When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I couldnt get passed 125 mph on the big end for the life of me... Lol..I know i need work on my 60' but with the mods and tune i have i assume i'd be atleast 132-135. These 2 first passes tonight were screwy to begin with. Tried burning out in 2nd and i stalled both times here... (Ameteur night for me) any how.. I restart the car and proceed to make a pass forgetting to turn off the traction control (both times). 1st pass i rev to about 3200 and try to ease it in before going WOT. Shifted as close to 7k the best i can watching the tach closely. Never missed a shift but hit the limitter once on the 2nd pass. Both runs were pretty identical as far as my technique but gave a little too much clutch off the line on the 2nd pass which resulted in some wheel hop. But still never got the mph i was expecting. And I have no clue to why...
There was a 3rd pass where i successfully burnt out in 2nd without stalling and killing the TC. But this time i tried to copy the clutch slip off the line on my first pass but ended up bogging really bad. Once car picked up i shifted 1st thru 4th almost flawlessly really close to 7k. On that final run i 60ft 2.32, 1/8 8.83@94mph 1/4 12.10@ again 122.4.
There was a gentleman there with his red c6 zo6 running in the 136 with almost the same mods. He was trying to help me out between passes but never got to go over my slip with him. (Thanks btw if you are on here ) my car is a 2006 z06 with stage 1 heads from hpa, blower cam, arh 1-7/8 headers, catless arh x-pipe and corsa sport out back, everything else is stock like clutch, intake, rear gear ratio. Running 19's with MT 305/35/19 et street ss.... Are these 28" tall tire kiling my mph? Or did i just open up a can of worms here?...
Details i forgot to mention:
- right before i left for the track i replaced the clutch fluid 3 times to get clear. Best i can do is a light beige color. Had a coffee color prior to change.
- drag radials @18psi (i set this at the track prior to pass #1)
- did not have pedal issues prior or during these 3 passes.
Even for a 540rwhp/510 torque car? I feel my mph is sub-stock range. Im just concerned about continueing to practice at the track while there is something slowing me down the way the car sits. Maybe i just need a driver mod...
Last edited by Yella-Zee-427; 10-29-2016 at 10:20 AM.
Not sure how much rwhp you are making, but it is likely >500 and in last night's air you should have been trapping much higher, regardless of your high ET's. I suspect it is driver related...hitting the limiter can kill mph, among other things.
Even for a 540rwhp/510 torque car? I feel my mph is sub-stock range. Im just concerned about continueing to practice at the track while there is something slowing me down the way the car sits. Maybe i just need a driver mod...
Whoops...did not see this post prior to my last post. So yes, with that amount of power and last night's DA you should be easily at 130+.
Well the 60' certainly isn't there, but if you're running 11.7/11.8 consistently,you might need to question the RWHP & TQ #'s you say the car's making...
It appears that the car is way down on power or you are not effectively putting it down. (I would tend to believe my first hypothesis.) It should be trapping well over 100 mph in the 1/8 and mid 130s or better in the 1/4. Those tires are not optimal, but they are not causing the issue(s). You state that you are shifting into 4th. This should not occur if you have stock gearing and shifting at 7000 rpm. Those tires will get you to or very near 130 mph in 3rd. It would be beneficial to datalog your car during a pass to see what is going on. In addition, a video would help us sort out your launch.
Gary: You're totally right. I relied on the current tune/dynosheet as my insurance at the track. I just ordered a HPtuners unit to help me in cases like this in the future (hopefully this will be one of only a few..lol) . I know better not to fly blind at the track. What happened was i got excited on what the dyno sheet said and got anxious to try and put it down on a timeslip. Obviously i need to recheck tune, re-dyno and re-evaluaute the entire car mechanically with my tuner. Hopefully it's a simple as a re-tune.
My car is "only" 485 RWHP & 426 TQ and I run low to mid 10's in cool weather...
So trust me, dyno #'s on paper mean nothing......
Hell on the hottest of summer days @ 3000+DA, I'm 11.50 all day long at 62% WOT...
Don't rely on dyno #'s....Like I said, they don't mean much...
Its how your car performs and what you paid for that matters...
Here is an great example of a well driven stock C6Z on the same DRs that you ran. Note his trap speeds throughout the day.
