How much does DA affect Horsepower?
Thread Starter
Race Director
Joined: Mar 2000
Posts: 17,602
Likes: 20
From: Palm City Florida
How much does DA affect Horsepower?
I am shooting for the ellusive goal of 11.99 in my car..
I have an MN6, 4.10's and 345 rear wheel HP. Don't know the DA at time of Dyno but it was 94.38 degrees and 30.13hg with a 1.01 SAE (whatever the hell that means)
Ranger has driven a stock 01 Z06 (about 327 RWHP) into the 11.94 territory with drag radials. I saw the DA on his slip and it was like a Negative figure.. Weather was 53 degrees; humidity 47% barometer 30.24 for a DA of –151 feet
This weekend at the challenge the DA got into the +700's. so.. Is it going to be possible to get this 11.99 with drag radials in Florida? or do I need to wait till it drops into the high 30's one night in Feb...
So my car has more HP the benefit of 4.10's.. 
I have an MN6, 4.10's and 345 rear wheel HP. Don't know the DA at time of Dyno but it was 94.38 degrees and 30.13hg with a 1.01 SAE (whatever the hell that means)
Ranger has driven a stock 01 Z06 (about 327 RWHP) into the 11.94 territory with drag radials. I saw the DA on his slip and it was like a Negative figure.. Weather was 53 degrees; humidity 47% barometer 30.24 for a DA of –151 feet
This weekend at the challenge the DA got into the +700's. so.. Is it going to be possible to get this 11.99 with drag radials in Florida? or do I need to wait till it drops into the high 30's one night in Feb...
So my car has more HP the benefit of 4.10's..
Team Owner
Joined: Jul 2001
Posts: 182,997
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From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
It all depends on how fast you are already going.. A 10 second car will get less improvement than a 15 second car..
On my old automatic factory stock C5, I ran 13.85 in summer in Florida and a best of about 13.35 in South Carolina in February...a full .5 difference..
On my old automatic factory stock C5, I ran 13.85 in summer in Florida and a best of about 13.35 in South Carolina in February...a full .5 difference..
Team Owner
Joined: Nov 1999
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From: Former NCM Drag Racing coordinator, National director Corvette Challenge Spring Hill, Tennessee: Whiting, New Jersey
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Le Mans Master
Joined: Mar 2004
Posts: 5,562
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From: South East coast Florida
I am shooting for the ellusive goal of 11.99 in my car..
I have an MN6, 4.10's and 345 rear wheel HP. Don't know the DA at time of Dyno but it was 94.38 degrees and 30.13hg with a 1.01 SAE (whatever the hell that means)
Ranger has driven a stock 01 Z06 (about 327 RWHP) into the 11.94 territory with drag radials. I saw the DA on his slip and it was like a Negative figure.. Weather was 53 degrees; humidity 47% barometer 30.24 for a DA of –151 feet
This weekend at the challenge the DA got into the +700's. so.. Is it going to be possible to get this 11.99 with drag radials in Florida? or do I need to wait till it drops into the high 30's one night in Feb... So my car has more HP the benefit of 4.10's..
I have an MN6, 4.10's and 345 rear wheel HP. Don't know the DA at time of Dyno but it was 94.38 degrees and 30.13hg with a 1.01 SAE (whatever the hell that means)
Ranger has driven a stock 01 Z06 (about 327 RWHP) into the 11.94 territory with drag radials. I saw the DA on his slip and it was like a Negative figure.. Weather was 53 degrees; humidity 47% barometer 30.24 for a DA of –151 feet
This weekend at the challenge the DA got into the +700's. so.. Is it going to be possible to get this 11.99 with drag radials in Florida? or do I need to wait till it drops into the high 30's one night in Feb...
So my car has more HP the benefit of 4.10's.. Hope you have better skill at driving than I, good luck 
Race Director
Joined: Oct 2001
Posts: 19,653
Likes: 428
From: Melbourne Florida
Cruise-In IV Veteran
DA can have a huge effect on your HP...my best was 13.41 until I ran into +600 DA a year ago...I promptly ran 13.18 and that was with a chip problem...I know I was headed to 13.0X when my car nosed over at 1000'...btw, everything was better...my short time was 1.79 and my 1/8 mile time was 8.39...all this with 250 rwhp according to the dyno...
Thread Starter
Race Director
Joined: Mar 2000
Posts: 17,602
Likes: 20
From: Palm City Florida
DA can have a huge effect on your HP...my best was 13.41 until I ran into +600 DA a year ago...I promptly ran 13.18 and that was with a chip problem...I know I was headed to 13.0X when my car nosed over at 1000'...btw, everything was better...my short time was 1.79 and my 1/8 mile time was 8.39...all this with 250 rwhp according to the dyno...
Problem is... What is the lowest DA we ever see here in FL? and When ?
Race Director
Joined: Aug 2000
Posts: 10,649
Likes: 32
From: Central Florida
By far the biggest impact on the ET/Trap of a traction-limited manual-tranny car is the driving, followed by traction, and then weather...in that order, in my experience.
Excellent ETs and traps can be had even in sub-optimal weather. Conversely, even fabulous weather will not bring great times if the driving is not quite-good.
Also, Chuckster, when my 01 Z06 ran 11.94, it was my first time out on BFG drag radials; my 60' was only 1.82, as I was still trying to figure out the burnout. At the time the car had 345 rwhp and 349 rwtq. The 330'-1320' incremental for that pass was 6.94.
Where you are now, you need the burnout and the launch rpm right. Right clutch release and then three strong shifts just shy of the rev-limiter. That done, you'll be in the very-low 12s. Done optimally, may dip into the 11s. With 353 rwhp and good driving, my 02 Z on DRs ran 11.8Xs at 3500' DA.
