Best shifting RPM?
06-11-2002, 06:43 PM
#5
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With the stock peanut cam and heads that can't flow past 4500rpm, I beat the most people shifting at 3500rpm. It might seem a bit low, but it brought the engine back into the torque peak.
06-11-2002, 10:50 PM
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Car: 88 Camaro SC
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teh best use your senses way is to let the engine pull through the rpm band (dont go past 5500 rpms at most) and concentrate on how the engine feels. When the engine stoppes pulling and the accel. drops off, your past the point where the power band peaks and begins falling off. Shift at the point right before the accel. seems to die off and you should be hitting your peak power output.
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06-12-2002, 10:49 AM
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Car: RS
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with the mods I have, first gear seems to pull good until 5000, then I shift at about 4600, and about 4600 again for third, I have an auto and very few mods, if you shift before 4000 I'd say that it is a waste of time
06-12-2002, 04:37 PM
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Originally posted by iroc22
With the stock peanut cam and heads that can't flow past 4500rpm, I beat the most people shifting at 3500rpm. It might seem a bit low, but it brought the engine back into the torque peak.
With the stock peanut cam and heads that can't flow past 4500rpm, I beat the most people shifting at 3500rpm. It might seem a bit low, but it brought the engine back into the torque peak.
Darrell
06-12-2002, 05:32 PM
#10
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Originally posted by DM91RS
What do you feel the best shift point is now with the new cam and heads?
Darrell
What do you feel the best shift point is now with the new cam and heads?
Darrell
06-12-2002, 06:41 PM
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Originally posted by iroc22
Well it doesn't have Ultimate TBI mods, AFPR or modded chip and I generally shift at 6000rpm because it seems the most comfortable. It will pull to 6500.
Well it doesn't have Ultimate TBI mods, AFPR or modded chip and I generally shift at 6000rpm because it seems the most comfortable. It will pull to 6500.
If I remember you still run the stock intake don't you?
06-12-2002, 10:03 PM
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this sounds like a butt dyno festival
i think we shoudl keep this to people who have track comparisons of what shift points worked for them.
my comparison worked out the same when my car was stock and when it was modded. it shifted itself around 4400-4500 for both shifts, when i shifted at 5000 for both shifts i ran 2.5-3 tenths quicker with a slightly higher mph, maybe 1mph.
later
tim
i think we shoudl keep this to people who have track comparisons of what shift points worked for them.
my comparison worked out the same when my car was stock and when it was modded. it shifted itself around 4400-4500 for both shifts, when i shifted at 5000 for both shifts i ran 2.5-3 tenths quicker with a slightly higher mph, maybe 1mph.
later
tim
06-12-2002, 10:41 PM
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with my old mods I ran a best of 15.854, shifting at 5000 then 5000 again, at about 4400 (second shift) I lost a tenth and a half
06-13-2002, 11:27 AM
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5600 is where my shift point is....don't know if that's what my tach is reading but it works for me. You want to go past your peak torque/power but before it nose dives (from not having strong enough springs and/or the lifter hydra-rev setup). If you've taken enough calculus you can understand the whole integral thing. You don't want to shift according to torque (that's more torque converter specific), you want to shift so that you've got the most area under your hp graph from when and where you shift to where it falls back down too.
Example: well I'm too tired, if you need me to show you visually just say so or else I'll asume you all understand what I'm talking about. nap time...zzzzzzzzzz
Example: well I'm too tired, if you need me to show you visually just say so or else I'll asume you all understand what I'm talking about. nap time...zzzzzzzzzz
06-13-2002, 05:33 PM
#17
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Hooray for area under graphs! Hooray for integrals! Hooray for Calc 1, 2, and 3!
I run about .1 faster when I let my engine spin to 5000, but I let it shift automatically for consistancy. Got an auto, minus well use it.
I run about .1 faster when I let my engine spin to 5000, but I let it shift automatically for consistancy. Got an auto, minus well use it.
06-13-2002, 06:42 PM
#18
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Originally posted by JPrevost
5600 is where my shift point is....don't know if that's what my tach is reading but it works for me. You want to go past your peak torque/power but before it nose dives (from not having strong enough springs and/or the lifter hydra-rev setup). If you've taken enough calculus you can understand the whole integral thing. You don't want to shift according to torque (that's more torque converter specific), you want to shift so that you've got the most area under your hp graph from when and where you shift to where it falls back down too.
Example: well I'm too tired, if you need me to show you visually just say so or else I'll asume you all understand what I'm talking about. nap time...zzzzzzzzzz
5600 is where my shift point is....don't know if that's what my tach is reading but it works for me. You want to go past your peak torque/power but before it nose dives (from not having strong enough springs and/or the lifter hydra-rev setup). If you've taken enough calculus you can understand the whole integral thing. You don't want to shift according to torque (that's more torque converter specific), you want to shift so that you've got the most area under your hp graph from when and where you shift to where it falls back down too.
Example: well I'm too tired, if you need me to show you visually just say so or else I'll asume you all understand what I'm talking about. nap time...zzzzzzzzzz
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