Mayberry40

This is the results from my first time in the quarter mile.....
60 ft. 2.345
330 ft. 6.31
1/8 9.569 at 75.05
1000 ft 12.393
1/4 14.799
94.59
My 08 GT/CS is stock with 3.55 gears.
What should I adjust to get the time lower?
Thanx for any information.

awakeinAZ

I think CS is 3.31 unless you have a manual and got something different.

Mayberry40

Its a 5 speed....3.55.

DANNY

Get a tune and a cold air!! I run 13.9 stock and 13.3 with a 91 tune from super chips and a K&N cold air.It was my 07 gt/cs auto with 3:31,i have not taken my 08 gt/cs out yet.

Antigini-GT/CS

It also depends on your environment, don't forget. I'm at 4,000ft elevation with HOT HOT HOT dry air, and in result i'm having the hardest of times breaking 14's with my Flowmaster A/T's. Rule of thumb around here is +1 E/T second due to the environment.

theredliner

Stock 5 speed wil run 13.9 to 15 seconds. The GT has always run this way completly stock. My 1991 gt 5 peed did as well as my 1995 gt 5 speed. My 2007 5 speed hit 14 flat twice 14.5 once. IMO The weight and stock engine have a lot to do with it. The real question here is: How fast do you want to go? Lets start with cold air tune and K&N kit headers, exhaust and maybe a set up smaller tires /wheels with street slicks. To get even more aggresive consider heads and aluminum driveshaft. Also this car needs to loose some weight. Take the spare, floor mats trunk mat out and consider replacing hood and trunk lid with lighter fiberglass body parts. Or you may want to consider a power adder and the smalller wheels/slicks. A supercharger, 80hp -150 shot nitrous should get us to 13 flat or even high 12's if you get it tuned right. All of the above I have tried with my older mustangs and have had success. My 91 GT did 11.5 ET consistently with a supercharger, heads, full exhaust and 8 point cage, did I menton it was a convrtile as well? Good luck.

Antigini-GT/CS

I just purchased some M/T ET Streets. I'll let you know how the times go. 14's here I come.

Five Oh Brian

Your 2.3 60' time tells me you aren't launching hard enough and/or have traction problems, so getting that under control with sticky tires should net you 1.8's, which would improve your 1/4 mile ET by about .7 (14.0's or 14.1's).

However, and more telling, is that your 94 mph trap speed indicates you raced in miserable weather: too hot, too humid, falling barometer, etc. If you know the weather specifics for a specific day/hour you were racing, you can convert your performance to sea level and good weather - corrected by Density Altitude - at the following website...

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

Ideally, you want cool temperatures and high pressure on the barometer (cold, dense air creates more power). Your car should easily top 100 mph in the 1/4 mile 100% stock, and likely hit 102-3 mph, regardless of bad traction that would result in slow ET's. A car that can go 102-3 in the 1/4 mph, with decent driving and traction, should run mid 13's in good weather at sea level.

69Mach1-409

Not picking on you here and please don't take it personally, but I'm going to have to say your launch needs improvement and you need to work on shifting faster. I've screwed up the launch, got a 2.201 60' (before most of my mods), and still managed at 13.6 @ 102mph.

Five Oh Brian

Bad launch or sloppy shifting still wouldn't explain a 94 mph trap speed. The low trap speed is the result of high altitude and/or crud weather which results in thinner air, which in turn produces less power.

A car that runs 94-95 mph trap speeds should run 14.20's or 14.30's with a good driver and traction, so Mayberry 40 could certainly practice and improve some there, but the bulk of the problem is power related - not driver/traction related, IMO, and goes back to altitude and weather.

I'm not the best racer out there, but I have been racing at the same track for 26 years and have won enough money and trophies to know I have above average skills. Last season, my '07 GT automatic was still naturally aspirated (but had the other mods in my signature). Our track is just 250' above sea level. On cool days with high barometric pressure, I could run 13.10's @ 104 mph consistently. On muggy, summer days when the Denisty Altitude would shoot up to around 3,000 feet equivalent above sea level, my car would slow way down to 13.60's @ 99-100 mph. That's a 1/2 second and 4-5 mph difference just due to weather, and some tracks net Density Altitude figures much worse in the summertime than we see here in Seattle.

Knowing the weather (and correlating density altitude) helps me predict how fast (or slow) my car should run at a particular event so I can dial in more accurately for bracket racing. Most people who don't race often just know that on hot days they run slower, but don't give it a lot of thought. Being able to measure and adjust for the weather is key to bringing home money from the track.