So, you'll get there.
Ranger
Excellent ETs and traps can be had even in sub-optimal weather. Conversely, even fabulous weather will not bring great times if the driving is not quite-good.
Also, Chuckster, when my 01 Z06 ran 11.94, it was my first time out on BFG drag radials; my 60' was only 1.82, as I was still trying to figure out the burnout. At the time the car had 345 rwhp and 349 rwtq. The 330'-1320' incremental for that pass was 6.94.
Where you are now, you need the burnout and the launch rpm right. Right clutch release and then three strong shifts just shy of the rev-limiter. That done, you'll be in the very-low 12s. Done optimally, may dip into the 11s. With 353 rwhp and good driving, my 02 Z on DRs ran 11.8Xs at 3500' DA.
So, you'll get there.
Ranger
Last edited by Ranger; Jan 23, 2007 at 03:24 PM.
Thread Starter
Race Director
Joined: Mar 2000
Posts: 17,602
Likes: 20
From: Palm City Florida
By far the biggest impact on the ET/Trap of a traction-limited manual-tranny car is the driving, followed by traction, and then weather...in that order, in my experience.
Excellent ETs and traps can be had even in sub-optimal weather. Conversely, even fabulous weather will not bring great times is the driving is not quite good.
Also, Chuckster, when my 01 Z06 ran 11.94, it was my first time out on BFG drag radials; my 60' was only 1.83, as I was still trying to figure out the burnout. At the time the car had 345 rwhp and 349 rwtq. The 330'-1320' incremental for that pass was 6.94.
Where you are now, you need the burnout and the launch rpm right. Right clutch release and then three strong shifts just shy of the rev-limiter. That done, you'll be in the very-low 12s. Don't optimally, may dip into the 11s. With 353 rwhp and good driving, my 02 Z on DRs ran 11.8Xs at 3500' DA.
So, you'll get there.
Ranger
Excellent ETs and traps can be had even in sub-optimal weather. Conversely, even fabulous weather will not bring great times is the driving is not quite good.
Also, Chuckster, when my 01 Z06 ran 11.94, it was my first time out on BFG drag radials; my 60' was only 1.83, as I was still trying to figure out the burnout. At the time the car had 345 rwhp and 349 rwtq. The 330'-1320' incremental for that pass was 6.94.
Where you are now, you need the burnout and the launch rpm right. Right clutch release and then three strong shifts just shy of the rev-limiter. That done, you'll be in the very-low 12s. Don't optimally, may dip into the 11s. With 353 rwhp and good driving, my 02 Z on DRs ran 11.8Xs at 3500' DA.
So, you'll get there.
Ranger
I checked your 11.94 run slip.. your differential was a bit better at (11.94-5.06) = 6.87
However, when I compare my slips... I don't have my 12.5 slip here at work but I looked at one of my 11.7 Runs I have a 7.17 (330-1320)differential. Between us that is only .298. Theoretically only a .98 for my 12.5 run. So it clearly shows I can get up and go after the 330.. I have trouble getting TO the 330..
I have by the way.. eeked low 1.9's on my street tires.. I think part of the problem is that I did not stay aggressive enough in 1st gear. i.e. My throttle squeeze was too slow...
I'll keep at it Master...
Race Director
Joined: Aug 2000
Posts: 10,649
Likes: 32
From: Central Florida
Properly heated DRs will take a very fast throttle squeeze, if the track prep is pretty good, and will help hook the 1-2 shift better. That Cartek clutch will help too.
Ranger
Race Director
Joined: Oct 2001
Posts: 19,653
Likes: 428
From: Melbourne Florida
Cruise-In IV Veteran
We will never see the "mineshaft" air they do up north...I have never heard of negative DA down here...honestly Chuck, it is not a lot of fun for us Florida guys to race in really low DA weather...most of us don't care for the cold....that day at BMP we all sat in our cars or huddled against some guys RV to get out of the wind...it was not a fun day...thank goodness for bracket racing since I'd rather run 14 sec in nice weather than 12's while freezing...
Thread Starter
Race Director
Joined: Mar 2000
Posts: 17,602
Likes: 20
From: Palm City Florida
My 01 Z06 had a Halltech Tric CAI, from which the motor got an extra 10 rwhp and 14 rwtq. My 11.94-5.00=6.94. 60' was 1.82.
Properly heated DRs will take a very fast throttle squeeze, if the track prep is pretty good, and will help hook the 1-2 shift better. That Cartek clutch will help too.
Ranger
Properly heated DRs will take a very fast throttle squeeze, if the track prep is pretty good, and will help hook the 1-2 shift better. That Cartek clutch will help too.
Ranger
I missed that extra 0...Thanks buddy... I need to start keeping track of how fast my throttle squeeze. And increase it a bit each time...
Thread Starter
Race Director
Joined: Mar 2000
Posts: 17,602
Likes: 20
From: Palm City Florida
We will never see the "mineshaft" air they do up north...I have never heard of negative DA down here...honestly Chuck, it is not a lot of fun for us Florida guys to race in really low DA weather...most of us don't care for the cold....that day at BMP we all sat in our cars or huddled against some guys RV to get out of the wind...it was not a fun day...thank goodness for bracket racing since I'd rather run 14 sec in nice weather than 12's while freezing...
I agree.... I seriously only want it for a personal best goal. I want to "DRIVE" my car into the 11's not "Power" it into the 11's. which I am sure I can do with heads and cam.. Once I know I can do that.. I'll feel better about modding it more.. ... I swear once I acheive it I will start dialing in 13.00's Far easier to dig into the pedal or stand on the brakes..