Track MPH

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BluThnder99

New Member

Aug 29, 2003

201

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0

St. Louis

Aug 31, 2004

#1

• Aug 31, 2004

• #1

I don't understand how cars can run a 14.4 at 99-98 mph and everytime I run a 14.4 my mph is like 95-96mph how does this happen. I have a auto but I don't get it how a 14.4 time can very so much with the MPH. Please explain

 

Go HoTO!

New Member

Apr 11, 2004

602

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Mountaintop, PA

Aug 31, 2004

#2

• Aug 31, 2004

• #2

This is a GREAT question. Trap speed depends opn many factors, not the least of which is climate and altitude.

If you get more tire spin on launch, your trap will be at a higher rpm and thus speed all other things being equal.

I saw a Z-28 run a 14.4 last week and trap at 112 mph. That was really wierd, but the guy was most likely spinning through second gear.

Also, remember it is a race. Trap speeds should be used for trouble shooting. The winner is the guy who gets the the 1/4 mile the soonest, not the guy with the highest speed.

When you launch, you want a little spin, but not too much. Spinning is better than bogging.

What is your 60 foot times? If your are getting 2.4 as an example, and you get a better launch with a little spin and your 60 foot drops to 2.0-2.1, I would expect something like a 13.9 at 99 mph. I mention this only as an example so you can see some realistic numbers.

Most likely, you are bogging your launch a bit.

 

crew_dawg16

New Member

Apr 25, 2004

445

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DeKalb, IL

Aug 31, 2004

#3

• Aug 31, 2004

• #3

weather can have a lot to do with it. Most of the time when you see high MPH but a slow time, traction is to blame. They can't launch is what it comes down to.

 

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BluThnder99

New Member

Aug 29, 2003

201

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St. Louis

Aug 31, 2004

#4

• Aug 31, 2004

• #4

My 60' times are consistantly 2.1's and 2.2's but I do get a little tire spin. without that tire spin what numbers do think I would put for 60' and 1/4 times. See my goal is to brake into the 13's with stock rearended auto on street tires. But I was just wondering about the MPH cause I always see guys posting there times and it'll be a 14.4 or something like that at a faster mph than me and I'm like what the hell.

 

crew_dawg16

New Member

Apr 25, 2004

445

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0

DeKalb, IL

Aug 31, 2004

#5

• Aug 31, 2004

• #5

look for example at my times. Our MPH are comparable, but 3600 ft. elevation and nasty tire spin have me slower than you. I cut 2.3 60fts at best. Just because a car is fast, doesn't mean it's quick.

 

Go HoTO!

New Member

Apr 11, 2004

602

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Mountaintop, PA

Aug 31, 2004

#6

• Aug 31, 2004

• #6

You 60 foot's are pretty good for a stock auto. If you say you are getting some spin, I believe ya. If you did not get ANY spin, your 60 foot times would probably get a little worse and then loose a little trap speed. This would put you in the wrong direction.

Are you taking your passenger head light out? This creates a ram air effect and will get you 1 - 2 mph. Most guys do this on their stangs and has been pretty much accepted as gospel.

Your 60 foot goal with a near stock car, on stock tires should be about 2.0.

Aslo, what is the altitude of the track? Have you corrected your times for altitude and barametric pressure and humidity. This might tell us a lot.

Every 1,000 feet in altitude will cost you about 0.50 seconds in the quarter and about a 1.5 mph loss in trap speed with a near-stock stang.

So, be careful comparing your times to guys on the net w/o looking at where they live. Also, some guys cheat and list their corrected times. This is fine, as long as it is stated.