So, in Mayberry40's case, let's just say for example, that he was racing in incredibly bad air which yielded the equivalent of 4,000 ft above sea level on the day he ran 14.79 @ 94.59 mph . And let's assume that his local track is really only 1,000 ft above sea level. That would be the equivalent of running 14.27 @ 98.19 at his track with favorable weather, or 14.07 @ 99.52 at sea level with favorable weather. Of course, he did race in the middle of summer, so the air was likely even worse than I'm assuming in the example, but hopefully my point makes sense.<SCRIPT type=text/javascript> vbmenu_register("postmenu_5609402", true); </SCRIPT>

Mayberry40

The temperature was app. 87, sunny, and humid. I dont know the altitude in the Columbus area.
Thanx for all comments.

Antigini-GT/CS

Well, let me give you a good idea about my situation. 4,000ft elevation, in high 80's/low 90's, no humidity, thin air AND a new track(i'm talking months) with very little rubber on it, even at the staging lanes have so far allowed me a best of 15.11 with no less than a 2.35 60's, although I usually stay around 2.39's. MPH was 93 I believe. The ONLY thing I can at least be somewhat thankful for is i'm not the only person having these problems. I know how to launch, i've figured out the range to stay in so that yes, I will spin the crap out of my tires because there's nothing to hook on to(this isn't a NHRA-style track so there's little prep done, and nothing after the 60), but be able to make it down the track decently. I don't powershift, either. Hopefully come September when the weather cools down i'll be a few tenths lower, but i'm not hoping for anything big.

Five Oh Brian

The only dragstrip I could find listed in Columbus, Ohio is National Trail Raceway, which is 900' above sea level. Other tracks in Ohio seem to be around 900-1100' above sea level, which yields ET's and trap speeds roughly 1% worse than sea level.

That said, I plugged your 14.79 @ 94.59 into a density altitude computer to do NHRA corrections for your car's performance (corrected to sea level and fair weather). The corrected number assuming 87 degrees, 85% humidity (you said it was humid), 30.00" barometric pressue (an average #), and 900' above sea level would be 14.22 @ 98.3 mph. This is only an approximation as I don't have hard/firm #'s for your weather that day, but they should be relatively close. Learn to launch harder to better your 60' times, and you'd by clickin' off high 13's @ 100 mph, or better, at a track near sea level with fair weather.

Five Oh Brian

I did the same NHRA correction based on density altitude for your 15.11 @ 93 mph run. Assuming 4,000' above sea level, 90 degrees, 10% humidty (virtually no humidity), and high barometric pressure (31.00) for a hot/dry day, and your run corrects to a 13.95 @ 100.12 mph. Get some sticky tires to hook up and post some sub 2.0 60' times, and that 13.95 @ 100.12 would be 13.50's or 13.60's at 100 mph (corrected for sea level and fair weather). So in your case, your launching needs a little finesse, your traction is bad, and your track altitude is killing your times. Get some drag radials and move to the coast!

Knight

You definatly need practice. Thats a really low trap. Are you pressing the gas all the way down? hopefully you are not shifting to 4th cause you should be crossing the line in 3rd with that speed and gearing.

Antigini-GT/CS

4th is a dream for me on the track. I just got some sticky tires so those times WILL change. That track is slippery as hell. I'll have to relearn launch style with them anyway, so there's always room for improvement. Give me a few weeks to report back since I won't be hitting the track this weekend.

grampa_stang

I'd say your times are a little slow for your altitude. Maybe the weather was even worse than previously calculated. To give you an idea...

I'm at 5000' in Salt Lake City, Utah. According to tracks website, the NHRA correction factor is 7000-11000. Not sure why, but that what it says. Anyways, I have an '07 GT auto w/3.31.
stock I ran 1 15.1 @92 mph
CAI/tune 14.6 @ 96.94 (tune shifts at 5900 rpms) NHRA corrected for 5000' 13.6 @103 / 7000' 13.3 @106
CAI/tune 14.3 @ 98.57 (tune modified to shift at 6200) NHRA 5000' 13.4 @105 / 7000' 13.0 @107
3.73's in 2 weeks.

I can tell you this for sure...altitude kills!!. I drove to California (Bay Area) in May and yeah.. HUGE difference. Car was friggin awesome! Seriously makes me want to move back.

dac64

When you guys drag...you never hit 5th gear? Your passing the finish line in 3rd or 4th?

69Mach1-409

I'm just hitting redline in 3rd when I trip the lights.

dac64

Do you shift each gear (1st, 2nd and 3rd) just before the redline? Is that your shift points?