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Old 02-22-2011, 10:47 PM   #26
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I guess I don't fully understand what density altitude really is. I just assume the lower the better?
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Old 02-23-2011, 06:15 AM   #27
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Density altitude is the altitude in the International Standard Atmosphere at which the air density would be equal to the actual air density at the place of observation, or, in other words, the height when measured in terms of the density of the air rather than the distance from the ground. "Density Altitude" is the pressure altitude adjusted for non-standard temperature.
Both an increase in temperature and, to a much lesser degree, humidity will cause an increase in density altitude. Thus, in hot and humid conditions, the density altitude at a particular location may be significantly higher than the true altitude.



For drag racing this is the equalizer to compare times and speeds when racing under different conditions. Not the most accurate way to compare (it is all we have, short of racing heads up) but gives you some idea of where you may stand compared to others located in other regions of the world.
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Old 02-23-2011, 09:02 AM   #28
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yeah, i know how to search google. lol and i did. it's still pretty foriegn to me!
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Old 02-23-2011, 09:19 AM   #29
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Just depends on how high you are in elevation, so yeah Vegas is up there in elevation. Then add in the air temp, humidity, and barometric pressure and you get the DA. Best DA's are cold weather, low elevation, and even barometric pressure.
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Old 02-23-2011, 09:24 AM   #30
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yeah, i know how to search google. lol and i did. it's still pretty foriegn to me!

Think of it this way. Air is denser at lower altitudes or cooler temperatures. Denser air contains more O2 per volume and allows you to burn more fuel (= more power). Higher pressure is basically the same thing (more O2 = more power). Other things like humidity have an affect on how fuel ignites. The DA is a formula that trys to adjust your ET/Trap to what it would be if you ran at standard temperature and pressure.

Hope that helps.
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Old 02-23-2011, 09:30 AM   #31
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Just depends on how high you are in elevation, so yeah Vegas is up there in elevation. Then add in the air temp, humidity, and barometric pressure and you get the DA. Best DA's are cold weather, low elevation, and even barometric pressure.
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Think of it this way. Air is denser at lower altitudes or cooler temperatures. Denser air contains more O2 per volume and allows you to burn more fuel (= more power). Higher pressure is basically the same thing (more O2 = more power). Other things like humidity have an affect on how fuel ignites. The DA is a formula that trys to adjust your ET/Trap to what it would be if you ran at standard temperature and pressure.

Hope that helps.

Thanks guys.
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Old 02-23-2011, 09:34 AM   #32
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Think of it this way. Air is denser at lower altitudes or cooler temperatures. Denser air contains more O2 per volume and allows you to burn more fuel (= more power). Higher pressure is basically the same thing (more O2 = more power). Other things like humidity have an affect on how fuel ignites. The DA is a formula that trys to adjust your ET/Trap to what it would be if you ran at standard temperature and pressure.

Hope that helps.
Awesome, thanks!

So everything else being equal, a DA of -xxx is better than a DA of 0?
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Old 02-23-2011, 11:41 AM   #33
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Yes. The lower the number the better. Sorry about the Yahoo response for the technical answer. I thought that is what you were looking for. There is a website that does all this for you.

http://www.dragtimes.com

You can find all the info for temp, elevation, etc. by finding the track and the day you ran.

Give it a try.
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Old 02-23-2011, 11:57 AM   #34
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Yes. The lower the number the better. Sorry about the Yahoo response for the technical answer. I thought that is what you were looking for. There is a website that does all this for you.

http://www.dragtimes.com

You can find all the info for temp, elevation, etc. by finding the track and the day you ran.

Give it a try.
yeah, i've used that already too. lol thanks. Track over here doesn't open until March 11th.:(
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Old 02-23-2011, 11:59 AM   #35
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yeah, i've used that already too. lol thanks. Track over here doesn't open until March 11th.:(
why so late. waiting for the temps to get back over 80 ?
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Old 02-23-2011, 12:04 PM   #36
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why so late. waiting for the temps to get back over 80 ?
i wish i knew. i believe last year they opened up in late january. it really makes no sense.
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Old 02-23-2011, 12:07 PM   #37
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i can't wait for c5fest. Hopefully see better "uncorrected" times. lol
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Old 02-23-2011, 12:41 PM   #38
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With just radials and a good driver bone stock the M6 should see high 13s.
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Old 02-23-2011, 01:09 PM   #39
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With just radials and a good driver bone stock the M6 should see high 13s.
You sure about that. Since the best posted bone stock V6 on this forum is running 14.4XX's
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Old 02-23-2011, 01:34 PM   #40
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With just radials and a good driver bone stock the M6 should see high 13s.
With a perfect sticky launch due to the radials and decent DA I could see maybe a high 13 happening, but sadly we haven't gotten to see a stock M6 get close to that yet.
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Old 02-23-2011, 08:25 PM   #41
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You sure about that. Since the best posted bone stock V6 on this forum is running 14.4XX's
Havent even the mags gotten 14.2s? Low low 14s stock are possible.

Radials can dramatically improve 1/4 times, every tenth off your 60 foot is almost 2 tenths in the quarter. When I went with my 6 for the first time I couldnt hook at all. The pirellis seem to be more of a racing/road course tire more than a drag tire.

