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Author Topic:   Jetting changes for higher altitudes?
steve'66
Gearhead

Posts: 3653
From: Sonoma,CA,USA
Registered: Mar 2000

posted 09-26-2001 06:35 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Melissa will be racing in Las Vegas in a couple weeks. How many jet sizes smaller should we put in the 750 holley. We use 83/88 at sea-level now. BTW Vegas is just over 2,000 feet elevation. Thanks guys!

SteveW

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Butch Jennings
Gearhead

Posts: 340
From: California
Registered: Apr 2000

posted 09-26-2001 08:24 PM     Click Here to See the Profile for Butch Jennings   Click Here to Email Butch Jennings     Edit/Delete Message   Reply w/Quote

If it were me, I'd go 81/87 and put another degree of timing in it right off the trailer

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Butch
460 powered 1967 Comet Cyclone
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Butcher's Home Page
"Friends don't let friends drive Chevys"

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steve'66
Gearhead

Posts: 3653
From: Sonoma,CA,USA
Registered: Mar 2000

posted 09-27-2001 12:38 AM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Thanks Butch,

That's what I was thinking, about 2 sizes smaller and more timing. You know how the ET finals are, there won't be many practice runs.

SteveW

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steve'66
Gearhead

Posts: 3653
From: Sonoma,CA,USA
Registered: Mar 2000

posted 09-29-2001 11:27 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
If anyone is interested, Team Sacramento is advising their members to tune for 4000-5000 feet if the temp is above 90 in Vegas. They recomend 4 jet sizes smaller, lower octane fuel, more timing, and a "power adder" if your car needs the punch to launch. I remember talking to a few Vegas team racers last year (when it was at Sears Point) that couldn't believe how well their cars ran at our track. Most were about .6 seconds quicker here. I guess we're gonna run 13's for the finals.

SteveW

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Just Jim
Gearhead

Posts: 373
From: So Cal
Registered: Feb 2000

posted 09-30-2001 12:12 PM     Click Here to See the Profile for Just Jim     Edit/Delete Message   Reply w/Quote
Sounds like typical conditions for LACR. 2 jet sizes smaller should be OK,but I don't know why you would need lower octane fuel.

Just remember it's a bracket race and as long as the car is consistent don't worry if it isn't as fast as it could be.Good luck to Melissa.

------------------
"Just Falcon Around"
1962 Falcon 351W
1958 Morris Minor 289

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