As a very occasional Drag racer, I do not own a Weather Station for use at a Race Track. Most of my racing is here in the Mid-Atlantic [Hertford NC and Petersburg VA]. One race a year at Norwalk Ohio where the air really sucked both times I have been there. Is there an 'App" any of you guys have used that charts Jetting Changes vs DA [provided I can gather this information from a better equipped racer]?
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DA vs Jetting Calculator App
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DA vs Jetting Calculator App
73 Omega, 468 BBO, 4.185 ICON Pistons,RR/Wenzler Heads with HS 1.7 rockers and PAC 1220X Springs,J&S 5-main Halo with Billet Caps, .590I .580E 242I 256E HR Cam, 1000hp Carb,2" x 3 1/2" headers,Coan 2900rpm Conv.,TH400,3.73 12 bolt,11.32/118
Re: DA vs Jetting Calculator App
You don't really need a weather station if you have a smart phone. If there is an airport in the same general area as the drag strip then you are in good shape since airports typically publish an hourly weather station report on their website.
As for jetting and weather changes you can find plenty of info on that via Google. You most likely do not need to change the jets at all unless the weather change is dramatic. Standard rule of thumb is one jet size for 2000 ft change of elevation but it is rare to see a change that big unless you traveling a lot. Carbs do a pretty good job of self adjusting although they do have trouble with really large changes in elevation.
As for jetting and weather changes you can find plenty of info on that via Google. You most likely do not need to change the jets at all unless the weather change is dramatic. Standard rule of thumb is one jet size for 2000 ft change of elevation but it is rare to see a change that big unless you traveling a lot. Carbs do a pretty good job of self adjusting although they do have trouble with really large changes in elevation.
Andy F.
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Re: DA vs Jetting Calculator App
if you want to lean out a AFB carb just pull out the metering rod springs. I got call one day from customer who was at high altitude track and said he needed to lean out but had no jets so I told him to do what I just posted and he cleaned house that day.