Humidity=power loss. How much?

Rev · 10-13-2001, 12:36 AM

Went to the track tonight and made 6 runs, Was hoping for some improvement after installing a new Road Demon carb.

In a nutshell, I didn't get it. I ran only 14.0 @99. My absolute best times previous were 13.95 @100. Those best times were in 2/2001 at about 50 F and fairly dry. These times were at 75-80 F and 96% humidity.

I know the warmer and more humid weather hurt me some in comparison to those best time slips. Just wondering if anyone has an opinion as to how much that humidity and extra 25-30 F hurt me tonight.

I've heard that each 10 F lowers HP by 1%. Not too sure about humidity losses.

Rev

------------------
'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.

[This message has been edited by Rev (edited 10-13-2001).]

8850 · 10-13-2001, 05:35 PM

Give this site a try. It should tell you exactly what you want to know.
http://xs-fx.com/da/ws.htm

------------------
88 347, Twisted wedge heads,Comp Cams 224/230 cam, 1/4=10.516 @ 126.27, 60' = 1.446 http://xs-fx.com/raughammer/larrysample.htm

Rev · 10-13-2001, 07:30 PM

Thanks 8850, that link was exactly what I needed.

Rev

------------------
'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.

Skyman · 10-14-2001, 02:13 AM

So how much gain did that new carb getcha REV?

Skyyyyyyyyyyyyyyyyyyyyyyyyyyler

Fuckin fastest stang in this whole moootherfuuucking hick *** town.

12.5's on slicks with out the nitrous.

Skyler

------------------
-1989 Saleen Mustang #406-
TFS TW Heads, E-303, Edelbrock intake, 70mm TB, 73mm MAF, 24lb injectors, 1 5/8 shorties, Off Road H, 3 Chamber flows, Jaz Race seats, Back seat removed, sub-frames, Roll Cage, and a 80 shot of N20.
12.54@107.4 Motor
332RWHP, 350rwtq

Rev · 10-14-2001, 03:22 PM

Sky, it hasn't given me anything so far. But I'm thinking with good air 60 F and 50-60% rel. humidity, that I may get a 13.8/101 out of it. That's what the link from 8850 said and that's what my Drag Analyzer program says. That's all coulda, shoulda, woulda stuff until I actually get a time slip that verifies it though. Thanks for the interest. I did get a 13.83/107 G-Tech out of it late one 60 F 60% rel. humidity night on a lightly traveled freeweay just outside of Houston. That's about .2 and 2 mph faster than usual.

Rev

------------------
'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.

[This message has been edited by Rev (edited 10-14-2001).]

10-13-2001, 12:36 AM	#1
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	Humidity=power loss. How much? Went to the track tonight and made 6 runs, Was hoping for some improvement after installing a new Road Demon carb. In a nutshell, I didn't get it. I ran only 14.0 @99. My absolute best times previous were 13.95 @100. Those best times were in 2/2001 at about 50 F and fairly dry. These times were at 75-80 F and 96% humidity. I know the warmer and more humid weather hurt me some in comparison to those best time slips. Just wondering if anyone has an opinion as to how much that humidity and extra 25-30 F hurt me tonight. I've heard that each 10 F lowers HP by 1%. Not too sure about humidity losses. Rev ------------------ '66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph 1/4 mi. [This message has been edited by Rev (edited 10-13-2001).]

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10-13-2001, 05:35 PM	#2
8850 Registered Member Join Date: Nov 1998 Location: Sugarland, TX USA Posts: 161	Give this site a try. It should tell you exactly what you want to know. http://xs-fx.com/da/ws.htm ------------------ 88 347, Twisted wedge heads,Comp Cams 224/230 cam, 1/4=10.516 @ 126.27, 60' = 1.446 http://xs-fx.com/raughammer/larrysample.htm

10-13-2001, 07:30 PM	#3
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	Thanks 8850, that link was exactly what I needed. Rev ------------------ '66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph 1/4 mi.

10-14-2001, 02:13 AM	#4
Skyman I need 110mph Trap Speed! Join Date: Feb 1999 Location: So, CA Posts: 4,315	So how much gain did that new carb getcha REV? Skyyyyyyyyyyyyyyyyyyyyyyyyyyler Fuckin fastest stang in this whole moootherfuuucking hick * town. 12.5's on slicks with out the nitrous. Skyler ------------------ -1989 Saleen Mustang #406- TFS TW Heads, E-303, Edelbrock intake, 70mm TB, 73mm MAF, 24lb injectors, 1 5/8 shorties, Off Road H, 3 Chamber flows, Jaz Race seats, Back seat removed, sub-frames, Roll Cage, and a 80 shot of N20. 12.54@107.4 Motor 332RWHP, 350rwtq**

10-14-2001, 03:22 PM	#5
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	Sky, it hasn't given me anything so far. But I'm thinking with good air 60 F and 50-60% rel. humidity, that I may get a 13.8/101 out of it. That's what the link from 8850 said and that's what my Drag Analyzer program says. That's all coulda, shoulda, woulda stuff until I actually get a time slip that verifies it though. Thanks for the interest. I did get a 13.83/107 G-Tech out of it late one 60 F 60% rel. humidity night on a lightly traveled freeweay just outside of Houston. That's about .2 and 2 mph faster than usual. Rev ------------------ '66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph 1/4 mi. [This message has been edited by Rev (edited 10-14-2001).]