Help me analyze some 1/4 mile times guys!

[uhoh5.0]

Went to test and tune last night and really didn't run too well. It was a big night for the pro-mod cars, and one of the lanes was really well prepped and the other lane was *****! My first two runs were horrible, so I just watched for about an hour and they did some work on the crappy lane and then I ran the following two times back to back, I could never get a run in on the good lane:

R/T:0.146
60':2.225
330:6.215
1/8:9.427
1/4:14.538
MPH:96.19

R/T:0.241
60':2.057
330:6.028
1/8:9.238
1/4:14.484
MPH:95.57

Take a look at my mods and tell me what you think, this is an automatic. I am getting a converter built and installed next week which I think will help tremendously, but I also think drag radials will be a must. It's just frustrating, I thought that with the mods I have I should at least be in the high 13s

 

[02bluegtstang]

yes I would expect at least high 13s...I got a 14.2 and my car is pretty much stock...but mine is a 5spd :\

 

[Dragstr05]

Maybe that auto does suck up alot. I'm just dipping into the 13 on BFG KDW's, with just a K&N drop in, o/r H and catback. Trapping 99mph. Looks to me like traction *may* have been an issue in the beginning, but 2.0 60ft on street radials isnt terrible. Just need to get that thing running faster down the entire track. While your mods list is far more extensive than mine, none of your mods really add any significant power, and the auto will suck up quite a bit.

 

[Dragstr05]

Maybe that auto does suck up alot. I'm just dipping into the 13 on BFG KDW's, with just a K&N drop in, o/r H and catback. Trapping 99mph. Looks to me like traction *may* have been an issue in the beginning, but 2.0 60ft on street radials isnt terrible. Just need to get that thing running faster down the entire track. While your mods list is far more extensive than mine, none of your mods really add any significant power, and the auto will suck up quite a bit.

 

[Mike97gt]

We need the weather and altitude data to figure this out. "it was hot" or "it was cool" does not cut it..

go to this website www.weatherunderground.com and get the zipcode for the town your track is in, then use the archives to find the weather data for that day.. We need this info

1. temp

2. baro pressure

3. humidity

4. altitude of the track itself ( this info can be found on the tracks website)or if not post the tracks name and me or another member can find it out for you..

Without correcting the numbers for weather/altitude you or anybody else for that matter have no clue as to how well or how poor you did, depending on how extreme the conditions it can swing the times and trap speed a LOT

 

[BurningRubber]

Hahaha dude, do you remember cruising back with a white GT with black stripes on the hood and a few other Stangs?!?!?!

Thaaaaat was me for like the last 45 mins in the white GT... kinda funny. Very nice car man, you had a few people from our group (GSMC) comment on it.

As for the times though, dont feel bad. I think you talked to one of our buds JW (vert just like yours) and he was getting the best times of all of us except the guy with the Terminator. He has a LM-1 catback, 3.73's, Diablo tune and possibly another bolt on or two and could only get a best of 14.06 through a 5 speed, driving the hell out of that thing on a few runs.

It was incredibly humid, fog was rolling in... wasnt a great time to race. Another buddy of mine in the silver GT could only get a 14.6 when he was used to running 14 flats, so dont feel too bad.

Come check out the group if your interested, always looking for new members.

 

[BlackenedSVT]

barring any sea-level corrections at the track....I dont see how you're running a 14.4. My time in my sig is with those mods in my sig and it looks like you and i basically ahve the same mods. And as you can see my car is capable of high 13s no problem, so i'm surprised to see your car (the automatic) not putting those times down.....

 

[BurningRubber]

barring any sea-level corrections at the track....I dont see how you're running a 14.4. My time in my sig is with those mods in my sig and it looks like you and i basically ahve the same mods. And as you can see my car is capable of high 13s no problem, so i'm surprised to see your car (the automatic) not putting those times down.....

The track is pretty much sealevel, but the conditions sucked. It was 70*, but enough humidity and a high enough dew point to make you sweat.

 

[Mike97gt]

The track is pretty much sealevel, but the conditions sucked. It was 70*, but enough humidity and a high enough dew point to make you sweat.

baro presure has a bigger impact on the times and trap speed than the temp humdity... the difference between 28.9 and 30.0 baro might seem small but that can make a .2 or so impact on your times.

I don't get to go to the track often but the first thing I do a few hours before i leave for the track is check the conditions.. If I see a low baro I don't bother going now.

