Re: Cool weather tune up?
[Re: tboomer]
#1090314
10/08/11 09:56 AM
10/08/11 09:56 AM
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Joined: Mar 2003
Posts: 2,515 PA
moparacer
master
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master
Joined: Mar 2003
Posts: 2,515
PA
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Just throw 2 in the front and 2 in the back for next weekend and let it alone this weekend? Just depends on what "tad" lean is...
67 Barracuda street/bracket car 11.27-119 68 Dart 502 BB 8.70s-152 414 cid SB Dragster 7.65-174
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Re: Cool weather tune up?
[Re: tboomer]
#1090316
10/08/11 10:30 AM
10/08/11 10:30 AM
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Joined: Nov 2003
Posts: 2,131 New Lenox IL
cudadon
top fuel
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top fuel
Joined: Nov 2003
Posts: 2,131
New Lenox IL
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Ted what makes you think you are lean? What did the carb come with from builder/manuf.? This weekend could be deceiving, the temp is up... But the Barom. is VERY high 30.32" A weather station is needed to keep track of DA/ ETs. The only way you can get a .1 sec ET on tuning is if you were WAAAAAAAY off to start with. More info and good luck, Don
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Re: Cool weather tune up?
[Re: cudadon]
#1090317
10/08/11 11:41 AM
10/08/11 11:41 AM
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Joined: Jan 2003
Posts: 25,957 United Socialist States of Ame...
tboomer
OP
Too Many Posts
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OP
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Posts: 25,957
United Socialist States of Ame...
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Thanks,Don! I haven't a clue as to what the carb had in it...I don't have a weather station but here is the best mph run from last weekend with the 90s in it Temperature...62.6 Humidity......16% Barometer.....30.27 Corrected Alt.1129' MPH...........103.95 Perhaps I should just leave it alone?
Need your rear end checked out? Contact Grizzly!!
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Re: Cool weather tune up?
[Re: tboomer]
#1090318
10/08/11 01:18 PM
10/08/11 01:18 PM
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Joined: May 2004
Posts: 3,210 robin hood country
deaks
master
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master
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Posts: 3,210
robin hood country
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Why not run it as is and then jet up on your next run and see what you pick up, or are you restricted on runs. Mick
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200# best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft best 60ft 1.36
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Re: Cool weather tune up?
[Re: tboomer]
#1090321
10/09/11 09:07 AM
10/09/11 09:07 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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As a round figure I use 20*... if the temp drops 20* I do a single jet change but this is dependent if you were on with the tune up
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Re: Cool weather tune up?
[Re: MRMOPAR622]
#1090324
10/09/11 01:34 PM
10/09/11 01:34 PM
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Joined: Jan 2003
Posts: 4,852 KENTUCKY
69CHARGERMD
master
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master
Joined: Jan 2003
Posts: 4,852
KENTUCKY
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I would use a weather station. Track the DA, temp, jet, etc. I have a "summer" tune and a "fall" tune...but usually leave it alone,,and dial the car to the weather...this way i know if something is going on with the car,,,if it falls off or picks up,,etc. Took a few seasons to "figure" it all out...but now i know what the car "should" do. Even won some $$ at Norwalk with my weather station...going rounds with Jack Moore Doug This is the weather station i used to have,,,then upgraded to a TAG,,,lol
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Re: Cool weather tune up?
[Re: tboomer]
#1090329
10/10/11 11:01 AM
10/10/11 11:01 AM
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Joined: Jan 2003
Posts: 16,928 NC
440Jim
I Live Here
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I Live Here
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NC
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Quote:
Carb is an 1150 Dominator
IMO, a Dominator carb is less sensitive to jet changes than most 4150 carbs. So to me, a 2 number jet change is very small. The big question is how close you had it jetted for 85º air (say 2500' DA). Going to 55º air (say 500' DA) I would richen it 4 jet numbers.
And as mentioned, the barometric pressure needs to be considered to really know the DA.
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Re: Cool weather tune up?
[Re: tboomer]
#1090330
10/10/11 11:09 AM
10/10/11 11:09 AM
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Joined: Jan 2003
Posts: 16,928 NC
440Jim
I Live Here
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I Live Here
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NC
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Quote:
Temperature...62.6 Humidity......16% Barometer.....30.27 Corrected Alt.1129'
Are those the track conditions (baro, etc)? Using the online calculator, those numbers are about minus 100 ft DA. If that is the reported aviation baro (corrected to sealevel), your track would have to be at 1000' elevation (like Tri State Raceway) to get 1129 DA (29.19"Hg actual track barometer).
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Re: Cool weather tune up?
[Re: tboomer]
#1090332
10/10/11 11:22 AM
10/10/11 11:22 AM
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Joined: Jan 2003
Posts: 16,928 NC
440Jim
I Live Here
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I Live Here
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Posts: 16,928
NC
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850-900 ft elevation sounds about right. There are a few, but this one has track's listed for elevation and "estimated" conditions for any day. After using their estimate, you can change the numbers to actual track and hit calculate again. The big thing is putting in the correct barometer, some calculators want "aviation" barometer and they correct to track elevation. Others want actual track barometer (most), or you can put in zero track elevation and actual track barometer. Drag Times calculator Also: http://wahiduddin.net/calc/calc_da_rh.htmAnd the tons of them at Wallace Raceing: http://www.wallaceracing.com/adi.php
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