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Author Topic:   Carb jetting for high humidity
67Coupster
Gearhead

Posts: 189
From: Fortson, GA, USA
Registered: Oct 2001

posted 04-15-2002 06:47 AM     Click Here to See the Profile for 67Coupster   Click Here to Email 67Coupster     Edit/Delete Message   Reply w/Quote
Don't you jet down for high humidity conditions? When I was at the track yesterday it was very humid and a racer said to me I needed to richen it up because it was so humid. I thought when you have conditions like that you jet down to compensate for the lesser amout of air that the motor is taking in. Just checking

------------------
James
67 Coupe
393W, AFR 185, 4 Speed, 4.11 9 inch
7.09 @ 97MPH 1/8
1.55 60'

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steve'66
Gearhead

Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000

posted 04-15-2002 06:47 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
James,

I don't know about changing jetting just for a humidity change. Density altitude is much more important, and humidity is a factor in D/A but not all of the puzzle.

SteveW

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67Coupster
Gearhead

Posts: 189
From: Fortson, GA, USA
Registered: Oct 2001

posted 04-15-2002 09:02 PM     Click Here to See the Profile for 67Coupster   Click Here to Email 67Coupster     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by steve'66:
James,

I don't know about changing jetting just for a humidity change. Density altitude is much more important, and humidity is a factor in D/A but not all of the puzzle.

SteveW


Thanks Steve, I've got a lot to learn about carb tuning. Been playing with fuel injection too long, it makes it easy.

------------------
James
67 Coupe
393W, AFR 185, 4 Speed, 4.11 9 inch
7.09 @ 97MPH 1/8
1.55 60'

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steve'66
Gearhead

Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000

posted 04-15-2002 09:22 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
James,

I hope others chime in and educate both of us. I'm still trying to learn how to equate weather to predicted et's. I wouldn't try to re-tune for weather changes, just like to know what their effect is on the dial in.

SteveW

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jsracingbbf
Gearhead

Posts: 2954
From: Batesville,MS. , U.S.A.
Registered: Mar 2002

posted 04-15-2002 09:51 PM     Click Here to See the Profile for jsracingbbf   Click Here to Email jsracingbbf     Edit/Delete Message   Reply w/Quote
Hey guys I learned a little bit about Air Density and weather stations by reading articles on them. I am by no means an expert. I can however give you a link to a great explanation on the subject. It really helped me allot. I printed a copy out to refer to in the trailer. Hope this helps! http://www.staginglight.com/guide/air.html

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Jerry Smith
69 Pro ET Mustang
514 cid Alcohol/ Enderle injection
5.60'[email protected] 119 MPH 1/8th

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steve'66
Gearhead

Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000

posted 04-15-2002 10:06 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Thanks Jerry,

That article is what I meant to say.


SteveW

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67Coupster
Gearhead

Posts: 189
From: Fortson, GA, USA
Registered: Oct 2001

posted 04-16-2002 07:08 AM     Click Here to See the Profile for 67Coupster   Click Here to Email 67Coupster     Edit/Delete Message   Reply w/Quote
Great article Jerry, thanks!

------------------
James
67 Coupe
393W, AFR 185, 4 Speed, 4.11 9 inch
7.09 @ 97MPH 1/8
1.55 60'

IP: Logged

jsracingbbf
Gearhead

Posts: 2954
From: Batesville,MS. , U.S.A.
Registered: Mar 2002

posted 04-16-2002 08:48 PM     Click Here to See the Profile for jsracingbbf   Click Here to Email jsracingbbf     Edit/Delete Message   Reply w/Quote
Any time guys, maybe I'm good for something after all Happy racing and kick some Camaro butt it will make your day!

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