are 4 different scenarios:

1: TC and ACTIVE HANDLING = ON (default)
2: TC = OFF and ACTIVE HANDLING = ON
2: COMPETITIVE DRIVING MODE - See my post #11 below.
3: TC and ACTIVE HANDLING = OFF

I don't think you'll have any issue whatsoever, heheheh! BTW, have you owned a C5 or C6 prior?

Doc, no sir, my TM is still enabled. As you said to Hatdude, my throttle does close during the shift, regardless of powershifting. I believe this is part of the Powerhop strategy.

As for it being hard on the tranny, no doubt! I'm not advocating anyone do this. I have the benefit of being able to have this repaired without being inconvenienced, so I'd advise others not to necessarily take risk here.


Thanks everyone!

James

MTIRC6Z

Please correct me if I'm wrong but I was under the impression that TC off and Competition Driving Mode were effective the same thing? If not, what's the difference?

Cheers, Paul.

RWTD

Paul, there are 4 different scenarios:

1: TC and ACTIVE HANDLING = ON (default)
2: TC = OFF and ACTIVE HANDLING = ON
2: COMPETITIVE DRIVING MODE - see note below.
3: TC and ACTIVE HANDLING = OFF

COMPETITIVE DRIVING MODE = a relaxed version of ACTIVE HANDLING. This allows the driver to have full control of the rear wheels while the Active Handling System helps maintain directional control of the vehicle by selective brake application. This involves less intervention than with both the Active Handling System and Traction Control Systems on. The instrument cluster light will not be on. The Traction Control System will not be operating.

Please see Ranger's thread here for more info:

http://forums.corvetteforum.com/show....php?t=1862766

Regards,

James

MTIRC6Z

That explains a lot. From merely reading the owner's manual I was not aware that Comp. Mode was so different from just TC off.

Cheers, Paul.

Dr.Ron

NICE JOB!

I'd like to see you try NOT powershifting the 1-2 shift & see it's affect on your ET.....

Congrats!

Ron

RWTD

Provided the shift was performed quick enough, do you feel this would give a positive effect, or potentially hamper the time?

Thanks Ron!

James

GaryZ06

Running with the Devil.......Great runs

Dr.Ron

I think the tirespin from this would HURT your time....that's why I suggested it.

Ron

linutux

GREAT RUNS!!!

What is your redline set to?

At what RPM are you initiating the power shifts?

jamie furman

[QUOTE=RWTD;1563205852]Thanks Jamie! BTW, you "didn't even realize there was a tune for the Z06"? I know you know better, lol. Me wonders what you could extract from your beast with one?


Actually I wasn't aware of any tune for the Z06? I have heard of HP tuner but I thought that was more of a run log recorder? I haven't read on any of the websites before you posted of anyone having a tune and with all the Z06's out there you would think if something was available that actually worked all the modders would of already had it? I have read on one of the sites where they were playing with timing and fuel ratio's but the cars didn't respond as expected and actually lost hp when leaned out in some instances. What is CAI and is that your tune? Did you do a before and after dyno? You said to ask questions so I am asking?

dgdoc

Agreed - From the data I've looked at the amount of wheelspin with the stock tires on the 1-2 shift is already pretty significant - and this is WITH TM "helping out" on a full-lift gear change. Even with TM, the amount of additional tire-spin on a powershift of 1-2 would likely not result in the best possible ET.

mercruiser

Hey James. Good job my friend! I thought your car was an 07. Did you get a new one?