I was at Union Grove, WI (Great Lakes Dragaway) last night. I believe the altitude there is about 700' above sea level. Temps were 60 when I got there and dropping throughout the night. No hot laps, and about an hour or so cool down in the stagging lanes between runs while other classes were being run. My car is stock with about 1200 on the odometer. Started racing with 10 gallons in the car. Mine has the all season tires on it. I have no idea what the barometric pressure was and if it was changing.

First run while there was still light out and was the best run. All passes were in sport mode.

Run 1: No air filter, forgot to turn off stability, launching at idle.
13.777 @ 101.83 - 2.07 60' (7:37pm)

Run 2: Air filter in, stability of, launching at 1300.
13.926 @ 101.32 - 2.29 60' (8:33pm)

Run 3: No air filter, stability off, lanching at idle. Heard the tires spin just a tad on this run.
13.80 @ 101.05 - 2.10 60' (9:13pm)

Run 4: No air filter, stability off, launching at idle. Tires spun, friend behind the wheel this time so I could spectate.
13.99 @ 100.87 - 2.09 60' (9:56pm)

How would you guys rate these times? Any possible causes for the slowdown in mph after every run? There was a slight cross wind that was picking up throughout the night, but not sure how much it affected me. I'm thinking the air quality started to more and we could see rain clouds coming in as the night progressed. There was even a little drizzle, but not enough to stop the racing.

Tomorrow morning I'm going to get a few dyno pulls to get my baseline before I start with the mods.

I would say that a 13.77 would please a lot of folks.

Go here, scroll down and choose the location closest to your race track. http://www.wunderground.com/cgi-bin/findweather/getForecast?query=Union+Grove%2C+WI+

Now, go here http://www.modulardepot.com/density.php and plug in the information needed, which is temp, humidity, track altitude, pressure, your e.t., and your mph. This will give you the corrected time.

Thanks for the links. I gotta remember to get that info on the day I go for better accuracy.

So I used the history feature on weather underground. It was 46*F, 29.8 pressure, and 71% humidity on my first run.
Corrected it is 13.73 @ 102

Even corrected, it's pretty close it seams.

Nice work! I'd be happy with a 13.7

Good runs!

So, is it beneficial to run without an air filter?

So, is it beneficial to run without an air filter?

NO, I have never seen any gains by doing that. His difference in time slips are geared by his 60'.

Based on my runs, I don't think it will matter that much. But since it only takes a minute to take it off, I said, what the hell, and took it off.

Talk about a thick non breathable filter! Plus all those different channels the air has to go through before it hits the intake. It's no wonder a good after market cold air intake works as well as it does on these cars.

His time slips were better without the filter and both 60' were better with out the filter. So, maybe it helped a little. I might get to run mine this Friday a couple of times. Just maybe.

Got my car on the dyno today.

67*F 29.15 barometer 26% humidity
308hp and 331tq

Car is box stock.

Can some of the weather guys here tell me about air quality? I know numbers, buy not how they translate into good or bad in terms of making power and fast passes.

Got my car on the dyno today.

67*F 29.15 barometer 26% humidity
308hp and 331tq

Car is box stock.

Can some of the weather guys here tell me about air quality? I know numbers, buy not how they translate into good or bad in terms of making power and fast passes.

Go here http://www.modulardepot.com/density.php and just fill in the blanks.

308 rwhp isn't bad at all.........my 05 A4 GTO (bone stock) was only 329 rwhp, so you are just 21 hp less than a 400 hp car.

Were you running premium or regular at the track and the dyno?

How soon after you arrived did they begin the dyno run?

ignitedgt, I was running regular at the track. When the fuel light came on, I threw in $20 of premium (93), so kinda a mix of both when I was on the dyno. I plan on putting premium from now on, as I'm gonna order up the cai/vms tune deal. I wanted to get a head start on using premium to make sure there is no more regular mixed in the tank.

vhato, They ran my car about 45 minutes after I got there.

The reason I ask is its hard to compare our cars dyno readings. Mine was run as I drove up to the dyno. Mine was hot.

