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#1
12-28-2019, 03:12 PM
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Time difference with elevation change
So what kind of a ET difference would there typically be when running at 4300 feet in elevation then going to sea level? Thanks
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 1967 GTO, 467 roller motor, e heads ported, tremec T56 magnum 6 speed and 9" done. EZ EFI 2.0 with FAST dual sync distributor and separate nitrous system done. Track is at 4300 ft elevation. so far a best of 11.95@116. Suspension now getting dialed in...tubular front a arms with dual adjustable coil overs HR Parts n stuff rear bar and whole car lowered 3 inches.. |
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#2
12-28-2019, 03:24 PM
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#3
12-28-2019, 03:26 PM
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From the Wallace Racing site 11.95/116 at 4300 equates to 11.51/120.44 at sea level.
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 466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2 373 gears 3200 Continental Convertor best et 10.679/127.5/1.533 60ft 308 gears best et 10.76/125.64/1.5471 |
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#4
12-28-2019, 07:05 PM
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Quote:
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1967 GTO, 467 roller motor, e heads ported, tremec T56 magnum 6 speed and 9" done. EZ EFI 2.0 with FAST dual sync distributor and separate nitrous system done. Track is at 4300 ft elevation. so far a best of 11.95@116. Suspension now getting dialed in...tubular front a arms with dual adjustable coil overs HR Parts n stuff rear bar and whole car lowered 3 inches.. |
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#5
12-31-2019, 06:15 AM
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The dragtimes calculator using stock or mildly modified engines has been more accurate and predictable for https://www.dragtimes.com/da-density...ect+ET+and+MPH
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68 GTO,3860# Stock Original 400/M-20 Muncie,3.55’s 13.86 @ 100 Old combo: 462 10.75 CR,,SD 330CFM Round Port E's,Old Faithful cam,Jim Hand Continental,3.42's. 1968 Pontiac GTO : 11.114 @ 120.130 MPH New combo: 517 MR-1,10.8 CR,SD 350CFM E's,QFT 950/Northwind,246/252 HR,9.5” 4000 stall,3.42's 636HP/654TQ 1.452 10.603 @ 125.09 http://www.dragtimes.com/Pontiac-GTO...lip-31594.html |
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#6
12-31-2019, 09:19 AM
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#7
12-31-2019, 11:53 AM
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I wish I was racing down at 4300 LOL.
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 Johnny US Army Retired1978 T/A 463 Pontiac, KRE 74cc 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph 1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car. 1980 Formula 350 Pontiac back burner project 1972 LeMans 350 Pontiac |
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#8
12-31-2019, 12:17 PM
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There is a lot more to it than just the DA
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#9
01-01-2020, 01:52 AM
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Quote:
Depends a lot on how much you can compensate. For instance, a power-adder engine could be tuned to totally compensate. And- for a fast machine the thin air creates less aero drag.
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) |
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#10
01-03-2020, 02:38 PM
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[QUOTE=pokey1;6095022]So what kind of a ET difference would there typically be when running at 4300 feet in elevation then going to sea level? Thanks[/QUOTE
Your very basic question references an elevation change only. My very basic answer will assume similar atmospheric conditions at the two elevations, thus meaning the elevation change will result in a similar change in Density Altitude (DA). My experience has shown about a tenth of a second ET change for every 1000’ in DA change. A 4K change will require a tune-up (jet) change as well. So, if you were to rejet, you will pick up about four tenths.
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1969 Firebird, Tx3-455/468 machined by CVMS E-heads by Dave Wilcox/Comp Cams 300B-6 flat solid 850DP on E-85 by Eric Niefert/T2 1" plastic spacer T-400/PTC 4000/390's/30x9 Hoosier radial slicks,#3400 1.38 60' 6.32 @ 108 MPH at Northeast Dragway NC 5/23/15 (9th pass on new engine) https://m.youtube.com/watch?v=ePCu2v...ature=youtu.be 1.37 60' 6.26 @ 109 half track, 9.86 @ 136 1/4 mile, #3350 11/26/16 at Richmond Dragway (125th pass on new engine) |
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