Finally made it to the track.... NEW UPDATE: SEPT 27, 2020

[Canadian1968]

I finally made it to the dragway here in Ontario. I only did 2 runs.  First time had the car to the track since basically having the car torn apart from front to back over the last 6 years.  

BF G-force sport 2 Tires, no burnout, Off idle launch . I let off just after hitting 3rd.  Not gonna lie , the nerves were going full steam, with the trouble I have had with the car in the past I wasn't going to push my luck !

Here is my best my best time

60Ft - 2.27
330ft - 6.05
1/8 - 9.08 @ 81.68
1/4 - 14.00 @ 88.6

Some spin off the start , and I could hear the tires chirping threw most of 2nd.  I think its pretty obvious by my 1/4 mile mph. I let off pretty early lol, I may have even tapped the brakes before the line !  Not my first time down the track but first in this car, wow what a difference compared to a modern car !

I know some of you guys are pretty good at giving estimates based on 1/8 times, just curious what you guys think my 1/4 could be if I stayed on it threw the traps?

[c00nhunterjoe]

The 9.0 1/8 comes out pretty much where your 1/4 mile time already is. Low 14s. If you scrubbed anything it wasnt much. No reason you cant get a 1.9 60' on those tires with some practice.  From your current et that would get you to the 13.50s.

What is the combination?

[mr. hemi]

Also, which track were you at? Some prep better than others.

[BSB67]

With that 60 ft time, about 13.80 @ 101.5.  Almost every street car that we ran in that power/performance range could 60 ft. close to 2.00.  I have these time slips:

60ft..........2.252...................2.064
330ft........5.970...................5.722
1/8.......8.994@81.53......8.720@82.18
1/4......13.804@101.3.....13.499@102.56

[Canadian1968]

well I am hoping to make some more runs before the year is done.  I figured I should be hitting at least 97mph . Boss did 14.2 at 97mph in his 440 67 GTX.  The difference in time and mph baffles me !  I know there has to be some legitimate science behind it though .

[Canadian1968]

http://www.dodgecharger.com/forum/index.php/topic,121570.msg1511385.html#msg1511385

thats the setup ..forget the exact numbers but compression  was worked out to 9.8

The track was in St.thomas ( sparta raceway ). I know they did not used to prep the track o Friday test and tune nights . And the left lane I did both my runs in is notoriously the worse of the two . The track is under new management and I am being told that they are prepping on the Friday nights now.

[BSB67]

well I am hoping to make some more runs before the year is done.  I figured I should be hitting at least 97mph . Boss did 14.2 at 97mph in his 440 67 GTX.  The difference in time and mph baffles me !  I know there has to be some legitimate science behind it though .

that's because you lifted.  There is no correlations you can make.  Keep your foot in it and the numbers will line up properly.  When you lift the et doesn't change a lot, the mph does.

[TexasStroker]

You have to get back to at least break into the 13s...Can't run a 14.00 dead even and not get a 13.9 before the season ends.

Stay in it and see what it will do...then get back at it and keep shaving a little time.

Most of all, have fun!

[Canadian1968]

Made it to the track tonight . Was only able to get 1 run ..... long story .

I did a small burnout , basically just cleaned off the tires .  I barely loaded the TC ( 1500) . But I rolled into the throttle instead of an abrupt punch.  Results as follow .

60ft - 2.10
1/8 - 8.77 @ 83.03 mph
1/4 - 13.45 @ 104.6

Super pumped !  I know the car still has a little more in it off the line !

[BSB67]

Made it to the track tonight . Was only able to get 1 run ..... long story .

I did a small burnout , basically just cleaned off the tires .  I barely loaded the TC ( 1500) . But I rolled into the throttle instead of an abrupt punch.  Results as follow .

60ft - 2.10
1/8 - 8.77 @ 83.03 mph
1/4 - 13.45 @ 104.6

Super pumped !  I know the car still has a little more in it off the line !

I'm pumped for you!  Congratulations!!

I like that mph much better.

[c00nhunterjoe]

13.10s with a little more practice.  Great job. Do you have weather numbers?

[BSB67]

I think I posted this awhile ago:

So to make clear, this is where I think the key pieces to the puzzle are:

1) Your compression ratio is probably between 9.2:1 to 10:1, depending on CD, gasket thickness and final head volume.  Unless you have detonation, av gas will not help, if you do have detonation, it will help a lot.  Do you know your actual CR, and cranking cylinder pressure?

2) Your heads should flow 230 to 235 cfm, IMO.  Do you know actual flow?

3) Race weight is probably 4000 lbs.  Do you know for sure?

4) the DA during track time was probably 2500.  Do you know what the DA was?  If you give us the track name, dates and time, we can check that.

If those things above are generally true, and we take the leap that if you kept your foot in it through the traps, the car would have gone 13.85 @ 101.5 mph, I think I can make some general conclusions.

1) Changing nothing, and practice driving to achieve a 2.05 sec. 60 ft should put you in the 13.50s at 102 ish.

2) My experience indicates that folks that are relatively new to running at the track can find another 0.1 or 0.2 in et and 1 mph in driving technique even after the 60 ft is down to 2.050.  Shift points matter especially on a tight converter

3) My experience also indicates that getting real serious about your tune will find another 0.1 or 0.2 in et and 1-1.5 mph.

