unklej

iTrader: (1)

Here's all of my track data:

Pre ram air with only Magnaflow exhaust and tonneau cover.

11/21/2004 (With Magnaflow and tonneau cover)
55 deg and 60% humidity Got to track at 1:30
Time --1:40 --2:32 --4:00 -- All in 3rd gear
R/T --0.227 --0.185 --0.577
60' --2.279 --2.291 --2.407
330' --6.436 --6.387 --6.515
1/8 --9.866 --9.777 --9.918
MPH --72.43 --73.36 --72.91
1000' --12.782--12.664 --12.819
1/4 --15.299--15.164 --15.326
MPH --88.76 --89.52 --89.03

Notes:
Run 1 - hot motor
Run 2 - cool motor
Run 3 - Spun out of the hole

Best time is 15.164@89.52


Now with ram air, stock paper filter (A1518C), airaid MIT, weather very similar to november best.

5/6/2005 (With above, Air raid MIT, and ram air)
53 deg and 50% humidity --Got to the track at 6:10pm.
Time --6:49 --7:15 --8:47 --9:14 --9:50 --All in 3rd gear
R/T --0.353 --0.335 --0.482 --0.385 --0.222
60' --2.239 --2.251 --2.241 --2.278 --2.253
330' --6.314 ------ --6.312 --6.384 --6.338
1/8 --9.703 --11.691 --9.687 --9.784 --9.72
MPH --73.51 --42.22 --73.75 --73.12 --73.68
1000' --12.593 --17.241 --12.567 --12.68 --12.605
1/4 --15.106 --22.362 --15.061 --15.184 --15.102
MPH --89.02 --41.47 --89.89 --89.37 --89.83

Best time 15.061@89.89

Notes:
Run 1 - started out in OD then switched into 3rd during run
Run 2 - oil on track, spun like a ****
Run 3 - Engine was as cool as the 15.164 run on 11/21/04, ~170 deg, best run of 15.061@89.89
Run 4 - Hot engine
Run 5 - Hot engine and blocked off factory air box holes to create a "true" ram air setup. This setup shows potential at teh track, but lacked tip in power on the drive home. May be quicker than Run 3 if teh motor was cool.


Now yesterday (I removed airaid MIT and put the stock tube back in)

5/13/2005 (With Magnaflow and ram air (no airaid mit))
58 deg and 50% humidity --Got to the track at 6:25pm.
Time --6:56 --7:58 --8:40 --9:48 --10:10 --All in 3rd gear
R/T --0.255 --0.278 --0.312 --0.36 --0.332
60' --2.247 --2.318 --2.259 --2.272 --2.248
330' ------ --6.427 --6.392 --6.385 --6.354
1/8 --9.726 --9.816 --9.787 --9.781 --9.756
MPH --73.43 --73.46 --73.19 --73.15 --73.14
1000' --12.609 --12.703 --12.674 --12.672 --12.653
1/4 --15.099 --15.201 --15.164 --15.166 --15.16
MPH --89.98 --89.69 --89.9 --89.74 --89.48

Notes:
Run 1 - Engine was not hot but not cool, basically just drove through lanes and went on track. Paper air filter, stock tube
Run 2 - K&N Filter, hot motor, lots of idleing in lanes, spun out the hole
Run 3 - K&N filter, Hot motor, lots of idleing in lanes
Run 4 - Paper air filter, hot motor.
Run 5 - Paper air filter, hot motor.

So, some conclusions.

1) It seems that I gained ~.1 seconds in the quarter with the ram air mods (air box holes open). Maybe more in true ram air form.

2) With a hot motor I'm slightly quicker than my previous best without the ram air and on a cool motor. So there was an improvement.

3) Airaid MIT is maybe worth a few hundreds, maybe. I couldn't get a cool motor due to the amount of people at the track and the idleing times in the lanes.

