racing my 66 Comet

[Jim Comet]

I am running my Comet at Grove Creek this weekend and to play off of the guess my hp threads, how about guess my ET? I will post my results on Sunday.

Performance Summary:

   1st time out with new motor and car set up: June 2019
      1/8 mile ET: 7.559               1/8 mile MPH: 95.26
      60 foot time: 1.54
      Track: Grove Creek raceway, MN

    40 passes later/car is getting sorted out: October 2019
      1/8 mile ET: 6.811               1/8 mile MPH: 99.79
      60 foot time: 1.463
      Track: Rock Falls raceway, WI

      1/4 mile ET: 10.74               1/4 mile MPH: 124.50
      60 foot time: 1.463
      Track: Rock Falls raceway, WI


Vehicle Use: Bracket racing strip only
(For example, occasional strip use, street/strip with regular strip use, or strip only)

Vehicle Specifications:

Model Year: 1966

Model: Comet

Style:2 door hard top, subframe connectors and 8 point roll bar.

Engine Details : See my guess my horsepower post for specifics: 416ci dyno'd at Jay Browns 600hp@6800rpm

Transmission: C6 fully rollerized. Low ratio kit. 1st/2.72, 2nd/1.54 and 3rd 1:00 NO trans brake. Will leave off of 2 step.

Torque converter details (if automatic): ATI 5000? stall, Spec'd by Blair Patrick

Clutch details (if manual):

Driveshaft: 3" stock big block shaft w/upgraded yoke.

U-joints: 1330/1350 performance joints

Rear end type: 9 inch Yukon aluminum center.

Differential type: 35 spline PEM spool

Gear Ratio: 4.11
 
Axles:35 spline Quick performance

Front tires:Moroso 6.5-15?

Front wheels: Centerline Convo pro: 15x4

Rear tires: M/T slicks 28x9

Rear wheels: Centerline Convo pro 15x8

Front suspension information:custom home made. similar to stock. but shock towers removed. w/Afco single adjustable shocks.

Rear suspension information: 2" leaf springs with home made Caltrac style bars. poly spring bushings. Caltrac single adjustable shocks.

Ready-to-race vehicle weight, including driver:3560 lbs, fiberglass bumpers, fenders and deck lid.

[6667fan]

I like the format here but cannot supply a guess.
An observation however. I will be surprised if you get to your peak hp rpm in the traps. That is a tall tire combined with the 4.11s.
Do you have any data loggers on board besides eyeballs?

Good luck and have fun!
JB

[e philpott]

that's a lot of First gear with 5K stall , if it dead hooks should be a blast

My guess 6.9?'s at 102-ish MPH if it hooks

[gt350hr]

   6.60 @ 108 w 1.42 60' hope you go faster than that though.
      Randy

[blykins]

7.20.

[Stangman]

6.78 @ 102.80. I would think your car weighs less, do you run a full interior? Still sticking with my guess my car is 250 lbs less but I have 50-60 HP less and I run 7.08. Good luck!!!

[BattlestarGalactic]

Lack of gear(only 4.11) will slow the 60ft down a touch even with the loose converter(my opinion, may be totally wrong).  That is the same tall tire I run(but 10.5")

You're 250# light of my car/driver, and 25 hp down.

I think you'll be 7.0's, but MPH will be questionable.  It will likely not pull hard until after the 1/8 mile.  I run 96-97 mph commonly.  I think you will be a couple under that.  (my guess, again might be totally off).

60ft?  Once you get the shocks set, it could get really good>  How lucky you are the first day?  I think the 4.11 gear will still be a hindrance.   Mid 1.5's,

[Jim Comet]

I do have front race seats, carpet, factory interior trim panels and the rear seat in it. Jim

[JamesonRacing]

First time out with the car and combination?  7.90.  Should go 7.00 when you get the bugs worked out.

[gt350hr]

   You have the same low gear ratio as a 4.57 with a stock C6 That along with a 5,000 stall convertor WILL leave well. My combination runs 7.0s @ 98 ( 1.48-1.50 60') with 75 less HP and 600 less lbs. You have MUCH more torque than my 331ci SBF . if your corrected altitude is around 1,000 or less you will run good numbers. If it's above that you might only run 6.90s. My '67 Ranchero with a 408W ( 480 hp) C4 with stock 11" convertor , 4.30 gears and 275 drag radials went 8.0s through the mufflers  right off of the street and the weight is at least what yours is. You will be over a second faster with more , more , more.
   Randy

[thatdarncat]

   .... if your corrected altitude is around 1,000 or less you will run good numbers. If it's above that you might only run 6.90s...

Actual elevation of Grove Creek is around 1140’, forecast for Saturday is for a high of 90 and pretty humid, so corrected altitude will be much higher. Spring & fall we can get some pretty good air days occasionally, especially when the temps are in the 30’s. A couple times at Grove Creek we’ve had to wait in the morning for the water to thaw in the burnout box before we could race lol.

[jayb]

I'm going to guess 7.45, but I hope it goes faster...

[Jim Comet]

Thanks everyone, I am loaded and set to head out. Car starts and runs flawlesslay in the driveway Hopefully it works tomorrow. My guess is 7.20 by the end of the the night. Jim

[thatdarncat]

[Jim Comet]

What a day, the good, the bad and the ugly. Our day started when I drove the motorhome towing my car through a dip in the parking lot where I used to park 12 years ago. Parking here allows the RV to sit on level ground while the trailer tires are in the dip which allows me to load and unload my car without using ramps. WELL the dip is now deeper and the bumper of my RV got hung up and I was stuck. Fortunately a fellow racer unhooked his trailer and gave me a tug out. OK unload the car and get to tech. Wait these new rear leaf springs I put on took a set while I towed to the track that was about 1 inch lower than they were before. Now my 29.5x9 slicks are ripping my wheel lip mouldings off. No way to run these tires today. Fortunately my brother is on his way to watch and happens to have a pair of 28x9 slick with him that I can use. We mount the smaller slicks and are in business. First pass I launch pretty hard and lift part way through the run since this is a brand new car setup. 1.71 60ft and 8.0 @83mph. Ok for a test hit. Nest pass I launch #3000rpm (as high as my brakes will hold) and get a 1.71 60ft time and 7.61 @93mph. Not what I hoped for but the car drives great. I make one more pass with the same results and decide to hand the driving to my son. He has not driven a drag car so he took his first pass easy and got a 7.96 @82mph with a 1.73 60ft time. I then decided to check the timeing and found we were only running 28 degrees advance. I bump it up to 33 and send the boy back out. He runs a 7.94 becuase he had to lift but he also had a 1.54 60ft time. Through all these runs we have been having shift light and rev limit issues do to a wacky ignition box which will be replaced. My sons next pass and the last one of the day was another 1.54 60ft time and a 7.56 ET @95.26mph. We went back to cool the car and when we went to check air pressure the right rear slick was flat. These slicks were not screwed on and while it didn't appear to rotate on the rim the valve stem on the tube had been torn. That ended our day before we could address our shifting and rev limit issues. So my best ET was a 7.559 @93MPH and a 1.71 60ft. If we can put the 1.54 60ft times with better shifts I believe we will be seeing 7.20-7.30 pretty easily. And it was 87 degrees today.  I am going to buy some new better sized slicks an give it another go. Engine ran great. Thanks Blair. Also thanks to Steve and Kevin for thier help. Its much appreciated. Jim