 

BullittStangV8

Founding Member

Oct 5, 2002

1,104

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36

NJ

Aug 31, 2004

#7

• Aug 31, 2004

• #7

My personal best e.t is 14.0 @ at 100 mph. Im trapping a higher mph then people who have had lower e.t's. I should be trapping a higher mph, and a lower et, however the humidity was high (98%), and the temperature was in the high 70's. These are horrible conditions for drag racing. My best 60 was a 2.1 on street tires, so my e.t was more a result of the lower hp caused by the air, rather then my launching. With better air, and lower humidity, i should be in the higher/mid13's. All of this was before the 4.10's. Therefor, dont be disapointed with your mph, rather, work on your e.ts's. mph is greatly affected by the settings of the race. Ideal racing temp and humidity, as well as alt., will most definitly have a noticable effect on your mph, as well as your e.t.
What was the temp, humidity, and alt when you raced? that might help us tell if your mph is actually low, or if its just a product of the track.
Mike

 

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BluThnder99

New Member

Aug 29, 2003

201

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St. Louis

Sep 1, 2004

#8

• Sep 1, 2004

• #8

I don't know what altitude I am at but I can tell you I live in St. louis if that helps. The day I ran my 14.4 @ 95 it was a pretty cool day with low humidty. Go Ho To why would my 60' times get worse with less tire spin? thought the name of the game was traction you know better traction better times? I'm confused. How would I go about correcting my times, is there a website I can go to?

 

DTMach1

New Member

Jun 14, 2004

240

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0

Virginia Beach, VA

Sep 1, 2004

#9

• Sep 1, 2004

• #9

spinning can be a factor as stated before...I've spun first through the 60ft and when I finally got traction I trapped at 14.4 @ 104mph...If I hadn't spun like that, it would've been an mid 13 second pass that time...

 

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BVille99GT

Member

May 1, 2003

283

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16

Brownsville TX.

Sep 1, 2004

#10

• Sep 1, 2004

• #10

I'm trying to get into anyones nerves, but I seen CRX run on the track 12.4@100MPH honest to god.

 

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billyfe390

New Member

Aug 18, 2003

573

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0

Sep 1, 2004

#11

• Sep 1, 2004

• #11

BluThnder99 said:

I don't know what altitude I am at but I can tell you I live in St. louis if that helps. The day I ran my 14.4 @ 95 it was a pretty cool day with low humidty. Go Ho To why would my 60' times get worse with less tire spin? thought the name of the game was traction you know better traction better times? I'm confused. How would I go about correcting my times, is there a website I can go to?

Click to expand...

http://www.modulardepot.com/density.php

 

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98svtconvert

New Member

May 26, 2004

85

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va beach, va

Sep 1, 2004

#12

• Sep 1, 2004

• #12

i have a little tire spin and i am getting consistant 2.0-2.1 60' times. what tire pressure are you running at. i dropped mine to 30psi all around and it helped me off the line a bunch.

 

BullittStangV8

Founding Member

Oct 5, 2002

1,104

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36

NJ

Sep 1, 2004

#13

• Sep 1, 2004

• #13

How accurate is that site for correcting et's? Do most people correct theirs (meaning in their sigs/when talking about their times)? or just leave them as what you got at the track that day?
Mike

 

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billyfe390

New Member

Aug 18, 2003

573

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0

Sep 1, 2004

#14

• Sep 1, 2004

• #14

BullittStangV8 said:

How accurate is that site for correcting et's? Do most people correct theirs (meaning in their sigs/when talking about their times)? or just leave them as what you got at the track that day?
Mike

Click to expand...

The site I posted is very accurate. I think most people just put down what they actually ran. Most people that go for TnT or street legal drags dont keep track of the DA.

 

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tjm73

Founding Member

Aug 3, 2000

2,418

2

48

Rush, NY

Sep 1, 2004

#15

• Sep 1, 2004

• #15

Track mph is an indication of how much power you have available on a given run.

Track time is an indication of how efficently you put that power to use on that given run.

So if you have one car that runs a 13.80 at 99 mph and another car that runs a 14.00 at 99 mph, we can analyze the numbers and see that the slower car (mr. 14.00) would have slower 60' or 330' or 1/8 mile numbers or what have you. SOmethign in his run let him only go 14.00 while the other guy did somethgin better and that let him run 13.80. Could be better traction, better shifting, or any of a lot of other factors.