4) K&N panel filter showed no improvement. I read other posts saying the same or saying that they actually lost power with the K&N. I have proven to myself that there is merit to others claims and that there is really no gain with it.


pics are here https://ls1tech.com/forums/showthread.php?t=315183

Jeff

moregrip

iTrader: (8)

thanks for all that testing! looks good! can't argue with a solid 1/10th

TXsilverado

iTrader: (19)

great info! love the controled tests. its way better than 20 different oppinions with no evidence to back it up

Sport Side

iTrader: (6)

Thanks Jeff.

therock

iTrader: (2)

...ram air only becomes positive pressure at or above 100 mph. I had a 1970 Road Runner with a 440 6-Pack. It ran a consistant solid 13 in the 1/4. This ram air calculation figure was common knowledge back then. You are getting a real good source of cool air though.

unklej

iTrader: (1)

No problem, I'm an engineer and totally ****, so I thrive on the details.

Jeff

F8L Z71

What race track was this at? Any elevation details?

If you truely want to map this out simply take the elevation of your track and input the weather details for each time you raced and you can come up with the Density Altitude for each run. This will give you the most accurate results of each run.

Get detailed weather for each run here. Find your location and input the date you ran and if you scroll down a bit it will show you results for that day in 1hr incriments. http://www.weatherunderground.com/

DA Calculator
http://www.weatherunderground.com/

DA can easily create changes of 1-3 10ths of a second in a single night. The other night I watched just about everyone around me drop 1-2mph in the course of 3 hours as the DA slowly got worse when the dew point went up which usually happens a couple hours after the sun goes down.

unklej

iTrader: (1)

so here is the track data and DA info. Track elevation of Island dragway is 1012ft.

11-21-04

run 1 - DA=601, Hot motor, 15.299@88.76
run 2 - DA=639. Cold motor (~170 deg), 15.164@89.52
run 3 - DA=376, cold motor, spun out of the hole, 15.326@89.03

5-6-05

run 1 - DA=429, switched gears, med temp motor, 15.106@89.02
run 2 - DA=409, oil on track, 22.362@41.47
run 3 - DA=307, cold motor, 15.061@89.89
run 4 - DA=267, hot motor, 15.184@89.37
run 5 - DA=260, hot motor, true ram air, 15.102@89.83

5-13-05

run 1 - DA=1192, med temp motor, paper filter, 15.099@89.98
run 2 - DA=959, hot motor, K&N filter, slight spin out of hole, 15.201@89.69
run 3 - DA=806, hot motor, K&N filter, 15.164@89.9
run 4 - DA=685, hot motor, Paper filter, 15.166@89.74
run 5 - DA=599, hot motor, paper filter, 15.160@89.48

So, it definitely looks like 5-6-05 was the best day to run, but over these three days engine temp was a big factor on which run was quicker. I still believe I gained a tenth from the ram air/fresh air system.

So, the question is this... I know DA tells me what the effective air altitude was at the time I ran and I believe that the lower that value is the better, but what else should it tell me?

Jeff

F8L Z71

That must have taken awhile. LOL

Bascially just what your truck should be running on a given day if you track this regularly. IE like if you make a run on a day in late fall when the DA is great, then you add a couple small mods and run again in the summer you may come out even. The reason is because of the effective DA and how oxygen dense the air is. In high DA obviously there is less oxygen so the truck wont be as fast.

There are a lot of people who don't know about this stuff so they will mistkenly believe that the mods they put on were not worth anything at the track when in realizty is was teh DA that made the truck slower or faster than it was the previous time. The truck being hot or cold can play a part too but I find that LS1 based trucks and cars run faster when fully warmed up but without a hot tranny. You don't want em cold nor hot.

unklej

iTrader: (1)

Got ya, It only took me a few minutes...hehe

So what can you tell from my DA's and times? I feel that most of my previous statements were correct on the MIT and the K&N, but it just may be that my truck (as close to stock as it is) doesn't need any more air.

Jeff