Hot weather STINKS !!
Do you thinik the DA affects LT-1"s ?...
Thread Starter
Race Director
Joined: Oct 2001
Posts: 19,653
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From: Melbourne Florida
Cruise-In IV Veteran
Do you thinik the DA affects LT-1"s ?...
I went to a test n tune tonite to practice on the tree for my saturday points event...I got in 5 passes..the weather was Africa hot and Brazil humid and the DA was over 4000 all night...at 6 PM the temp was 94* and the humidity was 95%...the heat index was 110...Ugh!
I ran as follows: 14.46, 14.10, 14.21 and 14.35 all while deep staged...my last pass I did not go in deep and ran 14.01 spinning like crazy out of the hole...my 60' times ranged from 2.02 to 2.13..
Now, considering the above numbers, last February in the same car, same driver (me) I got 7 passes at the National event in Richmond, Va....the air temps were from 40 to 50 degrees and the DA was from -100 to + 400...my times ranged from a low of 13.19 to a high of 13.26 for all 7 runs...my 60' times ranged from 1.78 to 1.83... a full second difference in ET due to weather alone is amazing...both tracks hooked the same with the exception of my last run tonite...
My point is don't underestimate the power of the weather conditions on your ET's if you have an LT-1...they hate the hot, nasty weather which I proved once again tonite...
I ran as follows: 14.46, 14.10, 14.21 and 14.35 all while deep staged...my last pass I did not go in deep and ran 14.01 spinning like crazy out of the hole...my 60' times ranged from 2.02 to 2.13..
Now, considering the above numbers, last February in the same car, same driver (me) I got 7 passes at the National event in Richmond, Va....the air temps were from 40 to 50 degrees and the DA was from -100 to + 400...my times ranged from a low of 13.19 to a high of 13.26 for all 7 runs...my 60' times ranged from 1.78 to 1.83... a full second difference in ET due to weather alone is amazing...both tracks hooked the same with the exception of my last run tonite...
My point is don't underestimate the power of the weather conditions on your ET's if you have an LT-1...they hate the hot, nasty weather which I proved once again tonite...
Last edited by Fuzzy Dice; Aug 8, 2007 at 11:12 PM.
Thread Starter
Race Director
Joined: Oct 2001
Posts: 19,653
Likes: 428
From: Melbourne Florida
Cruise-In IV Veteran
Melting Slicks
Joined: Nov 2004
Posts: 2,799
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From: Cape Coral FL
I went to a test n tune tonite to practice on the tree for my saturday points event...I got in 5 passes..the weather was Africa hot and Brazil humid and the DA was over 4000 all night...at 6 PM the temp was 94* and the humidity was 95%...the heat index was 110...Ugh!
I ran as follows: 14.46, 14.10, 14.21 and 14.35 all while deep staged...my last pass I did not go in deep and ran 14.01 spinning like crazy out of the hole...my 60' times ranged from 2.02 to 2.13..
Now, considering the above numbers, last February in the same car, same driver (me) I got 7 passes at the National event in Richmond, Va....the air temps were from 40 to 50 degrees and the DA was from -100 to + 400...my times ranged from a low of 13.19 to a high of 13.26 for all 7 runs...my 60' times ranged from 1.78 to 1.83... a full second difference in ET due to weather alone is amazing...both tracks hooked the same with the exception of my last run tonite...
My point is don't underestimate the power of the weather conditions on your ET's if you have an LT-1...they hate the hot, nasty weather which I proved once again tonite...
I ran as follows: 14.46, 14.10, 14.21 and 14.35 all while deep staged...my last pass I did not go in deep and ran 14.01 spinning like crazy out of the hole...my 60' times ranged from 2.02 to 2.13..
Now, considering the above numbers, last February in the same car, same driver (me) I got 7 passes at the National event in Richmond, Va....the air temps were from 40 to 50 degrees and the DA was from -100 to + 400...my times ranged from a low of 13.19 to a high of 13.26 for all 7 runs...my 60' times ranged from 1.78 to 1.83... a full second difference in ET due to weather alone is amazing...both tracks hooked the same with the exception of my last run tonite...
My point is don't underestimate the power of the weather conditions on your ET's if you have an LT-1...they hate the hot, nasty weather which I proved once again tonite...
Looking at the Fuzzy's numbers, it would appear that the engine's running on the fat side, which would explain why it falls off so dramatically in summer heat. Heat soak (a known LTx issue) is another likely culprit. Engines that are lean can actually pick up performance in worse air, but this is more confined to carbed engines as a general rule, and I don't think he's running lean. Some time spent with a WEGO would confirm AFR.
Maybe an Air-Gap intake would alleviate some of the heat soak, but without any "real world" test results, I don't know. I'm trying one on my own LT1, but until I get some real numbers, I won't say for certain one way or the other.
My Chevelle, on the other hand.... summer to winter, it would pick up 2.5 tenths and 1 MPH (but it was a carbureted BBC).
Le Mans Master
Joined: Aug 2004
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From: Metairie Louisiana
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Thread Starter
Race Director
Joined: Oct 2001
Posts: 19,653
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From: Melbourne Florida
Cruise-In IV Veteran
I have a 160 stat and the fans reprogrammed...EWP is a thought...
Robert.....5 years ago I had a new chip burned which sets my A/F at 12.9 @ WOT...I scanned it last year and it was still holding at 12.9 WOT...I really think it is just LT-1 heat soak...the LS-X motors are not affected by the heat nearly as much for some reason...
Robert.....5 years ago I had a new chip burned which sets my A/F at 12.9 @ WOT...I scanned it last year and it was still holding at 12.9 WOT...I really think it is just LT-1 heat soak...the LS-X motors are not affected by the heat nearly as much for some reason...
Racer
Joined: Nov 2002
Posts: 420
Likes: 0
From: palm harbor fl
when i was in california my car ran a 12.20 in cool weather,I ran at bradenton last month,similar weather to what you ran in fuzzy,best time i could muster was a 12.90.difference of 7 tenths.My car had no power up top and mph was down 10 mph,and yes the ls motors don't have a big heat soak problem as the lt1's.
Melting Slicks
Joined: May 2001
Posts: 3,014
Likes: 18
From: Raleigh, NC
Try racing in Utah, lol. A good night there is 7,000, a bad night is over 10k. My car picked up 11 tenths when I moved to a sea level track. You read that right, 1.1 seconds from elevation.
Melting Slicks
Joined: Mar 2002
Posts: 3,108
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From: S.L.C. UT
Thread Starter
Race Director
Joined: Oct 2001
Posts: 19,653
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From: Melbourne Florida
Cruise-In IV Veteran
...see now you guys are just trying to make me feel better...you guys have to make 800 rwhp to get in the 13's up on the mountain...
Instructor
Joined: Aug 2007
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Actually it would take the same amount of HP at 500 DA to run 13 as it would at 4000 DA. Just takes a bigger engine at the higher DA because said engine may produce 800 hp at 500 DA but much less at 4000 DA.