60' time and ET question...

Kappa · 11-09-2009, 10:54 PM

Is there any rule of thumb on how much your 60' time changes your ET?

I have a bolt-on FRC and on 3 year-old takeoff Michelin PS1's I cut a 2.13 60' time(went 12.81 at 113 on that run). They wouldn't hook on anything past a 2500rpm launch and was losing serious traction on the first 2 shifts.

Horrible I know. I don't have any money for DR's but do have some fairly new Nitto NT05's on the car now. Will my ET change significantly if I get that 60' down to 1.9-2.0 or so?

evo2ls1 · 11-09-2009, 11:05 PM

i swapped to nitto drags and pulled a 1.80 down from 2.1 dropped 3.5 to 4 tnths off each run depending on my shifts, so dropping the short time will definitely show

j0n · 11-10-2009, 06:24 AM

Your ET will definitely improve. Just how much is hard to say. I HIGHLY recommend that the next "mod money" you decide to spend is on good drag tires. THEN your ET will change significantly, and you lessen the chance of wheelhop and broken rear parts.

For reference my bolt-on car(making only 333rwhp) went 12.151 @ 114.63 on a 1.825 then did 11.958 @ 115.06 on a 1.773 on the same day in the same DA.

clemsondave · 11-10-2009, 07:01 AM

0.1 in RT ~= 0.2 in ET

98vettedave · 11-10-2009, 05:09 PM

Quote:

Originally Posted by clemsondave

0.1 in RT ~= 0.2 in ET

Dave,I think you meant to say that a .01 improvement in 60' will equal approximately a .2 improvement in ET. As we all know RT can determine the winner or loser of a race,but it does not affect the ET.

clemsondave · 11-10-2009, 05:11 PM

Quote:

Originally Posted by 98vettedave

Dave,I think you meant to say that a .01 improvement in 60' will equal approximately a .2 improvement in ET. As we all know RT can determine the winner or loser of a race,but it does not affect the ET.

lol, yep. Brain to finger disconnect.

But you did it too! It should be 0.1 in 60' = 0.2 in ET. Not 0.01 to 0.2.

98vettedave · 11-10-2009, 05:15 PM

Quote:

Originally Posted by clemsondave

lol, yep. Brain to finger disconnect.

But you did it too! It should be 0.1 in 60' = 0.2 in ET. Not 0.01 to 0.2.

Never was good at math.

pit-man · 11-10-2009, 05:36 PM

Quote:

Originally Posted by clemsondave

lol, yep. Brain to finger disconnect.

But you did it too! It should be 0.1 in 60' = 0.2 in ET. Not 0.01 to 0.2.

That rule only works for good drivers. I get 1 for 1.2

Ain't funny !

Pitt

98vettedave · 11-10-2009, 06:06 PM

Quote:

Originally Posted by pit-man

That rule only works for good drivers. I get 1 for 1.2

Ain't funny !

Pitt

Yeah,that 2 for 1 ratio never worked for me either. Guess I can't drive too.

YeloFevr · 11-10-2009, 06:12 PM

Quote:

Originally Posted by clemsondave

lol, yep. Brain to finger disconnect.

But you did it too! It should be 0.1 in 60' = 0.2 in ET. Not 0.01 to 0.2.

Never knew that, but it's dead on.

I went 12.000 with 1.85 60', then 11.804 with 1.75 60' at MIR.

Kappa · 11-22-2009, 12:55 AM

Quote:

Originally Posted by j0n

Your ET will definitely improve. Just how much is hard to say. I HIGHLY recommend that the next "mod money" you decide to spend is on good drag tires. THEN your ET will change significantly, and you lessen the chance of wheelhop and broken rear parts.

Took your advice and bought some MT ET Streets(275/40/17) on some C5Z wheels. My wallet wasn't too happy but I was.