One time I did not check the baro because it felt great out low 70's with very low humidity and I was wondering why I was a tenth off and 1 MPH lower than my normal runs. it turns out the baro was the cause after I ran the data it turned out the low baro was costing me .2 and 1.5 mph trap speed. needless to say I was pissed what a waste of money driving 40 miles each way to the track and spending 18 bucks to get in.. It was kind of funny I was messing with my tuner tring to figure out where that 1 mph went, I was really really pissed at myself I started changing shift points later in the night and that made it worse.

 

[DTMach1]

you don't seem to be really consistent on the big end...maybe the DA changed drastically, but it looks like you did something different on the big end on the 2nd run that actually hurt you.

Edit: its hard to analyze your time slips because they are so different

 

[BurningRubber]

Here you go svttech...

http://www.weatherunderground.com/h...tml?req_city=NA&req_state=NA&req_statename=NA

 

[Mike97gt]

the DA number that night was a bad 1426 ft so it was like running at a elevation of 1426 ft even with the track itself being 131 ft


Temp: 73.4°
Humidity: 86%
Track Altitude: 131 feet
Pressure: 29.90 in.

Density Altitude = 1426 feet ET MPH
Uncorrected 14.53 @ 96.19
Corrected 14.31 @ 97.68

--------------------------------------------------------------------------

Based on:
Temp: 69.8°
Humidity: 100%
Track Altitude: 131 feet
Pressure: 29.90 in.

Density Altitude = 1206 feet ET MPH
Uncorrected 14.48 @ 95.57
Corrected 14.29 @ 96.81
------------------------------------------------------------------------


Since I don't know what time the runs were run at I had to take a guess since most track run in the evening hours I used the weather data from 6:35 PM and 9:00 PM... If you get me time of day you ran each run I can narrow this down a little better...

From what I see here it seems your car was somewhat heat soaked in the second run, from what I have noticed these cars need a LONG cool down period shut off with the hood up and ICE packs help between runs. I have not done the ice packs myself because I am lazy but I have noticed when I go to the track that my car slows down after a few runs unless I let it sit for over a hour. If you were making the same amount of power you were making in the first run I think with the better 60 ft you would have gotten maybe a corrected 14.1 or so.

Well anyways with me having to guess the time of day you ran I can not be 100 percent sure of this but I bet it's close and considering your mods and the fact that your car is a vert I think your right around where you should be considering the poor conditions.

Well anyways if you get me the exact times of the runs or atleast close I can make a better attempt to figure this out.

 

[DTMach1]

the DA number that night was a bad 1426 ft so it was like running at a elevation of 1426 ft even with the track itself being 131 ft


Temp: 73.4°
Humidity: 86%
Track Altitude: 131 feet
Pressure: 29.90 in.

Density Altitude = 1426 feet ET MPH
Uncorrected 14.53 @ 96.19
Corrected 14.31 @ 97.68

--------------------------------------------------------------------------

Based on:
Temp: 69.8°
Humidity: 100%
Track Altitude: 131 feet
Pressure: 29.90 in.

Density Altitude = 1206 feet ET MPH
Uncorrected 14.48 @ 95.57
Corrected 14.29 @ 96.81
------------------------------------------------------------------------


Since I don't know what time the runs were run at I had to take a guess since most track run in the evening hours I used the weather data from 6:35 PM and 9:00 PM... If you get me time of day you ran each run I can narrow this down a little better...

From what I see here it seems your car was somewhat heat soaked in the second run, from what I have noticed these cars need a LONG cool down period shut off with the hood up and ICE packs help between runs. I have not done the ice packs myself because I am lazy but I have noticed when I go to the track that my car slows down after a few runs unless I let it sit for over a hour. If you were making the same amount of power you were making in the first run I think with the better 60 ft you would have gotten maybe a corrected 14.1 or so.

Well anyways with me having to guess the time of day you ran I can not be 100 percent sure of this but I bet it's close and considering your mods and the fact that your car is a vert I think your right around where you should be considering the poor conditions.

Well anyways if you get me the exact times of the runs or atleast close I can make a better attempt to figure this out.

Look at his 60ft, 1/8th, and 1/4 times...on his second slip he should've been somewhere around 14.3xx but you can't really base anything off that since he lost about 1/2mph, he was consistently .2xx better but didn't ET and dropped a little MPH. It'd be nice to see the 1/8th MPH for the two runs I think he's either manually shifting it, or let off the loud pedal a little to soon.

LIke I said earlier, its really difficult to figure out your time slips because they are so different. There's no consistency.

1400ft DA is NOT bad at all, he may have run a couple tenths quicker at a lower DA, but remember, the scoreboard doesn't light up a "corrected" time!!!

