Racing and shifting ????2001 Lightning
Thread Starter
|
Member
Joined: Apr 2001
Posts: 45
Likes: 0
From: CA
Racing and shifting ????2001 Lightning
About shifting when lining up to race should you disable over drive or just leave it on does it matter ?? And about what RPM should you shift at before the governor kicks on??
Senior Member
Joined: Apr 2000
Posts: 12,632
Likes: 1
From: Stinkin Joisey
The computer IS SMARTER than you, let it shift your truck. If you are racing in the 1/4 mile, you wont reach the speed at WOT that the OD will engage. So just leave your truck in drive with the od on and enjoy!!!!
Senior Member
Joined: May 2001
Posts: 458
Likes: 0
From: HAMPTON,ILL, ROCK ISLAND
Yep,turn the od off and lets the tranny do it's thing.If you have a bed cover leave it on,if not put the tailgate down.......
And fgor the cowboy from Texas guess my 8.16 might just be a bit faster,ya thunk????
J MAN
And fgor the cowboy from Texas guess my 8.16 might just be a bit faster,ya thunk????
J MAN
Thread Starter
|
Member
Joined: Apr 2001
Posts: 45
Likes: 0
From: CA
Ok thanks for all the info!! but the other day when racing my truck I started out i low and then took off when i shifted in 2sec i got a cherp doesn't that mean its shifting harder???
Last edited by 2001Red killer; Jul 5, 2001 at 01:42 AM.
Senior Member
Joined: Apr 2000
Posts: 12,632
Likes: 1
From: Stinkin Joisey
O yeah, turning off the od when running the 1/8 mile doesn't make a friggin difference. It's been proven leaving the tailgate up/down doesn't make a difference, if you want to make a difference with the tailgate, TAKE IT OFF AND i could have more trophys if I wanted to run the 1/8 mile bracket racing against 4x4 and such IMHO
Trending Topics
Senior Member
Joined: Jun 2000
Posts: 648
Likes: 0
From: Milford, Ohio USA
Every greasy redneck at the track (this is NOT directed at any of the previous posters) will be screaming for you to put the tailgate down "to help out the airy-dynamics and such". Believe me, I've been there.
Funny thing is, air flowing over strangely-shaped solids, especially when turbulent (high Reynolds numbers) doesn't behave like we would always expect or wish it to. The fact is, dropping the tailgate, in addition to making your truck look stupid, actually INCREASES the drag coefficient of your otherwise slippery (but HUGE frontal area) Lightning. I've seen some wind tunnel data (someone posted a link a while back), plus run the experiment at the track with my bud's NASCAR edition. Dropping the 'gate will slow you down slightly due to an INCREASE in the drag coefficient. It may not look like it, but it will. Trust me on this one.
The overdrive button will not help or hinder you one bit. My advice is to forget about it entirely. You already have enough to worry about at the staging area/starting line without that additional distraction.
What will work? Turn off the A/C. Fold in your mirrors. That's about it, as far as I can tell. On the last yellow, mash it to the floor and steer straight.
Funny thing is, air flowing over strangely-shaped solids, especially when turbulent (high Reynolds numbers) doesn't behave like we would always expect or wish it to. The fact is, dropping the tailgate, in addition to making your truck look stupid, actually INCREASES the drag coefficient of your otherwise slippery (but HUGE frontal area) Lightning. I've seen some wind tunnel data (someone posted a link a while back), plus run the experiment at the track with my bud's NASCAR edition. Dropping the 'gate will slow you down slightly due to an INCREASE in the drag coefficient. It may not look like it, but it will. Trust me on this one.
The overdrive button will not help or hinder you one bit. My advice is to forget about it entirely. You already have enough to worry about at the staging area/starting line without that additional distraction.
What will work? Turn off the A/C. Fold in your mirrors. That's about it, as far as I can tell. On the last yellow, mash it to the floor and steer straight.
Senior Member
Joined: Jan 2001
Posts: 1,467
Likes: 0
From: La Habra, CA
Leave the tailgate up. Let the computer shift and enjoy the run.
Wind tunnel test should confirm that the drag will go up with the tailgate down. We ran an S10 for Gale Banks at B'ville. GM did the testing, and confirmed this. The truck ran 210 MPH with a modified V-6.
Wind tunnel test should confirm that the drag will go up with the tailgate down. We ran an S10 for Gale Banks at B'ville. GM did the testing, and confirmed this. The truck ran 210 MPH with a modified V-6.
Senior Member
Joined: Oct 2000
Posts: 237
Likes: 0
From: Texas. USA
Any improved drag coefficiency w/tonneau...
Silver-Y2K-SVT,
Have you seen any flow improvments when one of our trucks has a hard tonneau on the bed? I'm running a Leer on my 2001 L and we seem to be getting a little increase in fuel economy.. also more control in handeling in high side winds and such.
Have you seen any flow improvments when one of our trucks has a hard tonneau on the bed? I'm running a Leer on my 2001 L and we seem to be getting a little increase in fuel economy.. also more control in handeling in high side winds and such.
Banned For Rules Violations
Joined: Mar 2001
Posts: 1,585
Likes: 0
From: Mobile, AL, USA
ALTHOUGH if you were able to, the truck would run FASTER if it was shifted at 5,500 rpm. That's what a CHIP is for, though.
Do a search for optimal shift points posted from me.
BfB
Do a search for optimal shift points posted from me.
BfB
Last edited by BfB; Jul 5, 2001 at 02:31 PM.
Senior Member
Joined: Jun 2000
Posts: 648
Likes: 0
From: Milford, Ohio USA
XJMD':
I'm not an aerodynamicist. Actually, I make paper for a living (ugh!). However, I have studied fluid mechanics at both the graduate and post-graduate level, so perhaps I'm qualified to comment...
As for a hard tonneau, I seem to recall (from the same thread/study) that a tonneau reduced the drag a little bit. You gain in drag reduction, gain in traction (a little more weight over the rear wheels), and lose in overall vehicle weight. On the salt flats (where drag is all that matters), you might gain a few MPH. At the 'strip, I'm not sure what the overall composite effect will be (probably a slight, and I mean SLIGHT gain).
The tonneaus do look nice, though. I suppose that they make the roof harder to wash, but they do look nice.
I'm not an aerodynamicist. Actually, I make paper for a living (ugh!). However, I have studied fluid mechanics at both the graduate and post-graduate level, so perhaps I'm qualified to comment...
As for a hard tonneau, I seem to recall (from the same thread/study) that a tonneau reduced the drag a little bit. You gain in drag reduction, gain in traction (a little more weight over the rear wheels), and lose in overall vehicle weight. On the salt flats (where drag is all that matters), you might gain a few MPH. At the 'strip, I'm not sure what the overall composite effect will be (probably a slight, and I mean SLIGHT gain).
The tonneaus do look nice, though. I suppose that they make the roof harder to wash, but they do look nice.