With that, I would guess that there is a 13.3 @104 in the car, maybe a little more.  If number 2 and 3 above don't get you to 104 mph, I would say some horsepower is missing somewhere based on the parts you have.

[Canadian1968]

Sorry don't have much on the weather . Probably about 16 *C . humidity maybe 60% .  Don't know what else to tell ya... felt like a good night for racing ... ND thr track was packed haha!

[Canadian1968]

That's it for this year.... 

I'm pulling the grill out for a clean up and fix a bunch of broken spacers .

My goal is 13.0 for next year, it's an aggressive goal but I think the car has it. Few things I have yet to do,

- Unbolt the sway bar.
- Pump the fronts up to 40 psi
- Try shifting it manually - all runs have been left in drive so far
- Get some more data on my WOT A/F ratio
- Work on that launch !

[BSB67]

Sorry don't have much on the weather . Probably about 16 *C . humidity maybe 60% .  Don't know what else to tell ya... felt like a good night for racing ... ND thr track was packed haha!

Just tell us the name of the track, the day you went, and the time of day.  All of the weather data is available on-line

[BSB67]

That's it for this year.... 

I'm pulling the grill out for a clean up and fix a bunch of broken spacers .

My goal is 13.0 for next year, it's an aggressive goal but I think the car has it. Few things I have yet to do,

- Unbolt the sway bar.
- Pump the fronts up to 40 psi
- Try shifting it manually - all runs have been left in drive so far
- Get some more data on my WOT A/F ratio
- Work on that launch !

Unless you've work at getting the auto shift to shift up higher and correct for both 1-2 and 2-3, there could be more there than you think.

[Canadian1968]

St..thomas Ontario

Elevation 209M
temp - 18c
humidity - 52%
pressure - 101.50

I have no idea how this stuff works

[BSB67]

The 5 pm conditions at St Thomas Raceway Park were: 67°F, 59% RH, 30.01 in Hg, track elevation 741 ft above sea level.  DA was 1488.

Corrected et/mph are 13.23 @ 106.4.  If the car and driver are 4000 lbs, that's about 375 corrected net engine hp.

[cdr]

The 5 pm conditions at St Thomas Raceway Park were: 67°F, 59% RH, 30.01 in Hg, track elevation 741 ft above sea level.  DA was 1488.

Corrected et/mph are 13.23 @ 106.4.  If the car and driver are 4000 lbs, that's about 375 corrected net engine hp.

I think thats really good power for a very mild 440, keep at it & you have enoughHP for for a high 12, my old car I had ran 12.72 @ 106, it was also a heavy 4000lb pig.

Well Done !!!

[Canadian1968]

The 5 pm conditions at St Thomas Raceway Park were: 67°F, 59% RH, 30.01 in Hg, track elevation 741 ft above sea level.  DA was 1488.

Corrected et/mph are 13.23 @ 106.4.  If the car and driver are 4000 lbs, that's about 375 corrected net engine hp.

Where did you get the weather info from ?
and net HP, so is that estimating rear wheel hp ?

[BSB67]

Dragtimes

No. Net flywheel horsepower is as the motor sits in the car, corrected to std conditions.

Engine dyno is usually gross corrected hp.

The difference is that usually on the engine dyno there is no air cleaner, no fan, no power steering pump, no alternator, maybe no water pump drive, no full exhaust.

[cdr]

Dragtimes

No. Net flywheel horsepower is as the motor sits in the car, corrected to std conditions.

Engine dyno is usually gross corrected hp.

The difference is that usually on the engine dyno there is no air cleaner, no fan, no power steering pump, no alternator, maybe no water pump drive, no full exhaust.

This is the one I use for DA. weather at Tracks  https://airdensityonline.com/

[cdr]

o

[Canadian1968]

So made it out to a Private Track rental at the other local drag strip ( Grand Bend, Ontario )

This track is well known to be the better of the 2 local.

I had plans on trying so many different things as far as tuning, but as I got going I just wanted to work on my technique.  I did change tire pressure back up to 30 lbs,  and I have added clamps to rear leaf springs since last time out. Also I have installed a line lock system and was doing burnouts this time around. Finally I also started shifting manually.

I noticed my tach  acted much differently when i started to shift manually. In drive it climbs consistently but when I was shifting it manually its seemed "jumpy" the best I can describe it, I did my best to shift at 5300RPM.

Times as follow

60ft   2.143     2.147    2.047    1.964    2.161    2.014

1/8    8.910     8.774    8.555    8.473    8.656    8.501

MPH   81.25     81.80   82.91     83.21    83.41    83.11

1/4    13.74     13.58   13.31    13.22    13.38    13.24

MPH  101.93  102.7   104.32   104.31   105.22  104.83

So my new personal best is 13.22 @ 104.31 with a 1.9 60ft

The 105.22 MPH pass I actually spun off the start.  I was able to launch the car a lot better, but still rolling into it , to much and I spin.  There was actually a decent headwind at the track as well , not sure how much that effected things. 

I couldn't seem to find the track on the dragtimes website for the corrected ET.

But I think with a bit more tuning and practice I can hit that 13.0 I have been looking for !!!

[cdr]

Great job,,, MUCH better , keep at it & you are doing very well.