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Old 08-19-2017, 09:11 PM   #71
HP HUNTER
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Default Re: 1971 Buick 455 GS F/SA G/SA Build

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Originally Posted by chris ok View Post
Congrats on your hard work paying off. Nice power. Small valve low compression engine. I look forward to hearing about testing now.
Chris
Thanks, I have tested Aug 19. In F/SA trim I ran 11.40 with zero tuning at Pueblo Colorado 4800 feet elevation, 25.10 baro, 7240 DA, .9508 correction, running the Turbo 400 with 4.10 gears. My next change is testing different carbs, a metric trans and 4.30 gears along with a rear end redesign. I really wish I had the time to really get after this combination I think it could really run.

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Old 08-19-2017, 11:00 PM   #72
Mark Yacavone
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Default Re: 1971 Buick 455 GS F/SA G/SA Build

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Thanks, I have tested Aug 19. In F/SA trim I ran 11.40 with zero tuning at Pueblo Colorado 4800 feet elevation, 25.10 baro, 7240 DA, .9508 correction, running the Turbo 400 with 4.10 gears. My next change is testing different carbs, a metric trans and 4.30 gears along with a rear end redesign. I really wish I had the time to really get after this combination I think it could really run.
You ran 11.40 actual et? What is the index at that altitude then?
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Old 08-20-2017, 09:23 AM   #73
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Default Re: 1971 Buick 455 GS F/SA G/SA Build

The index at Denver for F is 12:60 would have been #1 qualifier at the last national with that run.
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Old 08-20-2017, 09:56 AM   #74
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Default Re: 1971 Buick 455 GS F/SA G/SA Build

The F/SA index for Pueblo should be around 12.46 a run of 1.06 under at altitude is very impressive!
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Old 08-20-2017, 10:26 AM   #75
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Default Re: 1971 Buick 455 GS F/SA G/SA Build

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The index at Denver for F is 12:60 would have been #1 qualifier at the last national with that run.
Pueblo is about 1000 feet lower than Bandimere, but I'am sure I can run 11.60s there.
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Old 08-20-2017, 10:27 AM   #76
chris ok
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Default Re: 1971 Buick 455 GS F/SA G/SA Build

Great news
I know finding time is key
Same here working on my velle and GS too.
Better get outside now.
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Old 08-20-2017, 10:42 AM   #77
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Default Re: 1971 Buick 455 GS F/SA G/SA Build

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You ran 11.40 actual et? What is the index at that altitude then?
Call me..Can't find your number ..Have an unrelated question for you.
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I don't know the index in F for Pueblo, although the NHRA correction is .9508. 11.4 X .9508 = 10.84 not earth shattering.....but I'am just getting started. Stay tuned.
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Old 08-20-2017, 12:36 PM   #78
Dwight Southerland
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Default Re: 1971 Buick 455 GS F/SA G/SA Build

11.40 / .9508 = 11.99
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Old 08-20-2017, 01:11 PM   #79
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Default Re: 1971 Buick 455 GS F/SA G/SA Build

Dwight,

Hunter was taking his run back to sea level with the .9508 factor. That's what that factor does. You divided instead of multiplying. As an example, the factored Index for Pueblo, 12.46 x .9508 gives you the sea level Index of 11.85.

Lots of people who aren't "altitude runners" get these factors all confused.

Jerry
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Old 08-20-2017, 09:42 PM   #80
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Default Re: 1971 Buick 455 GS F/SA G/SA Build

I thought the index was 11.40 and was translating to the altitude factor. If the uncorrected index is 11.85, then the altitude factor is 11.85 / .9508 = 12.46
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