Re: calculating peak rpm hp
[Re: B3422W5]
#2536864
08/15/18 07:31 PM
08/15/18 07:31 PM
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Joined: Feb 2005
Posts: 20,116 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,116
PA.
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For sure, but thought i might try short shifting at 6000 to start. Then 6500 and go from there. Any such way like that will ultimately find out what i likes best. Love ya man, but frankly you make things more involved and harder than anybody that has ever posted on here... lol WOW 😮. That wasn’t a very cool thing to post. LOL.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: calculating peak rpm hp
[Re: mopar dave]
#2536868
08/15/18 07:36 PM
08/15/18 07:36 PM
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Joined: Mar 2009
Posts: 2,457 Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,457
Sydney,Australia
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nothing wrong with checking others opinion/experience , if only to confirm you are heading in the right direction .
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: calculating peak rpm hp
[Re: mopar dave]
#2537050
08/16/18 08:55 AM
08/16/18 08:55 AM
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Joined: Jan 2005
Posts: 4,243 Charlotte, North Carolina
sgcuda
master
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master
Joined: Jan 2005
Posts: 4,243
Charlotte, North Carolina
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Ask any questions you like. That's how we all learn. There are never stupid questions, only stupid people. Lol! Some people on here make comments about the repetition of questions. Sometimes we forget that people come and go off of this site all of the time. What people need answers to aren't in the first couple of pages listed and we all know too well how wonderful the SEARCH function works on here. My old combo with a 262/266 lift on my 440 liked a 6,800 rpm shift point. Car would slow down with a 6,500 or 7,000 shift. You'll find the sweet spot real quick.
Last edited by sgcuda; 08/16/18 08:55 AM.
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Re: calculating peak rpm hp
[Re: mopar dave]
#2537060
08/16/18 09:57 AM
08/16/18 09:57 AM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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FWIW once you establish your shift speed, you may want to try changing RPM for just one gear. For example, you may be able to run the 2-3 shift out a bit more than the 1-2 shift. Or it could be the opposite. It's not always that the engine wants to be shifted at the same RPM at every shift change.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: calculating peak rpm hp
[Re: mopar dave]
#2537104
08/16/18 12:02 PM
08/16/18 12:02 PM
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Joined: Oct 2007
Posts: 4,205 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,205
New York
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you may want to try changing RPM for just one gear. For example, you may be able to run the 2-3 shift out a bit more than the 1-2 shift. Or it could be the opposite. It's not always that the engine wants to be shifted at the same RPM at every shift change.
This^^^ All modern transmission have "ratio progression" in which the RPM % drop on shift is widest on the 1-2, and closes up as you reach final drive.
Boffin Emeritus
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Re: calculating peak rpm hp
[Re: madscientist]
#2537220
08/16/18 03:36 PM
08/16/18 03:36 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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FWIW once you establish your shift speed, you may want to try changing RPM for just one gear. For example, you may be able to run the 2-3 shift out a bit more than the 1-2 shift. Or it could be the opposite. It's not always that the engine wants to be shifted at the same RPM at every shift change. A couple of Stock Eliminator people I know shift their 1-2 200-300 RPM lower than their 2-3. Never tried it on my junk, simply cuz I position the tach "straight up" at the RPM where I shift for easy reference. Also, I don't use a shift light any more; I was always late on the shift when waiting for the light at the specified RPM. I'm more consistent w/ the approach above. Regardless, I was never aware of any major shift lag time that caused my actual shifts' RPMs to be so much higher like some of you said. I'd like some type of data logger or playback tach to see what's happening across the whole pass, though.
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Re: calculating peak rpm hp
[Re: BradH]
#2537228
08/16/18 03:41 PM
08/16/18 03:41 PM
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Joined: Feb 2005
Posts: 20,116 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,116
PA.
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A powerglide kinda simplifies this option
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: calculating peak rpm hp
[Re: mopar dave]
#2537290
08/16/18 05:43 PM
08/16/18 05:43 PM
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Joined: Oct 2007
Posts: 4,205 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,205
New York
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You may also see different converter slippage on different shifts: the 1-2 has more torque, but the 3-4 is against higher load. Once you find what works for you, the reason sort of matters less...
Boffin Emeritus
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Re: calculating peak rpm hp
[Re: mopar dave]
#2537334
08/16/18 07:17 PM
08/16/18 07:17 PM
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Joined: Jan 2003
Posts: 7,471 Minnesota
Hemi_Joel
master
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master
Joined: Jan 2003
Posts: 7,471
Minnesota
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At the pure stock drags, where you weren't allowd to add a tach, they use to say "when the fender starts to lay down, SHIFT"
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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