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  Altitude Sea Level to 4,000 ft what to do?

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Author Topic:   Altitude Sea Level to 4,000 ft what to do?
Glens67
Gearhead

Posts: 325
From: Petaluma
Registered: Mar 2002

posted 09-22-2002 01:35 PM     Click Here to See the Profile for Glens67   Click Here to Email Glens67     Edit/Delete Message   Reply w/Quote
As a sea level racer, I have to figure what I need to do to run at 4,000 foot elevation at Top Gun in Fallon Nevada. Some of the team suggest dropping 4 jet sizes on the 750 DP. But do I change the Timing also? Timing now set at 14 Inital with 24 in the Mallory Unilite. crane HI 6 spark box. 67 390 GT mustang 4 Speed 350 Rear Crane CCH-296-2 cam 234/238 @ 50 112 .554/.563, Edl RPM intake, Edl RPM Heads, Hooker Super Comps, 2 1/2" 2 Chamber Flows.


Glens67

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Glen
67 GT 390
65 Galaxie 500 XL 4 Speed
It was not a Red Light they gave me a Slow Tree

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Moneymaker
Administrator

Posts: 19704
From: Lyons, IL, USA
Registered: May 99

posted 09-22-2002 05:30 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
First and foremost, if you can swap in a bigger gear to say a 3.89 or a 4.11 that would help more than any tune up in high elevation.
As far as the tune up goes, FE's like a lot of timing so I would bump it to 40 total.
I would only drop the jet a size or two, and I would not do that until I actually got to the track and measured the conditions.

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Alex Denysenko
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steve'66
Gearhead

Posts: 6522
From: Sonoma,CA,USA
Registered: Mar 2000

posted 09-22-2002 06:47 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Glen,

We've seen close to 4000' d/a this summer at Infineon. It may not be much different in the dry fall desert air in Fallon. But then again it could be 8000' too.

When I used to live in Reno I learned that you can run more timing and lower octane fuel in the thin air. A combo of all three (leaner jetting) may be in order, but they won't bring the power back.

SteveW

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Glens67
Gearhead

Posts: 325
From: Petaluma
Registered: Mar 2002

posted 09-22-2002 09:31 PM     Click Here to See the Profile for Glens67   Click Here to Email Glens67     Edit/Delete Message   Reply w/Quote
Good info, I'M learning

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Glen
67 GT 390
65 Galaxie 500 XL 4 Speed
It was not a Red Light they gave me a Slow Tree

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ASTIKHOSSW
Journeyman

Posts: 88
From: UPLAND CA SAN BERNARDINO
Registered: Sep 2000

posted 09-22-2002 11:54 PM     Click Here to See the Profile for ASTIKHOSSW   Click Here to Email ASTIKHOSSW     Edit/Delete Message   Reply w/Quote
Hi glens67 i was at palmdale this past saturday at the fun ford day and i normally run in the low 13.50. but i took the advice of one my stocker buddies,he told me raise my timing in my 428 cj to 42 degrees and jet the 735 down two jet sizes and a 4.56 GEAR.WELL ON SATURDAY I WENT 12.90 AT 105 MPH WHEN BEFORE I WOULD BE 100 MPH so the changes helped alot.

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