auto or manual
Post Fiend
Joined: Jul 2003
Posts: 11,945
Likes: 3
From: Spokane, WA
Originally Posted by Saurian
I still look at it as an automatic is gonna zap 20% or so power...while the manual zaps about 10%. How far off base is this?
Post Fiend
Joined: Nov 2001
Posts: 5,871
Likes: 0
From: Coutts Canada
Less you forget that the rotating mass (all the gears and such) inside a manual provide the same effect a flywheel does with cintifugle (now i know thats not spelt right)force, and this gives some benefit when shifting through transfer of motion (now and i'm getting to technical here?),
Last edited by mustange70; Mar 22, 2005 at 04:06 PM.
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
ok, ok I am still looking, so far I found one site that showed approx hp losses stating manuals at 15-17%, and autos at 20-25, and he compared a C6 behind a small block ford, against a muncie 4spd behind a 455 buick not exactly a fair test in my world, and not even same class of trannies. he did mention that in a manual they loose an additional 4% when in any gear that is not 1:1. but I will keep looking for the one I mentioned earlier.
Logistics Pro
Joined: Jan 2002
Posts: 3,739
Likes: 3
From: GANS
I guarantee when pro dumped the clutch, the shaft snapped as a result of it.
Autos have a fluid coupling. While it is pretty stiff, it will absorb a lot of shock.. Almost like a shock absorber. Manuals, however, transmits the rest of the shock it doesn't absorb itself. (through the bearings, etc).
Autos have a fluid coupling. While it is pretty stiff, it will absorb a lot of shock.. Almost like a shock absorber. Manuals, however, transmits the rest of the shock it doesn't absorb itself. (through the bearings, etc).
Senior User
Joined: Nov 2003
Posts: 495
Likes: 0
From: WA
Check out this link on the efficiency of a manual versus an automatic.
http://www.eng-tips.com/viewthread.cfm?qid=81815&page=4
This is an engineering site with very good information in technical terms and reputable engineers. This site is strictly run by engineers for engineers.
Realize that they are talking about newer tranny's and not the transmissions of our vintage.
http://www.eng-tips.com/viewthread.cfm?qid=81815&page=4
This is an engineering site with very good information in technical terms and reputable engineers. This site is strictly run by engineers for engineers.
Realize that they are talking about newer tranny's and not the transmissions of our vintage.
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
I looked at that site too, but figured that it didn't show transmissions that were possibly bieng used by anyone on this forum in thier trucks, plus had some pretty technical stuff but not any real dyno tests. but it does have some good info. Please note I never said that manuals were worse than autos only that they weren't totally free of parasitic loss like some are claiming, and looking at both this site,and others using the low figure I found on one site as 15% for a manual that would mean Pro's 612hp would be loosing approx 92hp through his tranny, and even if you drop that to 5% that is still over 30hp.
Senior User
Joined: Nov 2003
Posts: 495
Likes: 0
From: WA
I agree with your figures above. If he was running an automatic with say a 20% frictional loss it would be about a 122 Hp loss within the tranny not to mention the parasitic losses through rest of the drivetrain. A 25% loss would equate to a 153 Hp loss. So were talking about 30 Hp - 60 Hp difference between the auto versus the stick. People buy headers just to find 20 to 25 Hp so its not that insignificant but, I agree its not the end of the world either. The flywheel also has power robbing issues as well and can be decreased by running a billet flywheel or shaving it which isn't good for durability issues. One other consideration is that the manual tranny is a bit lighter than the auto. I don't have the figures right off hand but I will find them and report back.
Last edited by highboy 74; Mar 22, 2005 at 06:37 PM.
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Posting Guru
Joined: Dec 2003
Posts: 2,155
Likes: 3
From: Centerville, Iowa
But in 4-wheeling wouldn't you want the heavier flywheel? In an all-out race application I'd say light is right, but for 4-wheeling and trucks don't you want a ground-pounder of a flywheel?
Post Fiend
Joined: Sep 2000
Posts: 8,238
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From: Oregon
A billet flywheel as all the strength and durability you need. I put one in last year, but that was mostly to reduce the chance of losing my legs in an explosion...I have no idea what the weight differences are.
Elder User
Joined: Sep 2000
Posts: 936
Likes: 0
From: Bay area
Originally Posted by bremen242
manuals are cool, but granny gear manuals have a reverse as low as the granny first, which sucks if you are trying to clean your tires out when backing out of a mud hole.
mute point, shift into high range or rev the engine higher.
Logistics Pro
Joined: Jan 2002
Posts: 3,739
Likes: 3
From: GANS
Originally Posted by jopey
mute point, shift into high range or rev the engine higher.
the rev limiter in this truck is the 1bbl carb. it doesn't really flow enough to rev past 4k with a load.