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Off Topic Off Topic - General non-Corvette related discussion. |
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03-07-2023, 3:46pm | #21 | ||||||
Chief Electrician
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Scott, I have loved that GTO since the first picture you posted and it just keeps getting better !
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03-07-2023, 5:28pm | #22 | ||||||
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I've got you covered. Only mine has about 400 HP less at the rear wheels than the OP's hardtop. Can't have everything!
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03-07-2023, 5:31pm | #23 | |||||||
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03-07-2023, 5:52pm | #24 | ||||||
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Here's my old girl.
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03-07-2023, 5:57pm | #25 | ||||||
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03-07-2023, 6:10pm | #26 | |||||||
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Scott
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03-07-2023, 6:33pm | #27 | ||||||
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03-08-2023, 12:01pm | #28 | ||||||
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That's a beautiful '64 Jeff78! It's amazing how good they look with the right wheels (not 20") and original steering wheel, etc. That car is badass all the way.
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03-08-2023, 12:43pm | #29 | |||||||
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If it's lean or a bit lean I would VERIFY with the mfg. that the fuel pump is capable of pumping enough fuel to prevent it going into a lean condition. Lean can melt pistons and rings....I would err on the side of rich vs lean. |
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03-08-2023, 12:46pm | #30 | |||||||
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03-08-2023, 3:31pm | #31 | |||||||
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The tuner set it up to run leaner at that range and I forget why. At any rate, the pump is making enough pressure to provide adequate fuel at WOT (7200 rpm) I don't think this is a pump issue though I know guys that have run boost-a-pumps but they are usually making 1000+ hp and running FI above 15 psi. Scott
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03-08-2023, 3:35pm | #32 | |||||||
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It's a fine line because the stock wheels make it look a bit like a toy with fat/sloppy sidewalls. I went with 18" all the way around and still have good sidewall section in a rim that echoed the old torq thrust wheels. Scott I have the original Rally wheels in their boxes but the orig owner put these on instead. With the the 18s
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03-08-2023, 3:36pm | #33 | ||||||
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03-08-2023, 3:59pm | #34 | |||||||
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Do you have an economy tune and a beast mode tune? Or other tunes saved? And does it do the same thing in all of them? |
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03-08-2023, 4:07pm | #35 | |||||||
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It's got gobs of power but that damn stumble around the 3500 rpm range (only under WOT) is maddening. As soon as it revs above to 4k + it pulls all the way to redline. Scott
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03-08-2023, 7:34pm | #36 | |||||||
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I think someone needs to plug a scan tool into it and go to live data and a test drive. Watching the fuel pressure, injectors, timing, etc...with live data and driving it. |
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03-08-2023, 8:00pm | #37 | |||||||
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He did tune it to be fairly conservative at lower RPMs and at higher revs, it really dumps fuel as needed. I can get 22 with it on the highway if I keep it under 75. Not too damn bad for a non-aero, 3400 lb brick. Scott
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03-09-2023, 12:50pm | #38 | |||||||
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Seriously, as for slightly lean at cruise/low rpm, the tuner likely has it set for maximum economy, which you are experiencing at 22 mpg. If you tip into the throttle at cruise, it will go rich as intended and off you will go. My '67 gets almost as good economy, but with a stock-de-tuned original engine, running the original distributor and points distributor. My secret is a 2.56 posi I installed out back. I get 21 mpg at a solid 75-80 mph and it cruises 91mph at 3000 rpm. It gets better MPG than my Tundra pickup! |
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03-09-2023, 4:17pm | #39 | ||||||
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Love it!!
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03-09-2023, 8:09pm | #40 | |||||||
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I've spent 35+ years turning wrenches and building street/strip cars. I sold the last race purposed toy and wanted a nice street cruiser with some extra punch when desired. Ports are 285 cc (11.5:1 comp) Cam: 248/260 .65/.655 111 LSA This is why I figured I was getting cam surge initially but after a retune it was still there. Any mileage I get is coming from the 6 speed trans (T56 super mag) final drive is .63 At 80 I'm ~2400 rpm Scott
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