heres the deal, raced ubly,mi today. only my second time on a track, first was at the GM event in stanton, mi

anyway first run i spun bad and had to let off. heres the numbers
I1 1.966
I2 5.705
I3 8.68
MPH I3 83.095
I4 11.163

ET 13.339
MPH 108.743

now the guy next to me ran as such
I1 1.638
I2 4.894
I3 7.701
MPH I3 86.964
I4 10.113

ET 12.312
MPH 105.725


i finished 3 mph faster than him and i spun, so i can assume my car would pull faster than 12.3 if i can get it to hook right?!

what the breakdown on this?

mike

 

The first thing to consider is a car with proper traction through-out a run will make approximately 64 percent (most) of its ET in the 1/8 mile. Check the numbers and math on your runs to see if you’re close to that number. If you’re not up near the 64 percent, then your car isn’t properly launching.

ET= elapse time from starting line sensor to ¼ mile sensor.

MPH=velocity through the MPH timing trap sensors at the ¼ mile.

Everything being correct (traction, proper shift points, Etc.), there is some correlation between ET and MPH. For example; my car runs in the 11.20 to 30 ET range with a 120 MPH, which is typical. A car I race at the track runs 9.50s with 140 MPH, also a typical ET/MPH combination.

However, there are several factors that can change the typical ET/MPH relationships. For example; a high HP car could leave the line "without" good traction, causing a slow ET mostly in the first 1/8 mile. However, that high HP (once hooked-up down track) could make some serious MPH through the traps.

Also, the car next to you could be letting-off near the trap, a common bracket racing technique of dumping. Which kills a lot of MPH, but not too much ET.

Additionally, throttle-stop electronic cars typically have very-high MPHs for the ETs they run. Basically, they are holding-back ET in the first 1/8 mile, then the HP kicks-in and creates MPH at the trap.

WD

 

this was during test and tune

 

Running out of gear before the stripe can also cause low trap MPH. Again, there a many reasons for the ET/MPH to be outside of the typical relationships.

WD

 

He let off.....


Sometimes if you get a little wheelspin on a low H.P. car...it will pick up a little m.p.h....once it hooks good it loses it.

You could probly get it a little quicker if you could leave better

 

its all about your 60 foot, it seemed like for every .1 i took off my 60 i also dropped .2 in the quarter, so if you had his 60, then you may have ran 12.6 or better. my 200 auto sees a 1.88 60' 8.1 1/8 and a 12.61 @109.88

what kind of car were you running against, was it an older muscle car. I ask because our cars seem to trap high mph from our aerodynamics as to an older car or even a truck has to rely on raw power to get out of the whole. sometimes gear swaps will drop your time but also lower your mph because you are getting there sooner. some high hp trucks will run a 13.0 @ 100 opposed to a car that runs 13.0 at 106 due to the weight of the truck tends to make it harder to accel at high speeds, but if they have the right gear ratio to get them out of the hole they can run good times. I see trucks with 4.56 gears as to cars usually only need 3.73


there are many ways to break down a et time, but the best advise i can give you is get your car to hook and see those times drop. If you haven't already i would buy all the rear suspension parts. lower control arms, torque arm, panhard, and subframe connectors , and maybe a nice set of nittos(thats what i run 1.88 no spin)

my buddy has a 2000 m6 formula and has beed having traction issues and we took off the front sway bar. BIG diff me and him thought, it takes 15lbs with the sway bar and brackets removed and allows the from end to come up slightly and transfer all the weight to the rear, also he has on order the sus. parts i listed above and 245 nittos.

his previous times were 13.03 @109 with a 2.02 60 and when these parts come in we are taking his car to gateway to hit 12's Oh and also we are taking his front bumper support out for another 18lbs off the nose. With a total of 30+lbs off the front and sus mods, tires we better see a good time from his car

i did these mods to my car and am very pleased with the results and am looking forward to seeing what my buddies car can do.

 

bottom line is i need to hook. i spun bad off the line and let off till it grabbed and layed into it. from there he never gained any ground off me through the gears. i'm pretty confident my car will run low 12's, with tuning hopefully break into the 11's.