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How do you calculate a good 60' time?

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6K views 44 replies 32 participants last post by  cdmbill  
#1 ·
How do I know if the 60 foot times I get are good for the type suspension and HP I have? Is there some sort of calculator on line that shows this? I have a stock triangulated suspension on a BB 71 Chevelle with after market adjustable upper and lower control arms. Afco DA shocks and a HR anti roll bar running 1.40-1.42 now. How much more can I get out of this suspension? Let me know.
Thanks
~Dave S.
 
#2 ·
60 fts. also depend on power, the more power you have the faster 60's you CAN have if all is adjusted properly. IMO, there's always room for minor improvements, but you do reach a point where you're not gonna go 1.19 60's in a 10 sec. car... or similar.
 
#5 ·
TRZ Motorsports:

I understand more power equals better 60's. But what would a 60ft time be under perfect conditioon with know hp, gear ratio torque by using a given et?
Some times I see posts that say " for your ET you should have x.xx 60 foot". Is this just someone's opinion, BS or a calculate number from a formula?:confused:
 
#9 ·
I got the formula from another drag racing forum for stick cars called United Manual Transmission Racers on this same subject. It seems to be a good indicator if your car is in the ballpark.
Lets have a few others get out there calculators and see how close they are?

Another one is divide 1320 by mph=et. Again my own car is short on that one but other cars are pretty darn close.

I am no expert by any means but these formulas are at least interesting to run your numbers on.
 
#10 ·
Mine says I should be at 1.34. I am at 1.37-1.38 so that actually makes sense. I had Coan build me a converter to slow wheel speed down a little to help with traction and Art said I would be giving up .05 e.t. in the 60'.

In my opinion the converter has the most to do with how close you are to "optimal" 60'.

Homers442, Change of subject but what are your Afco DA shock settings for compression and rebound? I am helping a friend dial in his 70 Chevelle and he just bought those shocks.
 
#15 ·
Greg: I finally got to check my rear shock adjustments at the track yesterday.
11 from loose on the extension
12 from loose on compression.
I have cheap Monroe matics up front since my front afco's are in for repair (long story). My 60's were pretty consistant--1.404, 1.465, 1.422, 1.406, 1.404 and 1.396. This was on a cool track with a cloudy 62 degree day. I can't wait to see what improves once I get the front Afco's back on.

I should note I wasw leaving at 3000 rpm off the trans brake, Turbo 400 and 4.56 gear.

That sould get you started. Adjust from ther becaus every car is different.
~Dave S.
 
#16 ·
Interesting. Mine says 1.52- 1.53 and I'm usually 1.57-1.59. Did go 1.50 Saturday at Milan!

"I got the formula from another drag racing forum for stick cars called United Manual Transmission Racers on this same subject."

Jeff seems to have all the formulas memorized. They do give you something to aim towards, though they aren't always perfect.
 
#24 ·
LOL this is not new stuff guys, go buy a Moroso slide rule for 10 bucks Mine is 30 years old runs dead on, the turbo stuff that runs a small tire and progresive Nitrous it does not work for. Used to be everyone had one in the glove box

http://www.jegs.com/i/Moroso/710/89650/10002/-1
 
#33 ·
What if your car is already going to 60' what the calculators are saying? are there people going faster than the calculators?

Yes, based on this equation my car calculates out to 1.4360 for my best pass ever (10.55), but a 1.43 60' for me is slow. I am usually 1.42 or 1.41, even when running slightly slower 10.60s or 10.70s. I would blame that on having a 4.56 rear gear ratio and a TH350. If it was a powerglide and/or <3.90 gears, I am sure the 60' would suffer a bit. This calculation can't be 100% accurate for everyone because there are just too many variables, but it will let you know if you are in the ballpark on a N/A combo.

Greg
 
#28 ·
Yes it can mine does the mph is low for the 60' Because of choices made and hook, hitting it harder up front, and 330ing is better I think on N/A cars and in my case. To much is made of 60'