Originally Posted by Dr.Ron
Year of the Z06:2011 Carbon Edition
Tires used on the pass:MT ET Street drag radial 305 35 19
Performance Mods (if any):100% Stock
Category submitted for:Bone Stock except Non stock tires
60'.............1.738
330'...........4.775
660'...........7.229
660’ mph...99.63
1000'..........9.335
1320'..........11.122
1320’ mph…127.25
Name of the track:Atco Raceway
Date of pass:12/14/14
Weather conditions: (include Density Altitude, if known):43*, cloudy.
Image of complete Time Slip
Link to Corvette Forum thread containing report: Not worth a thread
So after over a 3 year hiatus from drag racing, I felt the urge to run my 2011 Carbon Edition Z06. It was my first time running this car. I borrowed a set of 19" chrome 5 star Z06 wheels with MT 305-35-19 drag radials from Gary2004Z06. They are approximately 2" TALLER than the DR's I used on my 09Z when I ran 10.75. I knew they'd hurt, just not how much.
I didn't have to shift into 4th on any of my passes, like I normally would. I made 4 passes. This run was my best of the day, and was my 3rd pass. The other 3 were 1.8x 60' & 11.3X @ 126-127.xx.
It was good to get back out there, but was weird not doing it at a rental, like I was used to doing....
Anyone know how much a 2" taller tire hurts a run due to de-gearing, weight, etc?? Naturally I was rusty, but I feel the slower times were mainly from the added weight of the wheels & tires and the MUCH taller 19's. I'd have to get custom CCW's or something to fit over the Carbon Ceramic brakes, but I don't really drag race anymore, so I'm not willing to shell out the $2G's for a set up.
I posted because it's my 3rd car on the fast list. lol
Ron
Thanks for the reference Gary. Theres definitely something going on with my car. Clutch perhaps slipping causing me to revv excessively quicky up top and needing to have to shift into 4th on the back end? Trans issues? I wish i had someone video tape me on my passes lol. I can definitely say the car stays squatted the whole pass other when shifting. And its like 1/10's of seconds shifting 1-4. No rpm surging whatsoever on these passes either.
The rule of thumb has always been that ET tells you how well you are putting whatever power you have to the ground...MPH indicates how much power you are making...
If your MPH is down, you are not making the power you think you are, for whatever reason...
Last edited by Fuzzy Dice; 10-30-2016 at 06:17 PM.
Today Josh (HPA) went over the car. Test drove it with datalogger then onto the dyno. Made 3 pulls best was a 522/497 after a good cool down and some fuel added to the tables. Other pulls were within 10 hp. It was a bit lean on the first pull. We were discussing on how I may have got a bad batch of gas and forced the car to take out some timing. killing my power that night. Also clutch did not show any drivability issues but still may indeed be slipping up top twds 7000 on shifts. I am looking to make another trip to the track with better fuel and a datalogger to see where the car stands from there. That and a better 60' is needed to cancel out driver mod and octane. A track rental would be handy right about now..
Was at Atco last night and gave it another shot this time with MS109 in the tank. dA from internet said -129...
1st pass: launched at 42xx slipped in clutch and hammer it once hooked, went to grab 2nd just to find pedal stuck to floor. Aborted pass.
2nd pass: replaced clutch fluid prior to pass. Launch at 4xxx eased in clutch and bogged bad, failed to give enough gas during the bog down. aborted pass.
3rd pass: launch 42xx, anticipated the bog and countered with enough throttle, sky rocketted forward, shift at 7kish grab 2nd, floored it pulled hard till about 5500-6000 and nose dropped as rpm flashes to 7kish like it went into neutral but clutch pedal was up, pedal to floor but no power. Aborted once again and packed it up to save my slipping clutch to make it home 1.5hrs away. Drove home babying clutch and made it. Drives fine shifting >3k. Got home and clutch was still smelling...
After a new RXT clutch, a Mamofied MSD Intake , halltech mf108, and some seat time, Ive managed to improve. I need to get my 60' down to sub-1.7's. Been playing with my clutch release and timing and its worked. 10's are a **** hair away... this was last night. Ran a string of 11.0X and 11.1passes the week prior but gained 3mph by bettering my clutch slip out the hole. Was Running 19psi on the 17" Hoosiers DR's.
Last night @Etown.
10-29-2016, 12:11 AM
Etown tonight with mph issues...