 

[uhoh5.0]

Thanks for all of the info guys, the 1/8 mph wasn't printing correctly on the time slip so I really don't know the mph at that point. As for the times of those two runs, they were back to back 8:45pm and 9:03pm. I was letting the car shift itself at 5750 (1-2 shift), and 5600 (2-3 shift) and crossing the finish line in 3rd at about 5000 rpms. With my stock converter, the tires start to break loose at 1800rpms and my converter will only stall at about 2400rpms so that is all I can launch at. I really appreciate the info, and thats pretty cool that some of the guys from my area are here on the board too. I remember the white mustang and the other guy with the vert like mine and the two new mustangs (red & blue). I took my wife with me too the track also, and she is almost ready to pop (due in december) so I really have to drive kinda slow with her in the car or I get an ear full! Hope I didn't slow anyone down on the way home Anyhow, off to work and I will post tonight with my upcoming mods, etc. and let you guys provide feedback. Thanks, and nice meeting everyone.
Sean

 

[Mike97gt]

Look at his 60ft, 1/8th, and 1/4 times...on his second slip he should've been somewhere around 14.3xx but you can't really base anything off that since he lost about 1/2mph, he was consistently .2xx better but didn't ET and dropped a little MPH. It'd be nice to see the 1/8th MPH for the two runs I think he's either manually shifting it, or let off the loud pedal a little to soon.

LIke I said earlier, its really difficult to figure out your time slips because they are so different. There's no consistency.

1400ft DA is NOT bad at all, he may have run a couple tenths quicker at a lower DA, but remember, the scoreboard doesn't light up a "corrected" time!!!

I know scoreboards don't light up corrected times but the only way you can comapre runs from a different area then the one you live in is to correct the data and compare it to corrected data from cars in your area. My rule of thumb is post uncorrected times on the internet and use uncorrect time to say how fast or slow your car is, but use corrected times to figure out what you need to do to improve. correcting the data removes some of the variables. Without correcting it the times are useless.

If he had a larger sample of slips, atleast 5-6 this would be easier. As far as the DA is concerned, I try to only go to the track when I think the DA will be under 1,000

 

[BooWFO]

If your really wanting to maximize everything I suggest writing all data on the timeslip you can and either keep a log book or file. I input all my runs into a spreadsheet so I can see what is helping and what isn't.
BTW I think the 60's your getting on street tires are great.

 

[TweekedGT]

I know scoreboards don't light up corrected times but the only way you can comapre runs from a different area then the one you live in is to correct the data and compare it to corrected data from cars in your area. My rule of thumb is post uncorrected times on the internet and use uncorrect time to say how fast or slow your car is, but use corrected times to figure out what you need to do to improve. correcting the data removes some of the variables. Without correcting it the times are useless.

If he had a larger sample of slips, atleast 5-6 this would be easier. As far as the DA is concerned, I try to only go to the track when I think the DA will be under 1,000

I agree. Post what you actually ran not corrected numbers. The car will never ever run a corrected timeslip becuase those are perfect conditions but at least you can compare apples to apples. Look at the figures in my sig. My car looks slow being blown and only running 12.56 but when you see the rest of the slip with the elevation and put it into a corrected time calculator it helps to compare to others. It's a low 11 pass at a sea level track in perfect conditions, I'm happy with that.

 

[DTMach1]

If your really wanting to maximize everything I suggest writing all data on the timeslip you can and either keep a log book or file. I input all my runs into a spreadsheet so I can see what is helping and what isn't.
BTW I think the 60's your getting on street tires are great.

Very True!!! Keeping a log book is the best way to analyze and make adjustments!

 

[Mike97gt]

I agree. Post what you actually ran not corrected numbers. The car will never ever run a corrected timeslip becuase those are perfect conditions but at least you can compare apples to apples. Look at the figures in my sig. My car looks slow being blown and only running 12.56 but when you see the rest of the slip with the elevation and put it into a corrected time calculator it helps to compare to others. It's a low 11 pass at a sea level track in perfect conditions, I'm happy with that.

Funny thing is I live at sea level I have had a couple of times where I had a negitive DA and had to add time to my timeslip.. one time I had a DA of over -100.. LOL it's sucks when you have to ADD a couple of tenths to your timeslip

 

[Jackie Chan]

ditch that c&l ****, sell the frpp stuff and put the stock airbox and inlet tube back on. use the money to buy the accufab plenum and tb. get some weight out of the car and put some lighter wheels and tires on there. should have went 4.30s anyway. put the converter in and get a better tune. low 13's easily.