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With a perfect sticky launch due to the radials and decent DA I could see maybe a high 13 happening, but sadly we haven't gotten to see a stock M6 get close to that yet.
Wait til spring If Ive calculated correctly I should be able to break some records or at least raise some eye brows with the small amount of mods I am going to have on the car.
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Old 02-23-2011, 09:40 PM   #42
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Havent even the mags gotten 14.2s? Low low 14s stock are possible.

Radials can dramatically improve 1/4 times, every tenth off your 60 foot is almost 2 tenths in the quarter. When I went with my 6 for the first time I couldnt hook at all. The pirellis seem to be more of a racing/road course tire more than a drag tire.



Wait til spring If Ive calculated correctly I should be able to break some records or at least raise some eye brows with the small amount of mods I am going to have on the car.
AWESOME. What mods do you have? What tires are you going to run? Come on let us in on it?
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Old 02-23-2011, 09:42 PM   #43
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Radials can dramatically improve 1/4 times, every tenth off your 60 foot is almost 2 tenths in the quarter. When I went with my 6 for the first time I couldnt hook at all.
Not sure about that. HDRS did a 1.961 60' on the stock Pirelli's all motor. He used my Nitto DRs and went 1.940. Same day I did a 1.980 on GoodYear Street tires.

Our ET was 3k of a second apart on our best run that day.
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Old 02-23-2011, 10:39 PM   #44
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Not sure about that. HDRS did a 1.961 60' on the stock Pirelli's all motor. He used my Nitto DRs and went 1.940. Same day I did a 1.980 on GoodYear Street tires.

Our ET was 3k of a second apart on our best run that day.
Yeah, sometime you trade spin for bog. It can be hard to get the right combo of tires and TM to get a good launch.


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Old 02-24-2011, 12:27 AM   #45
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AWESOME. What mods do you have? What tires are you going to run? Come on let us in on it?
Im going to run the stock 20s and a lighter 18 inch wheel set up once I find one that I like. With the 18s Ill mount radials

And mods are going on tomorrow, Im gonna post them after I get a dyno done in 2-3 weeks. Should be pretty interesting.

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Not sure about that. HDRS did a 1.961 60' on the stock Pirelli's all motor. He used my Nitto DRs and went 1.940. Same day I did a 1.980 on GoodYear Street tires.

Our ET was 3k of a second apart on our best run that day.
I should have added that it is possible with a good driver. my main problem is the weight of the 20s is a lot when we can fit 18s no problem.
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Old 02-24-2011, 12:31 AM   #46
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Im going to run the stock 20s and a lighter 18 inch wheel set up once I find one that I like. With the 18s Ill mount radials

And mods are going on tomorrow, Im gonna post them after I get a dyno done in 2-3 weeks. Should be pretty interesting.



I should have added that it is possible with a good driver. my main problem is the weight of the 20s is a lot when we can fit 18s no problem.
Sorry if I missed it, but do u have a base dyno?
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Old 02-24-2011, 12:45 AM   #47
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Sorry if I missed it, but do u have a base dyno?
Nope, but I will...kinda haha
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Old 02-24-2011, 07:06 AM   #48
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Im going to run the stock 20s and a lighter 18 inch wheel set up once I find one that I like. With the 18s Ill mount radials

And mods are going on tomorrow, Im gonna post them after I get a dyno done in 2-3 weeks. Should be pretty interesting.



I should have added that it is possible with a good driver. my main problem is the weight of the 20s is a lot when we can fit 18s no problem.
Please let us know what you decide on for the wheel tire combo, I have been researching this for a few months now, but I don't feel like investing close to a grand for the wheels and drag radials so that I can go 0.1 faster in the 1/4 mile twice a year on my daily driver. I have other mods I would put that money into. Going to the drag strip for me is just a fun time to do some legal racing. Not necessarily own any titles.

And as for the MODS.......... Watching and waiting with interest.
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Old 02-24-2011, 08:14 AM   #49
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Please let us know what you decide on for the wheel tire combo, I have been researching this for a few months now, but I don't feel like investing close to a grand for the wheels and drag radials so that I can go 0.1 faster in the 1/4 mile twice a year on my daily driver. I have other mods I would put that money into. Going to the drag strip for me is just a fun time to do some legal racing. Not necessarily own any titles.

And as for the MODS.......... Watching and waiting with interest.
What kind of rim/tire package are you finding for 1g? U also have to remember if you can get a lower overall diameter, it would be like getting better gears.
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Old 02-24-2011, 09:21 AM   #50
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Please let us know what you decide on for the wheel tire combo, I have been researching this for a few months now, but I don't feel like investing close to a grand for the wheels and drag radials so that I can go 0.1 faster in the 1/4 mile twice a year on my daily driver. I have other mods I would put that money into. Going to the drag strip for me is just a fun time to do some legal racing. Not necessarily own any titles.

And as for the MODS.......... Watching and waiting with interest.
At 21 man Im definitely on a budget so Im going for the cheapest combo I can LOL. My friend has a set of radials just sitting in his garage that he said I can use so I may take advantage of that.
If I can pull a sub 2.0' then Ill just run pirellis on the 18 inch set Im going to get. For now the 20s will have to do.

This is going to sound pretty crazy, but as of today Ill only have around $650 in performance parts and I plan to run a 13.6/13.7. I also went a bit high end in that $650, it could be done theoretically for about $300.

And yeah for me its just a hobby but I do take my hobbies seriously so if I can break some records in the process thats cool and if not I had run regardless. I need another set of rims anywhere for winter up here in NY so if I can get radials for cheap or something I might as well put them on the second set.
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