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Hi Officer, how ya doin'?
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Discussion Starter #1
Everybody put on their thinking caps. Let's say I ran a [email protected] (true story), but my 60ft. time was a miserable 2.29 seconds.
If I improve my 60ft. time just by 0.1 seconds, what does that equate to in the 1/4 mile ET?
Or think of it in this way. For every tenth I take off of my 60ft. time, what gains in the quarter mile should I expect. I've heard
for every tenth you gain, expect a .2 gain in
the quarter. But I've seen as much as a .3 - .4 second improvement. Are there any general rules of thumb?

Here's a sample of what I could do changing nothing else but my 60 ft. times.

60ft. 1/4mile ET

.2 gain .3 gain
2.29 12.81 12.81
2.19 12.61 12.51
2.09 12.41 12.21
1.99 12.21 11.91
1.89 12.01 11.61
1.79 11.81 11.31
 

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Premium Member
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1,619 Posts
<font face="Verdana, Arial" size="2">Originally posted by Big Boost:
I've heard
for every tenth you gain, expect a .2 gain in
the quarter. But I've seen as much as a .3 - .4 second improvement. Are there any general rules of thumb?
</font>
I've personally experienced .2 to .3 gain for every tenth gained on 60-foot time. I don't think there is a rule of thumb set in stone -- it just kinda varies depending on track conditions, driver conditions and car conditions.


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'93 Sentra SE-R, daily driver and track/autox toy
'91 Sentra SE-R, future racecar
 

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Veritas
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6,205 Posts
Rob;

It really depends on the car, to tell you the truth. As you know, turbo cars are all about top end. Just compare MPH numbers from a turbo car and a NA car running the same e.t.

The turbo car always has more mph.

Use my (nitrous) car as an example: I've cut a 1.98 60-ft time, yet only run 8.95 in the eighth mile. Your turbo car probably runs in the mid 8s in the 1/8 mile to get a 12.8x time slip. My nitrous comes on (usually) at the 40-60 ft mark, depending on the track. My 'slower' car is faster than yours, at least in 60-ft times. Your turbo does all its business at the top end.

That being said...you're basically launching your turbo car as a NA car, until boost comes up. By then, you're probably at or past the 60-ft lights. Most cars are.

So...to improve the 60-ft times on your turbo car, you need to approach it from a NA standpoint. What makes a NA car launch quicker is what will make yours launch quicker, IMHO. Playing with the revs....cams....slicks/tires and their 'stickiness' .... will all help.

To answer your original question: With a turbo car, the e.t. improvements *could* be even better than the NA rules of thumb you mentioned in your post of .2 to .3 improvement.

Of course, this is just my opinion and I'm probably wrong
 

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3,793 Posts
ya, a supra might have a 2.3 60 foot, but it could run a 11.xx b/c they have an assload of topend power, and also maybe a lower e/t, but could run it at 130+ mph.
 

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ya, a supra might have a 2.3 60 foot, but it could run a 11.xx b/c they have an assload of topend power, and also maybe a lower e/t, but could run it at 130+ mph.
 
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