Another is we have no 1:1 ratio. Most dyno testers will place a 6 speed in 4th or a 4 speed in 3rd and assume a 1:1 ratio. Since we are 1:15 in 4th (I think) that will show a higher than possible power output. Just wondering how your dyno tested and what settings he keyed in.

The reason I ask is its hard to compare our cars dyno readings. Mine was run as I drove up to the dyno. Mine was hot.

Another is we have no 1:1 ratio. Most dyno testers will place a 6 speed in 4th or a 4 speed in 3rd and assume a 1:1 ratio. Since we are 1:15 in 4th (I think) that will show a higher than possible power output. Just wondering how your dyno tested and what settings he keyed in.

This was explained recently. The dyno computer automatically adjusts, comparing engine rpm versus wheel speed. Don't need a 1:1. I asked the same question.

This was explained recently. The dyno computer automatically adjusts, comparing engine rpm versus wheel speed. Don't need a 1:1. I asked the same question.

Thats correct, dynojets dont read actual RWTQ, its calculated from the RWHP it reads. That said, I have seen 10 rwhp differences from dynoing in 3rd vs. 4th regardless, with the 3rd gear pull dynoing LESS.

Got my car on the dyno today.

67*F 29.15 barometer 26% humidity
308hp and 331tq

Car is box stock.

Can some of the weather guys here tell me about air quality? I know numbers, buy not how they translate into good or bad in terms of making power and fast passes.

THats some pretty horrid air quality, but those numbers seem to be either SAE or STD corrected, otherwise they would be below 300rwhp for sure.

Thanks for the links. I gotta remember to get that info on the day I go for better accuracy.

So I used the history feature on weather underground. It was 46*F, 29.8 pressure, and 71% humidity on my first run.
Corrected it is 13.73 @ 102

Even corrected, it's pretty close it seams.
you have to remember that correction is for sea level. most of the awesome runs you see online are at like -1000 below sea level DA or more.

13.7 is nothing to be ashamed of thats for sure! Just wait till you get a Vector Tune and possibly the Roto-Fab!

13.7 is excellent for an out-of-the-box car that weighs almost 4000 lbs. Pretty solid time.

--Mike

Actually , dynos measure rwtq , and horsepower is calculated from the torque reading .

Nice times! Really Awesome

His time slips were better without the filter and both 60' were better with out the filter. So, maybe it helped a little. I might get to run mine this Friday a couple of times. Just maybe.

No, the 60' time won't be affected by making more power as the car already has enough to spin the tires like crazy. The fact that his runs were quicker without the air filter are all a result of hooking up better on the launch. To see if the car is making more power you need to look at the MPH, and apparently it makes no difference.

THats some pretty horrid air quality, but those numbers seem to be either SAE or STD corrected, otherwise they would be below 300rwhp for sure.

How is that horrid air quality?? 67* and 26% humidity is really good, I'd love to have that kind of air all year round. It's more humid and warmer than that in the middle of winter here!

And dyno numbers SHOULD always be corrected, SAE is the going standard for comparison. You should see a "SAE" or "smoothing" correction factor somewhere on your sheet.

Oh, and excellent times! You seem to know how to launch the car pretty well. Either that or the track prep was just awesome.

How is that horrid air quality?? 67* and 26% humidity is really good, I'd love to have that kind of air all year round. It's more humid and warmer than that in the middle of winter here!

And dyno numbers SHOULD always be corrected, SAE is the going standard for comparison. You should see a "SAE" or "smoothing" correction factor somewhere on your sheet.

Oh, and excellent times! You seem to know how to launch the car pretty well. Either that or the track prep was just awesome.

The temp and humidity were real good, but the barometer was way low. Low pressure is your enemy and will affect power output a lot.

If you want horrid air, please come out to Phoenix AZ.:wink2:

Or El Paso, Texas

i saw you run i believe, teh Red G8 GT

Yup, mine is red. How did it look going down the track? I got a lot of complements that night. Liquid red is an attention grabber.

looked good, sounded good at WOT, still a bit quite. ahd we been lined up you would have beaten me pretty good in my stang